Alert archive / Nebraska / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 409

May 17, 20038 counties in Nebraska; 7 counties in South Dakota; 7 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at May 17, 2003, 2:55 PM MDT for 8 counties in Nebraska; 7 counties in South Dakota; 7 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2003, 2:55 PM MDT (20:55 UTC)
Expired: May 17, 2003, 9:00 PM MDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 22 counties

Banner County, NE, Box Butte County, NE, Cherry County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Oglala Lakota County, SD, Pennington County, SD, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

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
May 17, 6:42 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	63 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

Rapid City, SD (KUNR), launched 12:00Z, 8.9 hours before the alert went out and 145 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 2:23 PM MDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Sheridan, Sioux	3 hr
May 17, 5:45 PM MDT	Mesoscale Discussion	SPC	Box Butte, Cherry, Dawes, Sheridan, Sioux	2 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2003 Severe Thunderstorm Watches in South Dakota, 2003 Severe Thunderstorm Watches in Wyoming, 2003 Every severe thunderstorm watch in 2003

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.