Alert archive / Nebraska / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 249

May 7, 20026 counties in Iowa; Atchison County, Missouri; 33 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2002, 3:30 PM CDT for 6 counties in Iowa; Atchison County, Missouri; 33 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2002, 3:30 PM CDT (20:30 UTC)
Expired
May 7, 2002, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 40 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Woodbury County, IA, Atchison County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE

The radar

The Omaha radar (KOAX), 32 km from the middle of the area, began a volume at 20:31 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.5 hours before the alert went out and 32 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 2002-05-07Temperature 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 2002-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 226 square meters per square second.19395878Sfc1 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
990 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
226 m²/s²
0-3 km storm-relative helicity
413 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 10:00 PM CDTSevere Thunderstorm WatchSPCAudrain, Bates, Benton, Boone, Buchanan, Caldwell and 26 more6 hr
May 7, 12:45 AM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Boone, Callaway, Camden and 31 more5 hr
May 7, 3:00 AM CDTSevere Thunderstorm WatchSPCBollinger, Butler, Cape Girardeau, Carter, Dent, Douglas and 17 more5 hr
May 7, 3:00 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 16 more6 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Missouri, 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.