Tornado Watch 313

Issued

Jun 14, 2013, 3:37 PM CDT (20:37 UTC)

Expired

Jun 14, 2013, 9:34 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Omaha radar (KOAX), 105 km from the middle of the area, began a volume at 20:38 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

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1079Jun 14, 2:38 PM CDT
• Mesoscale Discussion 1080Jun 14, 3:10 PM CDT
• Mesoscale Discussion 1083Jun 14, 6:11 PM CDT

844 
WWUS20 KWNS 142043
SEL3  
SPC WW 142043
IAZ000-NEZ000-150300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 313
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT FRI JUN 14 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EXTREME WESTERN IOWA
  EASTERN NEBRASKA

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER
    POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF
NORFOLK NEBRASKA TO 25 MILES SOUTHEAST OF LINCOLN NEBRASKA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 312...

DISCUSSION...THUNDERSTORMS IN S CENTRAL NEB WILL CONTINUE TO SPREAD
NEWD TOWARD NE NEB THIS AFTERNOON...WHERE ADDITIONAL SURFACE-BASED
DEVELOPMENT WILL BE POSSIBLE NEAR THE TRIPLE POINT.  THE ENVIRONMENT
FROM THE TRIPLE POINT SEWD ACROSS ERN NEB IS CHARACTERIZED BY
BOUNDARY LAYER DEWPOINTS NEAR 70 F AND SURFACE TEMPERATURES
APPROACHING 90 F FROM THE SW...WHICH WILL CONTINUE TO WEAKEN
CONVECTIVE INHIBITION AND SUPPORT NEW STORM DEVELOPMENT. 
MEANWHILE...THE OAX VWP SHOWS A RELATIVELY LARGE CLOCKWISE TURNING
HODOGRAPH...WITH SUFFICIENT VERTICAL SHEAR FOR SUPERCELLS.  GIVEN
EFFECTIVE SRH NEAR 300 M2/S2...MLCAPE OF 3000-4000 J/KG...AND MLLCL
HEIGHTS NEAR 1250 M...A FEW TORNADOES AND ISOLATED VERY LARGE HAIL
WILL BE POSSIBLE WITH THE INITIALLY MORE DISCRETE STORMS.  LATER
THIS EVENING...SOME UPSCALE GROWTH IS EXPECTED INTO A SMALL
SEWD-MOVING MCS...WITH AN ATTENDANT RISK FOR DAMAGING GUSTS.

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 27020.


...THOMPSON

Tornado Watches in Nebraska, 2013Tornado Watches in Iowa, 2013Every tornado 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.