Alert archive / Michigan / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 43, NWS Gaylord, MI

July 31, 1999Mackinac County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 31, 1999, 12:08 AM EDT for Mackinac County, Michigan. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 31, 1999, 12:08 AM EDT (04:08 UTC)
Expired: Jul 31, 1999, 1:10 AM EDT
In force: 62 min
Issued by: NWS Gaylord, MI
Area: Whole counties

County Mackinac County, MI

The radar

The NCL Michigan radar (KAPX), 107 km from the middle of the area, began a volume at 04:08 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 12:00 AM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 4.1 hours before the alert went out and 205 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 753 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

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.

NWS Gaylord, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 9:35 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jul 30, 9:35 PM EDT, 2 hours 33 minutes before

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In the hours before

Special weather statement, Jul 30, 11:57 PM EDT, 11 minutes before

MIZ008-015>036-041-042-310900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
1157 PM EDT FRI JUL 30 1999

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH
EFFECTIVE THROUGH 500 AM FOR THE FOLLOWING LOCATIONS...

IN UPPER MICHIGAN

   ...CHIPPEWA... MACKINAC

IN LOWER MICHIGAN

   ...EMMET... CHEBOYGAN... PRESQUE ISLE... CHARLEVOIX... LEELANAU
   ...ANTRIM... OTSEGO... MONTMORENCY... ALPENA... BENZIE
   ...GRAND TRAVERSE... KALKASKA... CRAWFORD... OSCODA... ALCONA
   ...MANISTEE... WEXFORD... MISSAUKEE... ROSCOMMON... OGEMAW... IOSCO
   ...GLADWIN... ARENAC

A LINE OF STRONG TO SEVERE THUNDERSTORMS EXTENDING FROM CENTRAL UPPER
MICHIGAN TO EASTERN WISCONSIN AT MIDNIGHT WILL MOVE EAST AROUND
30 MPH AND REACH A SAULT STE MARIE TO CHARLEVOIX TO TRAVERSE CITY LINE
BETWEEN 200 AND 400 AM. THESE THUNDERSTORMS WILL THEN CONTINUE EAST
AND AFFECT NORTH CENTRAL AND NORTHEAST LOWER MICHIGAN TOWARD DAYBREAK.

THE PRIMARY SEVERE WEATHER THREAT FROM THESE SQUALL LINE THUNDERSTORMS
WILL BE WITH DAMAGING WIND GUSTS BETWEEN 60 AND 70 MPH.

A SEVERE THUNDERSTORM WATCH MEANS SEVERE THUNDERSTORMS ARE POSSIBLE
IN AND NEAR THE WATCH AREA. PERSONS SHOULD REMAIN ALERT FOR
THREATENING WEATHER AND LISTEN TO NOAA WEATHER RADIO...COMMERCIAL
RADIO...OR TELEVISION FOR FURTHER INFORMATION.

HURLEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 1:21 AM EDT	Severe Thunderstorm Warning	APX	Chippewa	94 min
Jul 31, 1:34 AM EDT	Flash Flood Warning	APX	Mackinac	3 hr
Jul 31, 1:42 AM EDT	Severe Thunderstorm Warning	APX	Leelanau	63 min
Jul 31, 2:08 AM EDT	Severe Thunderstorm Warning	APX	Charlevoix, Emmet	82 min
Jul 31, 2:08 AM EDT	Severe Thunderstorm Warning	APX	Antrim	82 min
Jul 31, 2:11 AM EDT	Severe Thunderstorm Warning	APX	Grand Traverse	64 min
Jul 31, 2:13 AM EDT	Severe Thunderstorm Warning	APX	Kalkaska	77 min
Jul 31, 2:27 AM EDT	Severe Thunderstorm Warning	APX	Cheboygan, Crawford, Otsego	78 min
Jul 31, 2:50 AM EDT	Severe Thunderstorm Warning	APX	Montmorency, Presque Isle	75 min
Jul 31, 2:50 AM EDT	Severe Thunderstorm Warning	APX	Mackinac	60 min
Jul 31, 3:06 AM EDT	Severe Thunderstorm Warning	APX	Chippewa	69 min
Jul 31, 3:18 AM EDT	Severe Thunderstorm Warning	APX	Wexford	37 min
Jul 31, 3:23 AM EDT	Severe Thunderstorm Warning	APX	Missaukee	47 min
Jul 31, 3:31 AM EDT	Severe Thunderstorm Warning	APX	Kalkaska	44 min
Jul 31, 3:41 AM EDT	Severe Thunderstorm Warning	APX	Crawford	59 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1999 Every severe thunderstorm warning in 1999

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.