Alert archive / Nebraska / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 350

May 27, 2002Woodbury County, Iowa; 27 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2002, 10:30 PM CDT for Woodbury County, Iowa; 27 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 27, 2002, 10:30 PM CDT (03:30 UTC)
Expired: May 28, 2002, 3:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 28 counties

Woodbury County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Hamilton County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Pierce 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, Wayne County, NE, York County, NE

The radar

The Omaha radar (KOAX), 92 km from the middle of the area, began a volume at 03:31 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 27, 11:21 PM CDT	Severe Thunderstorm Warning	GID	York	54 min
May 27, 11:45 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Seward	45 min
May 28, 12:07 AM CDT	Severe Thunderstorm Warning	OAX	Antelope	38 min
May 28, 12:29 AM CDT	Severe Thunderstorm Warning	OAX	Butler	46 min
May 28, 1:48 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline	27 min
May 28, 2:12 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	48 min
May 28, 2:25 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	35 min
May 28, 2:30 AM CDT	Severe Thunderstorm Warning	OAX	Sarpy	30 min

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.5 hours before the alert went out and 92 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 555 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1882 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 28, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 17 more	5 hr
May 27, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boyd, Brown, Buffalo, Cherry and 22 more	5 hr

Nearby

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