Tornado Watch 482

Issued

Aug 31, 2014, 7:12 PM CDT (00:12 UTC)

Expired

Sep 1, 2014, 12:47 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Des Moines radar (KDMX), 56 km from the middle of the area, began a volume at 00:12 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

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1651Aug 31, 6:07 PM CDT
• Mesoscale Discussion 1652Aug 31, 9:09 PM CDT

475 
WWUS20 KWNS 010015
SEL2  
SPC WW 010015
IAZ000-MOZ000-NEZ000-010700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 482
NWS STORM PREDICTION CENTER NORMAN OK
715 PM CDT SUN AUG 31 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND SOUTHERN IOWA
  NORTHWESTERN MISSOURI
  EXTREME SOUTHEASTERN NEBRASKA

* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 715 PM
  UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75
    MPH POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES NORTH OF DES MOINES
IOWA TO 40 MILES EAST OF FALLS CITY NEBRASKA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU2).

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 479...WW 480...WW 481...

DISCUSSION...MESSY MIX OF SUPERCELLS...MULTICELLS AND QUASI-LINEAR
TSTM SEGMENTS SHOULD MOVE GENERALLY W-E ACROSS WW AREA THIS
EVENING...OFFERING SOME RISK FOR EACH SEVERE HAZARD.  RELATIVELY
MAXIMIZED TORNADO POTENTIAL...WHETHER FROM SUPERCELLS OR QLCS
CIRCULATIONS...WOULD BE OVER PORTIONS WRN/CENTRAL IA...NEAR AND N OF
OLD OUTFLOW/DIFFERENTIAL-HEATING BOUNDARY -- WHERE RELATIVELY BACKED
FLOW...RELATED HODOGRAPH ENHANCEMENT...RICH BOUNDARY-LAYER
MOISTURE...AND LOW LCL ARE EXPECTED FOR A FEW HOURS BENEATH
STRENGTHENING LLJ.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 26025.


...EDWARDS

Tornado Watches in Iowa, 2014Tornado Watches in Missouri, 2014Tornado Watches in Nebraska, 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.