Tornado Watch 1

Issued

Jan 16, 2012, 11:47 PM CST (05:47 UTC)

Expired

Jan 17, 2012, 7:00 AM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Springfield radar (KSGF), 128 km from the middle of the area, began a volume at 05:50 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

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

60%

• Mesoscale Discussion 20Jan 16, 11:23 PM CST
• Mesoscale Discussion 21Jan 17, 1:50 AM CST
• Mesoscale Discussion 22Jan 17, 6:25 AM CST

317 
WWUS20 KWNS 170552
SEL1
SPC WW 170552
ILZ000-MOZ000-171300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 1
NWS STORM PREDICTION CENTER NORMAN OK
1150 PM CST MON JAN 16 2012

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

       WEST CENTRAL ILLINOIS
       SOUTHWEST THROUGH EAST CENTRAL MISSOURI

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1150 PM
UNTIL 700 AM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF
SPRINGFIELD MISSOURI TO 30 MILES NORTH NORTHEAST OF ALTON
ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...SCTD TSTMS HAVE INCREASED IN THE PAST HOUR ALONG AND
AHEAD OF SW-NE COLD FRONT THROUGH CNTRL MO.  STORMS MAY SOMEWHAT
INCREASE IN COVERAGE AND POSSIBLY STRENGTH THROUGH EARLY TUE AS
REGION IS GLANCED BY NEXT WEAK IMPULSE SHEARING ENEWD AHEAD OF MAIN
UPR TROUGH MOVING E FROM CNTRL KS.  NEAR-SFC SSWLY FLOW WILL
MAINTAIN LOW LVL WAA ACROSS REGION...WITH SFC TEMPS AROUND 60 F AND
SFC DEW POINTS IN THE MID/UPR 50S.  THIS SETUP MAY YIELD A FEW SHORT
LINES/BROKEN SEGMENTS OF STORMS CAPABLE OF LOCALLY DMGG WIND AND
PERHAPS ONE OR TWO QLCS TORNADOES GIVEN COOL MID LVL TEMPS/STRENGTH
OF CLOUD LAYER FLOW.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350.
MEAN STORM MOTION VECTOR 25045.


...CORFIDI

Tornado Watches in Missouri, 2012Tornado Watches in Illinois, 2012Every tornado watch in 2012

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.