Alert archive / Nebraska / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 253, NWS North Platte, NE

August 4, 2003Brown County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 4, 2003, 9:09 PM CDT for Brown County, Nebraska. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 4, 2003, 9:09 PM CDT (02:09 UTC)
Expired: Aug 4, 2003, 10:15 PM CDT
In force: 66 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Brown County, NE

The radar

The North Platte radar (KLNX), 91 km from the middle of the area, began a volume at 02:13 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.2 hours before the alert went out and 177 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: 2097 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2295 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

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

818 
WUUS53 KLBF 050209
SVRLBF
NEC017-050315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
909 PM CDT MON AUG 4 2003

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BROWN COUNTY IN NORTH CENTRAL NEBRASKA

* UNTIL 1015 PM CDT

* AT 908 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM 14 MILES NORTH OF
  AINSWORTH...OR ABOUT 8 MILES SOUTHWEST OF SPRINGVIEW...MOVING
  SOUTHEAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  8 MILES NORTH OF LONG PINE AROUND 1015 PM CDT

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 WHICH MAY CAUSE 
SERIOUS INJURY AND SEVERE DAMAGE TO PROPERTY. MOVE TO A STURDY 
BUILDING AND STAY AWAY FROM WINDOWS.

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

LAT...LON 4279 10018 4248 10015 4251 9970 4269 9970

$$
SPRINGER

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 4, 2:33 PM CDT, 6 hours 36 minutes earlier.

Area forecast discussion, Aug 4, 2:33 PM CDT, 6 hours 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
233 PM CDT MON AUG 4 2003

SHORTWAVE AT 18Z EXTENDS FROM EXTREME WRN SD INTO SERN WY. RESULTANT
DRYING VERY EVIDENT ON WV IMAGERY. BOTH THE ETA AND GFS AGREE ON
MCS DEVELOPING FROM ERN KS INTO SRN MO TONIGHT WITH A SECOND AREA
SOUTHEAST THROUGH THE MISSOURI VALLEY. MODELS NOT DEVELOPING PRECIP
INVO SFC TROUGH AND DRYLINE IN WRN NEBRASKA LATE THIS AFTERNOON INTO
THIS EVENING. APPROACHING WAVE...CONVERGENCE ALONG TROUGH AND SOME
REMAINING BOUNDARIES FROM A.M. CONVECTION SUPPORT SCATTERED TSRA BY
LATE THIS AFTERNOON GENERALLY NEAR AN OGALLALA TO CODY LINE. IN FACT
ALREADY A LINE OF TCU GOING UP IN NWRN KS INTO SWRN NEBR AT 18Z.
GOOD MOISTURE AVBL EAST OF ANW TO BBW WHERE PW VALUES ABOVE 1.5
INCHES. SOME LOCALLY HEAVY RAIN PSBL IN FAR ERN CWFA THIS EVENING.
ALL CONVECTION SHOULD MOVE OUT OF ERN CWFA SOON AFTER MIDNIGHT.

A SLIGHT COOLDOWN TUESDAY AS H85 WINDS TURN TO THE NORTH. UPPER
RIDGE BUILDS INTO REGION WITH TEMPS RISING INTO THE MID AND UPPER
90S. WILL GO DRY THROUGH THE PERIOD WHEN STORM TRACK ACROSS
MONTANA-NORTH DAKOTA.

EXTENDED DISCUSSION...THE LATEST GFS CAME IN MUCH DIFFERENTLY THAN
PREVIOUS RUN AND LATEST EUROPEAN. WILL FAVOR PREVIOUS RUN AND KEEP
GOING FORECAST HOT AND DRY FRIDAY THROUGH MONDAY.
.LBF...NONE.

KAR

Hazardous weather outlook, Aug 4, 3:30 PM CDT, 5 hours 39 minutes before

NEZ004>010-022>029-035>038-056>059-069>071-094-051030-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
330 PM CDT MON AUG 4 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND NORTH CENTRAL
NEBRASKA.

.DAY ONE...TONIGHT

THERE IS A SLIGHT CHANCE FOR SEVERE THUNDERSTORM DEVELOPMENT ALONG A
DRY LINE WHICH IS LOCATED NEAR A NORTH PLATTE TO VALENTINE LINE.
AHEAD OF THE DRYLINE SURFACE DEW POINT TEMPERATURES RANGE IN THE MID
TO UPPER 60S WITH SOUTHERLY WINDS.  BEHIND THIS LINE ACROSS WESTERN
NEBRASKA WINDS ARE TURNING WEST AND DEW POINTS ARE FALLING THROUGH
THE 50S.

SEVERE WEATHER POTENTIAL MAY BE LIMITED BY THE WEAK WIND FIELDS WITH
MID LEVEL WINDS LESS THAN 20 KNOTS.  HOWEVER GIVEN THE VERY UNSTABLE
AIRMASS AND THE TURNING OF THE WINDS WITH HEIGHT...LARGE HAIL AND
TORNADOES ARE POSSIBLE.  AS THE DRIER AIR ADVANCES LATE THIS
AFTERNOON AND EVENING WINDS WILL BECOME MORE WESTERLY STORM TYPE
WILL FAVOR THE DEVELOPMENT OF DAMAGING THUNDERSTORM WINDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
TUESDAY THROUGH SUNDAY NO RAINFALL IS EXPECTED AS TEMPERATURES TREND
UPWARDS. THE UPPER RIDGE STRENGTHENS AND BUILDS EAST TUESDAY WITH
AN ISOLATED CHANCE THAT THUNDERSTORMS MAY FORM LATE IN THE DAY
WEDNESDAY. PIECES OF ENERGY WILL EJECT ACROSS THE PLAINS ON
WEDNESDAY AS THE LOW LEVEL JET STRENGTHENS OVERNIGHT. HOWEVER AS
THE UPPER RIDGE STRENGTHENS THE STRONGER DYNAMICS WILL SHIFT
NORTHWARD WITH NO THUNDERSTORMS FORECASTED THROUGH SUNDAY.
.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT.
SPOTTER ACTIVATION IS NOT ANTICIPATED TUESDAY THROUGH SUNDAY.

HIRSCH

In the hours before

Local storm report, Aug 4, 8:09 PM CDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
0809 PM CDT MON AUG 04 2003

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

0805 PM    SPARKS                    NE   0.88 IN HAIL
08/04/03   CHERRY

MB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 7:35 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Keya Paha	55 min
Aug 4, 8:28 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	62 min
Aug 4, 9:39 PM CDT	Severe Thunderstorm Warning	LBF	Rock	66 min
Aug 4, 10:35 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	55 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2003 Every severe thunderstorm warning in 2003

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.