Tornado Watch 479

Issued

Aug 31, 2014, 3:31 PM CDT (20:31 UTC)

Expired

Aug 31, 2014, 9:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Omaha radar (KOAX), 55 km from the middle of the area, began a volume at 20:33 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

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

60%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1645Aug 31, 2:20 PM CDT
• Mesoscale Discussion 1651Aug 31, 6:07 PM CDT

320 
WWUS20 KWNS 312032
SEL9  
SPC WW 312032
IAZ000-KSZ000-NEZ000-SDZ000-010200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 479
NWS STORM PREDICTION CENTER NORMAN OK
335 PM CDT SUN AUG 31 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  WESTERN IOWA
  NORTH CENTRAL KANSAS
  EASTERN NEBRASKA
  EXTREME SOUTHEAST SOUTH DAKOTA

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 335 PM UNTIL
  900 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
    TO 2.5 INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF
SPENCER IOWA TO 45 MILES SOUTHWEST OF CONCORDIA KANSAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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.

&&

DISCUSSION...SCATTERED THUNDERSTORMS ARE WILL DEVELOP DURING THE
NEXT FEW HOURS ALONG A SURFACE BOUNDARY EXTENDING FROM NORTH CENTRAL
KS INTO EASTERN NEB AND WESTERN IA.  PARAMETERS APPEAR FAVORABLE FOR
A FEW SUPERCELL STORMS IN THIS REGION...CAPABLE OF VERY LARGE
HAIL...DAMAGING WINDS...AND PERHAPS A FEW TORNADOES.

AVIATION...TORNADOES AND 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
550. MEAN STORM MOTION VECTOR 25030.


...HART

Tornado Watches in Nebraska, 2014Tornado Watches in Iowa, 2014Tornado Watches in Kansas, 2014Every tornado watch in 2014

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.