Alert archive / Michigan / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 88

April 18, 20049 counties in Michigan; Langlade County, Marinette County, Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2004, 9:45 PM EDT for 9 counties in Michigan; Langlade County, Marinette County, Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2004, 9:45 PM EDT (01:45 UTC)
Expired
Apr 19, 2004, 2:00 AM EDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Alger County, MI, Charlevoix County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Luce County, MI, Mackinac County, MI, Menominee County, MI, Schoolcraft County, MI, Langlade County, WI, Marinette County, WI

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 18, 10:04 PM EDTSevere Thunderstorm WarningMQTDickinson, Marquette71 min

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 00:00Z, 1.8 hours before the alert went out and 156 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 2004-04-19Temperature 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, Green Bay/Straub, WI at 00:00Z on 2004-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 353 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1620 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
353 m²/s²
0-3 km storm-relative helicity
458 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 9:28 PM EDTMesoscale DiscussionSPCAlger, Baraga, Delta, Dickinson, Iron, Luce and 4 more92 min
Apr 18, 10:45 PM EDTTornado WatchSPCAdams, Buffalo, Crawford, Eau Claire, Grant, Jackson and 13 more4 hr
Apr 19, 12:12 AM EDTMesoscale DiscussionSPCAdams, Buffalo, Crawford, Jackson, Juneau, La Crosse and 11 more93 min

Nearby

Severe Thunderstorm Watches in Michigan, 2004Severe Thunderstorm Watches in Wisconsin, 2004Every severe thunderstorm watch in 2004

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.