Alert archive / Nebraska / Mesoscale Discussions in 2009

Mesoscale Discussion 1920

August 19, 200924 counties in Kansas; 32 counties in Nebraska; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2009, 2:46 PM CDT for 24 counties in Kansas; 32 counties in Nebraska; 5 counties in South Dakota. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Aug 19, 2009, 2:46 PM CDT (19:46 UTC)
Expired
Aug 19, 2009, 4:45 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 61 counties

Barton County, KS, Cloud County, KS, Edwards County, KS, Ellis County, KS, Ellsworth County, KS, Finney County, KS, Ford County, KS, Hodgeman County, KS, Jewell County, KS, Lane County, KS, Lincoln County, KS, Mitchell County, KS, Ness County, KS, Osborne County, KS, Pawnee County, KS, Phillips County, KS, Republic County, KS, Rice County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Smith County, KS, Stafford County, KS, Trego County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Cedar County, NE, Clay County, NE, Fillmore County, NE, Franklin County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Turner County, SD, Yankton County, SD

The radar

The Grand Island radar (KUEX), 68 km from the middle of the area, began a volume at 19:47 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.8 hours before the alert went out and 181 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, Omaha, NE at 12:00Z on 2009-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 285 joules per kilogram.LCLLFCEL10008507005003002001001 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, Omaha, NE at 12:00Z on 2009-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939587897Sfc1 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
285 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

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 18, 8:41 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Finney, Gove, Grant, Gray and 17 more64 min
Aug 19, 4:02 PM CDTTornado WatchSPCBarber, Chautauqua, Comanche, Cowley, Harper, Sumner7 hr
Aug 19, 6:51 PM CDTMesoscale DiscussionSPCAtchison, Brown, Clay, Dickinson, Ellsworth, Geary and 13 more54 min
Aug 18, 9:41 PM CDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Custer, Holt, Hooker and 6 more64 min
Aug 19, 5:19 PM CDTMesoscale DiscussionSPCAdams, Burt, Butler, Cass, Clay, Colfax and 28 more26 min
Aug 19, 5:32 PM CDTSevere Thunderstorm WatchSPCBoone, Burt, Butler, Cass, Cedar, Clay and 32 more6 hr
Aug 19, 12:16 PM CDTMesoscale DiscussionSPCButte, Corson, Dewey, Harding, Meade, Perkins and 1 more119 min

Nearby

Mesoscale Discussions in Nebraska, 2009Mesoscale Discussions in Kansas, 2009Mesoscale Discussions in South Dakota, 2009Every mesoscale discussion in 2009

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.