Tornado Watch 539

Issued

Oct 13, 2014, 2:24 PM CDT (19:24 UTC)

Expired

Oct 13, 2014, 9:10 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

The Lincoln radar (KILX), 46 km from the middle of the area, began a volume at 19:24 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

40%

One or more EF2 to EF5 tornadoes

10%

Ten or more severe wind reports

20%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 1872Oct 13, 1:08 PM CDT
• Mesoscale Discussion 1876Oct 13, 3:19 PM CDT
• Mesoscale Discussion 1877Oct 13, 3:42 PM CDT
• Mesoscale Discussion 1881Oct 13, 5:47 PM CDT

754 
WWUS20 KWNS 131930
SEL9  
SPC WW 131930
ILZ000-140300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 539
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT MON OCT 13 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND EASTERN ILLINOIS

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHEAST OF
BLOOMINGTON ILLINOIS TO 50 MILES SOUTH SOUTHWEST OF MATTOON
ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 535...WW 536...WW
537...WW 538...

DISCUSSION...GIVEN RICH MOISTURE...CONVERGENCE WITHIN NRN PART OF
EXTENSIVE SSW-NNE LWR-MID MS VLY SQLN MAY BE SUFFICIENT TO SUPPORT
ADDITIONAL UPDRAFT DEVELOPMENT IN ZONE OF STRENGTHENING SSWLY DEEP
SHEAR ORIENTED PARALLEL TO THE LINE. THIS SETUP MAY FOSTER A
CONDITIONAL RISK FOR SHORT-LIVED TORNADOES FROM SHOWERS/WEAK
TSTMS...DESPITE FEEBLE LOW TO MID-LVL LAPSE RATES. SUPPORT FOR
DEVELOPMENT ALSO WILL BE ENHANCED BY INCREASING ASCENT WITH THE
CONTINUED EWD MOTION OF SRN PLNS UPR TROUGH.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
300. MEAN STORM MOTION VECTOR 20040.


...CORFIDI

Tornado Watches in Illinois, 2014Every tornado watch in 2014

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.