Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1840

August 21, 200721 counties in Kansas; 26 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2007, 8:28 PM CDT for 21 counties in Kansas; 26 counties in Nebraska. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Aug 21, 2007, 8:28 PM CDT (01:28 UTC)
Expired
Aug 21, 2007, 10:00 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 47 counties

Cheyenne County, KS, Decatur County, KS, Ellis County, KS, Gove County, KS, Graham County, KS, Jewell County, KS, Lincoln County, KS, Logan County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rawlins County, KS, Republic County, KS, Rooks County, KS, Russell County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Trego County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Merrick County, NE, Nuckolls County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 98 km from the middle of the area, began a volume at 01:30 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.5 hours before the alert went out and 136 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2007-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2007-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3575 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
15 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.

IssuedProductOfficeCountiesLasted
Aug 22, 2:37 PM CDTMesoscale DiscussionSPCBrown, Doniphan, Jewell, Marshall, Nemaha, Phillips and 3 more83 min
Aug 22, 3:20 PM CDTSevere Thunderstorm WatchSPCDecatur, Graham, Jewell, Norton, Phillips, Rawlins and 3 more6 hr
Aug 22, 6:33 PM CDTMesoscale DiscussionSPCDecatur, Graham, Jewell, Norton, Phillips, Rawlins and 3 more87 min
Aug 22, 6:48 PM CDTSevere Thunderstorm WatchSPCGreeley, Logan, Sherman, Wallace, Wichita5 hr
Aug 22, 6:45 AM CDTMesoscale DiscussionSPCAntelope, Boyd, Brown, Burt, Cedar, Cuming and 11 more60 min
Aug 22, 10:12 AM CDTMesoscale DiscussionSPCAntelope, Arthur, Blaine, Boone, Brown, Burt and 35 more93 min
Aug 22, 5:31 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 5 more89 min

Nearby

Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Kansas, 2007Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.