Tornado Watch 668

Issued

Jun 25, 1998, 6:30 PM EDT (22:30 UTC)

Expired

Jun 26, 1998, 1:00 AM EDT

In force

7 hr

Issued by

the Storm Prediction Center

703 
WWUS9 KMKC 252208
SEL8  
MKC WW 252208
MIZ000-LMZ000-LHZ000-260500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 668
STORM PREDICTION CENTER NORMAN OK
608 PM EDT THU JUN 25 1998

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

   NORTHERN MICHIGAN                           
   EASTERN LAKE MICHIGAN                      
   NORTHERN LAKE HURON                         
   EASTERN LAKE SUPERIOR

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 630 PM UNTIL
100 AM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EITHER SIDE OF
A LINE FROM 65 MILES NORTHWEST OF TRAVERSE CITY MICHIGAN TO 30
MILES NORTHEAST OF ALPENA 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 665...WW 666...WW 667...

DISCUSSION...POTENTIAL FOR SUPERCELLS AND ISOLATED TORNADOES THIS
EVENING ACROSS NORTHERN MI...WHERE WARM ADVECTION WILL MAXIMIZE
INVOF NEARLY STATIONARY WARM FRONT.  MODERATE VERTICAL SHEAR /59-60
KT WLY FLOW AT 500 MB/ AND RESPECTABLE SURFACE-BASED CAPE /ABOVE
3000 J/KG/ SUFFICENT TO SUPPORT BOWS AND LARGE HAIL.    

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 520. 
MEAN STORM MOTION VECTOR 27035.


...CORFIDI

463,0863 463,0830 440,0830 440,0863

Tornado Watches in Michigan, 1998Every tornado watch in 1998

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.