Severe Thunderstorm Warning 207, NWS North Platte, NE

Issued

Aug 26, 2002, 4:49 AM CDT (09:49 UTC)

Expired

Aug 26, 2002, 5:45 AM CDT

In force

56 min

Issued by

NWS North Platte, NE

Area

Counties, with a storm outline in the text

County Rock County, NE

The North Platte radar (KLNX), 115 km from the middle of the area, began a volume at 09:53 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.

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.

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.

640 
WUUS53 KLBF 260949
SVRLBF
NEC149-261045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
449 AM CDT MON AUG 26 2002

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

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

* UNTIL 545 AM CDT...

* AT 447 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM 9 MILES NORTHWEST
  OF BASSETT...MOVING SOUTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE...

  OVER BASSETT AROUND 500 AM CDT...
  7 MILES SOUTHWEST OF NEWPORT AROUND 510 AM 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 EXTREMELY 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 4268 9964 4245 9964 4245 9927 4278 9927

NWS North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 26, 2:50 AM CDT, 1 hour 59 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
250 AM CDT MON AUG 26 2002

...FORECAST CONCERN WILL BE POPS OVER THE NEXT SEVERAL DAYS...

S/W AND ASSOC SPEED MAX SEEN IN H2O MOVED ACROSS HIGH PLANS INTO
NORTH CENTRAL NE SPARKING TSRA ACROSS MAINLY CHERRY COUNTY. S/W IS
MOVING IN FAST WESTERLY FLOW BETWEEN H5 RIDGE OVER THE DESERT
SOUTHWEST AND H5 TROF OVER NW CONUS. MRRN PROF SHOWING THIS SPEED
MAX WITH GOOD VEERING/WAA THROUGH 500 MB...IN ADDITION H25 JET AXIS
ARCING OVER ROCKIES INTO WESTERN NE/NE KANSAS. OTHER CONERN IS MCS
OVER WESTERN SOUTH DAKOTA WHICH NEW ETA SHOWS BUILDING SOUTHWARD
INTO CWA ALONG THETA-E AXIS. SURFACE MAP SHOWING TROF ALONG FRONT
RANGE OF ROCKIES...BUT CAN NOT REALLY PICK OUT THE BOUNDARY ON WHICH
THE TSRA IS FORMING ALONG...EXECPT THIS IS AREA OF TIGHTER DPNT
GRADIENT.

FIRST BIG CHALLENGE TODAY IS WHERE WILL DAKOTA MCS MIGRATE TO THIS
MORNING...WILL KEEP AN EYE ON THROUGH FORECAST ISSUANCE. LOOKS LIKE
NORTHEAST CWA IS UNDER THE GUN. CORFIDI VECTORS SUPPORT THE
SOUTHEAST TO SOUTHWARD MOVEMENT. AVN DOESNT HAVE A GOOD HANDLE ON
IT A 06Z AND BY 12Z-18Z MOVES AREA OF PRECIP EASTWARD THROUGH SOUTH
DAKOTA. CURRENT THINKING IS TO PLACE CHC POPS NORTH AND WEST WITH
SLGHT CHC SOUTHEAST TODAY. HOWEVER IT WORKS OUT...BEST INSTABILITY
AS IN THE PAST FEW DAYS WILL BE IN THE WEST WHERE
SOUTH/SOUTHEASTERLY UPSLOPE FLOW WILL CONTINUE TO KEEP BEST
SHEAR...AND THETA E RIDGE IN PLACE. TEMPS TODAY WILL ALSO DEPEND ON
WHERE SYSTEM TRACK...IF SOUTHWARD WOULD EXPECT MORE CLOUD COVER AND
COOLER TEMPS.

H5 TROF OFF THE WESTERN COAST WILL MOVE INLAND TODAY AND INTO GREAT
BASIN AREA TONIGHT AND PHASE WITH NORTHERN LOW OVER MT. THIS WILL
PUSH THE UPPER JET FARTHER SOUTH AND MID LEVEL FLOW WEAKENS SOMEWHAT
OVER THE WESTERN CWA TONIGHT...BUT UPSLOPE FLOW WILL CONTINUE TO
KEEP GOOD SHEAR ACROSS WESTERN HIGH PLAINS. LVL JET EVOLVES AGAIN
TONIGHT WITH THE STRONGEST ELEVATED INSTABILITY OVER THE WEST WILL
KEEP CHC POPS WEST OF HIGHWAY 83 WITH SLIGHT CHC EAST.

WILL KEEP POPS IN FOR TUESDAY AFTERNOON OVERNIGHT WITH CHC
WEST...SLGHT CHC EAST. PATTERN REMAINS SIMILAR WITH UPPER LOW OVER
THE GREAT BASIN THROWING S/WAVES INTO PLAINS IN SOUTHWEST FLOW.
UPSLOPE SOUTHEASTERLY FLOW CONTINUES WITH WAA ADVECTION REGIME
REMAINING PLANTED OVER HIGH PLAINS.

CONFIDENCE LOW ABOUT PATTERN CHANGE WEDNESDAY THROUGH WEEKEND.
H5 LOW IN GREAT BASIN EJECTS IN RESPONSE TO JET ROUNDING THE
BASE OF LOW ON LATE WEDNESDAY INTO THURS MORN...AS STRONGER WAVE
APPROACHES THE WEST COAST. WILL LEAVE REMAINDER OF FORECAST MOSTLY
AS IS WITH A FEW SLIGHT CHANGES.

.LBF...NONE.

DP

Severe Thunderstorm Warnings in Nebraska, 2002Every severe thunderstorm warning in 2002

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; radar from the NEXRAD Level II archive.