Tornado Watch 171

Issued

Apr 14, 2012, 6:27 PM CDT (23:27 UTC)

Expired

Apr 15, 2012, 3:50 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Particularly dangerous situation

Yes

Largest hail expected

2 in

Strongest gust expected

60 kt

The Grand Island radar (KUEX), 74 km from the middle of the area, began a volume at 23:30 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

70%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

60%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 532Apr 14, 4:47 PM CDT
• Mesoscale Discussion 534Apr 14, 6:57 PM CDT
• Mesoscale Discussion 543Apr 15, 3:25 AM CDT

097 
WWUS20 KWNS 142328
SEL1
SPC WW 142328
NEZ000-150700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 171
NWS STORM PREDICTION CENTER NORMAN OK
630 PM CDT SAT APR 14 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       CENTRAL AND SOUTHEAST NEBRASKA

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 630 PM
UNTIL 200 AM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 2 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF KEARNEY
NEBRASKA TO 40 MILES SOUTH OF OMAHA NEBRASKA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU1).

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 166...WW 167...WW
169...WW 170...

DISCUSSION...SURFACE LOW N OF GLD WILL DEVELOP NEWD INTO CNTRL NEB
TONIGHT WITH AN ASSOCIATED WARM FRONT/OUTFLOW BOUNDARY LIFTING NWD
THROUGH S-CNTRL/SERN NEB.  THE RETREAT OF THIS BOUNDARY WILL
COINCIDE WITH THE WRN EXTENSION OF A 50+ KT SLY LLJ WHICH WILL
ENHANCED VERTICAL SHEAR AND AIR MASS DESTABILIZATION.  AS
SUCH...ENVIRONMENT IS EXPECTED TO REMAIN SUPPORTIVE OF SUPERCELLS
CAPABLE OF TORNADOES /SOME SIGNIFICANT/ AND LARGE HAIL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24035.


...MEAD

Tornado Watches in Nebraska, 2012Every tornado watch in 2012

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.