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MADISON’S CURRENT WEATHER. Madison Weather at 1000 AM CDT TUE AUG 7 2001 Updated twice an hour at :05 and :25 Sky/Weather: SUNNY Temperature: 85 F ( 29 C ) Dew Point: 76 F ( 24 C ) Relative Humidity: 74% Wind: VRB7 MPH Barometer: 30.13F. - PowerPoint PPT Presentation
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MADISON’S CURRENT WEATHERMADISON’S CURRENT WEATHER
Madison Weather at 1000 AM CDT TUE AUG 7 2001 Updated twice an hour at :05 and :25
Sky/Weather: SUNNY Temperature: 85 F (29 C) Dew Point: 76 F (24 C) Relative Humidity: 74% Wind: VRB7 MPH Barometer: 30.13F
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 33
Surface Weather Map from Today Surface Weather Map from Today with with IsobarsIsobars & Fronts & Fronts
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 44
Current Temperatures (Current Temperatures (ooF) & IsothermsF) & Isotherms
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 77
Current Winds Aloft at 34,000 Ft.Current Winds Aloft at 34,000 Ft.
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 1212
ATM OCN 100 - Spring 2002 ATM OCN 100 - Spring 2002 LECTURE 25 LECTURE 25 (con’t.)(con’t.)
MID-LATITUDE WEATHER SYSTEMS:MID-LATITUDE WEATHER SYSTEMS:PART II: THE EXTRATROPICAL CYCLONEPART II: THE EXTRATROPICAL CYCLONE
A.A. IntroductionIntroductionB.B. The Norwegian Model of Extratropical CyclonesThe Norwegian Model of Extratropical CyclonesC.C. Observed Weather Features surrounding Observed Weather Features surrounding
Extratropical CyclonesExtratropical CyclonesD.D. Life Cycle of an Extratropical CycloneLife Cycle of an Extratropical Cyclone
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3333
Life Cycle of an Extratropical CycloneLife Cycle of an Extratropical Cyclone See Fig. 11.9 Moran & Morgan (1997)See Fig. 11.9 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3434
Incipient Cyclone Stage in the Life Incipient Cyclone Stage in the Life Cycle of an Extratropical CycloneCycle of an Extratropical CycloneSee Fig. 11.9A Moran & Morgan (1997)See Fig. 11.9A Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3535
The Surface Low & the JetThe Surface Low & the Jet
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3636
Linkage between surface weather Linkage between surface weather systems & winds aloftsystems & winds aloft
See Fig. 10.22 Moran & Morgan (1997)See Fig. 10.22 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3737
Wave Cyclone Stage in the Life Cycle Wave Cyclone Stage in the Life Cycle of an Extratropical Cycloneof an Extratropical Cyclone
See Fig. 11.9B Moran & Morgan (1997)See Fig. 11.9B Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3838
Occluding Stage in the Life Cycle of an Occluding Stage in the Life Cycle of an Extratropical CycloneExtratropical Cyclone
See Fig. 11.9C Moran & Morgan (1997)See Fig. 11.9C Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 3939
Bent-Back Occlusion Stage in the Life Bent-Back Occlusion Stage in the Life Cycle of an Extratropical CycloneCycle of an Extratropical CycloneSee Fig. 11.9D Moran & Morgan (1997)See Fig. 11.9D Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4242
Cyclone Families from TIROSCyclone Families from TIROS
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4343
Occluded Cyclone over British Occluded Cyclone over British IslesIsles
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4545
E. MOVEMENTS OF EXTRATROPICAL E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONESWAVE CYCLONES
General MovementsGeneral Movements
– Steering winds aloftSteering winds aloft
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4646
Zonal Circulation RegimeZonal Circulation RegimeFigure 10.10 Moran & Morgan (1997)Figure 10.10 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4747
Meridional Circulation RegimeMeridional Circulation RegimeFigure 10.10 Moran & Morgan (1997)Figure 10.10 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4848
Stagnant Circulation Regime Stagnant Circulation Regime with with Cut-off Lows & Blocking HighsCut-off Lows & Blocking Highs
Figure 10.13 Moran & Morgan (1997)Figure 10.13 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 4949
