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Thunderstorms. SEVERE T-STORMS. National Weather Service definition of a severe thunderstorm Hail 3/4" or larger, or basically the size of any coin or larger (a dime is 11/16" which the NWS accepts as 3/4") Fallen tree limbs with a minimum diameter of an average adult's wrist

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Thunderstorms


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thunderstorms
Thunderstorms

SEVERE T-STORMS

National Weather Service definition of a severe thunderstorm

Hail 3/4" or larger, or basically the size of any coin or larger

(a dime is 11/16" which the NWS accepts as 3/4")

Fallen tree limbs with a minimum diameter of an average adult's wrist

Living trees uprooted or blown down

Any part of a permanent, well-built structure damaged or destroyed

Measured wind gust from a calibrated anemometer of 58 MPH (50 knots) or greater

TORNADOES

slide2

SEVERE THUNDERSTORMS

  • TYPES:
  • SQUALL LINE THUNDERSTORMS
  • 2) MESOSCALE CONVECTIVE COMPLEX (MCC)
  • SUPERCELL THUNDERSTORMS
  • All three types last much longer than
  • ordinary thunderstorms.
  • All three types need warm air and other factors
  • in order to form.
slide4

SQUALL LINE THUNDERSTORMS

*Develop ahead of cold fronts

*Multi-cell storms

*Often produce wind damage (DOWNBURSTS)

slide7

Squall Line Thunderstorms

Cooler air

Stratus clouds

Snow, sleet, rain ahead of warm front

L

North, Northwest winds

Cold air

Clearing skies

South, Southwest winds

Warm air

Clearing skies behind warm front

Until cumulus clouds and thunderstorms

ahead of the cold front

slide11

MCC

*MCC must live more than 6 hrs

*MCC high cloud cover must be larger than 18,000 square miles (size of CT, RI, MA)

*MCC high cloud cover must be circular in shape

Nebraska MCC moving Southeast, July 1997 – 7 hour difference between satellite images

CIMMS, WISC U

slide12

MCC

Rainfall due to Nebraska MCC moving Southeast, July 1997

CIMSS, WISC U

slide13

MCC

Minnesota MCC moving Southeast, June 1994

NCDC

slide14

MCC

The Great USA Flood of 1993

1993 Mississippi River, Grafton IL Flooding, USGS – the “500-year” flood

slide15

MCC

The Great USA Flood of 1993

FLOOD OLD RECORD NEW RECORD (feet) DATE

Quad Cities L/D15 22.5 650428 22.6 930709

Muscatine IA 24.8 650429 25.6 930709

Keithsburg IL 20.4 650427 24.2 930709

Burlington, IA 21.5 730425 25.1 930710

Keokuk L/D16 IA 23.4 730424 27.2 930710

Gregory Landing MO 24.6 730424 26.4 930707

Quincy IL 28.9 730423 32.2 930713

Hannibal MO 28.6 730425 31.8 930716

Louisiana MO 27.0 730424 28.4 930728

Clarksville MO L/D24 36.4 730424 37.7 930729

Winfield MO L/D25 36.8 730427 39.6 930801

Grafton IL 33.1 730428 38.2 930801

Melvin Price IL 36.7 730428 42.7 930801

St Louis MO 43.2 730428 49.6 930801

Chester IL 43.3 730430 49.7 930807

1993 Mississippi River Flooding, NOAA

slide20

SUPERCELL THUNDERSTORMS

*Vertical Wind Shear

*Two Downdrafts

slide22

SUPERCELL THUNDERSTORMS

overshooting tops over Brazil

tornados1
Tornados

A rotating column of air

tornado facts
Tornado Facts

Tornadoes occur in every state of the USA and in many countries around the world

BUT TORNADO ALLEY IS THE PLACE IN THE WORLD TO SEE THEM

NSSL

usa tornado tracks
USA Tornado Tracks

National Geographic Society

usa tornados
USA Tornados

Miami Tornado – Salt Lake City Tornado

CNN

the fujita scale
The Fujita Scale

http://www.spc.noaa.gov/faq/tornado/f-scale.html

tornado facts1
Tornado Facts

Tornadoproject.com

may 3 1999 oklahoma city tornado outbreak1
May 3, 1999 Oklahoma City Tornado Outbreak

Doppler Reflectivity & Velocity Loops:

http://severewx.atmos.uiuc.edu/18/050399.reflectivity.html

http://severewx.atmos.uiuc.edu/18/050399.velocity.html

VIS & IR Satellite Loops: http://cimss.ssec.wisc.edu/goes/misc/990503.html

may 4 6 2007 tornado outbreak
May 4-6 2007 Tornado Outbreak
  • - Multiple tornados over Kansas, Oklahoma, Texas
  • F5 Tornado destroyed the town of Greensburg, Kansas
  • - 9 confirmed fatalities
may 4 6 2007 tornado outbreak1
May 4-6 2007 Tornado Outbreak
  • - Tornado width was between 1 and 2 miles!
  • Tornado traveled over 20 miles
  • Winds reached over 200 mph
  • First F5 tornado since May 3rd 1999 Moore – Oklahoma City Tornado
dallas tornado april 3 rd 2012 amazing video
Dallas Tornado April 3rd 2012 Amazing Video

http://www.youtube.com/watch?v=uSs45dJGOlE