Alert archive / Michigan / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 4, NWS Gaylord, MI

April 6, 1997Roscommon County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Apr 6, 1997, 1:40 PM EDT for Roscommon County, Michigan. It was in force for 60 min. 2 reports 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: Apr 6, 1997, 1:40 PM EDT (17:40 UTC)
Expired: Apr 6, 1997, 2:40 PM EDT
In force: 60 min
Issued by: NWS Gaylord, MI
Area: Whole counties

County Roscommon County, MI

The radar

The NCL Michigan radar (KAPX), 64 km from the middle of the area, began a volume at 17:36 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.

What was reported inside it

Time	Report	Where	Remark
Apr 6, 2:05 PM EDT	Thunderstorm Wind 52	Higgins Lake, MI
Apr 6, 2:39 PM EDT	Hail 0.75	St Helen, 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
Apr 6, 1:00 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 5.7 hours before the alert went out and 193 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 782 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 295 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAPN 061740 RRA
SVRAPN
MIZ538-MIC031-137-143-061840-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
140 PM EDT SUN APR 6 1997

* SEVERE THUNDERSTORM WARNING FOR
  CHEBOYGAN COUNTY - NORTH LOWER MICHIGAN
  OTSEGO COUNTY - NORTH CENTRAL LOWER MICHIGAN
  ROSCOMMON COUNTY - NORTH CENTRAL LOWER MICHIGAN

* UNTIL 240 PM EDT
 
* SOME TOWNS AFFECTED
    CHEYBOYGAN
    GAYLORD
    HOUGHTON LAKE

* AT 135 PM EDT RADAR INDICATED A BROKEN LINE OF SEVERE
THUNDERSTORMS FROM CHEYBOYGAN TO GAYLORD TO HOUGHTON LAKE.
MOVING NORTHEAST AT 65 MPH.

* THE STORMS WILL BE AT A ROGERS CITY TO WEST BRANCH LINE BY 105 PM
EDT.

SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS ALONG
WITH DESTRUCTIVE HAIL. WHEN A SEVERE THUNDERSTORM APPROACHES...
MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME.

JAH/BH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 1:26 PM EDT	Severe Thunderstorm Warning	APX	Crawford, Missaukee, Roscommon	49 min
Apr 6, 1:40 PM EDT	Severe Thunderstorm Warning	APX	Cheboygan, Otsego	60 min
Apr 6, 1:44 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Charlevoix, Kalkaska	61 min
Apr 6, 1:44 PM EDT	Severe Thunderstorm Warning	APX	Missaukee	61 min
Apr 6, 1:44 PM EDT	Severe Thunderstorm Warning	APX	Emmet	61 min
Apr 6, 2:39 PM EDT	Severe Thunderstorm Warning	APX	Alpena, Montmorency	46 min
Apr 6, 2:44 PM EDT	Severe Thunderstorm Warning	APX	Oscoda	31 min
Apr 6, 2:48 PM EDT	Severe Thunderstorm Warning	APX	Presque Isle	32 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1997 Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.