Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 609

May 8, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 10:44 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 8, 2004, 10:44 PM CDT (03:44 UTC)
Expired: May 9, 2004, 12:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 53 counties

Adair County, IA, Adams County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Madison County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Brown County, KS, Cloud County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE

The radar

The Omaha radar (KOAX), 94 km from the middle of the area, began a volume at 03:47 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, 3.7 hours before the alert went out and 94 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: 2163 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 2150 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 104 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
May 8, 7:54 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Clarke and 19 more	2 hr
May 8, 8:25 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Allamakee, Appanoose, Audubon, Benton and 58 more	6 hr
May 9, 1:22 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Cedar, Clarke and 30 more	23 min
May 9, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Lyon, Sioux	6 hr
May 9, 4:46 PM CDT	Mesoscale Discussion	SPC	Allamakee, Buchanan, Clayton, Clinton, Delaware, Dubuque and 4 more	59 min
May 9, 5:38 PM CDT	Mesoscale Discussion	SPC	Dickinson, Emmet, Lyon, Osceola, Sioux	2 hr
May 9, 2:42 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Greeley, Logan, Rawlins, Sherman and 3 more	3 hr
May 9, 3:07 PM CDT	Mesoscale Discussion	SPC	Morton, Stevens	2 hr
May 9, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	Decatur, Gove, Graham, Logan, Norton, Phillips and 7 more	6 hr
May 8, 9:17 PM CDT	Mesoscale Discussion	SPC	Boyd	88 min
May 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Butler and 37 more	2 hr

Nearby

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