Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1875

August 23, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 7:55 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 23, 2007, 7:55 PM CDT (00:55 UTC)
Expired
Aug 23, 2007, 10:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 60 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Cass County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Worth County, MO, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Thayer County, NE

The radar

The Topeka radar (KTWX), 151 km from the middle of the area, began a volume at 00:58 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 (KFOE), launched 00:00Z, 0.9 hours before the alert went out and 129 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 00:00Z on 2007-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1471 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 00:00Z on 2007-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
1471 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1851 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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 23, 7:10 PM CDTSevere Thunderstorm WatchSPCDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 4 more5 hr
Aug 23, 7:47 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Cass, Clarke, Davis and 17 more118 min
Aug 23, 11:01 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Davis, Decatur and 17 more119 min
Aug 23, 11:07 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Louisa, Washington53 min
Aug 23, 7:18 PM CDTMesoscale DiscussionSPCCheyenne, Greeley, Logan, Rawlins, Sherman, Thomas and 1 more117 min
Aug 23, 7:39 PM CDTMesoscale DiscussionSPCBarton, Clark, Edwards, Ellis, Ellsworth, Finney and 24 more2 hr
Aug 24, 3:05 AM CDTMesoscale DiscussionSPCAtchison, Doniphan115 min
Aug 24, 1:31 PM CDTMesoscale DiscussionSPCCherokee89 min
Aug 24, 11:12 AM CDTMesoscale DiscussionSPCBollinger, Camden, Cape Girardeau, Christian, Cole, Crawford and 34 more93 min
Aug 24, 12:19 PM CDTSevere Thunderstorm WatchSPCAudrain, Boone, Callaway, Camden, Cole, Crawford and 31 more8 hr
Aug 24, 2:44 PM CDTMesoscale DiscussionSPCCrawford, Dent, Franklin, Jefferson, Laclede, Maries and 11 more91 min
Aug 24, 5:50 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Carter, Crawford, Dent, Franklin and 21 more85 min

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Kansas, 2007Mesoscale Discussions in Missouri, 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.