Alert archive / Michigan / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 49, NWS Gaylord, MI

July 29, 2002Kalkaska County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 29, 2002, 8:55 AM EDT for Kalkaska County, Michigan. It was in force for 50 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: Jul 29, 2002, 8:55 AM EDT (12:55 UTC)
Expired: Jul 29, 2002, 9:45 AM EDT
In force: 50 min
Issued by: NWS Gaylord, MI
Area: Counties, with a storm outline in the text

County Kalkaska County, MI

The radar

The NCL Michigan radar (KAPX), 40 km from the middle of the area, began a volume at 12:57 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
Jul 29, 8:58 AM EDT	Thunderstorm Wind 50 E	Kalkaska, MI	Several 10 to 15 inch diameter trees downed.

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 nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 0.9 hours before the alert went out and 215 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: 1559 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

831 
WUUS53 KAPX 291255
SVRAPN
MIC079-291345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
855 AM EDT MON JUL 29 2002

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KALKASKA COUNTY IN NORTHWEST LOWER MICHIGAN

* UNTIL 945 AM EDT

* AT 852 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM 7 MILES SOUTHEAST OF KALKASKA...MOVING 
  NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL REACH...
  DARRAGH AROUND 900 AM 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 4451 8516 4460 8528 4485 8499 4485 8486
          4464 8486 4451 8506

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 9:10 AM EDT	Severe Thunderstorm Warning	APX	Crawford, Otsego	50 min
Jul 29, 10:00 AM EDT	Special Marine Warning	APX		90 min
Jul 29, 10:00 AM EDT	Special Marine Warning	APX		90 min
Jul 29, 4:18 PM EDT	Special Marine Warning	APX		27 min

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; radar from the NEXRAD Level II archive.