Severe Weather? What Happened… Jim Connolly NWS New York, NY April 2009.
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Transcript of Severe Weather? What Happened… Jim Connolly NWS New York, NY April 2009.
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Severe Weather? What Happened…
Severe Weather? What Happened…
Jim ConnollyNWS New York, NY
April 2009
Jim ConnollyNWS New York, NY
April 2009
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Data UsedData Used
• NCEP/NCAR Reanalysis Upper Air Data
• U.S. Daily Weather Maps from the NOAA Central Library
• Archived Sounding Data
• Archived Surface Observations from NCDC
• NCEP/NCAR Reanalysis Upper Air Data
• U.S. Daily Weather Maps from the NOAA Central Library
• Archived Sounding Data
• Archived Surface Observations from NCDC
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The SetupThe Setup
• The following 4 slides show the Jet Stream
• Level analyzed 200 mb
• Time period 12Z the day prior until 12Z the day after
• The following 4 slides show the Jet Stream
• Level analyzed 200 mb
• Time period 12Z the day prior until 12Z the day after
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The SetupThe Setup
• The following 4 slides show 500 mb Geopotential Heights and Wind Vectors
• Time period 12Z the day prior until 12Z the day after
• The following 4 slides show 500 mb Geopotential Heights and Wind Vectors
• Time period 12Z the day prior until 12Z the day after
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The SetupThe Setup
• The following 3 slides show Precipitable Water (in inches)
• First slide is Normal Precipitable Water for the month
• Second slide is 12Z the day of the event
• Third slide is 00Z that evening
• The following 3 slides show Precipitable Water (in inches)
• First slide is Normal Precipitable Water for the month
• Second slide is 12Z the day of the event
• Third slide is 00Z that evening
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The SetupThe Setup
• The following 2 slides show 850 mb isotachs and wind vectors
• Time period is 12Z the day of the event through 00Z that evening
• The following 2 slides show 850 mb isotachs and wind vectors
• Time period is 12Z the day of the event through 00Z that evening
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The SetupThe Setup
• The following 3 slides are surface charts
• Time period is 12Z the day prior through 12Z the day after
• The following 3 slides are surface charts
• Time period is 12Z the day prior through 12Z the day after
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The SetupThe Setup
• The following 4 slides are Skew-Ts from KALB
• Time period is 12Z and 20Z the day of (low levels modified based on surface obs for 20Z sounding)
• The following 4 slides are Skew-Ts from KALB
• Time period is 12Z and 20Z the day of (low levels modified based on surface obs for 20Z sounding)
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So What Happened…So What Happened…
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July 10, 1989July 10, 1989
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July 10, 1989July 10, 1989
• F4 Tornado In Hamden, CT
• Strongest Recorded Tornado in the Tri-State Region (OKX Forecast Area)
• $250 Million in Damage
• 90 Injuries
• No Fatalities
• F4 Tornado In Hamden, CT
• Strongest Recorded Tornado in the Tri-State Region (OKX Forecast Area)
• $250 Million in Damage
• 90 Injuries
• No Fatalities
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Across the Tri-State AreaAcross the Tri-State Area
• 6 Tornadoes Total
• 1 F4
• 3 F2
• 2 F0
• $330 Million in Damage
• 96 Injuries
• 6 Tornadoes Total
• 1 F4
• 3 F2
• 2 F0
• $330 Million in Damage
• 96 Injuries
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Breakdown by LocationBreakdown by Location
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Questions?Questions?