Tornado Watch 685

Issued

Jul 8, 2003, 2:05 PM MDT (20:05 UTC)

Expired

Jul 8, 2003, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

• Mesoscale Discussion 1704Jul 8, 10:53 AM MDT
• Mesoscale Discussion 1712Jul 8, 1:36 PM MDT
• Mesoscale Discussion 1719Jul 8, 4:38 PM MDT

000 
WWUS20 KWNS 082006
SEL5  
SPC WW 082005
MTZ000-NDZ000-SDZ000-WYZ000-090300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 685 
NWS STORM PREDICTION CENTER NORMAN OK 
205 PM MDT TUE JUL 8 2003

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

       SOUTHEASTERN MONTANA
       SOUTHWESTERN NORTH DAKOTA
       WESTERN SOUTH DAKOTA
       NORTHEASTERN WYOMING

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900
PM MDT.

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 110 STATUTE MILES EAST AND
WEST OF A LINE FROM 85 MILES NORTH NORTHWEST OF REDIG SOUTH DAKOTA
TO 75 MILES SOUTH SOUTHWEST OF RAPID CITY SOUTH DAKOTA.

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 680...WW 681...WW 682...WW
683...WW 684...


DISCUSSION...STRONG FORCING IS SPREADING INTO THE AREA AND STORMS
ARE EXPECTED TO DEVELOP RAPIDLY. MLCAPES HAVE INCREASED TO NEAR 1000
J/KG AND 50-60 KT DEEP LAYER SHEAR WILL BE SUFFICIENT FOR
SUPERCELLS. THE STRENGTH OF THE UPPER FORCING AND 20-30 KT LOW LEVEL
SHEAR SUGGESTS THAT TORNADOES ARE ALSO LIKELY.

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 500.
MEAN STORM MOTION VECTOR 26030.


...IMY

462,1015 430,1012 430,1054 462,1063

Tornado Watches in South Dakota, 2003Tornado Watches in Montana, 2003Tornado Watches in Wyoming, 2003Every tornado watch in 2003

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.