Severe Thunderstorm Watch 9

Issued

Jan 23, 2012, 2:14 AM EST (07:14 UTC)

Expired

Jan 23, 2012, 6:45 AM EST

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

65 kt

The Louisville radar (KLVX), 125 km from the middle of the area, began a volume at 07:15 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

5%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

50%

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

90%

• Mesoscale Discussion 54Jan 23, 1:52 AM EST
• Mesoscale Discussion 57Jan 23, 5:11 AM EST

767 
WWUS20 KWNS 230715
SEL9  
SPC WW 230715
INZ000-KYZ000-OHZ000-231400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 9
NWS STORM PREDICTION CENTER NORMAN OK
215 AM EST MON JAN 23 2012

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

       SOUTHEASTERN INDIANA
       CENTRAL AND EASTERN KENTUCKY
       SOUTHERN OHIO

EFFECTIVE THIS MONDAY MORNING FROM 215 AM UNTIL 900 AM EST.

HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF
CINCINNATI OHIO TO 50 MILES SOUTHWEST OF LONDON KENTUCKY.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 7...WW 8...

DISCUSSION...CNTRL IND/KY SQLN EXPECTED TO CONTINUE EWD INTO OH AND
ERN KY THROUGH LATER THIS MORNING.  AREA VWP DATA SHOW STRENGTHENING
SSWLY LLJ IMMEDIATELY AHEAD OF LINE...WITH 850 MB SPEEDS NOW AROUND
80 KTS.  THE LLJ SHOULD REMAIN STRONG AS ASSOCIATED UPR VORT NOW
ENTERING WRN KY ASSUMES MORE OF A NEGATIVE TILT AND HEADS NEWD. 
THUS...DESPITE INCREASINGLY MORE HOSTILE LOW-LVL THERMODYNAMIC
ENVIRONMENT FOR SVR SFC WINDS WITH EWD EXTENT...COMBINATION OF
INCREASING NEAR-SFC FLOW WITH INCREASING DPVA AND RISING TERRAIN MAY
SUPPORT A CONTINUED RISK FOR DMGG WIND EWD INTO WW AREA.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300. MEAN STORM
MOTION VECTOR 24045.


...CORFIDI

Severe Thunderstorm Watches in Kentucky, 2012Severe Thunderstorm Watches in Ohio, 2012Severe Thunderstorm Watches in Indiana, 2012Every severe thunderstorm 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.