Alert archive / Wisconsin / Tornado Watches in 1998

Tornado Watch 359

May 15, 19988 counties in Michigan; 32 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at May 15, 1998, 8:30 PM EDT for 8 counties in Michigan; 32 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 15, 1998, 8:30 PM EDT (00:30 UTC)
Expired
May 16, 1998, 2:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 40 counties

Baraga County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dodge County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Iron County, WI, Juneau County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Sauk County, WI, Shawano County, WI, Sheboygan County, WI, Vilas County, WI, Washington County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 97 km from the middle of the area, began a volume at 00:29 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

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

IssuedProductOfficeCountiesLasted
May 15, 8:55 PM EDTSevere Thunderstorm WarningGRBMarathon, Portage55 min
May 15, 8:56 PM EDTSevere Thunderstorm WarningDLHAshland, Iron, Price59 min
May 15, 9:07 PM EDTSevere Thunderstorm WarningGRBWood63 min
May 15, 9:10 PM EDTSevere Thunderstorm WarningGRBOneida, Vilas65 min
May 15, 9:10 PM EDTSevere Thunderstorm WarningGRBLincoln65 min
May 15, 9:21 PM EDTSevere Thunderstorm WarningMKXDane, Sauk59 min
May 15, 9:26 PM EDTSevere Thunderstorm WarningMQTGogebic64 min
May 15, 9:48 PM EDTSevere Thunderstorm WarningGRBMarathon, Portage62 min
May 15, 10:07 PM EDTSevere Thunderstorm WarningMKXColumbia, Dane63 min
May 15, 10:46 PM EDTSevere Thunderstorm WarningMKXDodge, Jefferson, Walworth59 min
May 15, 10:53 PM EDTSevere Thunderstorm WarningGRBLanglade, Marathon47 min
May 15, 10:55 PM EDTSevere Thunderstorm WarningMKXFond du Lac, Green Lake60 min
May 15, 11:12 PM EDTSevere Thunderstorm WarningGRBWinnebago63 min
May 15, 11:38 PM EDTSevere Thunderstorm WarningMKXFond du Lac, Washington, Waukesha62 min
May 15, 11:43 PM EDTSevere Thunderstorm WarningGRBCalumet47 min
May 15, 11:50 PM EDTSevere Thunderstorm WarningGRBForest, Langlade, Menominee, Oconto65 min
May 15, 11:55 PM EDTSevere Thunderstorm WarningGRBBrown, Outagamie50 min
May 15, 11:57 PM EDTSevere Thunderstorm WarningMKXSheboygan63 min
May 16, 12:12 AM EDTSevere Thunderstorm WarningGRBManitowoc58 min
May 16, 12:28 AM EDTSevere Thunderstorm WarningGRBFlorence, Marinette32 min

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.5 hours before the alert went out and 99 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, Green Bay/Straub, WI at 00:00Z on 1998-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 577 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, Green Bay/Straub, WI at 00:00Z on 1998-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 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
577 J/kg
Mixed-layer CIN
-445 J/kg
Mixed-layer LCL
1364 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
195 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
May 15, 9:45 PM EDTTornado WatchSPCJefferson, Kenosha, Milwaukee, Racine, Rock, Walworth and 1 more4 hr

Nearby

Tornado Watches in Wisconsin, 1998Tornado Watches in Michigan, 1998Every tornado watch in 1998

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.