Tornado Watch 600

Issued

Aug 15, 2007, 10:35 PM EDT (02:35 UTC)

Expired

Aug 16, 2007, 2:38 AM EDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Northern Indiana radar (KIWX), 21 km from the middle of the area, began a volume at 02:37 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

10%

Ten or more severe wind reports

50%

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 1763Aug 15, 10:11 PM EDT
• Mesoscale Discussion 1764Aug 16, 12:01 AM EDT

000
WWUS20 KWNS 160235
SEL0  
SPC WW 160235
INZ000-OHZ000-LMZ000-160800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 600
NWS STORM PREDICTION CENTER NORMAN OK
1030 PM EDT WED AUG 15 2007

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

       NORTHERN INDIANA
       NORTHWEST OHIO
       LAKE MICHIGAN

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1030 PM
UNTIL 400 AM EDT.

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 40 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF
VALPARAISO INDIANA TO 65 MILES EAST OF FORT WAYNE INDIANA.  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.

DISCUSSION...SMALL MCS OVER NW IND HAS FORMED IN THE PAST 90 MINUTES
ON WRN SIDE OF COLD POOL/MCV ASSOCIATED WITH EARLIER CONVECTIVE
SYSTEM.  THE MCS  SHOULD REMAIN STRONG THROUGH EARLY THURSDAY AND
TRACK ESE INTO OH.  A SUPERCELL NOW PRESENT ON WRN SIDE OF SYSTEM
WILL POSE A THREAT FOR ISOLATED TORNADOES...IN ADDITION TO DAMAGING
WET MICROBURSTS/ MARGINALLY SVR HAIL...GIVEN HI PWS AND LOW LEVEL
WIND FIELD WITH CONSIDERABLE DEGREE OF SPEED/DIRECTIONAL SHEAR. 
WIND PROFILES MAY ALSO SUPPORT BACK-BUILDING DEVELOPMENT ON WRN SIDE
OF MCS...WITH ASSOCIATED LOCALLY HEAVY RAIN POSSIBLE INTO FAR NE
IL/NRN IND IN WAKE OF SUPERCELL.

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 550.
MEAN STORM MOTION VECTOR 30030.


...CORFIDI

Tornado Watches in Indiana, 2007Tornado Watches in Ohio, 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.