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This presentation by Jim Connolly from NWS New York analyzes the severe weather event that took place on July 10, 1989, featuring the F4 tornado in Hamden, CT. It leverages NCEP/NCAR Reanalysis upper air data, NOAA daily weather maps, and various archived observations to present an in-depth analysis. The presentation includes slides showcasing the jet stream, geopotential heights, wind vectors, precipitable water, isotachs, surface charts, and Skew-T analyses to elucidate the conditions leading to this significant tornado event which caused $250 million in damage and 90 injuries.
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Severe Weather? What Happened… Jim ConnollyNWS New York, NYApril 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 • The following 4 slides show the Jet Stream • Level analyzed 200 mb • Time period 12Z the day prior until 12Z the day after
The 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 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 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 Setup • The following 3 slides are surface charts • Time period is 12Z the day prior through 12Z the day after
The 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)
July 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
Across the Tri-State Area • 6 Tornadoes Total • 1 F4 • 3 F2 • 2 F0 • $330 Million in Damage • 96 Injuries
