Severe Thunderstorm Watch 607

Issued

Jul 17, 2006, 2:28 PM CDT (19:28 UTC)

Expired

Jul 17, 2006, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Quad Cities radar (KDVN), 153 km from the middle of the area, began a volume at 19:28 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

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1536Jul 17, 12:09 PM CDT
• Mesoscale Discussion 1541Jul 17, 5:34 PM CDT
• Mesoscale Discussion 1543Jul 17, 8:58 PM CDT

000 
WWUS20 KWNS 171933
SEL7  
SPC WW 171933
IAZ000-ILZ000-MNZ000-MOZ000-WIZ000-180300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 607
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT MON JUL 17 2006

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

       CENTRAL AND EASTERN IOWA
       NORTHWEST ILLINOIS
       SOUTHEAST MINNESOTA
       NORTHEAST MISSOURI
       SOUTHWEST WISCONSIN

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

HAIL TO 2.5 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 105
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES EAST
NORTHEAST OF DUBUQUE IOWA TO 60 MILES WEST OF DES MOINES IOWA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 606...

DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ACROSS PORTIONS OF IA
THROUGH WI ALONG COLD FRONT AND RESIDUAL OUTFLOW BOUNDARIES. VERY
STRONG INSTABILITY WITH MLCAPE AROUND 4000 J/KG AND DEEP LAYER SHEAR
AROUND 30 KT WILL SUPPORT A SUPERCELL AND BOW ECHO STRUCTURES. VERY
LARGE HAIL AND DAMAGING WIND WILL BE POSSIBLE AS ACTIVITY MOVES SEWD
THE REMAINDER OF THIS AFTERNOON AND EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 30530.


...DIAL/THOMPSON

Severe Thunderstorm Watches in Iowa, 2006Severe Thunderstorm Watches in Illinois, 2006Severe Thunderstorm Watches in Wisconsin, 2006Every severe thunderstorm watch in 2006

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.