Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 125, NWS North Platte, NE

July 11, 1997Cherry County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 11, 1997, 5:46 PM MDT for Cherry County, Nebraska. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 11, 1997, 5:46 PM MDT (23:46 UTC)
Expired: Jul 11, 1997, 6:20 PM MDT
In force: 34 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Cherry County, NE

The radar

The North Platte radar (KLNX), 79 km from the middle of the area, began a volume at 23:46 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.8 hours before the alert went out and 163 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: 686 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1222 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 140 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 
TTAA00 KLBF 112347 RRA
SVRLBF
NEC031-120020-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
646 PM CDT (546 PM MDT) FRI JUL 11 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 720 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL NEBRASKA

   ...CENTRAL CHERRY COUNTY
 
AT 643 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 26 MILES NORTH OF MULLEN OR 14 MILES SOUTH SOUTHWEST
OF MERRITT RESERVOIR MOVING NORTH AT 10 MPH.

THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAbIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

SP/MTM

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 11, 1:05 PM MDT, 4 hours 41 minutes earlier.

Area forecast discussion, Jul 11, 1:05 PM MDT, 4 hours 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
205 PM CDT FRI JUL 11 1997

MAIN FORECAST PROBLEM THIS AFTERNOON AND EVENING IS THE CHANCES OF
THUNDERSTORMS AND THE POTENTIAL FOR SEVERE WEATHER...

MODIFIED LBF SOUNDING YIELDS CAPE OF AT LEAST 3000 J/KG WITH LAYER LIS
OF -5 TO -7 DEGREES AND CAP STRENGTH OF 0.5 TO 1.0 DEGREES. THETA-E
ANALYSIS THIS MORNING REVEALS A 335K RIDGE INTO SOUTHWEST NEBRASKA AT
700MB WITH 500MB VALUES 5 TO 10 DEGREES LOWER AND 850MB VALUES 10 TO 15
DEGREES WARMER. THIS BETRAYS SIGNIFICANT MID-LEVEL CONDITIONAL
INSTABILITY. THE CHANGES PROJECTED BY THE ETA GIVE INCREASES TO 340K AT
700MB AT 12/00Z AND 330-335K AT 500MB. SO...IT APPEARS THAT ALL THE
INGREDIENTS WILL BE PRESENT FOR THUNDERSTORMS IN CENTRAL AND WESTERN
NEBRASKA THIS EVENING MAINLY WEST OF A ANW-BBW LINE PER SWO DAY1
OUTLOOK AREA. ALSO...18Z ADAP INDICATES A CAP STRENGTH OF 2-4 DEGREES
IN NORTHWEST THROUGH CENTRAL NEBRASKA AND SURFACE MOISTURE CONVERGENCE
MOST FAVORABLE WEST OF A VTN-IML LINE. ETA POINTS TO CAP STRENGTH OF
ZERO BY 12/00Z...SO THINK THAT THE WEAKENING OF THE CAP WILL CONTINUE.
SATELLITE AND LNX WSR-88D ARE ALREADY SHOWING DEVELOPING CLOUDS AT 18Z
AND SEE NO REASON THAT IT WONT CONTINUE. LOOKING TO LATER PERIODS...
GRIDDED DATA IS MISSING FROM THIS MORNINGS RUN. HOWEVER...THE ETA
PROGS FROM LAST NIGHTS MODEL RUN INDICATE THAT THE 850MB THETA-E ON
SATURDAY WILL BE MOST FAVORABLE TO THUNDERSTORM DEVELOPMENT EAST OF A
VTN-BBW LINE. BASED ON THE FOREGOING...WOULD RECOMMEND PROBABILITIES AT
LEAST A CATEGORY HIGHER THAN THE CURRENT FORECAST FOR THE WESTERN ZONES
TONIGHT AND ABOUT THE SAME AS THE CURRENT FORECAST IN THE EASTERN ZONES
FOR TONIGHT AND SATURDAY.

ANOTHER FORECAST PROBLEM IS THE PERSISTENCE OF THE 90 DEGREE
TEMPERATURES THIS WEEKEND.

