Alert archive / Nebraska / Flash Flood Warnings in 1998

Flash Flood Warning 3, NWS North Platte, NE

June 21, 1998Keith County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jun 21, 1998, 5:42 PM MDT for Keith County, Nebraska. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 1998, 5:42 PM MDT (23:42 UTC)
Expired
Jun 21, 1998, 8:40 PM MDT
In force
3 hr
Issued by
NWS North Platte, NE
Area
Whole counties

County Keith County, NE

The radar

The North Platte radar (KLNX), 124 km from the middle of the area, began a volume at 23:42 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, 11.7 hours before the alert went out and 89 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 1998-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 1998-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1733 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
99 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 212340
FFWLBF
NEC101-220240-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
642 PM CDT (542 PM MDT) SUN JUN 21 1998

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN KEITH COUNTY IN SOUTHWESTERN NEBRASKA

* UNTIL 840 PM MDT (940 PM CDT)

* AT 635 PM CDT... NORTH PLATTE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH VERY HEAVY RAIN 6 NW OGALLALA... MOVING S.LOWLY
  SOUTHEAST.

* THUNDERSTORM HAS THE POTENTIAL FOR PRODUCING AROUND 3 INCHES OF
  RAIN SO THAT RAPID RUNOFF ON ROADS WILL BE POSSIBLE.

DON'T DRIVE ACROSS FLOODED ROADS! MOST FLASH FLOOD DEATHS OCCUR IN
AUTOMOBILES.

RLB

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 2:50 PM MDTSevere Thunderstorm WarningLBFGarden65 min
Jun 21, 3:14 PM MDTSevere Thunderstorm WarningLBFGarden66 min
Jun 21, 4:19 PM MDTSevere Thunderstorm WarningLBFGarden46 min
Jun 21, 4:35 PM MDTSevere Thunderstorm WarningLBFKeith65 min
Jun 21, 4:49 PM MDTSevere Thunderstorm WarningLBFGarden66 min
Jun 21, 5:07 PM MDTFlash Flood WarningLBFGarden3 hr
Jun 21, 5:22 PM MDTSevere Thunderstorm WarningLBFCherry63 min

Nearby

Flash Flood Warnings in Nebraska, 1998Every flash flood warning in 1998

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.