Predicting the Weather With Clouds

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Being able to predict the weather by observing cloud formations is a skill that is

somewhat lost on us modern humans. Most of us can easily look at a cloud and

see the unicorn or ice cream cones, but very few of us can look at clouds and

see the approaching cold front.

Fortunately, being able to predict the weather is easier than one may think.

Follows is some helpful information to get you started. It will no doubt wow,

impress and keep you dry on your next family outting into the great outdoors.

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Step 1: Categorization

Clouds can easily be broken into four categories. These categories are high

clouds, middle clouds, low clouds and clouds with vertical growth.

Clouds are also identified by shape. Cumulus refers to a "heap" of clouds.

Stratus refers to clouds that are long and streaky. And nimbus refers to the

shape of "rain" because we all know what rain looks like.

Step 2: High Clouds

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2 of 20 2/27/2015 11:45 AM

High clouds form at 16,000 - 43,000 feet. Basically, these are the clouds that

you only encounter on the top of really high mountains or at the cruising altitude

of a jet airplane. Due to the extreme conditions at which they form, they tend to

be comprised primarily of ice crystals.

High clouds do not block sunlight.

High clouds include:

Cirrus

Cirrostratus

Cirrocumulus

Step 3: Cirrus

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3 of 20 2/27/2015 11:45 AM

Cirrus clouds are white wispy clouds that stretch across the sky. By all accounts,

cirrus clouds indicate fair weather in the immediate future. However, they can

also be an indication of a change in weather patterns within the next 24 hours

(most likely a change of pressure fronts).

By watching their movement and the direction in which the streaks are pointed,

you can get a sense of which direction the weather front is moving.

Step 4: Cirrostratus

Cirrostratus tend to be sheet-like and cover the whole sky. You can usually tend

to see the sun or moon through them. Their pressence usually indicates moist

weather within the next 12 - 24 hours.

Step 5: Cirrocumulus

Cirrocumulus clouds tend to be large groupings of white streaks that are

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4 of 20 2/27/2015 11:45 AM

sometimes seemingly neatly aligned. In most climates these mean fair weather

for the near future.

However, in the tropics, these clouds may indicate an approaching tropical storm

or hurricane (depending on the season).

Step 6: Middle Clouds

Middle clouds form at 6,500 to 23,000 feet. They are comprised of water, and, if

cold enough, ice.

Middle clouds often block sunlight, but not always.

Middle clouds consist of:

Altostratus

Altocumulus

Step 7: Altostratus

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5 of 20 2/27/2015 11:45 AM

Altostratus are grey and/or blue clouds that cover the whole sky. They tend to

indicate a storm some time in the very near future since they usually precede

inclimate weather.

Step 8: Altocumulus

Altocumulus are grayish-white clouds blanketing the entire sky. The tend to look

like large fluffy sheets in which there is a lot of contrast between light and dark.

Sun does not pass through them. If you see them in the morning, prepare for a

thunderstorm in the afternoon.

Step 9: Low clouds

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6 of 20 2/27/2015 11:45 AM

Low clouds form below 6,500 feet. These clouds are the ones that like to

hang-around just above tall buildings. These clouds tend to contain water, but

can also be comprised of snow if the weather gets cold enough.

Low clouds block sunlight and can bring precipitation and wind.

Low clouds include:

Stratus

Stratocumulus

Nimbostratus

Step 10: Stratus

Stratus are low-lying solid clouds that are often formed when fog lifts off the

ground. They obviously look like an elevated fog. Often they bring drizzle or light

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7 of 20 2/27/2015 11:45 AM

snow.

Step 11: Stratocumulus

Stratocumulus are low-lying bumpy and grey clouds. They do not bring

precipitation. They also do not cover the entire sky and tend to come in rows

and patches.

Step 12: Nimbostratus

Nimbostratus is your standard rain cloud. It is a large flat sheet of grey cloud

with a little bit of differentiation. If you see these, chances are it's raining outside.

