January 21-22, 1999 Arkansas Tornado Outbreak
Case Study

By Ming Xue, Center for Analysis and Prediction of Storms
University of Oklahoma

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ARPS Simulation / Forecasting Results

• Grid Configuration
• 32 km run (jan21Gassim ) 
  
  • precipitation  
  • isentropic PV maps.
    
• 6km run ( jan21Hassim6km )
  
  • Surface maps with precipitation 
  • Surface temperature 
  • Surface map with CAPE
  • Upper plots showing jet strength
  • 295, 307, 315 K isentropic surface plots
  • Vertical cross-section through Little Rock, AR
  • ARPS extracted sounding at Little Rock, AR
    
• 2km run ( jan21Hassim2km ) 
  
  • Surface map with precipitation 
  • Surface temperature.
    
• PowerPoint Presentation at (http://pcmx.ou.edu/artorppt/AKtor2.html).
• Other runs

Observations

• NCEP Precipitation Analysis
• Radar loops for Central US
• Radar loops for NE US

ETA Analysis

• ETA surface analysis

Little Rock National Weather Service

• Making Tornado History in 1999.
• 1999 Tornado Outbreaks in Arkansas.
• Tornado Outbreak of January 21, 1999
• Storm Data for AR area

CIRA/CSU Satellite Images and Discussion

• Satellite Images
• Case Discussion

NASA/GDSF Sat Image Movie

Killer tornados in Arkansas (7.8 MByte QT movie) just after sunset on 21 January 1999. This GOES-8 false color movie uses sharpened thermal infrared overlaid on a blue-green ocean-land map, and blends in the sharper visible data during the day, using a yellow tint for the low clouds. Obtained from this site.

HubCAPS Verification Images

• 19990121
• 19990122
• 19990123
• Nexrad Images