Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 220, NWS North Platte, NE

July 28, 2001Cherry County, Keya Paha County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 28, 2001, 8:45 PM MDT for Cherry County, Keya Paha County, Nebraska. It was in force for 45 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 28, 2001, 8:45 PM MDT (02:45 UTC)
Expired: Jul 28, 2001, 9:30 PM MDT
In force: 45 min
Issued by: NWS North Platte, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Cherry County, NE, Keya Paha County, NE

The radar

The North Platte radar (KLNX), 115 km from the middle of the area, began a volume at 02:45 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 28, 9:30 PM MDT	Hail 1	Springview, NE	Small tree limbs down.

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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 28, 7:45 PM MDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.8 hours before the alert went out and 205 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: 1283 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 2023 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLBF 290246
SVRLBF
NEC031-103-290330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
945 PM CDT SAT JUL 28 2001

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CHERRY COUNTY IN NORTH CENTRAL NEBRASKA
  WESTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA

* UNTIL 1030 PM CDT

* AT 940 PM CDT(840 PM MDT)...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A SEVERE THUNDERSTORM 17 MILES NORTHWEST OF SPARKS...OR
  ABOUT 18 MILES NORTH OF VALENTINE...MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...

  6 MILES NORTHEAST OF SPARKS AROUND 1010 PM CDT

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE 
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE 
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. THIS STORM HAS A HISTORY
OF PRODUCING VERY LARGE HAIL.

A+ SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY
MORNING FOR NORTH CENTRAL NEBRASKA.

LAT...LON 4305 9980 4310 10067 4281 10063 4285 10024
          4279 9973
$$
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 Jul 28, 7:40 PM MDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jul 28, 7:40 PM MDT, 1 hour 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
840 PM CDT SAT JUL 28 2001

WATCH #637 ON ITS WAY...CLUSTER OF STORMS MOVING SOUTHEAST OUT OF SD
SHOULD HOLD TOGETHER INTO NC ZONES. LAPS DATA SHOWS FAIRLY HIGH CIN
VALUES IN THE NERN ZONES...SO SOME CONCERN ABOUT POTENTIAL FOR
WINDS TO GET TO THE GROUND. STILL..AS STORMS FROM WRN CHERRY MOVE
INTO LOW LEVEL JET WHICH IS INCREASING...SOME ADDITIONAL DEVELOPMENT
IS POSSIBLE.f MERRIMAN PROFILER INDICATING 0-2KM SHEAR INCREASING AND
WITH STORMS MOVING SE...INFLOW SHOULD BE FAVORABLE AS THEY MOVE
INTO DEEPER MOISTURE.

.LBF...NONE.

JWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 9:29 PM MDT	Severe Thunderstorm Warning	LBF	Keya Paha	61 min
Jul 28, 9:50 PM MDT	Severe Thunderstorm Warning	LBF	Brown	40 min
Jul 29, 3:33 PM MDT	Severe Thunderstorm Warning	LBF	Keith	57 min
Jul 29, 4:30 PM MDT	Severe Thunderstorm Warning	LBF	Keith	60 min
Jul 29, 5:20 PM MDT	Severe Thunderstorm Warning	LBF	Brown	40 min
Jul 29, 5:27 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	63 min
Jul 29, 5:44 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	31 min
Jul 29, 5:56 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	64 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.