Step 13: Clouds with vertical mobility

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8 of 20 2/27/2015 11:45 AM

And last, but not least, are clouds with vertical growth which tend to have a base

that hangs really low (5,000 feet) and a top that climbs really high (over 50,000

feet).

Clouds in this category include:

Cumulus

Cumulonimbus

Step 14: Cumulus

Cumulus clouds are your stereotypical white "cottonball" clouds. So long as the

clouds remain low clumps floating across the sky, there will be fair weather.

However, you need to keep an eye on these clouds because any vertical growth

can indicate the start of a large storm.

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Step 15: Cumulonimbus

Cumulonimbus are cumulus clowds that have grown vertically into an anvil-like

shape. The anvil tends to point in the direction the storm is moving. These

clouds bring most dangerous weather such as rain, lightning, hail and

tornadoes.

Step 16: That's a lot of information. Now what?

Alright, now that we know what the basic types of clouds are, we need to look up

at the sky.

Go outside and look at the sky. If there are no clouds in the the sky, then the

weather is fine.

Assuming there are clouds in the sky, we now need to identify them.

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10 of 20 2/27/2015 11:45 AM

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First, determine if you can see the sun or moon through them. If you can, then

you are looking at high altitude clouds. If the clouds are thick, then there is a

chance of poor weather a day or two in the future. To determine when the storm

will arrive, observe whether or not the clouds appear to be moving. If they

appear stationary, it is a slow moving front and probably won't arrive for over a

day. If they appear to be moving, then the change in weather will be there faster.

You can tell which way the storm is traveling by the direction the clouds are

pointing.

If you can not see through the clouds, chances are that you are looking at

middle or low altitude clouds. First, determine which of the two you are dealing

with by observing shape, color and other more obvious give-aways. Are they

covering the entire sky? Then they may be middle altitude clouds. Do they

appear to be grey with a blue tint or fluffy white/grey clouds with a lot of contrast

between light and dark? If yes, then these are middle altitude clouds and you

should prepare for rain within half a day.

If you answered no to any of those questions, then check for low-altitude clouds.

These tend to appear low and often engulf mountains and buildings. If it looks

like an elevated fog, expect drizzle (if it isn't already). If it is rows of low, dark,

lumpy clouds, then the weather is otherwise okay, but watch for further

developments. If there is a low, dark, grey sheet, then it's probably raining. If it's

not, quickly go get your umbrella.

If your clouds are low, fluffy, and white like cottonballs in the sky, then the

weather is okay. However, keep an eye on these for any vertical growth of the

cloud upwards into the sky (turning into anvil shapes). These clouds can

unexpectedly change from fair weather indicators into violent thunderstorms.

1-40 of

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cirrusb2002 (http://www.instructables.com/member/cirrusb2002/)

Excellent article, I've used it as a derivative to instruct

cadets on predicting weather patterns in the field, in

order to assist them with preparation for personal

equipment to take on field training.

Tuinopo80 (http://www.instructables.com/member/Tuinopo80/)

Nice! Good Preparation for hiking in the mountains!


11 of 20 2/27/2015 11:45 AM


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ccerceni (http://www.instructables.com/member/ccerceni/)

Quite resourceful and interesting. Great job

dude keep up the good work.

weather2u (http://www.instructables.com/member/weather2u/)

Hey, I just want to say this information has helped me a lot. I am a Wando

Band Student, and during our marching band season, it is important to keep

an eye on the weather. I just wanted to ask a question though,

What if you see Alto Cumulus clouds in the mid-morning (around 10 or 11 AM

ish)? Does it still mean a chance for rain in the afternoon? Are they actually

Alto-Cumulus time? Please explain.

Thanks sooooo much for your time. I really appreciate it! :)

horselover101 (http://www.instructables.com/member/horselover101/)

Thanks for the information! I'm doing a science fair project

on Meterology and this is a really big help!