THE 700MB WIND FIELD WILL NOT GIVE A STRONG PUSH ON THE FRONT IN
WYOMING AND COLORADO...SO NO CHANGE IS LIKELY IN THE IMMEDIATE FUTURE
FOR THE LBF CWA. VERILY...THE ETA/AVN 1000-500MB THICKNESS HAS NO CHANGE
BETWEEN THIS EVENING AND SATURDAY EVENING...SO TEMPERATURES CLOSE TO
TODAYS VALUES SHOULD HOLD FOR SATURDAY AS WELL. BY SUNDAY EVENING...
HOWEVER...THE MRF HAS THICKNESSES OF 60M LESS THAN TODAYS AND
SATURDAYS...SO EXPECT TEMPERATURES SUNDAY TO BE ABOUT 5 DEGREES
COOLER.

RECOMMENDED FORECAST

NEZ004-005-023>025-120915-
SHERIDAN-CHERRY-GRANT-HOOKER-THOMAS-
INCLUDING THE COMMUNITIES OF VALENTINE...MULLEN
400 PM CDT FRI JUL 11 1997

.TONIGHT...A 40 PERCENT CHANCE OF THUNDERSTORMS.  LOW IN THE MID 60S.
VARIABLE WIND 5 TO 10 MPH.
.SATURDAY...PARTLY CLOUDY WITH A 30 PERCENT CHANCE OF THUNDERSTORMS.
HIGH AROUND 90.  SOUTH WIND 5 TO 15 MPH.
.SATURDAY NIGHT...PARTLY CLOUDY WITH A 30 PERCENT CHANCE OF
THUNDERSTORMS.  LOW IN THE MID 60S.
.SUNDAY...PARTLY CLOUDY AND NOT AS HOT.  HIGH IN THE MID 80S.

NEZ006>010-026-029-038-120915
KEYA PAHA-BOYD-BROWN-ROCK-HOLT-BLAINE-LOUP-GARFIELD-WHEELER-CUSTER-
INCLUDING THE COMMUNITIES OF AINSWORTH...O NEILL...BURWELL...BROKEN BOW
400 PM CDT FRI JUL 11 1997

.TONIGHT...PARTLY CLOUDY WITH A 20 PERCENT CHANCE OF THUNDERSTORMS. LOW
65 TO 70.  SOUTHEAST WIND 5 TO 15 MPH.
.SATURDAY...PARTLY CLOUDY WITH A 30 PERCENT CHANCE OF THUNDERSTORMS.
HIGH AROUND 90.  SOUTH WIND 10 TO 15 MPH.
.SATURDAY NIGHT...A 40 PERCENT CHANCE OF THUNDERSTORMS.  LOW 65 TO 70.
.SUNDAY...PARTLY CLOUDY AND NOT AS HOT.  HIGH IN THE MID 80S.

NEZ022-035>037-056>059-069>071-120915-
GARDEN-ARTHUR-MCPHERSON-LOGAN-DEUEL-KEITH-PERKINS-LINCOLN-CHASE-HAYES-
FRONTIER-
INCLUDING THE CITIES OF OGALLALA...NORTH PLATTE...IMPERIAL
400 PM CDT FRI JUL 11 1997

.TONIGHT...A 40 PERCENT CHANCE OF THUNDERSTORMS.  LOW IN THE MID 60S.
SOUTHEAST WIND 5 TO 15 MPH.
.SATURDAY...PARTLY CLOUDY WITH A 30 PERCENT CHANCE OF THUNDERSTORMS.
HIGH AROUND 90.  SOUTHEAST WIND 5 TO 15 MPH.
.SATURDAY NIGHT...PARTLY CLOUDY WITH A 30 PERCENT CHANCE OF
THUNDERSTORMS.  LOW IN THE MID 60S.
.SUNDAY...PARTLY CLOUDY AND NOT AS HOT.  HIGH IN THE MID 80S.

VTN BB 64/91 63/87 59 49433
ANW BB 67/90 67/86 63 49234
ONL BB 69/91 68/87 64 49234
BBW BB 66/90 65/86 61 49234
LBF BB 64/89 63/87 60 49433
OGA BB 65/90 64/86 60 49433
IML BB 66/91 65/87 61 49433

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 7:46 PM MDT	Severe Thunderstorm Warning	LBF	Garden, Sheridan	64 min
Jul 10, 8:50 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	65 min
Jul 10, 8:53 PM MDT	Severe Thunderstorm Warning	LBF	Garden	62 min
Jul 10, 9:32 PM MDT	Severe Thunderstorm Warning	LBF	Grant	63 min
Jul 11, 3:09 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	46 min
Jul 11, 4:51 PM MDT	Severe Thunderstorm Warning	LBF	Hooker	49 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1997 Every severe thunderstorm warning in 1997

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.