Alert archive / Wisconsin / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 249

June 30, 201811 counties in Michigan; 27 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2018, 5:41 PM EDT for 11 counties in Michigan; 27 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 30, 2018, 5:41 PM EDT (21:41 UTC)
Expired
Jul 1, 2018, 12:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 38 counties

Alger County, MI, Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Schoolcraft County, MI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Florence County, WI, Forest County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Lafayette County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Sauk County, WI, Shawano County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 67 km from the middle of the area, began a volume at 21:41 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 30, 5:44 PM EDTSevere Thunderstorm WarningMQTBaraga, Marquette46 min
Jun 30, 5:58 PM EDTSevere Thunderstorm WarningGRBOneida, Vilas62 min
Jun 30, 6:03 PM EDTSevere Thunderstorm WarningMQTMarquette42 min
Jun 30, 6:41 PM EDTSevere Thunderstorm WarningMQTMarquette19 min
Jun 30, 6:51 PM EDTSevere Thunderstorm WarningMQTMarquette17 min
Jun 30, 7:01 PM EDTSevere Thunderstorm WarningMQTGogebic, Iron, Ontonagon44 min
Jun 30, 7:06 PM EDTSevere Thunderstorm WarningMKXSauk24 min
Jun 30, 7:26 PM EDTSevere Thunderstorm WarningMKXSauk49 min
Jun 30, 7:28 PM EDTSevere Thunderstorm WarningMQTHoughton47 min
Jun 30, 7:36 PM EDTSevere Thunderstorm WarningMQTMarquette11 min
Jun 30, 7:53 PM EDTSevere Thunderstorm WarningMKXColumbia, Green Lake, Marquette, Sauk37 min
Jun 30, 8:30 PM EDTSevere Thunderstorm WarningMQTGogebic, Ontonagon22 min
Jun 30, 8:38 PM EDTSevere Thunderstorm WarningMKXDane, Green, Iowa, Lafayette52 min
Jun 30, 9:48 PM EDTSevere Thunderstorm WarningMQTDickinson27 min
Jun 30, 10:22 PM EDTFlash Flood WarningMQTAlger, Dickinson, Marquette6 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.7 hours before the alert went out and 69 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 12:00Z on 2018-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2313 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 12:00Z on 2018-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 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
2313 J/kg
Mixed-layer CIN
-238 J/kg
Mixed-layer LCL
1072 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 1:40 PM EDTMesoscale DiscussionSPCBuena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee, Chickasaw and 26 more3 hr
Jun 30, 2:39 PM EDTSevere Thunderstorm WatchSPCAdair, Adams, Allamakee, Audubon, Boone, Bremer and 46 more7 hr
Jun 30, 4:40 PM EDTMesoscale DiscussionSPCAudubon, Boone, Butler, Calhoun, Carroll, Cass and 25 more2 hr
Jun 30, 5:40 PM EDTMesoscale DiscussionSPCRinggold, Taylor95 min
Jun 30, 7:09 PM EDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page96 min
Jun 30, 4:21 AM EDTMesoscale DiscussionSPCBaraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 2 more114 min
Jun 30, 5:23 PM EDTMesoscale DiscussionSPCBaraga, Dickinson, Gogebic, Houghton, Iron, Marquette and 2 more67 min
Jun 30, 12:56 AM EDTSevere Thunderstorm WatchSPCBayfield, Douglas5 hr

Nearby

Severe Thunderstorm Watches in Wisconsin, 2018Severe Thunderstorm Watches in Michigan, 2018Every severe thunderstorm watch in 2018

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.