Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 172, NWS North Platte, NE

July 15, 2001Garden County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 15, 2001, 8:51 PM MDT for Garden County, Nebraska. It was in force for 24 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: Jul 15, 2001, 8:51 PM MDT (02:51 UTC)
Expired: Jul 15, 2001, 9:15 PM MDT
In force: 24 min
Issued by: NWS North Platte, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Garden County, NE

The radar

The North Platte radar (KLNX), 157 km from the middle of the area, began a volume at 02:52 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.

What was reported inside it

Time	Report	Where	Remark
Jul 15, 8:55 PM MDT	Hail 1	Oshkosh, 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, 2.9 hours before the alert went out and 147 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: 1292 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1209 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

880 
WUUS53 KLBF 160251
SVRLBF
NEC069-160315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
851 PM MDT SUN JUL 15 2001

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GARDEN COUNTY IN THE PANHANDLE OF NEBRASKA

* UNTIL 915 PM MDT

* AT 846 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 2 MILES SOUTHWEST OF OSHKOSH...MOVING EAST AT
  20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...

  6 MILES NORTHWEST OF LEWELLEN AROUND 915 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.

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

LAT...LON 4146 10249 4128 10244 4127 10209 4162 10209

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 Jul 15, 1:43 PM MDT, 7 hours 8 minutes earlier.

Area forecast discussion, Jul 15, 1:43 PM MDT, 7 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
243 PM CDT SUN JUL 15 2001

...CONCERNS...1ST PD POP AND TEMPS PDS 2 AND BEYOND...

ATM REMAINS MOIST...COOL AND UNSTABLE THIS AFTN.  CONVECTIVE TEMP HAS
SHOWED ITSELF IN THE LOWER 80S WITH CONVECTION FIRING ACROSS NCNTL
ZONES WITH WEAK UPPER LEVEL FORCING.  MEANWHILE KPUB IS 90F AT 19Z.
IF THIS WAA CONTS AND SPREADS INTO THE ITR-LIC-LAA-LHX AREA...SWRN
NEB ZONES COULD SEE CONVECTION BY EARLY EVENING.  AWAITING 18Z ETA
FOR FINAL LOOK AT 1ST PD FCST.  OVERALL SCT POPS SHOULD WORK MOST
AREAS. BY MONDAY AM DRYLINE IS NR SNY AND WILL MARCH EWD TO KOGA BY
21Z. EXPECT DRYLINE TO LINE UP FROM KOGA NE TO KANW THRU 21Z TUES
WITH GOOD DRYING AND WAA PATTERN SETTING PER DAKOTA LOW AND WEST
COAST TROF. TROPICAL AIR MASS IN PLACE AHEAD OF DRYLINE.  RECENT
RAINS AND MOIST AIR WILL INHIBIT WARMING SOME.  ALSO 850 MB TEMPS
ONLY NEAR 28C BOTH DAYS SO TEMPS 90-100F ARE ALL THAT IS EXPECTED.
DONT SEE MUCH FORCING FOR MONDAY AFTN FOR SVR WX.  LOOKS LIKE
MISSOURI BASIN EVENT FOR THE MOST PART.

BEYOND...WAA CONTS WED-THUR WITH DAKOTA LOW HUNG OVER RIDGE AXIS.
FCST AREA REMAINS UNDER RF QUAD FOR MOST PART.  A WEAK TROPICAL VORT
CENTER ROTATES THRU AREA WEDS BUT VERY LIMITED CONVECTION IS ALL
WITH SUBSIDENCE RULING.  FRIDAY COULD BE THE WARMEST DAY OF ALL IF
CONDS REMAIN DRY AND COMPRESSIONAL WARMING DEVELOPS PER AVN FRI AFTN.
FRONT COULD ALSO BE THE FOCUS FOR TSRA IF VERY WARM CONDS DEVELOP.
ON SATURDAY LARGE SCALE ATM READJUSTMENT OCCURS AS UPPER LEVEL RIDGE
RETREATS WWD LEAVING FCST AREA IN NW FLOW.  IF WIDESPREAD CONVECTION
DEVELOPS SATURDAY PER MRF...DRY STABLE CONDS SHOULD PREVAIL ON
SUNDAY.

.LBF...NONE.

CDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 1:58 PM MDT	Severe Thunderstorm Warning	LBF	Keya Paha, Rock	47 min
Jul 16, 2:24 PM MDT	Severe Thunderstorm Warning	LBF	Holt	66 min
Jul 16, 2:27 PM MDT	Severe Thunderstorm Warning	LBF	Boyd	48 min
Jul 16, 2:43 PM MDT	Severe Thunderstorm Warning	LBF	Rock	32 min
Jul 16, 3:15 PM MDT	Severe Thunderstorm Warning	LBF	Holt, Rock	60 min
Jul 16, 3:45 PM MDT	Severe Thunderstorm Warning	LBF	Holt	60 min
Jul 16, 4:11 PM MDT	Flash Flood Warning	LBF	Rock	3 hr
Jul 16, 4:22 PM MDT	Severe Thunderstorm Warning	LBF	Rock	53 min
Jul 16, 4:41 PM MDT	Severe Thunderstorm Warning	LBF	Holt	34 min
Jul 16, 4:50 PM MDT	Tornado Warning	LBF	Holt	25 min
Jul 16, 5:16 PM MDT	Tornado Warning	LBF	Holt	14 min
Jul 16, 5:40 PM MDT	Severe Thunderstorm Warning	LBF	Holt	65 min
Jul 16, 5:54 PM MDT	Tornado Warning	LBF	Holt	36 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; radar from the NEXRAD Level II archive.