Alert archive / Michigan / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 37, NWS Gaylord, MI

July 20, 1987Alcona County, Iosco County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 20, 1987, 5:59 PM EDT for Alcona County, Iosco County, Michigan. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 20, 1987, 5:59 PM EDT (21:59 UTC)
Expired
Jul 20, 1987, 6:45 PM EDT
In force
46 min
Issued by
NWS Gaylord, MI
Area
Whole counties

Counties Alcona County, MI, Iosco County, MI

The radar

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

What was reported inside it

TimeReportWhereRemark
Jul 20, 6:10 PM EDTThunderstorm Wind 0Iosco, MI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Detroit, MI (KFNT), launched 12:00Z, 10.0 hours before the alert went out and 199 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, Detroit, MI at 12:00Z on 1987-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3198 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, Detroit, MI at 12:00Z on 1987-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
3198 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
697 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
101 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 20, 4:35 PM EDTSevere Thunderstorm WarningAPXGrand Traverse, Kalkaska, Missaukee, Wexford55 min
Jul 20, 4:51 PM EDTSevere Thunderstorm WarningAPXLake69 min
Jul 20, 4:57 PM EDTTornado WarningAPXKalkaska, Missaukee, Wexford33 min
Jul 20, 4:57 PM EDTTornado WarningAPXGrand Traverse28 min
Jul 20, 5:16 PM EDTTornado WarningAPXOsceola29 min
Jul 20, 5:27 PM EDTSevere Thunderstorm WarningAPXOscoda53 min
Jul 20, 5:42 PM EDTSevere Thunderstorm WarningAPXAlcona, Oscoda63 min
Jul 20, 6:26 PM EDTTornado WarningAPXAlcona34 min
Jul 20, 6:56 PM EDTSevere Thunderstorm WarningAPXAlcona, Alpena, Iosco64 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.