Alert archive / Wisconsin / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 642

July 30, 20014 counties in Minnesota; 11 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2001, 3:30 PM CDT for 4 counties in Minnesota; 11 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 30, 2001, 3:30 PM CDT (20:30 UTC)
Expired
Jul 30, 2001, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Fillmore County, MN, Houston County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 79 km from the middle of the area, began a volume at 20:34 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

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

IssuedProductOfficeCountiesLasted
Jul 30, 3:41 PM CDTSevere Thunderstorm WarningARXClark64 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 205 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 2001-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3565 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 2001-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 196 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
3565 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
196 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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.

Nearby

Severe Thunderstorm Watches in Wisconsin, 2001Severe Thunderstorm Watches in Minnesota, 2001Every severe thunderstorm watch in 2001

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.