Alert archive / Nebraska / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 644

July 15, 2004Phillips County, Sedgwick County, Yuma County, Colorado; 15 counties in Kansas; 21 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 15, 2004, 5:25 PM MDT for Phillips County, Sedgwick County, Yuma County, Colorado; 15 counties in Kansas; 21 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2004, 5:25 PM MDT (23:25 UTC)
Expired: Jul 16, 2004, 12:00 AM MDT
In force: 7 hr
Issued by: the Storm Prediction Center

All 39 counties

Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Graham County, KS, Jewell County, KS, Lincoln County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Adams County, NE, Buffalo County, NE, Chase County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Webster County, NE

The radar

The Goodland radar (KGLD), 146 km from the middle of the area, began a volume at 23:25 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

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:36 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	54 min
Jul 15, 5:47 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne	58 min
Jul 15, 5:54 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	66 min
Jul 15, 6:25 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	65 min
Jul 15, 6:35 PM MDT	Severe Thunderstorm Warning	GLD	Dundy	25 min
Jul 15, 6:50 PM MDT	Severe Thunderstorm Warning	LBF	Hayes	55 min
Jul 15, 7:00 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	60 min
Jul 15, 7:11 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	49 min
Jul 15, 7:11 PM MDT	Severe Thunderstorm Warning	LBF	Chase	64 min
Jul 15, 8:07 PM MDT	Severe Thunderstorm Warning	GLD	Rawlins	53 min

Discussions around it

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

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.4 hours before the alert went out and 72 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: 1600 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 1216 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 6:49 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 8 more	86 min
Jul 15, 1:53 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Cheyenne, Denver and 13 more	3 hr
Jul 15, 4:04 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Phillips, Washington, Yuma	86 min
Jul 15, 8:32 AM MDT	Mesoscale Discussion	SPC	Dakota, Dixon	118 min
Jul 15, 10:55 AM MDT	Mesoscale Discussion	SPC	Antelope, Boyd, Burt, Butler, Cass, Cedar and 26 more	2 hr
Jul 15, 1:03 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Brown, Cedar and 22 more	2 hr
Jul 15, 2:00 PM MDT	Tornado Watch	SPC	Antelope, Boone, Boyd, Buffalo, Butler, Cedar and 23 more	6 hr
Jul 15, 5:08 PM MDT	Mesoscale Discussion	SPC	Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 4 more	97 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2004 Severe Thunderstorm Watches in Kansas, 2004 Severe Thunderstorm Watches in Colorado, 2004 Every severe thunderstorm watch in 2004

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.