nws tornado operations dia control tower discussion august ... · dia control tower discussion...
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NWS Tornado Operations DIA Control Tower Discussion
August 21, 2014
Mt Evans Tornado 7/28/12 Courtesy Tyler Demi-Breuer
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Tornadoes in Colorado
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Impact Based Warning Experimental Product
On April 1, 2013 – Expands to include all offices in NWS Central Region
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Impact Based Warning Experimental Product
Tornado Tag TORNADO...RADAR INDICATED Evidence on radar and near storm
environment is supportive of a tornado. A tornado may be developing or ongoing, but no confirmation has been received.
TORNADO...OBSERVED Tornado is confirmed by spotters, law enforcement, etc.
Tornado Damage Threat Tag TORNADO DAMAGE THREAT...CONSIDERABLE
There is credible evidence that a tornado, capable of producing considerable damage, is imminent or ongoing.
TORNADO DAMAGE THREAT...CATASTROPHIC
A severe threat to human life and catastrophic damage from a tornado is occurring. This will only be used when reliable sources confirm a violent tornado.
Tornado Tag In Severe Thunderstorm Warnings
TORNADO...POSSIBLE A severe thunderstorm has some potential for producing a tornado although forecaster confidence is not hi h h t i T d
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These are both tornadoes
Supercell Non supercell Stormscale rotation no storm rotation Mesocyclone no mesocyclone Tornado forms in tornado forms in early mature thunderstorm. stage of development. On radar, look for large On radar, look for a rotating storm. boundary. Good warning verification poor warning
verification Can be violent or weak tend to be weak
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Less common, harder to detect
The Wedge Tornado 5/22/09, Weld County Courtesy State Farm
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DIA Tornado-June 18, 2013 Non-Supercell Tornado
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Hazardous Weather Outlook (HWO)
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