Woodbuffalo (http://www.instructables.com/member/Woodbuffalo/)

put together very well, simple and understandable, Thank

You. In regards to WIND that is a whole new ball

game...there is a morning wind (east to west, generally

cooler as the mtns draw from the low lands) From approx

2-3pm there is "dead air" (the hottest part of the day) From

3pm into late evening is the warmer winds (west to east),

most times bringing wet weather.

Rishnai (http://www.instructables.com/member/Rishnai/)

Stratocumulus also tend to mean a storm will probably happen somehwere

near(ish) that day. If you see them meeting with another cloud formation, such

as nimbostratus. If you see nimbostratus clouds stop in a vey distinct line, and

stratocumulus meeting, crossing, or coming near that line, plan for an indoor

day with the possibility of severe weather directly to your north, south, or

above you that day. In some cases, you will be able to watch a potentially

severe stack go up over or just to the east of you, in which case someone

about 100-250 miles to the east of you is about to have a bad day. At least

that's what happens here, on the very western edge of tornado country. Many

days, I can look up at the sky and predict (not well enough to become a pro

stormchaser, unfortunately) whether severe weather will happen, and predict

where it will be, such as "That sucker's going to do something nasty (tornado

or bad hail) over at about I-76 and the state line." Or "From the looks of that,

Peyton/Calhan is in danger today. We oughta call Sue and Bud, make sure

they're alright in about four hours." For a while I could get people to bet me on

that, then we'd sit around watching the weather radar and let the money

change hands.

static (http://www.instructables.com/member/static/) Rishnai

Actually the pros don't observe clouds in making

their morning decision as to where they will go that

day. They can't because there destination may be a

State away, when they start the chase. Of course

they use cloud observations to fine tune the chase if

their morning prediction was accurate. Sometimes


12 of 20 2/27/2015 11:45 AM


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they are good or lucky, perhaps both. I recall a Sunday when Chasers from

Oklahoma where in NW Kansas waiting when a tornado formed. The NWS

even hadn't even issued a tornado watch for that day. :)

Rishnai (http://www.instructables.com/member/Rishnai/) static

Yeah, I wish cloud-watching alone would make it

possible to tell where a tornado might be, in time to

get near there. If it was possible to predict clouds

well enough by eye to go pro, I'd want to develop

that skill. But as it is, I have to wait for a cell to start,

and then do the judgment call: go for the north one,

or the south one? Any cloud-watcher does, but if I

wanted to see a twister, I'd be in the wrong spot to

get near it in time. I like it that way. It's just that all

the severe weather rolls off of the front range, so if

something is going to hit the west 1/4 of

Kanses/Nebraska, or any part of CO, I get to watch

it form before it goes off somewhere past the

horizon to forcibly remodel someone's home.

vincent7520 (http://www.instructables.com/member/vincent7520/) Rishnai

However I must add to my previous reply that your

remarks confirm what I want to say :

1) your "expertise" in forecasting is local and is

based on multiple factors starting with a good

knowledge of local factors that was built over the

years ;

2) TV weather forecast and other pro weathermen

are on th whole very reliable, albeit some rare

mistakes of course.

Actually your remark are very useful as you give

practical examples to what I say on a more general

level.

Thank you & Happy New Year to you an all your

relatives (I know this is important in your country).

vincent7520 (http://www.instructables.com/member/vincent7520/) Rishnai

@ static and rishnal :

I didn't feel that Randolfo wants to use his cloud

reading for tornado forecast

I think he writes on a more general level.

As for myself, although I feel I have a proper overall

notion of weather forecasting, as I live in a land

were tornadoes do not exist (God forbids !) in no

way would I allow myself to forecast a tornado in

one of your states.

This would be totally preposterous and ridiculous

!!!

