Alert archive / Iowa / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 765

September 3, 20058 counties in Iowa; 8 counties in Minnesota; 5 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Sep 3, 2005, 5:30 PM CDT for 8 counties in Iowa; 8 counties in Minnesota; 5 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Sep 3, 2005, 5:30 PM CDT (22:30 UTC)
Expired
Sep 3, 2005, 8:31 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 21 counties

Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Crawford County, WI, Grant County, WI, La Crosse County, WI, Monroe County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 65 km from the middle of the area, began a volume at 22:31 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

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

IssuedProductOfficeCountiesLasted
Sep 3, 5:36 PM CDTSevere Thunderstorm WarningMPXGoodhue, Steele54 min
Sep 3, 5:54 PM CDTSevere Thunderstorm WarningARXDodge53 min
Sep 3, 6:18 PM CDTSevere Thunderstorm WarningARXOlmsted57 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 267 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, Davenport, at 12:00Z on 2005-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 12:00Z on 2005-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2051 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
93 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
Sep 3, 4:00 AM CDTMesoscale DiscussionSPCClay, Grant, Norman, Traverse, Wilkin3 hr
Sep 3, 1:40 PM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Douglas and 22 more95 min
Sep 3, 2:20 PM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Carver, Chippewa, Dakota, Douglas and 24 more6 hr
Sep 3, 5:11 PM CDTMesoscale DiscussionSPCAnoka, Benton, Carver, Chippewa, Chisago, Dakota and 25 more64 min
Sep 3, 6:46 PM CDTMesoscale DiscussionSPCAnoka, Benton, Carver, Chippewa, Dakota, Douglas and 24 more89 min

Nearby

Severe Thunderstorm Watches in Iowa, 2005Severe Thunderstorm Watches in Minnesota, 2005Severe Thunderstorm Watches in Wisconsin, 2005Every severe thunderstorm watch 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.