Alert archive / Michigan / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 69, NWS Gaylord, MI

August 1, 2002Montmorency County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 1, 2002, 8:22 PM EDT for Montmorency County, Michigan. It was in force for 38 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 1, 2002, 8:22 PM EDT (00:22 UTC)
Expired: Aug 1, 2002, 9:00 PM EDT
In force: 38 min
Issued by: NWS Gaylord, MI
Area: Counties, with a storm outline in the text

County Montmorency County, MI

What was reported inside it

Time	Report	Where	Remark
Aug 1, 8:40 PM EDT	Thunderstorm Wind 50 M	Atlanta, 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 1, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 1, 6:30 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 0.4 hours before the alert went out and 142 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: 3404 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 284 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 5.8
Supercell composite: 27.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

433 
WUUS53 KAPX 020022
SVRAPN
MIC119-020100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
821 PM EDT THU AUG 1 2002

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONTMORENCY COUNTY IN NORTHEAST LOWER MICHIGAN

* UNTIL 900 PM EDT

* AT 818 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM OVER LEWISTON AND TWIN LAKE...MOVING EAST AT 
  45 MPH.

* THE SEVERE THUNDERSTORM WILL REACH...
  LOCKWOOD LAKE AROUND 845 PM EDT

REMAIN INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. THIS
STORM IS CAPABLE OF PRODUCING WIND GUSTS BETWEEN 60 AND 80 MPH ALONG
WITH DIME SIZED OR LARGER HAIL. WINDS THIS HIGH CAN DOWN TREES AND
POWER LINES.

LAT...LON 4492 8435 4486 8435 4486 8389 4495 8390
          4497 8434

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 8:46 PM EDT	Special Marine Warning	APX		2 hr
Aug 1, 8:46 PM EDT	Special Marine Warning	APX		2 hr

Nearby

Severe Thunderstorm Warnings in Michigan, 2002 Every severe thunderstorm warning in 2002

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.