Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 1868

July 25, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 4:53 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2005, 4:53 PM CDT (21:53 UTC)
Expired: Jul 25, 2005, 6:00 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 64 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone 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, Harrison County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Brown County, KS, Cloud County, KS, Jewell County, KS, Marshall County, KS, Nemaha County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 69 km from the middle of the area, began a volume at 21:52 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.

Severe Thunderstorm Watch 684Jul 25, 5:25 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.9 hours before the alert went out and 69 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: 300 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1458 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 315 m²/s²
0-3 km storm-relative helicity: 429 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Jul 24, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Black Hawk, Bremer, Buchanan, Chickasaw, Clayton, Delaware and 2 more	5 hr
Jul 24, 8:26 PM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Butler, Calhoun, Carroll, Cerro Gordo and 19 more	94 min
Jul 24, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	5 hr
Jul 24, 11:11 PM CDT	Mesoscale Discussion	SPC	Dubuque	64 min
Jul 24, 11:45 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	60 min
Jul 25, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Johnson and 7 more	7 hr
Jul 25, 1:31 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Dubuque, Henry, Jackson and 7 more	89 min
Jul 25, 1:55 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo and 32 more	2 hr
Jul 25, 3:30 PM CDT	Tornado Watch	SPC	Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee, Chickasaw and 19 more	7 hr
Jul 25, 4:40 PM CDT	Tornado Watch	SPC	Allamakee, Clayton, Fayette, Winneshiek	7 hr
Jul 25, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 17 more	4 hr
Jul 25, 6:56 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee and 18 more	94 min

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Kansas, 2005 Every 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.