Tornado Watch 494

Issued

Aug 18, 2015, 1:35 PM CDT (18:35 UTC)

Expired

Aug 18, 2015, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1704Aug 18, 12:49 PM CDT
• Mesoscale Discussion 1709Aug 18, 3:53 PM CDT
• Mesoscale Discussion 1713Aug 18, 8:00 PM CDT

905 
WWUS20 KWNS 181834
SEL4  
SPC WW 181834
IAZ000-ILZ000-MOZ000-WIZ000-190300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 494
NWS STORM PREDICTION CENTER NORMAN OK
130 PM CDT TUE AUG 18 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EASTERN IOWA
  WESTERN AND NORTHERN ILLINOIS
  FAR NORTHEAST MISSOURI
  SOUTHERN AND WESTERN WISCONSIN

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

SUMMARY...THUNDERSTORMS EXPECTED TO DEVELOP / INCREASE IN COVERAGE
AND STRENGTH OVER WATCH AREA THROUGH EARLY TONIGHT. SOME MAY BECOME
SUPERCELLS CAPABLE OF TORNADOES...IN ADDITION TO LOCALLY DAMAGING
WIND AND PERHAPS AN INSTANCE OR TWO OF MARGINALLY SEVERE HAIL.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 5 MILES NORTHWEST OF CAMP
DOUGLAS WISCONSIN TO 25 MILES SOUTH SOUTHWEST OF PEORIA ILLINOIS.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 493...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 21030.


...CORFIDI

Tornado Watches in Illinois, 2015Tornado Watches in Iowa, 2015Tornado Watches in Wisconsin, 2015Every tornado watch in 2015

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.