Alert archive / Michigan / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 26, NWS Gaylord, MI

July 12, 1987Chippewa County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 12, 1987, 2:15 PM EDT for Chippewa County, Michigan. It was in force for 45 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1987, 2:15 PM EDT (18:15 UTC)
Expired
Jul 12, 1987, 3:00 PM EDT
In force
45 min
Issued by
NWS Gaylord, MI
Area
Whole counties

County Chippewa 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

Sault Ste Marie, MI (KSSM), launched 12:00Z, 6.3 hours before the alert went out and 24 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, Sault Ste Marie, MI at 12:00Z on 1987-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 44 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, Sault Ste Marie, MI at 12:00Z on 1987-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
44 J/kg
Mixed-layer CIN
-493 J/kg
Mixed-layer LCL
1000 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
65 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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 12, 1:21 PM EDT, 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALPENA MI
115 PM EDT SUN JUL 12 1987

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF EASTERN UPPER
MICHIGAN...PORTIONS OF NORTHERN AND WESTERN LOWER MICHIGAN...LAKE
MICHIGAN AND A SMALL PART OF NORTHWEST LAKE HURON.

THIS INCLUDES THE FOLLLOWING COUNTIES OF NORTHEAST LOWER MICHIGAN...
PRESQUE-ISLE AND MONTMORENCY...AND THE ADJOINING COASTAL WATERS FROM
MIDDLE ISLAND TO 20 MILES NORTHWEST OF HAMMOND BAY.

ALTHOUGH NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED...CONDITIONS
ARE SUCH THAT SEVERE WEATHER COULD OCCUR.

STAY TUNED TO YOUR LOCAL RADIO OR TV STATION...OR TO THE NOAA WEATHER
RkADIO FOR THE LATEST DEVELOPMENTS OF THIS WATCH AREA.
DS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 4:15 PM EDTSevere Thunderstorm WarningAPXChippewa45 min
Jul 12, 4:50 PM EDTTornado WarningAPXChippewa25 min
Jul 12, 5:12 PM EDTSevere Thunderstorm WarningAPXAlpena, Presque Isle63 min
Jul 12, 5:12 PM EDTSevere Thunderstorm WarningAPXMontmorency38 min
Jul 12, 5:15 PM EDTSevere Thunderstorm WarningAPXChippewa45 min
Jul 12, 5:41 PM EDTSevere Thunderstorm WarningAPXAlpena, Presque Isle49 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.