Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 251, NWS Omaha, NE

July 5, 1998Knox County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 5, 1998, 11:20 PM CDT for Knox County, Nebraska. It was in force for 45 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
Jul 5, 1998, 11:20 PM CDT (04:20 UTC)
Expired
Jul 6, 1998, 12:05 AM CDT
In force
45 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Knox County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.3 hours before the alert went out and 193 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 1998-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2793 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 1998-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 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
2793 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
661 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
265 m²/s²
Significant tornado parameter
3.3
Supercell composite
14.8

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
Jul 5, 10:20 PM CDTSevere Thunderstorm WarningOAXKnox60 min
Jul 5, 10:28 PM CDTFlash Flood WarningOAXWashington6 hr
Jul 5, 11:32 PM CDTSevere Thunderstorm WarningOAXAntelope48 min
Jul 6, 3:51 PM CDTSevere Thunderstorm WarningOAXKnox64 min
Jul 6, 4:27 PM CDTSevere Thunderstorm WarningOAXAntelope63 min
Jul 6, 4:30 PM CDTSevere Thunderstorm WarningOAXCedar65 min
Jul 6, 4:45 PM CDTTornado WarningOAXAntelope, Knox, Pierce60 min
Jul 6, 5:07 PM CDTTornado WarningOAXCedar63 min
Jul 6, 5:19 PM CDTSevere Thunderstorm WarningOAXBoone, Madison61 min
Jul 6, 5:19 PM CDTSevere Thunderstorm WarningOAXPierce, Wayne61 min
Jul 6, 5:26 PM CDTSevere Thunderstorm WarningOAXStanton79 min
Jul 6, 5:58 PM CDTSevere Thunderstorm WarningOAXCuming, Thurston67 min
Jul 6, 5:58 PM CDTSevere Thunderstorm WarningOAXCuming, Thurston62 min
Jul 6, 6:11 PM CDTTornado WarningOAXColfax, Platte64 min
Jul 6, 6:16 PM CDTSevere Thunderstorm WarningOAXBurt64 min
Jul 6, 6:37 PM CDTSevere Thunderstorm WarningOAXDodge63 min
Jul 6, 6:59 PM CDTSevere Thunderstorm WarningOAXWashington61 min
Jul 6, 6:34 PM CDTTornado WarningOAXMonona61 min
Jul 6, 6:49 PM CDTTornado WarningOAXHarrison61 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.