Alert archive / Nebraska / Mesoscale Discussions in 2009

Mesoscale Discussion 238

March 23, 200949 counties in Nebraska; Gregory County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2009, 10:13 AM CDT for 49 counties in Nebraska; Gregory County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 23, 2009, 10:13 AM CDT (15:13 UTC)
Expired
Mar 23, 2009, 12:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 50 counties

Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Butler County, NE, Cherry County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Keya Paha County, NE, Knox County, NE, Lancaster County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Gregory County, SD

The radar

The North Platte radar (KLNX), 105 km from the middle of the area, began a volume at 15:14 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 3.2 hours before the alert went out and 131 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 12:00Z on 2009-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 766 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, N. Platte/Lee Bi, NE at 12:00Z on 2009-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.19395878Sfc1 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
766 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
773 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.2

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
Mar 23, 12:16 PM CDTTornado WatchSPCAdams, Antelope, Blaine, Boone, Boyd, Brown and 46 more4 hr
Mar 23, 3:11 PM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Brown, Burt, Butler and 44 more94 min
Mar 23, 3:50 PM CDTTornado WatchSPCAntelope, Burt, Butler, Cass, Cedar, Colfax and 25 more6 hr
Mar 23, 6:04 PM CDTMesoscale DiscussionSPCCass, Douglas, Nemaha, Otoe, Richardson, Sarpy and 1 more116 min
Mar 22, 11:28 PM CDTMesoscale DiscussionSPCBrookings, Deuel, Grant3 hr
Mar 23, 4:59 AM CDTMesoscale DiscussionSPCButte, Custer, Harding, Lawrence6 hr
Mar 23, 12:06 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade, Pennington, Perkins5 hr
Mar 23, 6:56 PM CDTMesoscale DiscussionSPCButte, Campbell, Corson, Custer, Dewey, Haakon and 13 more3 hr

Nearby

Mesoscale Discussions in Nebraska, 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.