Alert archive / Wisconsin / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 735

September 19, 199710 counties in Michigan; Dakota County, Minnesota; 22 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Sep 19, 1997, 1:00 AM EDT for 10 counties in Michigan; Dakota County, Minnesota; 22 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 19, 1997, 1:00 AM EDT (05:00 UTC)
Expired
Sep 19, 1997, 7:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 33 counties

Alger County, MI, Charlevoix County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Iron County, MI, Luce County, MI, Mackinac County, MI, Menominee County, MI, Schoolcraft County, MI, Dakota County, MN, Chippewa County, WI, Clark County, WI, Door County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Shawano County, WI, Taylor County, WI, Vilas County, WI

The radar

The Green Bay radar (KGRB), 135 km from the middle of the area, began a volume at 05:04 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.0 hours before the alert went out and 344 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 00:00Z on 1997-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1943 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 00:00Z on 1997-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 square meters per square second.1939587897117Sfc1 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
1943 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
399 m²/s²
Significant tornado parameter
2.1
Supercell composite
8.4

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
Sep 18, 8:30 PM EDTSevere Thunderstorm WatchSPCAlger, Baraga, Charlevoix, Cheboygan, Chippewa, Delta and 11 more7 hr
Sep 19, 3:15 PM EDTSevere Thunderstorm WatchSPCAllegan, Barry, Branch, Calhoun, Cass, Clinton and 24 more6 hr
Sep 18, 10:15 PM EDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 28 more7 hr
Sep 19, 12:00 PM EDTSevere Thunderstorm WatchSPCGrant, Green, Jefferson, Kenosha, Lafayette, Milwaukee and 4 more5 hr

Nearby

Severe Thunderstorm Watches in Wisconsin, 1997Severe Thunderstorm Watches in Michigan, 1997Severe Thunderstorm Watches in Minnesota, 1997Every severe thunderstorm watch in 1997

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.