Severe Thunderstorm Watch 113

Issued

Apr 17, 2013, 9:14 AM CDT (14:14 UTC)

Expired

Apr 17, 2013, 7:00 PM CDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

50 kt

The Quad Cities radar (KDVN), 112 km from the middle of the area, began a volume at 14:17 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 489Apr 17, 8:49 AM CDT
• Mesoscale Discussion 494Apr 17, 1:33 PM CDT
• Mesoscale Discussion 496Apr 17, 3:04 PM CDT
• Mesoscale Discussion 499Apr 17, 4:19 PM CDT
• Mesoscale Discussion 504Apr 17, 6:46 PM CDT

694 
WWUS20 KWNS 171416
SEL3  
SPC WW 171416
IAZ000-ILZ000-MOZ000-LMZ000-172200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 113
NWS STORM PREDICTION CENTER NORMAN OK
915 AM CDT WED APR 17 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  SOUTHERN IOWA
  NORTHERN ILLINOIS
  NORTHERN MISSOURI
  LAKE MICHIGAN

* EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 915 AM
  UNTIL 500 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF
LAMONI IOWA TO 50 MILES EAST NORTHEAST OF MARSEILLES ILLINOIS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

DISCUSSION...VIGOROUS THUNDERSTORM DEVELOPMENT IS EXPECTED TO
PERSIST ALONG A WARM FRONTAL ZONE EXTENDING ACROSS THE WATCH
AREA...INTO AND THROUGH THE AFTERNOON HOURS.  SEVERE HAIL IS
PROBABLE IN STRONGER CELLS.  THE EVOLUTION OF AN INCREASINGLY
ORGANIZED CLUSTER OF STORMS IS POSSIBLE BY THIS
AFTERNOON...ACCOMPANIED BY AN INCREASING RISK FOR POTENTIALLY
DAMAGING WIND GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26040.


...KERR

Severe Thunderstorm Watches in Illinois, 2013Severe Thunderstorm Watches in Iowa, 2013Severe Thunderstorm Watches in Missouri, 2013Every severe thunderstorm watch in 2013

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.