Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1845

August 22, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2007, 9:12 AM MDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Aug 22, 2007, 9:12 AM MDT (15:12 UTC)
Expired
Aug 22, 2007, 10:45 AM MDT
In force
93 min
Issued by
the Storm Prediction Center
All 62 counties

Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Humboldt County, IA, Ida County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Woodbury County, IA, Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Burt County, NE, Cedar County, NE, Chase County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Deuel County, NE, Dixon County, NE, Dodge County, NE, Dundy County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Keith County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Nance County, NE, Perkins County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Clay County, SD, Union County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 82 km from the middle of the area, began a volume at 15:15 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, 3.2 hours before the alert went out and 283 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 2007-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1071 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 2007-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 square meters per square second.1939Sfc1 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
1071 J/kg
Mixed-layer CIN
-277 J/kg
Mixed-layer LCL
1229 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
89 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, 4:31 PM MDTMesoscale DiscussionSPCLarimer, Sedgwick, Weld89 min
Aug 22, 5:48 PM MDTSevere Thunderstorm WatchSPCArapahoe, Cheyenne, Crowley, Douglas, Elbert, El Paso and 6 more5 hr
Aug 21, 7:14 PM MDTSevere Thunderstorm WatchSPCAllamakee, Buchanan, Chickasaw, Clayton, Delaware, Dubuque and 5 more8 hr
Aug 21, 9:49 PM MDTMesoscale DiscussionSPCAllamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 37 more86 min
Aug 22, 1:13 AM MDTMesoscale DiscussionSPCJackson62 min
Aug 22, 5:45 AM MDTMesoscale DiscussionSPCBuena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more60 min
Aug 22, 1:37 PM MDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 40 more83 min
Aug 22, 2:20 PM MDTSevere Thunderstorm WatchSPCFremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more6 hr
Aug 22, 5:33 PM MDTMesoscale DiscussionSPCFremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more87 min
Aug 21, 7:28 PM MDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Custer, Dawson, Fillmore and 20 more92 min

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.