Alert archive / Nebraska / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 211, NWS Omaha, NE

August 19, 2009Gage County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 19, 2009, 6:30 PM CDT for Gage 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
Aug 19, 2009, 6:30 PM CDT (23:30 UTC)
Expired
Aug 19, 2009, 7:15 PM CDT
In force
45 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon

County Gage County, NE

The radar

The Omaha radar (KOAX), 121 km from the middle of the area, began a volume at 23:31 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 19, 5:32 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 121 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 2009-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 285 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 12:00Z on 2009-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939587897Sfc1 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
285 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 4:49 PM CDTSevere Thunderstorm WarningOAXAntelope, Madison, Pierce34 min
Aug 19, 5:21 PM CDTSevere Thunderstorm WarningOAXSaline54 min
Aug 19, 5:52 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster, Saline23 min
Aug 19, 6:01 PM CDTSevere Thunderstorm WarningOAXCuming, Stanton32 min
Aug 19, 6:17 PM CDTSevere Thunderstorm WarningOAXGage, Johnson, Lancaster, Otoe43 min
Aug 19, 6:27 PM CDTSevere Thunderstorm WarningOAXJefferson48 min
Aug 19, 6:47 PM CDTSevere Thunderstorm WarningOAXColfax, Platte32 min
Aug 19, 5:04 PM CDTSevere Thunderstorm WarningOAXFremont, Page56 min
Aug 19, 5:49 PM CDTSevere Thunderstorm WarningOAXPage26 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2009Every severe thunderstorm warning in 2009

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.