Tornado Watch 879

Issued

Nov 14, 2011, 11:41 AM CST (17:41 UTC)

Expired

Nov 14, 2011, 7:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

65 kt

The Indianapolis radar (KIND), 81 km from the middle of the area, began a volume at 17:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 2313Nov 14, 11:24 AM CST
• Mesoscale Discussion 2314Nov 14, 12:27 PM CST
• Mesoscale Discussion 2315Nov 14, 1:57 PM CST
• Mesoscale Discussion 2316Nov 14, 3:38 PM CST
• Mesoscale Discussion 2318Nov 14, 5:32 PM CST

603 
WWUS20 KWNS 141747
SEL9
SPC WW 141747
ILZ000-INZ000-OHZ000-150100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 879
NWS STORM PREDICTION CENTER NORMAN OK
145 PM EDT MON NOV 14 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       EAST-CENTRAL AND SOUTHERN ILLINOIS
       INDIANA
       WESTERN OHIO

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 900
PM EDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF
DECATUR ILLINOIS TO 70 MILES EAST OF FORT WAYNE INDIANA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

DISCUSSION...INCIPIENT SURFACE-BASED TSTMS ARE EXPECTED TO DEVELOP
INVOF MIGRATORY SURFACE LOW AND ASSOCIATED WARM FRONT WHERE PRESSURE
FALLS ARE FOCUSING LOW-LEVEL CONVERGENCE.  HERE...AREA VAD AND RUC
OBJECTIVE DATA INDICATE VERY STRONG LOW- AND DEEP-LAYER SHEAR WHICH
WILL SUPPORT SUPERCELLS AND BOWING STRUCTURES CAPABLE OF A FEW
TORNADOES AND DAMAGING WINDS.  GIVEN THE MAGNITUDE OF THE LOW-LEVEL
SHEAR AND ANTICIPATED FAST STORM MOTIONS...A TORNADO OR TWO COULD BE
STRONG AND POTENTIALLY LONG-TRACKED.
EXPECT ADDITIONAL STORMS TO FORM ALONG THE TRAILING COLD FRONT
ADVANCING THROUGH SRN IL WITH AN ATTENDANT RISK FOR DAMAGING WINDS
AND PERHAPS A TORNADO OR TWO.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.
MEAN STORM MOTION VECTOR 26050.


...MEAD

Tornado Watches in Indiana, 2011Tornado Watches in Ohio, 2011Tornado Watches in Illinois, 2011Every tornado watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.