Alert archive / Minnesota / Tornado Watches in 1999

Tornado Watch 626

August 9, 199920 counties in Iowa; 27 counties in Minnesota; 6 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at Aug 9, 1999, 6:30 PM CDT for 20 counties in Iowa; 27 counties in Minnesota; 6 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 1999, 6:30 PM CDT (23:30 UTC)
Expired
Aug 10, 1999, 12:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 53 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Hancock County, IA, Howard County, IA, Jones County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Blue Earth County, MN, Carver County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Buffalo County, WI, Crawford County, WI, La Crosse County, WI, Pierce County, WI, Trempealeau County, WI, Vernon County, WI

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 9, 6:39 PM CDTTornado WarningMPXLe Sueur36 min
Aug 9, 7:03 PM CDTTornado WarningMPXGoodhue42 min
Aug 9, 7:07 PM CDTTornado WarningMPXRice33 min
Aug 9, 7:14 PM CDTTornado WarningMPXLe Sueur31 min
Aug 9, 7:37 PM CDTTornado WarningMPXRice, Steele38 min
Aug 9, 7:41 PM CDTTornado WarningARXWabasha64 min
Aug 9, 7:42 PM CDTTornado WarningMPXGoodhue33 min
Aug 9, 8:00 PM CDTTornado WarningARXDodge60 min
Aug 9, 8:14 PM CDTTornado WarningMPXSteele31 min
Aug 9, 8:14 PM CDTTornado WarningMPXGoodhue31 min
Aug 9, 8:18 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn57 min
Aug 9, 8:36 PM CDTTornado WarningMPXFreeborn39 min
Aug 9, 8:42 PM CDTSevere Thunderstorm WarningDMXWinnebago63 min
Aug 9, 9:00 PM CDTTornado WarningDMXWinnebago, Worth35 min
Aug 9, 9:24 PM CDTTornado WarningDMXCerro Gordo46 min
Aug 9, 9:58 PM CDTSevere Thunderstorm WarningARXFloyd32 min
Aug 9, 10:10 PM CDTSevere Thunderstorm WarningDMXCerro Gordo35 min
Aug 9, 10:40 PM CDTSevere Thunderstorm WarningDMXButler35 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 96 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 1999-08-09Temperature 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, Minneapolis, MN at 12:00Z on 1999-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1057 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 2:30 AM CDTSevere Thunderstorm WatchSPCBig Stone, Chippewa, Clay, Douglas, Grant, Kandiyohi and 12 more6 hr

Nearby

Tornado Watches in Minnesota, 1999Tornado Watches in Iowa, 1999Tornado Watches in Wisconsin, 1999Every tornado watch in 1999

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.