Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 843

May 12, 20054 states

The Storm Prediction Center issued this mesoscale discussion at May 12, 2005, 3:48 PM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 12, 2005, 3:48 PM CDT (20:48 UTC)
Expired
May 12, 2005, 5:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 73 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Douglas County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Marshall County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Cass County, MO, Clay County, MO, Holt County, MO, Jackson County, MO, Nodaway County, MO, Platte County, MO, Butler County, NE, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 20:51 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

Topeka, KS (KTOP), launched 12:00Z, 8.8 hours before the alert went out and 235 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, Topeka, KS at 12:00Z on 2005-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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, Topeka, KS at 12:00Z on 2005-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 418 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
47 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
1153 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
418 m²/s²
0-3 km storm-relative helicity
395 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 12, 3:44 AM CDTMesoscale DiscussionSPCFremont61 min
May 12, 12:40 PM CDTMesoscale DiscussionSPCFremont, Page95 min
May 12, 1:55 PM CDTTornado WatchSPCFremont, Mills, Montgomery, Page, Pottawattamie7 hr
May 11, 8:01 PM CDTMesoscale DiscussionSPCCheyenne, Clark, Decatur, Finney, Ford, Gove and 24 more59 min
May 11, 9:26 PM CDTMesoscale DiscussionSPCDecatur, Ellis, Finney, Gove, Graham, Grant and 15 more64 min
May 11, 9:50 PM CDTTornado WatchSPCClark, Decatur, Edwards, Ellis, Finney, Ford and 28 more7 hr
May 11, 11:02 PM CDTMesoscale DiscussionSPCBrown, Marshall, Nemaha58 min
May 12, 1:16 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 21 more59 min
May 12, 1:35 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 29 more7 hr
May 12, 3:13 PM CDTMesoscale DiscussionSPCBarber, Barton, Clay, Cloud, Comanche, Dickinson and 28 more92 min
May 12, 5:18 PM CDTMesoscale DiscussionSPCBarber, Butler, Cowley, Harper, Harvey, Kingman and 2 more57 min
May 12, 5:55 PM CDTSevere Thunderstorm WatchSPCBarber, Butler, Chase, Coffey, Comanche, Cowley and 14 more7 hr
May 12, 6:37 PM CDTMesoscale DiscussionSPCCaldwell, Carroll, Chariton, Clay, Clinton, Cooper and 13 more83 min
May 12, 6:55 PM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Boone, Caldwell, Callaway, Carroll and 32 more6 hr
May 11, 7:02 PM CDTMesoscale DiscussionSPCAdams, Arthur, Boone, Buffalo, Butler, Chase and 33 more88 min
May 11, 11:50 PM CDTSevere Thunderstorm WatchSPCAdams, Boone, Buffalo, Butler, Cass, Clay and 30 more5 hr

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Kansas, 2005Mesoscale Discussions in Nebraska, 2005Every mesoscale discussion in 2005

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.