severe weather? what happened…

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Severe Weather? What Happened… Jim Connolly NWS New York, NY April 2009

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Severe Weather? What Happened…. Jim Connolly NWS New York, NY April 2009. Data 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. The Setup. - PowerPoint PPT Presentation

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Page 1: Severe Weather? What Happened…

Severe Weather? What Happened…

Severe Weather? What Happened…

Jim ConnollyNWS New York, NY

April 2009

Jim ConnollyNWS New York, NY

April 2009

Page 2: Severe Weather? What Happened…

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

Page 3: Severe Weather? What Happened…

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

Page 34: Severe Weather? What Happened…

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

Page 35: Severe Weather? What Happened…

Breakdown by LocationBreakdown by Location

Page 36: Severe Weather? What Happened…

Questions?Questions?