Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 260, NWS North Platte, NE

August 2, 2001Garfield County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 2, 2001, 4:29 AM CDT for Garfield County, Nebraska. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 2, 2001, 4:29 AM CDT (09:29 UTC)
Expired: Aug 2, 2001, 5:00 AM CDT
In force: 31 min
Issued by: NWS North Platte, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Garfield County, NE

What was reported inside it

Time	Report	Where	Remark
Aug 2, 4:45 AM CDT	Hail 1.5	Burwell, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 9.5 hours before the alert went out and 168 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: 1750 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLBF 020934
SVRLBF

NEC071-021000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
429 AM CDT THU AUG 2 2001

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN GARFIELD COUNTY IN NORTH CENTRAL NEBRASKA

* UNTIL 500 AM CDT

* AT 426 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EAST CENTRAL GARFIELD COUNTY...OR ABOUT 19
  MILES NORTHEAST OF BURWELL...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...

  OVER FARM AND RANGELANDS OF NORTHEASTERN GARFIELD COUNTY   

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER IN A SMALL
INTERIOR ROOM AWAY FROM WINDOWS. A BASEMENT OFFERS THE BEST
PROTECTION.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING
WINDS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4186 9897 4186 9879 4208 9877 4208 9899

$$
JWS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 2, 2:03 AM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Aug 2, 2:03 AM CDT, 2 hours 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
203 AM CDT THU AUG 2 2001

FORECAST CHALLENGE WILL BE POPS TODAY AND TONIGHT...

VORT MAX CURRENTLY IN NERN COLORADO LARGELY RESPONSIBLE FOR MCS INTO
SWRN NEBRASKA. MODELS PICKED UP ON THIS VORT MAX WELL AND MOVE IT
RATHER SLOWLY BENEATH THE UPPER RIDGE TODAY. IMMEDIATE CONCERN MAY BE
FLASH FLOOD THREAT IN LINCOLN INTO CUSTER COUNTY THE NEXT 6 HRS WITH
FFG VALUES LOW DUE TO HEAVY RAINFALL THE PAST TWO NIGHTS.

IN THE WAKE OF THE MCS CURRENTLY MOVING THROUGH SWRN NEBRASKA...THE
TIMING AND POSITION OF PRECIPITATION MAIN CONCERN TODAY AND TONIGHT
AS MAIN FRONTAL BOUNDARY REMAINS NEARLY STATIONARY. CURRENT THINKING
IS THAT MCS SHOULD DEVELOP A MESOHIGH OVER NEBRASKA TO HELP PUSH THE
BOUNDARY FURTHER SOUTH INTO KANSAS.

WILL USE A BLEND OF THE AVN AND ETA BUT WILL FAVOR THE ETA FOR ITS
MORE SOUTHERN POSITION OF VORT MAX AND QPFS THROUGH 24HRS. THE ETA
VERIFYING BEST WITH MSL PRESSURE COMPARED TO SURFACE ANALYSIS.

TODAY...MODELS INDICATE 1000-500MB RH AOA 60 PERCENT OVER MOST OF
CWFA. SUBSIDENCE IN THE WAKE OF MCS SHOULD YIELD AT LEAST PARTLY
SUNNY SKIES...ESPECIALLY OVER THE SOUTH. GUIDANCE TEMPS CLOSE AND
AGREE WELL WITH 40KM ETA NUMBERS. WITH DWPTS FCST TO BE LOWER 60S
NORTHWEST TO LOWER 70S SOUTHEAST...THIS COMBINED WITH SE WINDS AND
SOME CLOUDINESS SHOULD HOLD DOWN HIGHS A BIT TO 85 TO 90 MOST AREAS.
AFTER ONGOING MCS EXITS THE CWFA...WILL KEEP POPS LOW AT 20 PERCENT
ASSUMING SOME SUBSIDENCE PERSISTS THROUGHOUT THE DAY...VORT MAX
SLOWLY MOVING THROUGH...LINGERING BOUNDARIES...AND CWFA NORTH OF
FRONTAL BOUNDARY JUSTIFY POPS.

TONIGHT...LOOKS LIKE ONE LAST CHANCE FOR ORGANIZED CONVECTION BEFORE
DRY CONDITION SETTLE INTO NEBRASKA. ETA KEYING IN ON MCS DEVELOPING
OVER CENTRAL NEBRASKA THIS AFTERNOON AND INTO SOUTH CENTRAL NEBRASKA
TONIGHT. FELL THIS IS OVERDONE AND WILL ONLY KEEP LOW POPS SOUTHEAST
CWFA NEAR THE SURFACE BOUNDARY WHERE DEWPOINTS MAY POOL ABOVE 70 AND
BEST THETA-E ADVECTION RESIDES. IN ADDITION AS UPPER RIDGE BUILDS
INTO COLORADO...BEST CHCS FOR CONVECTION WILL SHIFT TO OUR EAST AND
SOUTHEAST.