MaXoR (http://www.instructables.com/member/MaXoR/) static

You watched storm chasers too?!?! lol

killerAP (http://www.instructables.com/member/killerAP/) static


13 of 20 2/27/2015 11:45 AM

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bs man. The weather men ALWAYS

just take a look at the clouds in

order to predict the weather. One

time here in NJ they said it would be

clear for a while, and then thirty

minutes later we got hail.

Rishnai (http://www.instructables.com/member/Rishnai/) killerAP

I guess the point that we are both trying to make is

that you can predict if the location you are at is

about to get something, (unless you're a TV

weatherman) but you can't just look at the clouds

and know precisely what county a state and a half

away is going to get a tornado. At least not in time

to get there before the storms fire up and drop the

tornado that you want to film. Storm chasers pick

where they're going that day at or before ten in the

morning, so that they can be there when the storm

happens at three in the afternoon. People who like

to watch clouds (and local weathercasters), on the

other hand, can theoretically look at the sky at ten

and tell what weather that spot is going to get at

three. Except the weathercasters. I think they snort

a line and flip a coin sometimes.

dmwarheit (http://www.instructables.com/member/dmwarheit/) Rishnai

Nimbostratus clouds are more associated with

occluded fronts and long duration constant rainfall

that severe weather. If you are seeing low lying

thick dark clouds that have a swirl appearance to

them you are probably looking at the base of a

meso-cyclone. Basically they are a conglomerate of

thunderstorms with enough energy to create its

own counter clockwise rotation. While

stratocumulus can be associated with inclement

weather, they are more often caused simply by a

mid level, 5-10k, temperature inversion that blocks

the cumulus' vertical movement. When the cumulus

can no longer going up they start to spread into

stratocumulus. Hope this helped. :o)

gordokury (http://www.instructables.com/member/gordokury/)

what do you predict when you see a chemtrail?

randofo (http://www.instructables.com/member/randofo/) (author)

gordokury

Paranoia.

gordokury (http://www.instructables.com/member/gordokury/) randofo

hahaha, ok, but, remember, the worst think about

paranoids is that they are right


14 of 20 2/27/2015 11:45 AM


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vincent7520 (http://www.instructables.com/member/vincent7520/)

gordokury

Nope Paranoia is overinterpretation.

It a sickness that makes a conglomerates of various facts and draw the

wrong conclusion

Okay, that's not the subject here

Zinky (http://www.instructables.com/member/Zinky/) gordokury

CHemtrails often indicate strong reptilian influence,

many long /straight/ looking lines and 90 degree

angles, indicates strong reptilian influence, heavy

pollution and or mind/behavior control. 60 degree

angles are much nicer :-) -ps i know the earth is

round and that straight lines and angles work a little

differently then on a flat earth.

emartian (http://www.instructables.com/member/emartian/)

Fantastic 'struct! I especially appreciate the quality of the photos; the three

people reading over my shoulder were all nodding silently in agreement. Any

idea where we could reliably see lenticular formations?

vincent7520 (http://www.instructables.com/member/vincent7520/) emartian

I saw one on the Mont Ventoux (1 000m) not latter

than dec. 16.

This is in the South of France.

Just luck I suppose

randofo (http://www.instructables.com/member/randofo/) (author) emartian

I left them out because they were more of an

anomaly or special case.

The wikipedia page seems pretty reasonable

though:

http://en.wikipedia.org/wiki/Lenticular_cloud

(http://en.wikipedia.org/wiki/Lenticular_cloud)


Nice instructable

but I'm not sure it is very practical as it seems too general

to me : practically you have to take into account local

patterns to really make the clouds "talk" and predict

weather : the sea, coast line, mountain formation, plain and

type of plants or trees plus local idiosyncrasies may

change considerably the general pattern you give here.

