Case 2 - December 29-30, 2000

Data Overview 12 Hours Prior to Onset of Precipitation

  • Satellite Imagery 12/28 1200 UTC through 12/30 0000 UTC:  Water Vapor (6.7µm) and Infrared
  • Identification of Synoptic-Scale Features and Orientation of Axes
  • Upper impulse exits the southeast U.S.
  • Upper Impulse exits the northeast U.S.
  • Upper low dives south and southeast out of the Dakotas into the TN Valley while upper impulse in northwestern periphery of the upper low is just north of the Dakotas
  • Evolution of Moisture
  • No interaction with Gulf of Mexico, Atlantic or Pacific moisture
  • No deep cloud cover below 600 Mb associated with the upper low
  • Subsidence/Darkening - Darkening seen on southern periphery of upper low, associated with upper impulse
  • Interaction with Tropical/Subtropical Plumes - No interaction
  • Identification of Upper Jet Streaks - Darkening and subsidence associated with the upper impulse tracking around the southern periphery of the upper low by 0000 UTC 12/30
  •   Upper Air Analyses 12/28 1200 UTC through 12/30 0000 UTC:  300 Mb, 500 Mb and 850 Mb
  • Identification of Synoptic-Scale Features and Orientation of Axes
  • Identification of Upper/Low-Level Jet Streaks
  • 850 Mb Thermal and Moisture Advection
  •   Surface Data and Trends
  • Thermodynamic Profiles (Upper Air Observations) 12/30/00:  Wallops Is. (WAL), Greensboro (GSO) and Morehead City (MHX)
  • 12/29 1200 UTC and 12/30 0000 UTC Surface Plots
  • 12/30 0000-0300 UTC radar data
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