Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 1863

July 25, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 1:55 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2005, 1:55 PM CDT (18:55 UTC)
Expired
Jul 25, 2005, 4:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 75 counties

Black Hawk County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Redwood County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Thurston County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Union County, SD

The radar

The Des Moines radar (KDMX), 150 km from the middle of the area, began a volume at 18:56 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 12:00Z, 6.9 hours before the alert went out and 206 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 12:00Z on 2005-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 789 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 12:00Z on 2005-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.193958Sfc1 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
789 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1163 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

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 24, 8:20 PM CDTSevere Thunderstorm WatchSPCBlack Hawk, Bremer, Buchanan, Chickasaw, Clayton, Delaware and 2 more5 hr
Jul 24, 8:26 PM CDTMesoscale DiscussionSPCBoone, Buena Vista, Butler, Calhoun, Carroll, Cerro Gordo and 19 more94 min
Jul 24, 9:45 PM CDTSevere Thunderstorm WatchSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux5 hr
Jul 24, 11:11 PM CDTMesoscale DiscussionSPCDubuque64 min
Jul 24, 11:45 PM CDTMesoscale DiscussionSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux60 min
Jul 25, 10:05 AM CDTSevere Thunderstorm WatchSPCCedar, Clinton, Des Moines, Henry, Jackson, Johnson and 7 more7 hr
Jul 25, 1:31 PM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Dubuque, Henry, Jackson and 7 more89 min
Jul 25, 3:30 PM CDTTornado WatchSPCBremer, Buena Vista, Butler, Cerro Gordo, Cherokee, Chickasaw and 19 more7 hr
Jul 25, 4:40 PM CDTTornado WatchSPCAllamakee, Clayton, Fayette, Winneshiek7 hr
Jul 25, 4:53 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Calhoun, Carroll and 20 more67 min
Jul 25, 5:25 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Calhoun, Carroll and 17 more4 hr
Jul 25, 6:56 PM CDTMesoscale DiscussionSPCAllamakee, Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee and 18 more94 min
Jul 25, 4:22 PM CDTMesoscale DiscussionSPCWinona23 min
Jul 24, 7:13 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade, Perkins2 hr
Jul 24, 9:53 PM CDTMesoscale DiscussionSPCBennett, Custer, Fall River, Jackson, Oglala Lakota, Pennington67 min
Jul 24, 10:00 PM CDTSevere Thunderstorm WatchSPCBennett, Custer, Fall River, Haakon, Jackson, Lawrence and 2 more4 hr
Jul 24, 11:23 PM CDTMesoscale DiscussionSPCBennett, Custer, Fall River, Haakon, Jackson, Lawrence and 2 more67 min
Jul 25, 2:39 AM CDTMesoscale DiscussionSPCButte, Corson, Harding, Perkins2 hr

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Minnesota, 2005Mesoscale Discussions in Nebraska, 2005Every mesoscale discussion in 2005

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.