Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 111, NWS Omaha, NE

May 21, 1998Burt County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 21, 1998, 7:47 PM CDT for Burt County, Nebraska. It was in force for 18 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
May 21, 1998, 7:47 PM CDT (00:47 UTC)
Expired
May 21, 1998, 8:05 PM CDT
In force
18 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Burt County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.8 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, Omaha, NE at 00:00Z on 1998-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 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, Omaha, NE at 00:00Z on 1998-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 300 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
66 J/kg
Mixed-layer CIN
-295 J/kg
Mixed-layer LCL
905 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
300 m²/s²
0-3 km storm-relative helicity
484 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.6

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.

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.

In the hours before

Special weather statement, May 21, 5:05 PM CDT, 2 hours 42 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-221200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
505 PM CDT THU MAY 21 1998

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION MAY BE NEEDED TONIGHT IN EASTERN NEBRASKA
AND SOUTHWEST IOWA.

DISCUSSION...
THUNDERSTORMS WILL BE SCATTERED ACROSS MUCH OF EASTERN NEBRASKA AND
SOUTHWEST IOWA THROUGH TONIGHT.  THE CHANCE OF SEVERE STORMS IS
SLIGHTLY HIGHER SOUTH OF A LINE FROM NELIGH TO TEKAMAH AND HARLAN
IOWA WHERE THE ATMOSPHERE IS MORE UNSTABLE.  THUNDERSTORMS WILL HAVE
POTENTIAL TO PRODUCE DAMAGING WINDS AND HAIL.  SIGNIFICANT RAINFALL
IS ALSO POSSIBLE.
>
A NEARLY STATIONARY FRONT EXTENDS FROM SOUTHERN MISSOURI TO NORTHERN
KANSAS AND EASTERN WYOMING.  VERY MOIST AND UNSTABLE AIR SOUTH OF THE
FRONT WILL CONTINUE TO BE LIFTED NORTH ACROSS NEBRASKA AND SOUTHWEST
IOWA...WHILE UPPER LEVEL DISTURBANCES TRACK OVER THE AREA.

MILLER
Special weather statement, May 21, 5:05 PM CDT, 2 hours 42 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-221200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
505 PM CDT THU MAY 21 1998

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION MAY BE NEEDED TONIGHT IN EASTERN NEBRASKA
AND SOUTHWEST IOWA.

DISCUSSION...
THUNDERSTORMS WILL BE SCATTERED ACROSS MUCH OF EASTERN NEBRASKA AND
SOUTHWEST IOWA THROUGH TONIGHT.  THE CHANCE OF SEVERE STORMS IS
SLIGHTLY HIGHER SOUTH OF A LINE FROM NELIGH TO TEKAMAH AND HARLAN
IOWA WHERE THE ATMOSPHERE IS MORE UNSTABLE.  THUNDERSTORMS WILL HAVE
POTENTIAL TO PRODUCE DAMAGING WINDS AND HAIL.  SIGNIFICANT RAINFALL
IS ALSO POSSIBLE.
>
A NEARLY STATIONARY FRONT EXTENDS FROM SOUTHERN MISSOURI TO NORTHERN
KANSAS AND EASTERN WYOMING.  VERY MOIST AND UNSTABLE AIR SOUTH OF THE
FRONT WILL CONTINUE TO BE LIFTED NORTH ACROSS NEBRASKA AND SOUTHWEST
IOWA...WHILE UPPER LEVEL DISTURBANCES TRACK OVER THE AREA.

MILLER

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 10:47 PM CDTSevere Thunderstorm WarningOAXButler, Seward63 min
May 21, 11:23 PM CDTSevere Thunderstorm WarningOAXLancaster, Saunders62 min
May 22, 12:02 AM CDTTornado WarningOAXLancaster33 min
May 22, 12:11 AM CDTFlash Flood WarningOAXButler, Seward6 hr
May 22, 12:16 AM CDTTornado WarningOAXLancaster19 min
May 22, 12:19 AM CDTSevere Thunderstorm WarningOAXSarpy46 min
May 22, 12:38 AM CDTSevere Thunderstorm WarningOAXCass62 min
May 22, 12:44 AM CDTSevere Thunderstorm WarningOAXSaunders16 min
May 22, 12:46 AM CDTFlash Flood WarningOAXLancaster, Saunders5 hr
May 22, 12:56 AM CDTSevere Thunderstorm WarningOAXSaline64 min
May 22, 1:04 AM CDTSevere Thunderstorm WarningOAXSarpy46 min
May 22, 1:48 AM CDTSevere Thunderstorm WarningOAXGage, Lancaster62 min
May 21, 7:29 PM CDTSevere Thunderstorm WarningOAXHarrison, Monona61 min
May 21, 7:50 PM CDTTornado WarningOAXHarrison, Monona50 min
May 21, 8:47 PM CDTTornado WarningOAXPottawattamie33 min
May 22, 2:36 AM CDTSevere Thunderstorm WarningOAXPage64 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1998Every severe thunderstorm 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.