Alert archive / Nebraska / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 183

May 1, 200115 counties in Iowa; 24 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2001, 3:30 PM CDT for 15 counties in Iowa; 24 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2001, 3:30 PM CDT (20:30 UTC)
Expired
May 1, 2001, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 39 counties

Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Pottawattamie County, IA, Shelby County, IA, Story County, IA, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 50 km from the middle of the area, began a volume at 20:29 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

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

IssuedProductOfficeCountiesLasted
May 1, 4:00 PM CDTSevere Thunderstorm WarningOAXMonona45 min
May 1, 4:10 PM CDTSevere Thunderstorm WarningOAXHarrison50 min
May 1, 4:18 PM CDTSevere Thunderstorm WarningDMXCrawford52 min
May 1, 4:45 PM CDTSevere Thunderstorm WarningOAXMonona45 min
May 1, 5:00 PM CDTSevere Thunderstorm WarningOAXHarrison60 min
May 1, 5:12 PM CDTSevere Thunderstorm WarningDMXCrawford28 min
May 1, 5:39 PM CDTSevere Thunderstorm WarningDMXCarroll46 min
May 1, 5:59 PM CDTSevere Thunderstorm WarningOAXHarrison61 min
May 1, 6:01 PM CDTSevere Thunderstorm WarningOAXBurt29 min
May 1, 6:24 PM CDTSevere Thunderstorm WarningOAXWashington36 min
May 1, 6:34 PM CDTSevere Thunderstorm WarningDMXCarroll41 min
May 1, 6:58 PM CDTTornado WarningOAXHarrison47 min
May 1, 7:35 PM CDTTornado WarningDMXCarroll, Greene, Guthrie30 min
May 1, 7:36 PM CDTTornado WarningOAXShelby24 min
May 1, 7:43 PM CDTSevere Thunderstorm WarningOAXHarrison32 min
May 1, 8:00 PM CDTSevere Thunderstorm WarningOAXShelby30 min
May 1, 8:04 PM CDTTornado WarningDMXGuthrie31 min
May 1, 8:48 PM CDTSevere Thunderstorm WarningDMXCrawford42 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.5 hours before the alert went out and 50 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 2001-05-01Temperature 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 2001-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1551 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
186 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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 3:00 PM CDTTornado WatchSPCBuena Vista, Butler, Calhoun, Cerro Gordo, Cherokee, Chickasaw and 24 more6 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Iowa, 2001Every severe thunderstorm watch in 2001

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.