Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1848

July 14, 200313 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2003, 9:24 PM CDT for 13 counties in Iowa. It was in force for 36 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2003, 9:24 PM CDT (02:24 UTC)
Expired: Jul 14, 2003, 10:00 PM CDT
In force: 36 min
Issued by: the Storm Prediction Center

Counties Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Humboldt County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 76 km from the middle of the area, began a volume at 02:23 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 00:00Z, 2.4 hours before the alert went out and 188 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: 4038 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1765 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.7

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 14, 7:16 PM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Clayton, Fayette, Howard, Mitchell and 1 more	119 min
Jul 14, 7:40 PM CDT	Tornado Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Fayette and 12 more	4 hr
Jul 14, 11:05 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 22 more	55 min
Jul 15, 2:40 AM CDT	Mesoscale Discussion	SPC	Clinton, Davis, Des Moines, Henry, Jefferson, Lee and 6 more	3 hr

Nearby

Mesoscale Discussions in Iowa, 2003 Every mesoscale discussion in 2003

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.