Tornado Watch 720

Issued

Oct 18, 2007, 2:27 AM CDT (07:27 UTC)

Expired

Oct 18, 2007, 6:38 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Evansville,IN radar (KVWX), 83 km from the middle of the area, began a volume at 07:30 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

40%

One or more gusts of 65 knots or more

10%

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

80%

• Mesoscale Discussion 2103Oct 17, 10:56 PM CDT
• Mesoscale Discussion 2104Oct 18, 12:27 AM CDT
• Mesoscale Discussion 2105Oct 18, 2:02 AM CDT
• Mesoscale Discussion 2107Oct 18, 4:08 AM CDT

000
WWUS20 KWNS 180727
SEL0  
SPC WW 180727
ILZ000-INZ000-KYZ000-181400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 720
NWS STORM PREDICTION CENTER NORMAN OK
225 AM CDT THU OCT 18 2007

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

       SOUTHEAST ILLINOIS
       SOUTHWEST INDIANA
       WESTERN KENTUCKY

EFFECTIVE THIS THURSDAY MORNING FROM 225 AM UNTIL 900 AM CDT.

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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHWEST OF
EVANSVILLE INDIANA TO 40 MILES SOUTH OF PADUCAH KENTUCKY.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 716...WW 717...WW
718...WW 719...

DISCUSSION...SE MO MCS EXPECTED TO CONTINUE ENE INTO NARROW AXIS OF
MODEST SFC-BASED INSTABILITY ALONG THE MID MS AND LWR OH RVR VLYS. 
CONVECTIVE SYSTEM IS LIKELY BEING INFLUENCED BY ASCENT ON SERN END
OF NEGATIVE TILT ERN KS UPR TROUGH.  WHILE SQLN SHOULD WEAKEN UPON
MOVING BEYOND INSTABILITY AXIS LATER THIS MORNING...CURRENT
CONDITIONS SUGGEST THAT EMBEDDED SUPERCELLS/SMALL SCALE BOWS SHOULD
REMAIN STRONG ENOUGH TO POSE A THREAT FOR DAMAGING WIND AND ISOLATED
TORNADOES INTO PARTS OF IL/WRN KY AND PERHAPS SW IND.

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 450.
MEAN STORM MOTION VECTOR 22045.


...CORFIDI

Tornado Watches in Kentucky, 2007Tornado Watches in Illinois, 2007Tornado Watches in Indiana, 2007Every tornado watch in 2007

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.