SAAWSO HIGH IMPACT WEATHER EVENTS

Ismail GultepeEC, Cloud Physics and Severe Weather Research

SectionToronto, Ontario M3H 5T4, Canada

OBJECTIVES

• EMPHASIZE HIGH IMPACT WEATHER EVENTS

• -SURFACE OBSERVATIONS• -REMOTE SENSING OBSERVATIONS• -FORECAST MODELS• -INTEGRATED DATA

• FOCUS ON SATELLITE BASED ALGORITHMS AND NOWCASTING

HIGH IMPACT WEATHER EVENTS

• LOW VISIBILITY AND CEILING• HEAVY SNOW• FREEZING FOG, DRZ, AND RAIN• HEAVY RAIN AND DRIZZLE• STRONG GUST AND WIND SHEAR• SNOW SQUALLS

ANALYSIS ISSUES

• MEASUREMENT UNCERTAINTY-CALIBRATION -INSTRUMENT RESPONSE -THRESHOLDS

• ANALYSIS UNCERTAINTY

• TIME AND SPACE VARIABILITY

MAP FOR THE PROJECT REGION

BAY BULLS

FLATROCK

HOLYROOD ST. JOHN’S

IMPORTANT CASES FOR HIGH IMPACT WEATHER EVENTS

• Jan 10 [heavy snow: >50 cm/day]• Jan 17/18 [heavy snow, riming, splint.]• Jan 22 [heavy snow]• Jan23-26 [snow squalls/blowing snow]• Jan 31 [gust/IP/RN]• Feb 2 [heavy snow]• Feb 4[fog/DRZ]• Feb 20-22 [Icing event]• April 6 [heavy RN]• April 19 [wet snow, IP, rain, drizzle]

WINTER SNOW STORM

• MORE THAN 50 CM SNOW/DAY• 60% (350000 PEOPLE) DID NOT

HAVE ELECTRICITY• 4-7 DAYS NO ELECTRICITY• ALL THE FLIGHTS CANCELLED

DURING STORM

JAN 10 SNOW STORM

RADAR IMAGES

GOES IMAGES

JAN 10 2013-SNOW STORM

JAN-10/11 SNOW STORM

GCIP PARTICLE SHAPES

LPM MEASUREMENTSPWD MEASUREMENTS

January 10

WIND 3DApril 6

April 6

Jan 22 heavy snow case

JAN 17-NEEDLES-SPLINTERING

JAN 17-heavy riming

Particle shape

discrimination

JANUARY 24 SNOW SQUALLS

Jan24-LPM SNOW PR

JAN. 18riming

FEBRUARY 2 SNOW PELLETS

FEB. 4 FOG/DRZ

Feb.4 -CL51 Ceilometer

FEB. 4-5

APRIL 6-VIS HEAVY RAIN

APRIL 19 WET SNOW-DRZ CASE

• 7 RADIOSONDES WERE RELEASED:• [0845;1100;1300;1530;1730;2045 LST]

• WETSNOW-IP-RAIN-DRIZZLE FROM 11AM TO 7 PM

APRIL 19

FUTURE WORK• Snow type prediction using LPM

• Improve Fog/precipitation Vis parameterizations

• Develop algorithms for satellite retrievals of cold cloud microphysics

• Include new scanning Doppler Lidar and UAV platforms for winter project