A thunderstorm brought down trees in southern Monroe County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DTX wrote it up.
A thunderstorm brought down trees in southern Monroe County.
The local office's own words before the first event, 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 the first event at Aug 13, 1:39 PM EST, 2 hours 12 minutes earlier.
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 239 PM EDT Fri Aug 13 2021 .DISCUSSION... The cold front is slowly dropping across SE MI this afternoon, currently residing in between I-69 and M-59. Dewpoints south of the front are still around 70 which has allowed modest instability to develop. SPC mesoanalysis shows 1000+ J/kg of ML/SBCAPE which is matched in current CAM runs along with modest mid-level lapse rates a bit over 6 C/km. Forcing/convergence is not particularly strong along the front however it has been enough for isolated shower development so far this afternoon. Given the available instability, isolated to widely scattered showers and thunderstorms are possible through the rest of the afternoon and into the evening. While an isolated stronger wind gust can't be ruled out, any storms that do develop are expected to stay below severe intensity. Scattered rain chances come to an end this evening (by around 00Z) as the front finally clears the area. Much drier air follows the front with upstream dewpoints over northern lower already down in the low 50s/upper 40s helping to clear skies out for tonight. Lows will fall into the 50s for most areas. Dry, comfortable weather pattern develops late this evening as a broad Canadian high settles over the Great Lakes region. High pressure holds over the region through the weekend and into the day Monday. A thermal trough simultaneously moves across the state this weekend due to upper leveling troughing over the northern lakes/Ontario. 850mb temps fall to 7-9C Saturday before recovering slightly Sunday by reaching 10-11C. With mostly sunny skies, highs will still reach to mid to upper 70s Saturday and upper 70s near 80 Sunday (with very little humidity). However this setup also brings cooler nights as lows drop into the mid 50s each night. Pattern change becomes possible Tuesday as weak upper trough develops across the central part of the country allowing weak shortwaves to lift into the area. This weak trough in concert with sprawling Bermuda high pressure sets up southerly flow across the Mississippi Valley allowing Gulf moisture to work north, eventually reaching the Great Lakes by mid week. The remnants of TD Fred will be something to watch next week as it's forecast to track into the Tennessee Valley early Wednesday. && .MARINE... Northwesterly flow to continue through tomorrow following the frontal passage earlier this morning. Winds remain light, at or below 15 kts, and diminish further through the weekend as high pressure expands into the region. Northwesterly flow becomes southwesterly on Sunday as the high pressure center tracks overhead. Dry conditions persist through Monday, before rain chances return on Tuesday as a warm front lifts through the region. && .PREV DISCUSSION... Issued at 731 AM EDT Fri Aug 13 2021 AVIATION... The southern edge or periphery of upper level jet will expand to the south today increasing broad convergence over Southeast Michigan. The increase in larger scale convergence will then help sharpen or augment a low level cold frontal boundary that is already slipping southward across the Great Lakes. The combination of the front with residual instability and moisture will bring the potential for an isolated shower and thunderstorm to the Detroit terminals primarily in the 19-21Z time window. Maintained a VCSH group this afternoon for the Detroit terminals that was introduced earlier in an amendment. For DTW...The potential exists for an isolated shower or thunderstorms this afternoon with brief MVFR. DTW THRESHOLD PROBABILITIES... * High for ceiling at or below 5000 ft today. * Low for thunderstorms this afternoon. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. Lake Huron...NONE. Lake St Clair...NONE. Michigan waters of Lake Erie...NONE. && DISCUSSION...KDK MARINE.......MV AVIATION.....CB You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 420 AM EDT Fri Aug 13 2021 MIZ047>049-053>055-060>063-068>070-075-076-082-083-140900- Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer- St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe- 420 AM EDT Fri Aug 13 2021 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...Today and Tonight There is a chance of thunderstorm this morning into the early afternoon as a cold front drops through the area. These storms are not expected to be severe although an isolated gust to 60 mph cannot be ruled out. Urban/low lying flooding are also possible as storms will be affecting locations that have received several inches of rain in recent days. Storm motion will be west to east at 40 mph. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today. LCZ460-LEZ444-LHZ421-422-441>443-462>464-140900- Lake St Clair- Michigan Waters of Lake Erie from Detroit River to North Cape MI- 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- 420 AM EDT Fri Aug 13 2021 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...Today and Tonight There is a chance of thunderstorm this morning into the early afternoon as a cold front drops through the area. These storms are not expected to be severe although an isolated gust to 50 knots cannot be ruled out. Storm motion will be west to east at 35 knots. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today. LHZ361>363-140900- 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- 420 AM EDT Fri Aug 13 2021 This hazardous weather outlook is for portions of Lake Huron. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. DRK
Special Weather Statement
National Weather Service Detroit/Pontiac MI
329 PM EDT Fri Aug 13 2021
MIZ076-082-083-132045-
Lenawee MI-Monroe MI-Wayne MI-
329 PM EDT Fri Aug 13 2021
...Strong thunderstorms will impact portions of Monroe, south central
Wayne and southern Lenawee Counties through 445 PM EDT...
At 328 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles east of Wyandotte to near Dundee to
near Morenci. Movement was east at 25 mph.
HAZARD...Winds in excess of 30 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Strong thunderstorms will be near...
Maybee around 335 PM EDT.
Carleton around 355 PM EDT.
Flat Rock and Blissfield around 405 PM EDT.
Trenton, Grosse Ile, Deerfield and Ottawa Lake around 415 PM EDT.
Petersburg around 420 PM EDT.
Temperance around 430 PM EDT.
Monroe and Luna Pier around 445 PM EDT.
Other locations impacted by these storms include Newport, Seneca,
Gibraltar, Estral Beach, Ogden Center, Toledo Beach, Erie, South
Rockwood, Woodland Beach and Stony Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4174 8436 4217 8313 4212 8312 4205 8315
4199 8313 4190 8325 4190 8330 4181 8337
4173 8352 4172 8384
TIME...MOT...LOC 1928Z 256DEG 27KT 4219 8303 4200 8362 4179 8423
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH
SCThe Detroit radar (KDTX), 106 km away, was scanning. The volume nearest the first event began at 20:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees and power lines reported down near Lambertville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2021Every state in 2021This day in weather historyWarnings in Michigan, August 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 979978.