Alert archive / Michigan / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 20, NWS Gaylord, MI

July 11, 1987Leelanau County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 11, 1987, 6:00 PM EDT for Leelanau County, Michigan. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1987, 6:00 PM EDT (22:00 UTC)
Expired
Jul 11, 1987, 7:00 PM EDT
In force
60 min
Issued by
NWS Gaylord, MI
Area
Whole counties

County Leelanau County, MI

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.0 hours before the alert went out and 179 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 1987-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2044 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1987-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
2044 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
50 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.

The office that day

Everything else NWS Gaylord, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 11, 5:55 PM EDTSevere Thunderstorm WarningAPXMackinac65 min
Jul 11, 6:00 PM EDTSevere Thunderstorm WarningAPXAntrim60 min
Jul 11, 6:22 PM EDTSevere Thunderstorm WarningAPXKalkaska23 min
Jul 11, 6:40 PM EDTTornado WarningAPXChippewa30 min
Jul 11, 6:44 PM EDTSevere Thunderstorm WarningAPXPresque Isle61 min
Jul 11, 7:03 PM EDTSevere Thunderstorm WarningAPXMontmorency, Oscoda57 min
Jul 11, 7:19 PM EDTSevere Thunderstorm WarningAPXAlcona46 min
Jul 11, 7:19 PM EDTSevere Thunderstorm WarningAPXAlpena76 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1987Every severe thunderstorm warning in 1987

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.