Tornado Watch 439

Issued

Jun 3, 2008, 5:56 PM CDT (22:56 UTC)

Expired

Jun 4, 2008, 2:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Lincoln radar (KILX), 50 km from the middle of the area, began a volume at 22:55 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

40%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1184Jun 3, 5:38 PM CDT
• Mesoscale Discussion 1189Jun 3, 9:26 PM CDT
• Mesoscale Discussion 1194Jun 3, 11:34 PM CDT

000
WWUS20 KWNS 032300
SEL9  
SPC WW 032300
ILZ000-MOZ000-040700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 439
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT TUE JUN 3 2008

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

       CENTRAL ILLINOIS
       SMALL PART OF EAST CENTRAL MISSOURI

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 600 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 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 15 MILES SOUTHWEST OF QUINCY
ILLINOIS TO 25 MILES SOUTH OF DANVILLE ILLINOIS.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 435...WW 437...WW 438...

DISCUSSION...OUTFLOW BOUNDARY FROM LAST NIGHT/S MCS WAS BEGINNING TO
STRENGTHEN FROM PARTS OF CNTRL/NRN MO EWD INTO CNTRL IL.  AS LARGER
SCALE HEIGHT FALLS BEGIN TO SPREAD EWD FROM THE PLAINS AND THE SSWLY
LLJ STRENGTHENS...THE BOUNDARY WILL TIGHTEN WITH CONVECTION
GRADUALLY DEEPENING THIS EVENING.  ROUGHLY 50 KTS OF 0-6KM SHEAR AND
MAGNITUDE OF MID-TROPOSPHERIC LAPSE RATES IS SUPPORTIVE OF
SUPERCELLS WITH LARGE HAIL.  IN ADDITION...GENTLY BACKING NEAR-SFC
FLOW...LOW LCL ENVIRONMENT AND PRESENCE OF THE BOUNDARY WILL BE
CONDUCIVE FOR TORNADOES WITH ANY SUPERCELL THIS EVENING. 
LATER...ACTIVITY WILL MERGE INTO AN MCS WITH DMGG WINDS BECOMING
MORE LIKELY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28030.


...RACY/THOMPSON

Tornado Watches in Illinois, 2008Tornado Watches in Missouri, 2008Every tornado watch in 2008

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.