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Watches, Warnings and Wind on February 11, 2009. National Weather Service Partners Workshop June 25, 2009. Ken Reeves Director, Forecasting Operations AccuWeather, Inc. 814-235-8751 [email protected]. Brief Weather Setup. Large synoptic storm moving through the Midwest - PowerPoint PPT Presentation
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Watches, Warnings and Wind on February 11, 2009
National Weather Service Partners Workshop
June 25, 2009
Ken ReevesDirector, Forecasting Operations
AccuWeather, Inc.814-235-8751
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Brief Weather Setup• Large synoptic storm moving through the
Midwest
• Lifting warm front and aligned winds
• Strong 500mb low and cold front
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NWS Products Issued• High wind warnings out for most locations east of the
Mississippi for February 11th• Wind warnings extended to East Coast in wake of front
February 12th• 7 severe weather watches issues• Many severe weather warnings issued -- offices
averaging 10 to 30 -- most tornado warnings through mid-afternoon
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Thunderstorm and Tornado Watches
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Thunderstorm and Tornado Watches
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High Wind Watches, Warnings and Advisories
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Thunderstorm and Tornado Warnings
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The Outcome• Three tornadoes reported• 335 wind report to SPC of which 18% had
verified wind speeds reaching severe criteria• Damage continued February 12th but no wind
reports to SPC• Strongest winds in the wake of the cold front
– Wind increase upon arrival of precipitation/cold front generally 10 to 30% higher than pre-frontal synoptic winds
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Surface Data from Louisville, Kentucky
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Items For Consideration• User confusion• Tornado fatigue (watch/warn)
– Another hurricane eye wall warning problem
• Optimizing for effective delivery– Large short fuse warnings areas in a storm warning
environment
• “Severe” weather reports
http://nws.met.psu.edu/severe/2009/12Feb2009.pdf
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Watches, Warnings and Wind on February 11, 2009
National Weather Service Partners Workshop
June 25, 2009
Ken ReevesDirector, Forecasting Operations
AccuWeather, Inc.814-235-8751
