Alert archive / Nebraska / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 918

September 9, 200317 counties in Nebraska; 4 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 9, 2003, 9:25 PM CDT for 17 counties in Nebraska; 4 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Sep 9, 2003, 9:25 PM CDT (02:25 UTC)
Expired: Sep 10, 2003, 2:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 21 counties

Antelope County, NE, Boone County, NE, Boyd County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Gregory County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 128 km from the middle of the area, began a volume at 02:24 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.

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 00:00Z, 2.4 hours before the alert went out and 156 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: 1235 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 9, 7:07 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Dawson, Franklin, Frontier, Furnas and 8 more	113 min
Sep 9, 9:06 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 39 more	114 min
Sep 9, 9:44 PM CDT	Mesoscale Discussion	SPC	Buffalo, Dawson, Franklin, Frontier, Furnas, Gosper and 6 more	3 hr
Sep 10, 1:31 AM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Blaine, Box Butte, Brown, Cherry and 18 more	2 hr
Sep 10, 11:43 AM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Butler and 33 more	2 hr
Sep 10, 1:55 PM CDT	Tornado Watch	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Cedar and 35 more	6 hr
Sep 10, 2:57 PM CDT	Mesoscale Discussion	SPC	Chase, Deuel, Dundy, Hayes, Hitchcock, Keith and 1 more	2 hr
Sep 10, 3:57 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Cedar and 33 more	93 min
Sep 10, 6:53 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Cedar and 33 more	67 min
Sep 10, 2:07 PM CDT	Mesoscale Discussion	SPC	Beadle, Brown, Campbell, Clark, Day, Edmunds and 8 more	83 min
Sep 10, 2:35 PM CDT	Tornado Watch	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Campbell and 22 more	5 hr
Sep 10, 5:27 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brown, Charles Mix, Clark, Davison and 17 more	93 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2003 Severe Thunderstorm Watches in South Dakota, 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; radar from the NEXRAD Level II archive.