Your description of clouds is 100% correct of course but in

order to have a valuable prediction type of clouds must be

crossed with other informations :

- locally, air pressure with rate of rise or fall, wind speed

and direction at ground level (which is somewhat easy) and

at higher altitude (as you say) which can only be a guess,

temperature rise or fall

- if possible) regionally or on 1/2 a continent scale (let's say

Eastern US or Western Europe) data from different

weather stations ; ie. (for each station) air pressure, rate of


15 of 20 2/27/2015 11:45 AM


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barometer rise of fall, wind direction and speed, temperature with rise or fall plus

type of cloud formation, type of rain if any, fog formation and dew point.

This list seems pretty stuffy, but once you're used to it you can make good

valuable 24h predictions by drawing a chart of air masses, fronts and weather

formation on the whole area (1/2 a continent).

We did precisely that when sailing on the western coast of Europe using the

weather service from BBC's channel 4. This weather bulletin was broadcasted 6

times a day (if my memory serves me well) and we did draw a weather chart in

about 5 minutes after the broadcast.

Of course with the internet on board, Navtex and all those electronic devices

(which are truly invaluable in rough conditions) caring about the weather has

changed dramatically : a 72 hours forecast in reliable now when a 12 hours

prediction was the more we could expect in the late 50's and 60's (24 to 36 hours

in the late 70's). And safety has increased and this is good

Conversely I feel we have lost an art of prediction which was trying to "read" all

those little signs from nature to make us aware of what could happen next and

gave a feeling of belonging to a universe we could have a practical understanding

of.

(Same could be said about the art of navigation, dead reckoning and nautical

astronomy : making a perfect fix by stars was -still is for some ?- quite exhalirating

and gave a feeling of deep achievement and a feeling of being one with one's

environment).

This is why your instructable is great albeit its limitations. Maybe you should add a

section on how the air masses move, how warm and cold fronts form what makes

the difference between a low and a high, wind direction, use of temperature rise

and fall, etc that shape the coming weather ? And also be somewhat more

specific about where and in which season the informations you give work best ?

It is just a suggestion

I am also aware this becomes a general course in meteorology and

Instructable.com may not be the place for it !!! ;D

So please don't feel I'm trying to put down your effort.

On the contrary.

Again, thank you and Happy New Year (as this is written on 12-30 at 11pm (local

time) :D :D

chazskinz (http://www.instructables.com/member/chazskinz/)

good idea, bad information!

it is ashamed to not include chemtrails (government papers confirm this) since

it is a FACT. to dismiss it as paranoia is not only ignorance of what is going on

in your skies but giving people biased and uninformed information.

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chazskinz

Cool off, man ! It's nearly New Year's Eve.

Moreover I do not see how chemtrails (wether tey are facts or not) can

help to predict weather which is the purpose of this instructable

You're just knocking at the wrong door.

Be nice to you : give yourself some fresh air and read what people

write instead of seeing a conspiracy where only simple useful facts are

given (not all facts but useful facts).


chazskinz

I haven't dismissed anything.

I have simple explained how to predict the weather using naturally

forming cloud formations. These originate from complex natural

processes as they have for billions of years.

There is no bias here. Only FACT.

MaXoR (http://www.instructables.com/member/MaXoR/) chazskinz

You know, I gotta say...... you sure come on really

strong when you have to make a point.

You realize that your chemtrails(Or maybe you

meant contrails?) only affected new york (most of

which was noted by airport monitoring equiptment,

and was largly localized to the airports because of

traffic being high enough there) by 5 degrees

celsius during the world trade center fiasco. (They

shut down air traffic for a few days after the towers

were hit)

Secondly this person was giving us examples of

judging weather, using globally forming cloud

patterns. Unless you live close to an airport,

contrails will never get dense enough to significantly

impact the local weather. If you do live close

enough, well.... looks like cloudy skys with higher

chances of precipitation when fronts move in.... as a

constant (Fluctuating mildly with traffic density)

