Tornado Watch 231

Issued

May 27, 2013, 4:49 PM CDT (21:49 UTC)

Expired

May 27, 2013, 11:26 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

4 in

Strongest gust expected

70 kt

The Grand Island radar (KUEX), 64 km from the middle of the area, began a volume at 21:50 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

80%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

95%

One or more hailstones of 2 inches or more

80%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 819May 27, 2:00 PM CDT
• Mesoscale Discussion 820May 27, 3:23 PM CDT
• Mesoscale Discussion 823May 27, 5:36 PM CDT
• Mesoscale Discussion 827May 27, 6:53 PM CDT
• Mesoscale Discussion 830May 27, 8:18 PM CDT
• Mesoscale Discussion 831May 27, 8:39 PM CDT
• Mesoscale Discussion 832May 27, 9:07 PM CDT
• Mesoscale Discussion 833May 27, 10:23 PM CDT
• Mesoscale Discussion 834May 27, 11:19 PM CDT

908 
WWUS20 KWNS 272150
SEL1  
SPC WW 272150
KSZ000-NEZ000-280500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 231
NWS STORM PREDICTION CENTER NORMAN OK
450 PM CDT MON MAY 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN KANSAS
  SOUTHERN NEBRASKA

* EFFECTIVE THIS MONDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT CDT.

* PRIMARY THREATS INCLUDE...
  NUMEROUS TORNADOES LIKELY WITH SEVERAL INTENSE TORNADOES
    POSSIBLE
  NUMEROUS VERY LARGE HAIL EVENTS TO 4 INCHES IN DIAMETER LIKELY
  SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF
HASTINGS NEBRASKA TO 55 MILES SOUTHWEST OF CONCORDIA KANSAS.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 227...WW 228...WW
229...WW 230...

DISCUSSION...RAPID SUPERCELL DEVELOPMENT IS UNDERWAY IN A ZONE OF
LOW-LEVEL WAA ACROSS S CENTRAL NEB...AND ADDITIONAL SUPERCELLS
SHOULD FORM JUST NE OF THE TRIPLE POINT IN N CENTRAL KS WHERE
LOW-LEVEL CONVERGENCE IS MAXIMIZED ALONG THE INSTABILITY AXIS...AS
CONVECTIVE INHIBITION WEAKENS.  THE COMBINATION OF MLCAPE OF
3500-4500 J/KG...EFFECTIVE BULK SHEAR OF 40-50 KT...EFFECTIVE SRH OF
250-400 M2/S2...AND BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S WILL
SUPPORT THE RISK OF A FEW STRONG TORNADOES AND VERY LARGE HAIL. 
LATER THIS EVENING INTO TONIGHT...THE STORMS WILL LIKELY CONGEAL
INTO AN MCS AND MOVE EWD/ESEWD ALONG THE RESIDUAL OUTFLOW/WARM FRONT
INTO NE KS/SE NEB.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 27020.


...THOMPSON

Tornado Watches in Nebraska, 2013Tornado Watches in Kansas, 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.