Tornado Watch 196

Issued

Apr 11, 2008, 12:58 PM EDT (16:58 UTC)

Expired

Apr 11, 2008, 9:00 PM EDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Grand Rapids radar (KGRR), 52 km from the middle of the area, began a volume at 16:58 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

60%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 635Apr 11, 11:47 AM EDT
• Mesoscale Discussion 638Apr 11, 2:41 PM EDT
• Mesoscale Discussion 640Apr 11, 6:01 PM EDT

000
WWUS20 KWNS 111659
SEL6  
SPC WW 111659
INZ000-MIZ000-OHZ000-LEZ000-LMZ000-120100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 196
NWS STORM PREDICTION CENTER NORMAN OK
100 PM EDT FRI APR 11 2008

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

       NORTHERN INDIANA
       SOUTHERN LOWER MICHIGAN
       NORTHWEST OHIO
       LAKE ERIE
       LAKE MICHIGAN

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 900
PM EDT.

TORNADOES...HAIL TO 2 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF
SAGINAW MICHIGAN TO 30 MILES SOUTHWEST OF FORT WAYNE INDIANA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 195...

DISCUSSION...SCATTERED THUNDERSTORMS WILL DEVELOP ALONG AND
IMMEDIATELY IN ADVANCE OF THE COLD FRONT THIS AFTERNOON FROM NRN
INDIANA INTO SW LOWER MI.  STRONG VERTICAL SHEAR AND SUFFICIENT
INSTABILITY WILL SUPPORT SUPERCELLS...WITH THE POTENTIAL FOR A FEW
TORNADOES /ESPECIALLY NEAR THE WARM FRONT IN LOWER MI/...LARGE
HAIL...AND AT LEAST ISOLATED DAMAGING WINDS.  THE SEVERE STORM
THREAT WILL SHIFT EWD TO NW OH AND SE LOWER MI BY MID-LATE
AFTERNOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 23045.


...THOMPSON

Tornado Watches in Michigan, 2008Tornado Watches in Indiana, 2008Tornado Watches in Ohio, 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.