Tornado Watch 802

Issued

Aug 24, 2011, 6:00 PM EDT (22:00 UTC)

Expired

Aug 24, 2011, 11:07 PM EDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Detroit radar (KDTX), 125 km from the middle of the area, began a volume at 22:00 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

90%

One or more gusts of 65 knots or more

40%

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

95%

• Mesoscale Discussion 2048Aug 24, 4:46 PM EDT
• Mesoscale Discussion 2052Aug 24, 8:25 PM EDT

223 
WWUS20 KWNS 242206
SEL2
SPC WW 242206
MIZ000-LEZ000-LHZ000-250500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 802
NWS STORM PREDICTION CENTER NORMAN OK
600 PM EDT WED AUG 24 2011

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

       EASTERN...CENTRAL...AND SOUTHERN LOWER MICHIGAN
       LAKE ERIE
       LAKE HURON

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 600 PM
UNTIL 100 AM EDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHEAST OF OSCODA
MICHIGAN TO 35 MILES SOUTHWEST OF JACKSON MICHIGAN.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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 801...

DISCUSSION...TSTMS EXPECTED TO INCREASE ALONG AND AHEAD OF COLD
FRONT ASSOCIATED WITH AMPLIFYING SHORTWAVE TROUGH NOW OVER CNTRL WI.
STRENGTHENING WIND FIELD...WITH 40 KT WSW 850 MB FLOW VEERING TO
50-60 KT WNW FLOW AT 500 MB...WILL SUPPORT A FEW STRONG / SUSTAINED
SUPERCELLS GIVEN DEGREE OF INSTABILITY AND MODEST LOW LVL
CONVERGENCE.  WHILE THE TORNADO THREAT SHOULD BE GREATEST IN ERN
PART OF WW...ENTIRE REGION WILL BE SUBJECT TO THE POTENTIAL FOR
SUPERCELLS AND POSSIBLY STORM SPLITS WITH LARGE HAIL AND BOWS WITH
DMGG WIND.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 29045.


...CORFIDI

Tornado Watches in Michigan, 2011Every tornado watch in 2011

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.