Severe Thunderstorm Watch 708

Issued

Aug 9, 2005, 2:20 PM CDT (19:20 UTC)

Expired

Aug 9, 2005, 9:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

The Sioux Falls radar (KFSD), 117 km from the middle of the area, began a volume at 19:21 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.

• Mesoscale Discussion 1947Aug 9, 11:25 AM CDT
• Mesoscale Discussion 1948Aug 9, 11:51 AM CDT
• Mesoscale Discussion 1952Aug 9, 5:26 PM CDT

000 
WWUS20 KWNS 091922
SEL8  
SPC WW 091922
IAZ000-MNZ000-NEZ000-SDZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 708
NWS STORM PREDICTION CENTER NORMAN OK
220 PM CDT TUE AUG 9 2005

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

       NORTHWEST IOWA
       SOUTHWEST AND CENTRAL MINNESOTA
       NORTHEAST NEBRASKA
       FAR SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 220 PM UNTIL 900
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF
NORFOLK NEBRASKA TO 15 MILES EAST NORTHEAST OF MINNEAPOLIS
MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 706...WW 707...

DISCUSSION...WEAK SHORTWAVE TROUGH MOVING EWD ACROSS THE PLAINS AND
SURFACE COLD FRONT SHIFTING SEWD WILL CONTINUE TO SUPPORT INCREASE
IN THUNDERSTORMS ACROSS WW THIS AFTERNOON/EVENING.  AIR MASS IS
ALREADY VERY UNSTABLE. THOUGH SHEAR IS MODEST AT BEST...DEGREE OF
INSTABILITY AND PRESENCE OF DEEP ASCENT TO FOCUS DEVELOPMENT SHOULD
SUPPORT MULTICELL CLUSTERS/LINES.  STORMS WILL REMAIN CAPABLE OF
LARGE HAIL AND DAMAGING WINDS AS THEY MOVE ESEWD THROUGH THE
EVENING.

AVIATION...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 500. MEAN STORM
MOTION VECTOR 28020.


...EVANS

413,0982 445,0943 445,0911 413,0951

Severe Thunderstorm Watches in Iowa, 2005Severe Thunderstorm Watches in Minnesota, 2005Severe Thunderstorm Watches in Nebraska, 2005Every severe thunderstorm watch in 2005

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.