Alert archive / Nebraska / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 595

August 11, 200214 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2002, 8:45 PM CDT for 14 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 11, 2002, 8:45 PM CDT (01:45 UTC)
Expired
Aug 12, 2002, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 131 km from the middle of the area, began a volume at 01:49 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.

Warnings issued inside it

9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 11, 8:47 PM CDTSevere Thunderstorm WarningLBFCuster58 min
Aug 11, 9:19 PM CDTSevere Thunderstorm WarningGIDSherman, Valley56 min
Aug 11, 9:49 PM CDTSevere Thunderstorm WarningLBFBrown, Keya Paha, Rock56 min
Aug 11, 9:53 PM CDTSevere Thunderstorm WarningGIDGreeley67 min
Aug 11, 10:04 PM CDTSevere Thunderstorm WarningGIDHoward56 min
Aug 11, 10:12 PM CDTSevere Thunderstorm WarningGIDSherman63 min
Aug 11, 10:28 PM CDTSevere Thunderstorm WarningLBFBlaine, Brown62 min
Aug 11, 10:34 PM CDTSevere Thunderstorm WarningLBFBlaine, Brown56 min
Aug 12, 1:45 AM CDTSevere Thunderstorm WarningGIDHoward45 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.8 hours before the alert went out and 181 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, N. Platte/Lee Bi, NE at 00:00Z on 2002-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1798 joules per kilogram.LCLEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 00:00Z on 2002-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
1798 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
2882 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 9:55 PM CDTSevere Thunderstorm WatchSPCCedar, Dakota, Dixon, Knox5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2002Every severe thunderstorm watch in 2002

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.