Tornado Watch 734

Issued

Sep 9, 2001, 3:00 PM EDT (19:00 UTC)

Expired

Sep 9, 2001, 10:00 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

The Grand Rapids radar (KGRR), 61 km from the middle of the area, began a volume at 18:59 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.

786 
WWUS9 KMKC 091835
SEL4  
MKC WW 091826
MIZ000-LMZ000-LEZ000-LHZ000-100000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 734
STORM PREDICTION CENTER NORMAN OK
226 PM EDT SUN SEP 9 2001

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

   LOWER MICHIGAN                           
   LAKE MICHIGAN                      
   LAKE ERIE                          
   LAKE HURON                         

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL 800
PM EDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST
OF A LINE FROM 45 MILES SOUTHEAST OF KALAMAZOO MICHIGAN TO 15 MILES
WEST NORTHWEST OF OSCODA MICHIGAN.

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...LARGE PRESSURE FALL-RISE COUPLET HAS DEVELOPED WITH
FALL CENTER MOVING NEWD FROM NEAR CHICAGO.  AIRMASS OVER LWR MI HAS
WARMED UP AND DEW POINTS ARE IN THE LOW 70S. GIVEN BACKED FLOW TO
THE NE OF THE IL SURFACE LOW AND INCREASING MID LEVEL FLOW
MESOCYCLONES ARE LIKELY EITHER AS A PART OF A LINE OR AS ISOLATED
LOW TOPPED SUPERCELLS.  THERE WILL BE A TORNADO THREAT WITH SOME OF
THE MESOCYCLONES.   DAMAGING WINDS ARE ALSO POSSIBLE WITH RISK OF
BOW ECHO DEVELOPMENT.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. 
MEAN STORM MOTION VECTOR 22035.


...JOHNS

443,0814 414,0830 414,0864 443,0853

Tornado Watches in Michigan, 2001Every tornado watch in 2001

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.