Alert archive / Nebraska / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 320

May 22, 2002Woodbury County, Iowa; 6 counties in Kansas; 28 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2002, 4:15 PM CDT for Woodbury County, Iowa; 6 counties in Kansas; 28 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 22, 2002, 4:15 PM CDT (21:15 UTC)
Expired: May 22, 2002, 10:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 35 counties

Woodbury County, IA, Graham County, KS, Jewell County, KS, Osborne County, KS, Phillips County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Fillmore County, NE, Franklin County, NE, Hall County, NE, Hamilton County, NE, Kearney County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Platte County, NE, Polk County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Wayne County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 33 km from the middle of the area, began a volume at 21:18 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.

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 22, 6:35 PM CDT	Severe Thunderstorm Warning	GID	Phillips, Smith	55 min
May 22, 6:40 PM CDT	Severe Thunderstorm Warning	GID	Rooks	50 min
May 22, 6:46 PM CDT	Severe Thunderstorm Warning	GID	Clay, Nuckolls	59 min
May 22, 7:01 PM CDT	Tornado Warning	GID	Smith	44 min
May 22, 7:29 PM CDT	Severe Thunderstorm Warning	GID	Rooks	61 min
May 22, 7:37 PM CDT	Severe Thunderstorm Warning	GID	Jewell	38 min
May 22, 7:41 PM CDT	Severe Thunderstorm Warning	GID	Smith	49 min
May 22, 7:50 PM CDT	Severe Thunderstorm Warning	GID	Osborne	55 min
May 22, 8:27 PM CDT	Severe Thunderstorm Warning	GID	Rooks	48 min
May 22, 8:45 PM CDT	Severe Thunderstorm Warning	GID	Osborne	45 min
May 22, 9:00 PM CDT	Severe Thunderstorm Warning	GID	Thayer	60 min
May 22, 9:16 PM CDT	Severe Thunderstorm Warning	GID	Rooks	44 min
May 22, 9:20 PM CDT	Severe Thunderstorm Warning	GID	Jewell, Mitchell	55 min
May 22, 9:32 PM CDT	Severe Thunderstorm Warning	GID	Osborne	58 min
May 22, 9:56 PM CDT	Severe Thunderstorm Warning	GID	Smith	64 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.3 hours before the alert went out and 178 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 222049
SEL0  
SPC WW 222043
IAZ000-KSZ000-NEZ000-230300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 320
STORM PREDICTION CENTER NORMAN OK
343 PM CDT WED MAY 22 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   EXTREME WESTERN IOWA                               
   NORTHERN KANSAS                             
   EASTERN NEBRASKA                           

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 415 PM UNTIL
1000 PM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF HILL CITY
KANSAS TO 20 MILES NORTH OF SIOUX CITY IOWA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 319...

DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP ALONG DRYLINE DURING
THE NEXT FEW HOURS. INSTABILITY WILL BE INCREASING AND SUFFICIENT
SHEAR FOR STORMS TO PRODUCE LARGE HAIL AND SEVERE WINDS.  

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.  MEAN STORM MOTION
VECTOR 25025.

...IMY

424,0952 391,0982 391,1000 424,0971

Nearby

Severe Thunderstorm Watches in Nebraska, 2002 Severe Thunderstorm Watches in Kansas, 2002 Severe Thunderstorm Watches in Iowa, 2002 Every severe thunderstorm watch in 2002

Sources

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.