The Jarrell, TX Tornado: May 27, 1997
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Transcript of The Jarrell, TX Tornado: May 27, 1997
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The Jarrell, TX Tornado:May 27, 1997
Karin Swanson
AOS 453
May 11, 2000
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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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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
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What made the Jarrell tornado occur?
Synoptic overview Mesoscale analysis
– satellites– sounding– indices for the area
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Mean Sea Level Pressure Analysis
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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
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Miller diagram
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Conceptual Model
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Probabilities
Helicity=56.0 m^2/s^2 (12Z)
+ CAPE=3447 J/kg
=
Good Chance for Tornado
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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
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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
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Questions?