Alert archive / Nebraska / Tornado Warnings in 1998

Tornado Warning 21, NWS Omaha, NE

May 22, 1998Lancaster County, Nebraska

NWS Omaha, NE issued this tornado warning at May 22, 1998, 12:16 AM CDT for Lancaster County, Nebraska. It was in force for 19 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 22, 1998, 12:16 AM CDT (05:16 UTC)
Expired
May 22, 1998, 12:35 AM CDT
In force
19 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Lancaster County, NE

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 21, 11:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.3 hours before the alert went out and 65 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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 7:47 PM CDTSevere Thunderstorm WarningOAXBurt18 min
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, 12:19 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

Nearby

Tornado Warnings in Nebraska, 1998Every tornado warning in 1998Tornadoes 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.