Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 130, NWS North Platte, NE

July 24, 2002Loup County, Rock County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 24, 2002, 5:24 PM CDT for Loup County, Rock County, Nebraska. It was in force for 36 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 24, 2002, 5:24 PM CDT (22:24 UTC)
Expired: Jul 24, 2002, 6:00 PM CDT
In force: 36 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

Counties Loup County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 98 km from the middle of the area, began a volume at 22:28 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 24, 5:47 PM CDT	Hail 0.75	Taylor, NE
Jul 24, 6:00 PM CDT	Hail 4.5	Burwell, 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.

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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.4 hours before the alert went out and 139 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: 888 J/kg
Mixed-layer CIN: -329 J/kg
Mixed-layer LCL: 1470 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

850 
WUUS53 KLBF 242224
SVRLBF
NEC115-149-242300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
524 PM CDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

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

* UNTIL 600 PM CDT...

* AT 523 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM ALONG A LINE
  EXTENDING FROM 25 MILES NORTHEAST OF TAYLOR TO 9 MILES NORTHEAST OF
  ALMERIA...OR ALONG A LINE EXTENDING FROM 23 MILES NORTH OF BURWELL
  TO 11 MILES NORTH OF TAYLOR...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE...

  OVER TAYLOR AROUND 530 PM 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.

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

LAT...LON 4214 9942 4176 9963 4177 9924 4213 9925

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 24, 3:06 PM CDT, 2 hours 18 minutes earlier.

Area forecast discussion, Jul 24, 3:06 PM CDT, 2 hours 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
306 PM CDT WED JUL 24 2002

...FORECAST CHALLENGE TO BE TEMPS AND CHANCES OF PCPN...

ATM BECOMING MORE MOIST AS TROPICAL INFLUENCES INVADE THE HOT RIDGE
OF 2002.  THUS 700MB AND 500 MB TEMPS ARE COOLING SLIGHTLY MAKING
THE ENVIRONMENT MORE FAVORABLE FOR CONVECTION.  THIS AFTN...MID
LEVEL SUBSIDENCE INVERSION APPEARS TO CAPPING ATM PRECLUDING TSRA
DEVELOPMENT.  ISOLD TSRA MAY DEVELOP THIS EVENING NR KONL AREA.

NEXT SLIGHT CHANCE OF TSTMS IS THURSDAY NIGHT AS A SHORT WAVE TROF
MOVES THRU.  A WEAK COLD FRONT IS SUPPOSE TO MOVE THRU TONIGHT WITH
MOISTURE WRAPPING NW THROUGHOUT THE DAY THURSDAY...THE ETA APPEARS
TO BE TOO FAST WITH THE FRONT AS THE DAKOTA BLOWER HAS REMAINED
ANCHORED OVER SD THIS AFTN AND WILL REMAIN SO UNTIL LATE TONIGHT
WHEN A SHORT WAVE MOVES WELL NORTH OF FCST AREA PER 1941Z SWOMCD.

THE THURSDAY NIGHT DISTURBANCE PERSUMABLY SENDS A COLD FRONT INTO SW
NEB-NEWD THRU NE NEB ON FRIDAY WHICH COULD PRODUCE AN ISOLD LATE
AFTN/EVE TSRA ACROSS FAR ERN ZONES.

TEMPERATURES ARE A COMPROMISE BETWEEN THE VERY WARM ETA AND OVERLY
COOL AVN.

BEYOND...FOLLOWED AVN WITH A SLIGHT CHANCE OF TSRA SUNDAY NIGHT AS
ANOTHER RIPPLE MOVES THROUGH.  OVERALL THE UPPER LEVEL RIDGE IS
FLATTENING AND BECOMING MORE MOIST.  THE TROPICAL INFLUENCES ARE
READILY VISIBLE ON SATELLITE AND 700MB RAOB ANALYSIS.  A PAIR OF
HURRICANES IN THE EASTERN PAC ARE ALSO CONTRIBUTING TO MORE MOIST
AND UNCERTAIN UPPER LEVEL CONDS.

OUTER PERIODS HAVE BEEN KEPT DRY FOR NOW WITH SLIGHTLY ABOVE NORMAL
TEMPERATURES.

.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 24, 4:57 PM CDT	Severe Thunderstorm Warning	LBF	Holt	63 min
Jul 24, 5:33 PM CDT	Severe Thunderstorm Warning	LBF	Garfield	57 min
Jul 24, 6:00 PM CDT	Severe Thunderstorm Warning	LBF	Holt	60 min
Jul 24, 6:15 PM CDT	Severe Thunderstorm Warning	LBF	Garfield	45 min
Jul 24, 6:28 PM CDT	Tornado Warning	LBF	Holt	32 min
Jul 24, 6:44 PM CDT	Tornado Warning	LBF	Wheeler	61 min

Nearby

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

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.