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The Jarrell, TX Tornado: May 27, 1997. Karin Swanson AOS 453 May 11, 2000. What happened?. May 27, 1997-huge tornado outbreak 24 tornadoes were sighted throughout Texas Tornadoes ranged from F0 to F5. They were just funnel clouds in some areas, and huge causes of destruction in others.

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the jarrell tx tornado may 27 1997

The Jarrell, TX Tornado:May 27, 1997

Karin Swanson

AOS 453

May 11, 2000

what happened
What happened?
  • May 27, 1997-huge tornado outbreak
  • 24 tornadoes were sighted throughout Texas
  • Tornadoes ranged from F0 to F5. They were just funnel clouds in some areas, and huge causes of destruction in others
jarrell texas
Jarrell, Texas
  • F5 on the Fujita scale
  • Touched down at 2:40 pm CST
  • Vortex 1/2 mile wide
  • Property damage $40.0 million
  • Crop damage $100,000
  • 27 deaths in Jarrell alone
what made the jarrell tornado occur
What made the Jarrell tornado occur?
  • Synoptic overview
  • Mesoscale analysis
    • satellites
    • sounding
    • indices for the area
what is needed for a tornado
What is needed for a tornado?
  • Dry area to west of tornado area
  • Vertical wind shear
  • Latent instability
  • Middle level jet
  • Moist air at surface
  • Dry air aloft
probabilities
Probabilities
  • Helicity=56.0 m^2/s^2 (12Z)
          • +
  • CAPE=3447 J/kg
          • =
          • Good Chance for Tornado
indices from 12z
Indices (from 12Z)
  • Lifted Index=-9.59C > Probable T-storm
  • Showalter=3.77C >No chance
  • Total Totals=43.60C >No chance
  • K Index=21.10 >20-40% chance
  • Sweat Index=45.50 > No chance
  • BRN=152.20
  • CAP=4.8
conclusion
Conclusion
  • Several things happened on May 27, 1997 in Texas to make tornadic activity possible.
    • Large CAPE coupled with a lower helicity and a strong cap
    • Moist air was present at lower levels, while dry air was present aloft
    • Supercell progression through Texas