Alert archive / Nebraska / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 440

June 21, 20076 counties in Kansas; 25 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2007, 7:15 PM CDT for 6 counties in Kansas; 25 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2007, 7:15 PM CDT (00:15 UTC)
Expired: Jun 22, 2007, 1:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 31 counties

Cheyenne County, KS, Decatur County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Smith County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 80 km from the middle of the area, began a volume at 00:16 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 21, 8:22 PM CDT	Severe Thunderstorm Warning	GLD	Cheyenne	53 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 3:00 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Greeley, Hamilton, Morton, Sherman, Stanton and 1 more	3 hr
Jun 22, 3:22 PM CDT	Severe Thunderstorm Watch	SPC	Cheyenne, Grant, Greeley, Hamilton, Kearny, Logan and 8 more	7 hr
Jun 22, 6:48 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Grant, Greeley, Hamilton, Kearny, Logan and 8 more	117 min
Jun 21, 9:45 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Boyd, Burt, Butler, Cedar and 21 more	2 hr
Jun 22, 2:21 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Burt, Butler, Cass, Clay and 36 more	114 min
Jun 22, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	Burt, Butler, Cass, Clay, Colfax, Dodge and 13 more	6 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2007 Severe Thunderstorm Watches in Kansas, 2007 Every severe thunderstorm watch in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.