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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.

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severe weather what happened

Severe Weather? What Happened…

Jim ConnollyNWS New York, NYApril 2009

data used
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 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 setup1
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 setup2
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 setup3
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 setup4
The Setup
  • The following 3 slides are surface charts
  • Time period is 12Z the day prior through 12Z the day after
the setup5
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 19891
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
Across the Tri-State Area
  • 6 Tornadoes Total
  • 1 F4
  • 3 F2
  • 2 F0
  • $330 Million in Damage
  • 96 Injuries