Alert archive / Nebraska / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 247, NWS North Platte, NE

August 1, 2003Keith County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 1, 2003, 8:04 PM MDT for Keith County, Nebraska. It was in force for 56 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 1, 2003, 8:04 PM MDT (02:04 UTC)
Expired: Aug 1, 2003, 9:00 PM MDT
In force: 56 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Keith County, NE

The radar

The North Platte radar (KLNX), 131 km from the middle of the area, began a volume at 02:07 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 1, 5:45 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.1 hours before the alert went out and 99 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: 2471 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1629 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -4.5

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLBF 020204
SVRLBF
NEC101-020300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
803 PM MDT FRI AUG 1 2003

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL KEITH COUNTY IN SOUTHWEST NEBRASKA

* UNTIL 900 PM MDT

* AT 757 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM 12 MILES WEST OF
  BRULE...OR ABOUT 6 MILES NORTH OF BIG SPRINGS...MOVING EAST AT 25
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  OVER BRULE AROUND 825 PM MDT
  7 MILES SOUTH OF OGALLALA AROUND 845 PM MDT
  9 MILES SOUTH OF ROSCOE AROUND 855 PM MDT

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 4129 10201 4104 10199 4104 10148 4136 10143

$$
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 1, 2:00 PM MDT, 6 hours 4 minutes earlier.

Area forecast discussion, Aug 1, 2:00 PM MDT, 6 hours 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
300 PM CDT FRI AUG 1 2003

...FORECAST CONCERN...SUN-MON RAIN CHANCE AND TEMPS...

PESKY AREA OF MID LEVEL FRONTOGENESIS AND STEEP LAPSE RATES IS
SLOWLY MOVING SE. AN ISOLATED TSRA IS POSSIBLE SOUTHEAST THIS
EVENING.

NEXT FCST CONCERN IS SUN-MONDAY WITH RICH MOISTURE FLOWING NORTH
FROM TEXAS AND NORTHEAST FROM THE SW U.S.. OBVIOUS TROPICAL INVASION
IS UNDERWAY AS THE DOG DAYS OF SUMMER BEGIN.  ETA PROGS PWS NEAR
1.40 INCHES WITH MID LEVEL MOISTURE COMBINING TO PRODUCE K INDEX OF
40 TO 47. VERY GOOD THETA E RIDGE SETS UP.  IF STORMS CAN FIRE SUNDAY
ACROSS THE HIGH PLAINS SUNDAY...SIGNIFICANT RAIN COULD DEVELOP.
MODELS ARE QUIET HOWEVER AND FCST IS THAT THE ATM WILL NOT HANDLE
THIS MOISTURE ADVECTION BUT BURST INTO A BATCH OF LATE AFTN/LATE
EVENING CONVECTION.  MONDAY...GOOD SHORT WAVE MOVES THROUGH THE
FLATTENING RIDGE.  CONVECTION MORE CERTAIN.

REST OF FCST IS TEMPS...MRF SHOWS AN IMPRESSIVE HEAT WAVE SETTING UP
AFTER MONDAY.  500 HEIGHTS RISE TO 599 DM.

.LBF...NONE.

CDC

Hazardous weather outlook, Aug 1, 6:32 PM MDT, 1 hour 32 minutes before

NEZ004>010-022>029-035>038-056>059-069>071-094-021030-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
732 PM CDT FRI AUG 1 2003

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

.DAY ONE...TODAY

SEVERE THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE ACROSS PORTIONS OF
THE EASTERN NEBRASKA PANHANDLE INTO PORTIONS OF SOUTHWEST NEBRASKA
THROUGH THE EVENING HOURS. THE AREA OF GREATEST CONCERN WILL BE
SOUTH OF HIGHWAY 2...ALONG AND WEST OF HIGHWAY 61. STRONG TO SEVERE
STORMS MOVING EAST OUT OF THE HIGH PLAINS OF COLORADO AND THE
WESTERN NEBRASKA PANHANDLE WILL ENCOUNTER STRONG INSTABILITY OVER
THE RISK AREA AND WILL BE CAPABLE OF PRODUCING LARGE HAIL AND WIND
GUSTS OVER 58 MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A CHANCE OF THUNDERSTORMS OVERNIGHT SUNDAY INTO MONDAY.
THE RIDGE RESPONSIBLE FOR DRY CONDITIONS ON SATURDAY AND
SUNDAY...WILL BEGIN TO BREAK DOWN ACROSS THE CENTRAL ROCKIES LATE
SUNDAY. WITH A MORE WESTERLY COMPONENT TO THE MID LEVEL
WIND...CONVECTION ACROSS THE CENTRAL ROCKIES WILL BE ABLE TO REACH
WESTERN AND NORTH CENTRAL NEBRASKA OVERNIGHT ON SUNDAY AND MONDAY.
BY MONDAY...MORE FAVORABLE CONDITIONS AT THE SURFACE...AS WELL AS
ALOFT...WILL DEVELOP. AT THIS TIME...THERE IS A SLIGHT RISK OF
SEVERE THUNDERSTORMS ACROSS NORTHWESTERN PORTIONS OF THE OUTLOOK
AREA...MAINLY SHERIDAN AND WESTERN CHERRY COUNTY. FOR THE REMAINDER
OF WESTERN AND NORTH CENTRAL NEBRASKA...NO SEVERE WEATHER IS
ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING ACROSS SOUTHWESTERN
PORTIONS OF THE OUTLOOK AREA.

13

In the hours before

Local storm report, Aug 1, 7:27 PM MDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
0827 PM CDT FRI AUG 01 2003

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

0822 PM    11 SW OSHKOSH             NE   0.88 IN HAIL
08/01/03   GARDEN                         40 PLUS MPH WINDS

MB

Local storm report, Aug 1, 8:00 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
0900 PM CDT FRI AUG 01 2003

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

0855 PM    12 NE CHAPPELL            NE   60 MPH TSTORM WIND
08/01/03   DEUEL                          3+INCH TREE BRANCHES
                                          BROKEN

MB

Local storm report, Aug 1, 8:02 PM MDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
0902 PM CDT FRI AUG 01 2003

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

0857 PM    11 NNW BIG SPRINGS        NE   60 MPH TSTORM WIND
08/01/03   DEUEL

MB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 7:09 PM MDT	Severe Thunderstorm Warning	LBF	Garden	66 min
Aug 1, 7:49 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	41 min
Aug 1, 8:06 PM MDT	Severe Thunderstorm Warning	LBF	Keith	54 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.