Alert archive / Nebraska / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 555

July 30, 2002Norton County, Kansas; 40 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2002, 4:35 PM CDT for Norton County, Kansas; 40 counties in Nebraska; 9 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jul 30, 2002, 4:35 PM CDT (21:35 UTC)
Expired: Jul 30, 2002, 10:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 50 counties

Norton County, KS, Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Charles Mix County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, McCook County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 134 km from the middle of the area, began a volume at 21:37 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

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:28 PM CDT	Severe Thunderstorm Warning	OAX	Knox	47 min
Jul 30, 5:36 PM CDT	Severe Thunderstorm Warning	OAX	Antelope	54 min
Jul 30, 5:56 PM CDT	Severe Thunderstorm Warning	LBF	Holt	49 min
Jul 30, 6:32 PM CDT	Severe Thunderstorm Warning	OAX	Antelope	28 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.6 hours before the alert went out and 162 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: 1420 J/kg
Mixed-layer CIN: -326 J/kg
Mixed-layer LCL: 2219 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	Dakota, Dixon	5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2002 Severe Thunderstorm Watches in South Dakota, 2002 Severe Thunderstorm Watches in Kansas, 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.