E. MOVEMENTS OF EXTRATROPICAL E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES WAVE CYCLONES (con’t.)(con’t.)
General MovementsGeneral Movements Regions of CyclogenesisRegions of Cyclogenesis
– Lee-side of mountainsLee-side of mountains
– Along east coasts of continentsAlong east coasts of continents
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5050
Lee-slope CyclogenesisLee-slope CyclogenesisSee Fig.1 pg. 275, Moran & Morgan (1997)See Fig.1 pg. 275, Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5151
E. MOVEMENTS OF EXTRATROPICAL E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES WAVE CYCLONES (con’t.)(con’t.)
General MovementsGeneral Movements Regions of CyclogenesisRegions of Cyclogenesis
– Lee-side of mountainsLee-side of mountains
– Along east coasts of continentsAlong east coasts of continents Principal Cyclone Tracks overPrincipal Cyclone Tracks over
North America North America
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5353
Storm TracksStorm Tracks see Fig. 11.16 of Moran & Morgan (1997)see Fig. 11.16 of Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5454
E. MOVEMENTS OF EXTRATROPICAL E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES WAVE CYCLONES (con’t.)(con’t.)
General MovementsGeneral Movements Regions of CyclogenesisRegions of Cyclogenesis Principal Cyclone Tracks overPrincipal Cyclone Tracks over
North America North America Time Sequences of Weather Events -Time Sequences of Weather Events -
Single Point Forecasting Single Point Forecasting
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5555
Weather along Storm TracksWeather along Storm Tracks(A) Warm Side(A) Warm Side vs. vs. (B) Cold side (B) Cold side
see Fig. 11.15 of Moran & Morgan (1997)see Fig. 11.15 of Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 5656
Weather on Warm SideWeather on Warm Side
Windy, warm & rainy in Windy, warm & rainy in Madison Madison
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 6262
Weather on Cold SideWeather on Cold Side
Development of a 5 inch snow Development of a 5 inch snow storm in Madison (with storm in Madison (with
temperatures in the teens)temperatures in the teens)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 6767
Incipient Cyclone Stage in the Life Incipient Cyclone Stage in the Life Cycle of an Extratropical CycloneCycle of an Extratropical CycloneSee Fig. 11.9A Moran & Morgan (1997)See Fig. 11.9A Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 6868
Wave Cyclone Stage in the Life Cycle Wave Cyclone Stage in the Life Cycle of an Extratropical Cycloneof an Extratropical Cyclone
See Fig. 11.9B Moran & Morgan (1997)See Fig. 11.9B Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 6969
Occluding Stage in the Life Cycle of an Occluding Stage in the Life Cycle of an Extratropical CycloneExtratropical Cyclone
See Fig. 11.9C Moran & Morgan (1997)See Fig. 11.9C Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7070
Bent-Back Occlusion Stage in the Life Bent-Back Occlusion Stage in the Life Cycle of an Extratropical CycloneCycle of an Extratropical CycloneSee Fig. 11.9D Moran & Morgan (1997)See Fig. 11.9D Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7171
G. WINTER STORMSG. WINTER STORMS
DefinitionsDefinitions Winter Weather ConditionsWinter Weather Conditions
– Hazards of Winter StormsHazards of Winter Storms HEAVY SNOWHEAVY SNOW ICE STORMSICE STORMS STRONG WINDSSTRONG WINDS
– Ingredients of a Winter StormIngredients of a Winter Storm COLD AIRCOLD AIR MOISTUREMOISTURE LIFTLIFT
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7272
See Figure 11.14 Moran & Morgan (1997)See Figure 11.14 Moran & Morgan (1997)
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7373
WINTER STORMS WINTER STORMS (con’t.)(con’t.)
BlizzardsBlizzards
– Winter weather condition lastingWinter weather condition lasting 3 hours 3 hours oror more with: more with: Strong winds (35 mph or more);Strong winds (35 mph or more); Snow & blowing snowSnow & blowing snow
with visibility less than 1/4 mile. with visibility less than 1/4 mile.
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7474
WINTER STORMS WINTER STORMS (con’t.)(con’t.)
Public Information DisseminationPublic Information Dissemination & Public Safety Precautions & Public Safety Precautions
– Blizzard warnings;Blizzard warnings;
– Winter storm watches & warnings;Winter storm watches & warnings;
– Ice storm warnings;Ice storm warnings;
– High wind warnings;High wind warnings;
– Wind chill warnings.Wind chill warnings.
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7575
Cyclones along the Polar FrontCyclones along the Polar Front
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7676
Cross Section thru a cycloneCross Section thru a cyclone
ATM OCN 100 Summer 2002ATM OCN 100 Summer 2002 7777
An extratropical cycloneAn extratropical cyclone