However, I'm sure all of us here would love to hear

your forcast model using contrails?! I'm very

intrigued on how this relates to world weather, and

predicting weather using naturally forming clouds as

a result of moving fronts


17 of 20 2/27/2015 11:45 AM


/member

/iShouldaKnoDD/)

3 years ago Reply


/member

/piper1234/)

3 years ago Reply


/member

/finfan7/)

3 years ago Reply


/member

/stuilevuka/)

3 years ago Reply


/member

/teslacoilguitaramp%2Chelpmeplz/)

3 years ago Reply

Yes, contrails do affect tempurature, however they affect airports mostly,

and major airways/skyways. They also only hold moisture long enough to

dissipate back into the air around it. Contrails are not the "exhaust" of the

airplane persay.... it's a reaction with the tempurature difference of their

exhaust and the cold air. The hot moist exhaust air is combining with the

low vapor pressure cold air way up there. It's the same effect as when you

breath out on a cold day. So with that in mind, us as humans exhale way

more vapor than the jets do on average, and would then be the largest

factor in global weather change!

You made yourself look like a fenatic, and therfor no one will ever truthfully

listen to you with much regard. I know I sure didn't, but then again, I'm just

one opinion... maybe others have their own!

iShouldaKnoDD (http://www.instructables.com/member/iShouldaKnoDD/)

Wonderful!!! Without being negative, one question. How do

you propose to get anyone to leave their monitor & go

outside to look up??

I (am aged) grew up where tornadoes are angry & as a

child was repeatedly warned to "watch the clouds",,or else!

(I knew what that meant) My "mentors" also taught me to

note the behavior of animals & plants. as when the leaves

of trees turn over or pets get nervous.

Thank you so much for you time and knowledge & trouble

in posting this life saving information!!

piper1234 (http://www.instructables.com/member/piper1234/)

mm if you live in the tornado alley or in Florida or some wild rainy place on

earth this almost forgotten info might save lives, lately people trust in the tv

weather but if you look to the ancient wise knowledge of watching the sky and

judge by the clouds a tragedy could be avoided, if you see cumulosnimbus you

better run to hide, weather doesn't understand about satellites and tv

finfan7 (http://www.instructables.com/member/finfan7/)

This is an excellent resource. Living in the Southwest I see mostly dust clouds

but I will definitely start watching for these.

stuilevuka (http://www.instructables.com/member/stuilevuka/)

thanks for the useful information and one that is very important to us daily

teslacoilguitaramp,helpmeplz (http://www.instructables.com/member

/teslacoilguitaramp%2Chelpmeplz/)

i pretty much new all this stuff but it is still good to have a refresher, and a few

more facts too, i found a few flaws about the description outcomes being to

precise and strict, i have had very thick dark sheets of nimbostratus and never

received any rain, but though it usually does, not as i am typing this because i

have those clouds it is dry, though this is not an exact science.

thingygoboom (http://www.instructables.com/member/thingygoboom/)

A great instructable. Simply wonderful.

Someone should make an app to do it for us.


18 of 20 2/27/2015 11:45 AM

4 years ago Reply


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4 years ago Reply


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6 years ago Reply

We have a be nice comment policy.

Please be positive and constructive. I Made it! Add Images Make Comment


thingygoboom

There are plenty of apps that will predict the weather. The whole point

of this is to be able to do it yourself without an app.

sellulose (http://www.instructables.com/member/sellulose/)

I am unable to see this image. Please reload. Thanks.

randofo (http://www.instructables.com/member/randofo/) (author) sellulose

Works fine on all of my browsers. Try refreshing the

page.

Edward L (http://www.instructables.com/member/Edward+L/)

This instructable is great! Thanks for the great info.

msean (http://www.instructables.com/member/msean/)

Nice. Thank you.

blugyblug (http://www.instructables.com/member/blugyblug/)

Woww awesome instructable. IM gonna bookmark this.

what about no clouds? =DD

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19 of 20 2/27/2015 11:45 AM

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Documents

Predicting the Weather With Clouds