Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 2204

September 14, 200429 counties in Iowa; 28 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 14, 2004, 1:47 PM CDT for 29 counties in Iowa; 28 counties in Nebraska. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Sep 14, 2004, 1:47 PM CDT (18:47 UTC)
Expired: Sep 14, 2004, 3:15 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 57 counties

Adair County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Ida County, IA, Jasper County, IA, Madison County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Polk County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Warren County, IA, Webster County, IA, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 18 km from the middle of the area, began a volume at 18:50 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 819Sep 14, 2:45 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.8 hours before the alert went out and 18 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: 102 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1304 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Sep 13, 8:59 PM CDT	Mesoscale Discussion	SPC	Lyon, O'Brien, Osceola, Plymouth, Sioux	61 min
Sep 14, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 33 more	7 hr
Sep 14, 5:14 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 32 more	2 hr
Sep 14, 2:49 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 16 more	116 min
Sep 14, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Chase, Cheyenne, Deuel, Dundy and 4 more	7 hr
Sep 14, 6:44 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Banner, Blaine, Boone, Buffalo and 47 more	91 min

Nearby

Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Nebraska, 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.