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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
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
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