Alert archive / Michigan / Special Weather Statements in 2021
Special Weather Statement, NWS Detroit, MI
NWS Detroit, MI issued this special weather statement at Jul 20, 2021, 3:35 PM EDT for Sanilac County, Michigan. It was in force for 55 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 20, 2021, 3:35 PM EDT (19:35 UTC)
- Expired
- Jul 20, 2021, 4:30 PM EDT
- In force
- 55 min
- Issued by
- NWS Detroit, MI
County Sanilac County, MI
The radar
The Detroit radar (KDTX), 113 km from the middle of the area, began a volume at 19:35 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
Detroit, MI (KDTX), launched 12:00Z, 7.6 hours before the alert went out and 109 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
- 151 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 1105 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Detroit, MI wrote its last area forecast discussion before this special weather statement went out at Jul 20, 3:30 PM EDT, 5 minutes earlier.
Area forecast discussion, Jul 20, 3:30 PM EDT, 5 minutes before
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</html>Hazardous weather outlook, Jul 20, 8:11 AM EDT, 7 hours 24 minutes before
Hazardous Weather Outlook...CORRECTED National Weather Service Detroit/Pontiac MI 811 AM EDT Tue Jul 20 2021 MIZ049-054-055-062-063-070-210815- Huron-Tuscola-Sanilac-Lapeer-St. Clair-Macomb- 811 AM EDT Tue Jul 20 2021 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...Today and Tonight Isolated severe storms are possible this afternoon and evening. Scattered to numerous thunderstorms will develop across the thumb between 2 PM and 4 PM and will move south to Lake St Clair by 6 or 7 PM. The strongest storms will be capable of producing wind gusts to 60 MPH and hail to one inch in diameter. Individual storms will move west to the east at 40 MPH while the main cluster of storms and/or new storm development slowly tracks from north to south. A strong cold front will be responsible for the thunderstorms. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Periodic chances for thunderstorms exist from Friday through Sunday. .SPOTTER INFORMATION STATEMENT... Dispatchers...please notify your emergency managers immediately. Spotter activation may be needed this afternoon and evening. MIZ047-048-053-060-061-068-069-075-076-082-083-210815- Midland-Bay-Saginaw-Shiawassee-Genesee-Livingston-Oakland-Washtenaw- Wayne-Lenawee-Monroe- 811 AM EDT Tue Jul 20 2021 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...Today and Tonight Scattered thunderstorms are expected this afternoon and evening. Some storms may approach severe limits. The better chances for thunderstorms will be along the Interstate 75 corridor and points east. The strongest storms will be capable of producing wind gusts of 45 to 60 MPH and hail to one half inch in diameter. Storm motion will be from west to east at 40 MPH. A strong cold front will be responsible for the thunderstorms. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Periodic chances for thunderstorms exist from Friday through Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today or tonight. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-210815- Lake St Clair- Michigan Waters of Lake Erie from Detroit River to North Cape MI- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore- Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI- Port Sanilac to Port Huron MI- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 811 AM EDT Tue Jul 20 2021 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...Today and Tonight Strong thunderstorms are possible this afternoon and evening, mainly across Lake Huron south of Sturgeon Point and down to Lake St Clair. Thunderstorms are expected to develop over central and southern Lake Huron this afternoon and move south into Lake St Clair and western Lake Erie this evening. The strongest storms will be capable of producing wind gusts in excess of 40 knots and hail in excess of a half inch. Individual storm motion will be from west to east at 35 knots while storm clusters and new storm development will be oriented from north to south. Small craft advisories are in effect for the Lake Huron nearshore waters from this afternoon through tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Small craft advisories will remain in effect into Wednesday afternoon for the southern Lake Huron nearshore waters. Periodic chances for thunderstorms exist from Friday through Sunday. .SPOTTER INFORMATION STATEMENT... Dispatchers...please notify your emergency managers immediately. Spotter activation may be needed this afternoon and evening. You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. SC
In the hours before
Special weather statement, Jul 20, 2:29 PM EDT, 1 hour 6 minutes before
Special Weather Statement
National Weather Service Detroit/Pontiac MI
229 PM EDT Tue Jul 20 2021
MIZ049-202000-
Huron-
229 PM EDT Tue Jul 20 2021
...A STRONG THUNDERSTORM WILL AFFECT NORTHERN HURON COUNTY...
At 229 PM EDT, a strong thunderstorm was located 8 miles northwest of
Port Austin, moving southeast at 25 mph.
Winds in excess of 40 mph and pea size hail are possible with this
storm.
This storm will be near...
Port Austin around 245 PM EDT.
Kinde around 300 PM EDT.
Port Hope around 320 PM EDT.
Other locations impacted by this storm include Pinnebog, Port
Crescent State Park, Grindstone City, Redman, Filion and Huron City.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4400 8270 4386 8261 4387 8338 4392 8344
4394 8342 4395 8334 4399 8329 4403 8310
4407 8305 4407 8286
TIME...MOT...LOC 1829Z 310DEG 23KT 4414 8310
AMSpecial weather statement, Jul 20, 3:35 PM EDT, 0 minutes before
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</html>The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 9:54 PM EDT | Small Craft Advisory | DTX | 42 hr | |
| Jul 19, 9:59 PM EDT | Beach Hazards Statement | DTX | Bay, Huron, Saint Clair, Sanilac | 26 hr |
| Jul 20, 2:19 PM EDT | Special Marine Warning | DTX | 73 min | |
| Jul 20, 2:29 PM EDT | Special Weather Statement | DTX | Huron | 91 min |
| Jul 20, 2:57 PM EDT | Severe Thunderstorm Warning | DTX | Huron | 51 min |
| Jul 20, 3:06 PM EDT | Special Marine Warning | DTX | 84 min | |
| Jul 20, 4:27 PM EDT | Special Weather Statement | DTX | Lapeer | 93 min |
| Jul 20, 4:57 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 63 min |
| Jul 20, 5:59 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb, Oakland, Saint Clair | 61 min |
| Jul 20, 6:43 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Oakland | 62 min |
| Jul 20, 6:59 PM EDT | Special Weather Statement | DTX | Livingston, Oakland | 61 min |
| Jul 20, 7:28 PM EDT | Severe Thunderstorm Warning | DTX | Oakland, Wayne | 62 min |
| Jul 20, 7:53 PM EDT | Special Weather Statement | DTX | Washtenaw | 97 min |
Nearby
Special Weather Statements in Michigan, 2021Every special weather statement 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.