Tornado Watch 499

Issued

Aug 22, 2015, 3:48 PM CDT (20:48 UTC)

Expired

Aug 23, 2015, 12:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Omaha radar (KOAX), 57 km from the middle of the area, began a volume at 20:47 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

30%

Ten or more severe wind reports

95%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1731Aug 22, 2:13 PM CDT
• Mesoscale Discussion 1733Aug 22, 2:55 PM CDT
• Mesoscale Discussion 1737Aug 22, 6:21 PM CDT
• Mesoscale Discussion 1740Aug 22, 8:49 PM CDT
• Mesoscale Discussion 1741Aug 22, 11:53 PM CDT

252 
WWUS20 KWNS 222047
SEL9  
SPC WW 222047
IAZ000-KSZ000-MOZ000-NEZ000-230500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 499
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT SAT AUG 22 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHERN AND WESTERN IOWA
  NORTHERN AND EASTERN KANSAS
  WESTERN AND NORTHERN MISSOURI
  SOUTHERN AND EASTERN NEBRASKA

* EFFECTIVE THIS SATURDAY AFTERNOON FROM 340 PM UNTIL MIDNIGHT
  CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
  WIDESPREAD DAMAGING WINDS EXPECTED WITH ISOLATED SIGNIFICANT
    GUSTS TO 80 MPH POSSIBLE
  WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
    EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...THUNDERSTORMS...INCLUDING A FEW LONGER-LIVED
SUPERCELLS...EXPECTED TO FORM OVER EASTERN NEB AND WESTERN IA OVER
THE NEXT FEW HOURS. THESE STORMS MAY PRODUCE A FEW TORNADOES...IN
ADDITION TO VERY LARGE HAIL AND LOCALLY DAMAGING WIND...AS THEY
MOVE/DEVELOP GENERALLY EASTWARD. THE STORMS LIKELY WILL BE JOINED BY
ADDITIONAL ACTIVITY FORMING SOUTHWARD INTO PARTS OF NORTHERN KS AND
NW MO A BIT LATER THIS EVENING. THE STORMS LIKELY WILL MERGE INTO
ONE OR TWO LARGE CLUSTERS. THESE COULD BE ACCOMPANIED BY A
CONTINUING RISK FOR SEVERE WIND...HAIL...AND ISOLATED TORNADOES AS
THEY MOVE GENERALLY S OR SE ACROSS NE KS...NW MO...AND SRN IA
THROUGH LATE TONIGHT.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES EAST NORTHEAST OF
DENISON IOWA TO 30 MILES SOUTHWEST OF MANHATTAN 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 497...WW 498...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 29025.


...CORFIDI

Tornado Watches in Kansas, 2015Tornado Watches in Iowa, 2015Tornado Watches in Nebraska, 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; radar from the NEXRAD Level II archive.