Alert archive / Nebraska / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 710

September 6, 2001Phillips County, Sedgwick County, Colorado; 21 counties in Kansas; 24 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Sep 6, 2001, 5:30 PM MDT for Phillips County, Sedgwick County, Colorado; 21 counties in Kansas; 24 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 6, 2001, 5:30 PM MDT (23:30 UTC)
Expired
Sep 6, 2001, 10:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center
All 47 counties

Phillips County, CO, Sedgwick County, CO, Cheyenne County, KS, Decatur County, KS, Finney County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Hamilton County, KS, Hodgeman County, KS, Kearny County, KS, Lane County, KS, Logan County, KS, Ness County, KS, Norton County, KS, Rawlins County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Wichita County, KS, Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 128 km from the middle of the area, began a volume at 23:34 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

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

IssuedProductOfficeCountiesLasted
Sep 6, 5:39 PM MDTSevere Thunderstorm WarningLBFGarden66 min
Sep 6, 6:13 PM MDTSevere Thunderstorm WarningGLDThomas47 min
Sep 6, 7:10 PM MDTSevere Thunderstorm WarningLBFGrant, Hooker65 min
Sep 6, 7:46 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick29 min
Sep 6, 8:02 PM MDTSevere Thunderstorm WarningLBFCherry58 min
Sep 6, 8:08 PM MDTSevere Thunderstorm WarningLBFChase, Perkins67 min
Sep 6, 8:14 PM MDTSevere Thunderstorm WarningLBFHooker46 min
Sep 6, 8:40 PM MDTSevere Thunderstorm WarningLBFThomas65 min
Sep 6, 8:51 PM MDTSevere Thunderstorm WarningLBFCherry54 min
Sep 6, 9:00 PM MDTSevere Thunderstorm WarningLBFBrown, Keya Paha60 min
Sep 6, 9:16 PM MDTSevere Thunderstorm WarningLBFBlaine59 min
Sep 6, 9:36 PM MDTSevere Thunderstorm WarningLBFLogan24 min
Sep 6, 9:50 PM MDTSevere Thunderstorm WarningLBFLincoln55 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.5 hours before the alert went out and 40 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 2001-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 421 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2001-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
421 J/kg
Mixed-layer CIN
-226 J/kg
Mixed-layer LCL
739 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
145 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 
WWUS9 KMKC 062331
SEL0  
MKC WW 062324
COZ000-KSZ000-NEZ000-070400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 710
STORM PREDICTION CENTER NORMAN OK
524 PM MDT THU SEP 6 2001

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

   NORTHEAST COLORADO                           
   WESTERN KANSAS                             
   WESTERN AND CENTRAL NEBRASKA                           

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 530 PM UNTIL
1000 PM MDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES WEST OF VALENTINE NEBRASKA TO
15 MILES SOUTHWEST OF GARDEN CITY KANSAS.

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 709...

DISCUSSION...THUDNERSTORMS EXPECTED TO INCREASE IN COVERAGE/
ITENSITY ACROSS WATCH AREA THIS EVENING AS LARGE SCALE FORCING
ENCOUNTERS AXIS OF MODERATE LOW LEVEL CONVERGENCE/STEEP BOUNDARY
LAYER LAPSE RATES AND AMPLE MOISTURE.  MAIN CONVECTIVE MODE SHOULD
BE MULTICELL CLUSTERS...WITH POSSIBLE BRIEF MID LEVEL ROTATION IN
THE STRONGER STORMS.  

AVIATION...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 500.  MEAN STORM
MOTION VECTOR 25025.

...CORFIDI

425,0995 374,0993 374,1021 425,1023

@RUKWBC	KDENWWUS9 KMKC 062331
SEL0  
MKC WW 062324
COZ000-KSZ000-NEZ000-070400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 710
STORM PREDICTION CENTER NORMAN OK
524 PM MDT THU SEP 6 2001

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

   NORTHEAST COLORADO                           
   WESTERN KANSAS                             
   WESTERN AND CENTRAL NEBRASKA                           

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 530 PM UNTIL
1000 PM MDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES WEST OF VALENTINE NEBRASKA TO
15 MILES SOUTHWEST OF GARDEN CITY KANSAS.

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 709...

DISCUSSION...THUDNERSTORMS EXPECTED TO INCREASE IN COVERAGE/
ITENSITY ACROSS WATCH AREA THIS EVENING AS LARGE SCALE FORCING
ENCOUNTERS AXIS OF MODERATE LOW LEVEL CONVERGENCE/STEEP BOUNDARY
LAYER LAPSE RATES AND AMPLE MOISTURE.  MAIN CONVECTIVE MODE SHOULD
BE MULTICELL CLUSTERS...WITH POSSIBLE BRIEF MID LEVEL ROTATION IN
THE STRONGER STORMS.  

AVIATION...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 500.  MEAN STORM
MOTION VECTOR 25025.

...CORFIDI

425,0995 374,0993 374,1021 425,1023

Nearby

Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Kansas, 2001Severe Thunderstorm Watches in Colorado, 2001Every severe thunderstorm watch in 2001

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.