Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Gaylord, MI

July 5, 2021Alcona County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 5, 2021, 8:34 PM EDT for Alcona County, Michigan. It was in force for 26 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 5, 2021, 8:34 PM EDT (00:34 UTC)
Expired: Jul 5, 2021, 9:00 PM EDT
In force: 26 min
Issued by: NWS Gaylord, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Alcona County, MI

The radar

The NCL Michigan radar (KAPX), 113 km from the middle of the area, began a volume at 00:36 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
Jul 5, 8:35 PM EDT	TSTM WND DMG	2 Sw Black River, MI	AT LEAST FIVE 12-18 SIZE TREES ARE DOWN ON THE PROPERTY DUE TO STRONG WINDS. MINOR DAMAGE TO ONE BUILDING AS ONE TREE FELL AGAINST IT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 0.6 hours before the alert went out and 77 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: 1353 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

As transmitted.

199 
WUUS53 KAPX 060034
SVRAPX
MIC001-060100-
/O.NEW.KAPX.SV.W.0015.210706T0034Z-210706T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
834 PM EDT Mon Jul 5 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Northeastern Alcona County in northern Michigan...

* Until 900 PM EDT.

* At 834 PM EDT, a severe thunderstorm was located over Black River,
  or 9 miles southeast of Ossineke, moving east at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Black River around 840 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4466 8324 4466 8325 4471 8347 4486 8344
      4486 8333 4488 8331 4489 8336 4489 8326
      4487 8327 4485 8324 4475 8325 4471 8322
TIME...MOT...LOC 0034Z 279DEG 17KT 4479 8335 

HAIL...1.00IN
WIND...60MPH
 
$$

MLR

1 follow-up statement

639 
WWUS53 KAPX 060057
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
857 PM EDT Mon Jul 5 2021

MIC001-060106-
/O.EXP.KAPX.SV.W.0015.000000T0000Z-210706T0100Z/
Alcona MI-
857 PM EDT Mon Jul 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ALCONA COUNTY
WILL EXPIRE AT 900 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Gaylord.

LAT...LON 4466 8324 4466 8325 4471 8347 4486 8344
      4486 8333 4488 8331 4489 8336 4489 8326
      4487 8327 4485 8324 4475 8325 4471 8322
TIME...MOT...LOC 0056Z 279DEG 17KT 4477 8321 

$$

MLR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:19 PM EDT	Special Weather Statement	APX	Alcona, Alpena, Crawford, Iosco, Kalkaska, Ogemaw and 2 more	86 min
Jul 6, 3:43 AM EDT	Small Craft Advisory	APX		18 hr

Nearby

Severe Thunderstorm Warnings in Michigan, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.