Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 938

May 31, 200724 counties in Iowa; 37 counties in Nebraska; Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 31, 2007, 4:56 PM CDT for 24 counties in Iowa; 37 counties in Nebraska; Union County, South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
May 31, 2007, 4:56 PM CDT (21:56 UTC)
Expired
May 31, 2007, 6:30 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 62 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Antelope County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Greeley County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Saunders County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Union County, SD

The radar

The Omaha radar (KOAX), 103 km from the middle of the area, began a volume at 21:56 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

Omaha, NE (KOAX), launched 12:00Z, 9.9 hours before the alert went out and 103 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 2007-05-31Temperature 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, Omaha, NE at 12:00Z on 2007-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 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
1305 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
109 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
May 31, 12:33 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Dawson, Franklin, Furnas and 9 more87 min
May 31, 1:01 PM CDTTornado WatchSPCChase, Dundy, Franklin, Frontier, Furnas, Gosper and 9 more9 hr
May 31, 3:28 PM CDTMesoscale DiscussionSPCAdams, Clay, Fillmore, Franklin, Furnas, Harlan and 6 more92 min
May 31, 5:20 PM CDTSevere Thunderstorm WatchSPCGage, Jefferson, Johnson, Lancaster, Nemaha, Otoe and 3 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in South Dakota, 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.