Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1867

August 23, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 3:57 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2007, 3:57 PM CDT (20:57 UTC)
Expired: Aug 23, 2007, 5:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 84 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Brown County, KS, Marshall County, KS, Nemaha County, KS, Republic County, KS, Washington County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Clark County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Knox County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Cass County, NE, 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 Des Moines radar (KDMX), 54 km from the middle of the area, began a volume at 20:58 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 239 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 51 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 586 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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.

Issued	Product	Office	Counties	Lasted
Aug 23, 10:36 AM CDT	Mesoscale Discussion	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 8 more	114 min
Aug 23, 5:38 PM CDT	Mesoscale Discussion	SPC	Clinton, Muscatine, Scott	97 min
Aug 23, 5:49 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 13 more	6 hr
Aug 22, 9:11 PM CDT	Mesoscale Discussion	SPC	Greeley, Logan, Sherman, Wallace, Wichita	94 min
Aug 23, 3:31 PM CDT	Mesoscale Discussion	SPC	Grant, Hamilton, Kearny, Morton, Stanton, Stevens	2 hr
Aug 23, 4:12 PM CDT	Mesoscale Discussion	SPC	Edwards, Ford, Gray, Haskell, Hodgeman, Meade and 5 more	2 hr
Aug 23, 6:04 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Clark, Edwards, Ellis, Ellsworth, Finney and 24 more	6 hr

Nearby

Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Missouri, 2007 Mesoscale Discussions in Nebraska, 2007 Every 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.