Alert archive / Nebraska / Tornado Warnings in 1999

Tornado Warning 44, NWS Omaha, NE

May 30, 1999Jefferson County, Nebraska

NWS Omaha, NE issued this tornado warning at May 30, 1999, 4:40 PM CDT for Jefferson County, Nebraska. It was in force for 35 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 30, 1999, 4:40 PM CDT (21:40 UTC)
Expired
May 30, 1999, 5:15 PM CDT
In force
35 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Jefferson County, NE

The radar

The Grand Island radar (KUEX), 111 km from the middle of the area, began a volume at 21:44 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.

What was reported inside it

TimeReportWhereRemark
May 30, 5:09 PM CDTHail 0.75Plymouth, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.7 hours before the alert went out and 143 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 12:00Z on 1999-05-30Temperature 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, Omaha, NE at 12:00Z on 1999-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.1939Sfc1 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
1186 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 30, 1:52 PM CDTSevere Thunderstorm WarningOAXLancaster33 min
May 30, 1:59 PM CDTSevere Thunderstorm WarningOAXGage31 min
May 30, 2:20 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Saunders50 min
May 30, 2:33 PM CDTSevere Thunderstorm WarningOAXGage47 min
May 30, 2:59 PM CDTSevere Thunderstorm WarningOAXDouglas, Sarpy46 min
May 30, 3:38 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline47 min
May 30, 4:31 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson49 min
May 30, 4:57 PM CDTFlash Flood WarningOAXGage, Jefferson, Saline3 hr
May 30, 5:18 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson47 min
May 30, 6:04 PM CDTSevere Thunderstorm WarningOAXJefferson51 min
May 30, 6:06 PM CDTSevere Thunderstorm WarningOAXPawnee49 min
May 30, 6:57 PM CDTFlash Flood WarningOAXPawnee3 hr
May 30, 5:45 PM CDTFlash Flood WarningOAXPage3 hr

Nearby

Tornado Warnings in Nebraska, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.