Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1645

July 6, 200318 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2003, 4:33 AM CDT for 18 counties in Iowa. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2003, 4:33 AM CDT (09:33 UTC)
Expired: Jul 6, 2003, 6:00 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Adair County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Monona County, IA, Polk County, IA, Shelby County, IA, Union County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 64 km from the middle of the area, began a volume at 09:34 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, 9.6 hours before the alert went out and 163 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: 2840 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1471 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 11.5

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 5, 7:20 PM CDT	Tornado Watch	SPC	Fremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more	6 hr
Jul 5, 7:51 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 30 more	54 min
Jul 5, 8:04 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 2 more	86 min
Jul 5, 10:46 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 28 more	59 min
Jul 5, 10:57 PM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Monona, Montgomery, Page and 1 more	63 min
Jul 5, 11:50 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 36 more	5 hr
Jul 6, 2:26 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Black Hawk, Boone and 49 more	94 min
Jul 6, 5:17 AM CDT	Mesoscale Discussion	SPC	Allamakee, Cedar, Clinton, Dubuque, Jackson, Jones	118 min
Jul 6, 9:48 AM CDT	Mesoscale Discussion	SPC	Clinton, Des Moines, Jackson, Lee, Louisa, Muscatine and 1 more	117 min
Jul 6, 11:45 AM CDT	Tornado Watch	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 6 more	6 hr
Jul 6, 5:28 PM CDT	Mesoscale Discussion	SPC	Clinton, Dubuque, Jackson, Scott	62 min

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.