Alert archive / Michigan / Special Marine Warnings in 2021
Special Marine Warning 21, NWS Gaylord, MI
NWS Gaylord, MI issued this special marine warning at Jul 27, 2021, 1:13 AM EDT. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2021, 1:13 AM EDT (05:13 UTC)
- Expired
- Jul 27, 2021, 1:45 AM EDT
- In force
- 32 min
- Issued by
- NWS Gaylord, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 34.0 mph
The radar
The NCL Michigan radar (KAPX), 128 km from the middle of the area, began a volume at 05:15 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 nearest sounding before it
Alpena, MI (KAPX), launched 00:00Z, 5.2 hours before the alert went out and 239 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.
- Mixed-layer CAPE
- 36 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 2075 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
657
WHUS53 KAPX 270513
SMWAPX
LMZ341-362-270545-
/O.NEW.KAPX.MA.W.0021.210727T0513Z-210727T0545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Gaylord MI
113 AM EDT Tue Jul 27 2021
The National Weather Service in Gaylord has issued a
* Special Marine Warning for...
Lake Michigan South of a line from Seul Choix Point to the Mackinac
Bridge and North of a line from Charlevoix MI to South Fox Island
5NM offshore...
Seul Choix Point to 5NM West of Mackinac Bridge...
* Until 145 AM EDT.
* At 113 AM EDT, a severe thunderstorm was located near Epoufette, or
16 nm northeast of Point Patterson, moving east at 40 knots.
HAZARD...Wind gusts 34 knots or greater and large hail.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves. Large hail could result in
structural damage.
* Locations impacted include...
Point Aux Chenes, Epoufette, Naubinway and Brevort.
LAT...LON 4605 8498 4595 8484 4582 8485 4596 8555
4613 8552 4615 8541
TIME...MOT...LOC 0513Z 276DEG 40KT 4608 8528
HAIL...>.75IN
WIND...>34KTS
$$
JSL1 follow-up statement
782
FZUS73 KAPX 270525
MWSAPX
Marine Weather Statement
National Weather Service Gaylord MI
125 AM EDT Tue Jul 27 2021
LMZ341-362-270545-
/O.CON.KAPX.MA.W.0021.000000T0000Z-210727T0545Z/
125 AM EDT Tue Jul 27 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 145 AM EDT...
For the following areas...
Lake Michigan South of a line from Seul Choix Point to the Mackinac
Bridge and North of a line from Charlevoix MI to South Fox Island 5NM
offshore...
Seul Choix Point to 5NM West of Mackinac Bridge...
At 125 AM EDT, a severe thunderstorm was located over Epoufette, or
15 nm northwest of Point Aux Chenes, moving east at 35 knots.
HAZARD...Wind gusts 34 knots or greater and large hail.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves. Large hail could result in
structural damage.
Locations impacted include...
Point Aux Chenes, Epoufette, Naubinway and Brevort.
LAT...LON 4605 8498 4595 8484 4582 8485 4596 8555
4613 8552 4615 8541
TIME...MOT...LOC 0525Z 282DEG 37KT 4604 8524
HAIL...>.75IN
WIND...>34KTS
$$
JSLThe office that day
Everything else NWS Gaylord, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 12:43 AM EDT | Special Weather Statement | APX | Mackinac | 47 min |
| Jul 27, 12:50 AM EDT | Severe Thunderstorm Warning | APX | Mackinac | 40 min |
| Jul 27, 2:17 AM EDT | Special Marine Warning | APX | 88 min | |
| Jul 27, 2:59 AM EDT | Special Weather Statement | APX | Cheboygan | 61 min |
Nearby
Special Marine Warnings in Michigan, 2021Every special marine 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.