FRIDAY...UPPER RIDGE BECOMES A DOMINANT PLAYER OVER THE REGION AS AS
WAA SETS UP ACROSS NEBRASKA. SFC BOUNDARY REMAINS NEAR THE NEBR-KS
BORDER. LOOKS TO BE VERY UNSTABLE WITH SBCAPES ABOVE 300J/KG EAST OF
LBF AND VTN. 40KM ETA SOUNDING INDICATES CAPPED ABOVE 800MB THOUGH.
ALSO NO VORT MAXES EXPECTED TO ROTATE INTO AREA UNDER UPPER RIDGE.
SOUTHEAST WIND FLOW CONTINUES WITH READINGS AROUND 90 ON FRIDAY WITH
BETTER HEATING AND LESS CLOUDS.

FRIDAY NIGHT...RELATIVELY HIGH DEWPOINTS PERSIST OVER WRN NEBRASKA TO
MINIMIZE DIURNAL SWING IN TEMPS. OTHERWISE MOSTLY CLEAR AND DRY AS
UPPER RIDGE AXIS ALIGNS ITSELF FROM NEW MEXICO THROUGH NEBRASKA.

NO CHANGES ANTICIPATED IN THE EXTENDED AS 01/00 MRF IN CLOSE
AGREEMENT WITH LATEST AVN OUT TO 120 HRS WITH UPPER RIDGE CENTER IN
WYOMING AND MAINLY DRY SATURDAY THROUGH MONDAY. HIGHS MAINLY IN THE
90S.

.LBF...NONE.

ROBERG

In the hours before

Special weather statement, Aug 1, 11:04 PM CDT, 5 hours 25 minutes before

NEZ004>010-022>029-035>038-056>059-069>071-020500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1104 PM CDT WED AUG 1 2001

...SEVERE THUNDERSTORM WATCH FOR SOUTHWESTERN NEBRASKA HAS BEEN
ALLOWED TO EXPIRE...

SEVERE THUNDERSTORM WATCH NUMBER 649...PREVIOUSLY VALID FOR
SOUTHWESTERN NEBRASKA...HAS BEEN ALLOWED TO EXPIRE. OVERNIGHT...
THUNDERSTORMS WILL CONTINUE TO MOVE INTO PORTIONS OF WESTERN AND
SOUTHWESTERN NEBRASKA AND SHOULD REMAIN BELOW SEVERE LEVELS. GUSTY
WINDS...SMALL HAIL AND HEAVY RAIN WILL BE THE MAIN THREAT FROM THESE
THUNDERSTORMS INTO THE EARLY MORNING HOURS.

CLB

Local storm report, Aug 2, 12:48 AM CDT, 3 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE, NE
1248 AM CDT THU AUG 2 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1242 AM    4 S SUTHERLAND            NE   65 MPH TSTM WIND GUST
08/02/01   LINCOLN                        THUNDERSTORM WIND GUST
                                          MEASURED AT NPPD POWER
                                          PLANTREPORTED BY SPOTTERS

CLB

Local storm report, Aug 2, 1:23 AM CDT, 3 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE, NE
123 AM CDT THU AUG 2 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0117 AM    2 E NORTH PLATTE          NE   64 MPH TSTM WIND GUST
08/02/01   LINCOLN                        THUNDERSTORM WIND GUST
                                          MEASURED AT THE NORTH
                                          PLATTE REGIONAL AIRPORT

CLB

Special weather statement, Aug 2, 4:02 AM CDT, 27 minutes before

NEZ035>038-057>059-069>071-020930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
402 AM CDT THU AUG 2 2001

...SEVERE THUNDERSTORM WATCH FOR ARTHUR...MCPHERSON...LOGAN...
KEITH...LINCOLN...CUSTER...PERKINS...CHASE...HAYES...AND FRONTIER
COUNTIES HAS BEEN ALLOWED TO EXPIRE...

SEVERE THUNDERSTORM WATCH NUMBER 650 HAS BEEN ALLOWED TO EXPIRE.
THUNDERSTORMS HAVE MOVED OUT OF THE WATCH AREA AND THUNDERSTORMS ARE
NO LONGER ANTICIPATED.

ROBERG

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 11:24 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	66 min
Aug 1, 11:30 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Keith	60 min
Aug 2, 12:28 AM CDT	Severe Thunderstorm Warning	LBF	Lincoln	62 min
Aug 2, 1:15 AM CDT	Severe Thunderstorm Warning	LBF	Lincoln	60 min
Aug 2, 1:49 AM CDT	Severe Thunderstorm Warning	LBF	Custer, Logan	56 min
Aug 2, 4:43 AM CDT	Severe Thunderstorm Warning	LBF	Holt, Wheeler	62 min
Aug 2, 5:14 AM CDT	Severe Thunderstorm Warning	LBF	Boyd	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2001 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.