Alert archive / Nebraska / Tornado Watches in 1998

Tornado Watch 392

May 21, 199837 counties in Nebraska

The Storm Prediction Center issued this tornado watch at May 21, 1998, 8:30 PM CDT for 37 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 21, 1998, 8:30 PM CDT (01:30 UTC)
Expired
May 22, 1998, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 37 counties

Adams County, NE, Buffalo County, NE, Butler County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Perkins County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The North Platte radar (KLNX), 128 km from the middle of the area, began a volume at 01:31 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.

Warnings issued inside it

30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 21, 8:30 PM CDTTornado WarningGIDKearney, Phelps30 min
May 21, 8:59 PM CDTTornado WarningLBFHayes66 min
May 21, 9:01 PM CDTTornado WarningGIDAdams, Kearney29 min
May 21, 9:01 PM CDTTornado WarningGIDPhelps29 min
May 21, 9:08 PM CDTSevere Thunderstorm WarningLBFPerkins47 min
May 21, 9:26 PM CDTTornado WarningLBFFrontier64 min
May 21, 9:32 PM CDTSevere Thunderstorm WarningGIDKearney28 min
May 21, 9:42 PM CDTTornado WarningGIDKearney33 min
May 21, 9:59 PM CDTTornado WarningLBFFrontier66 min
May 21, 10:14 PM CDTTornado WarningGIDAdams, Kearney31 min
May 21, 10:17 PM CDTSevere Thunderstorm WarningGIDHall43 min
May 21, 10:23 PM CDTSevere Thunderstorm WarningGIDPolk, York37 min
May 21, 10:30 PM CDTTornado WarningGIDGosper45 min
May 21, 10:47 PM CDTSevere Thunderstorm WarningGIDAdams43 min
May 21, 10:47 PM CDTSevere Thunderstorm WarningOAXButler, Seward63 min
May 21, 11:02 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton, Merrick43 min
May 21, 11:02 PM CDTSevere Thunderstorm WarningGIDBuffalo43 min
May 21, 11:13 PM CDTSevere Thunderstorm WarningLBFChase62 min
May 21, 11:17 PM CDTTornado WarningGIDGosper, Phelps43 min
May 21, 11:21 PM CDTSevere Thunderstorm WarningGIDPolk, York39 min
May 21, 11:24 PM CDTSevere Thunderstorm WarningGIDClay36 min
May 21, 11:40 PM CDTSevere Thunderstorm WarningGIDBuffalo35 min
May 21, 11:44 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton46 min
May 21, 11:46 PM CDTSevere Thunderstorm WarningLBFChase44 min
May 21, 11:57 PM CDTTornado WarningGIDKearney, Phelps48 min
May 22, 12:01 AM CDTSevere Thunderstorm WarningGIDClay, Fillmore, York49 min
May 22, 12:11 AM CDTFlash Flood WarningOAXButler, Seward6 hr
May 22, 12:47 AM CDTSevere Thunderstorm WarningGIDFillmore33 min
May 22, 12:48 AM CDTSevere Thunderstorm WarningGIDAdams, Franklin, Kearney, Webster47 min
May 22, 12:56 AM CDTSevere Thunderstorm WarningOAXSaline64 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.5 hours before the alert went out and 59 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 00:00Z on 1998-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 685 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1998-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
685 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 11:30 PM CDTTornado WatchSPCCass, Dodge, Douglas, Gage, Johnson, Lancaster and 7 more6 hr
May 22, 2:30 PM CDTSevere Thunderstorm WatchSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more7 hr
May 22, 6:45 PM CDTSevere Thunderstorm WatchSPCChase, Dundy, Hayes, Hitchcock, Perkins5 hr

Nearby

Tornado Watches in Nebraska, 1998Every tornado watch 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.