Alert archive / Minnesota / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 171

May 9, 2004Lyon County, Sioux County, Iowa; 28 counties in Minnesota; 14 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2004, 2:30 PM CDT for Lyon County, Sioux County, Iowa; 28 counties in Minnesota; 14 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2004, 2:30 PM CDT (19:30 UTC)
Expired
May 9, 2004, 8:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 44 counties

Lyon County, IA, Sioux County, IA, Benton County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Murray County, MN, Nobles County, MN, Pine County, MN, Pipestone County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Sherburne County, MN, Stearns County, MN, Swift County, MN, Todd County, MN, Wright County, MN, Yellow Medicine County, MN, Bon Homme County, SD, Brookings County, SD, Deuel County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 87 km from the middle of the area, began a volume at 19:34 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.

Warnings issued inside it

14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 9, 2:31 PM CDTSevere Thunderstorm WarningMPXSwift59 min
May 9, 2:59 PM CDTSevere Thunderstorm WarningMPXPope31 min
May 9, 3:21 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Stearns54 min
May 9, 3:29 PM CDTSevere Thunderstorm WarningMPXSwift31 min
May 9, 3:31 PM CDTTornado WarningMPXKandiyohi29 min
May 9, 3:51 PM CDTSevere Thunderstorm WarningMPXSherburne, Wright54 min
May 9, 3:59 PM CDTTornado WarningMPXKandiyohi31 min
May 9, 4:05 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns55 min
May 9, 4:13 PM CDTTornado WarningMPXMeeker, Stearns47 min
May 9, 4:40 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Wright65 min
May 9, 4:49 PM CDTTornado WarningMPXAnoka, Sherburne, Wright26 min
May 9, 4:58 PM CDTSevere Thunderstorm WarningMPXMcLeod47 min
May 9, 5:26 PM CDTSevere Thunderstorm WarningMPXChisago, Isanti64 min
May 9, 5:48 PM CDTSevere Thunderstorm WarningMPXMcLeod42 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 7.5 hours before the alert went out and 183 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, Aberdeen, SD at 12:00Z on 2004-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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, Aberdeen, SD at 12:00Z on 2004-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 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
17 J/kg
Mixed-layer CIN
-338 J/kg
Mixed-layer LCL
2332 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 7:54 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Carroll, Cass, Clarke and 19 more2 hr
May 8, 8:25 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Allamakee, Appanoose, Audubon, Benton and 58 more6 hr
May 8, 10:44 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Clarke, Decatur, Fremont and 12 more2 hr
May 9, 1:22 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Cass, Cedar, Clarke and 30 more23 min
May 9, 4:46 PM CDTMesoscale DiscussionSPCAllamakee, Buchanan, Clayton, Clinton, Delaware, Dubuque and 4 more59 min
May 9, 5:38 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Lyon, Osceola, Sioux2 hr
May 9, 2:00 PM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Kandiyohi and 19 more3 hr
May 9, 3:29 PM CDTMesoscale DiscussionSPCChisago, Dakota, Goodhue, Hennepin, Le Sueur, Ramsey and 4 more91 min
May 9, 3:55 PM CDTTornado WatchSPCAnoka, Blue Earth, Brown, Carver, Dakota, Dodge and 24 more5 hr
May 8, 7:15 PM CDTSevere Thunderstorm WatchSPCBrown, Buffalo, Campbell, Corson, Dewey, Edmunds and 20 more6 hr
May 8, 9:17 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bennett, Brown, Brule, Buffalo and 32 more88 min
May 9, 3:30 PM CDTSevere Thunderstorm WatchSPCClay, Union6 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2004Severe Thunderstorm Watches in South Dakota, 2004Severe Thunderstorm Watches in Iowa, 2004Every severe thunderstorm watch 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.