Alert archive / Minnesota / Mesoscale Discussions in 2003

Mesoscale Discussion 1907

July 20, 20035 counties in Iowa; 40 counties in Minnesota; Pierce County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 4:14 AM CDT for 5 counties in Iowa; 40 counties in Minnesota; Pierce County, Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 20, 2003, 4:14 AM CDT (09:14 UTC)
Expired
Jul 20, 2003, 6:45 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 46 counties

Howard County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Swift County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Pierce County, WI

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 09:16 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 9.2 hours before the alert went out and 112 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2003-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3136 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2003-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 125 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3136 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
125 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
2.9
Supercell composite
13.4

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.

IssuedProductOfficeCountiesLasted
Jul 20, 6:45 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Butler, Calhoun, Cerro Gordo, Cherokee, Clay and 22 more5 hr
Jul 20, 10:07 AM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 13 more53 min
Jul 20, 2:09 PM CDTMesoscale DiscussionSPCCrawford, Harrison, Monona, Plymouth, Pottawattamie, Shelby and 2 more66 min
Jul 20, 2:50 PM CDTTornado WatchSPCAdair, Adams, Audubon, Buena Vista, Carroll, Cass and 20 more6 hr
Jul 20, 5:29 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Carroll, Cass, Cherokee and 17 more91 min
Jul 19, 7:16 PM CDTMesoscale DiscussionSPCBeltrami, Clearwater, Itasca, Kittson, Koochiching, Marshall and 5 more89 min
Jul 19, 11:00 PM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 7 more5 hr
Jul 20, 1:15 AM CDTSevere Thunderstorm WatchSPCBig Stone, Chippewa, Cottonwood, Douglas, Grant, Jackson and 15 more6 hr
Jul 20, 2:03 AM CDTMesoscale DiscussionSPCBig Stone, Chippewa, Grant, Lac qui Parle, Lincoln, Lyon and 6 more117 min
Jul 20, 3:05 AM CDTSevere Thunderstorm WatchSPCBecker, Clay, Grant, Norman, Otter Tail, Wilkin4 hr
Jul 20, 1:16 PM CDTMesoscale DiscussionSPCBeltrami, Cook, Itasca, Koochiching, Lake, Lake of the Woods and 2 more119 min
Jul 20, 1:55 PM CDTSevere Thunderstorm WatchSPCCarlton, Lake, Saint Louis7 hr
Jul 20, 3:27 PM CDTMesoscale DiscussionSPCCarlton, Lake, Saint Louis63 min
Jul 20, 5:14 PM CDTMesoscale DiscussionSPCLincoln, Lyon, Murray, Pipestone, Rock, Yellow Medicine2 hr
Jul 20, 6:47 PM CDTMesoscale DiscussionSPCLake, Saint Louis88 min
Jul 20, 4:25 PM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 19 more5 hr
Jul 20, 6:23 PM CDTMesoscale DiscussionSPCKenosha, Racine, Rock, Walworth97 min

Nearby

Mesoscale Discussions in Minnesota, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Wisconsin, 2003Every 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.