Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 879

May 24, 200430 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at May 24, 2004, 7:27 PM CDT for 30 counties in Iowa. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 24, 2004, 7:27 PM CDT (00:27 UTC)
Expired: May 24, 2004, 8:30 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 30 counties

Appanoose County, IA, Boone County, IA, Butler County, IA, Cerro Gordo County, IA, Davis County, IA, Emmet County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 74 km from the middle of the area, began a volume at 00:29 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, 0.5 hours before the alert went out and 294 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 508 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -118 m²/s²
0-3 km storm-relative helicity: -81 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.

Issued	Product	Office	Counties	Lasted
May 24, 8:15 PM CDT	Mesoscale Discussion	SPC	Appanoose, Davis, Lee, Van Buren, Wayne	90 min
May 24, 9:06 PM CDT	Mesoscale Discussion	SPC	Appanoose, Boone, Butler, Cerro Gordo, Davis, Emmet and 26 more	54 min

Nearby

Mesoscale Discussions in Iowa, 2004 Every mesoscale discussion in 2004

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.