Numerous showers and thunderstorms developed head of a cold front. Localized rainfall amounts of 2 to 3 inches produced minor flooding in a portion of Gladwin 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 APX wrote it up.
Numerous showers and thunderstorms developed head of a cold front. Localized rainfall amounts of 2 to 3 inches produced minor flooding in a portion of Gladwin County. Isolated wind damage occurred in Alpena 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 Gaylord, MI wrote its last area forecast discussion before the first event at Aug 10, 2:33 PM EST, 2 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service Gaylord MI 333 PM EDT Mon Aug 10 2020 .NEAR TERM...(Through Tuesday) Issued at 333 PM EDT Mon Aug 10 2020 ...Severe storms possible this evening...then quiet thru the week... High Impact Weather Potential...Slight risk of severe storms thru this evening for much of Northern Lower Michigan. Any storms that develop may produce damaging winds...large hail and heavy rainfall. Pattern Synopsis/Forecast...Upstream cold front now extends from Central Lake Superior thru Central Wisconsin and Iowa into the Central Plains this afternoon. Large destructive bow echo continues to march thru Iowa into NW Illinois...with additional severe storms to the NE of this signature impacting locations along the Illinois/Wisconsin border. Spotty strong/marginally severe storms continue to impact the eastern half of Upper Michigan. Closer to home...storms are beginning to develop across NE Lower Michigan as MUCAPES near 4000 J/kg and LI's of -10. Certainly the lake breeze boundaries are helping to focus convective development as well. Persistent low clouds over much of our CWA are gradually developing breaks...which will certainly help with further destabilization during the remainder of the afternoon and evening as the cold front sweeps thru the region. Potential limitation to convective development across our CWA could be the large/robust area of severe convection well to our SW maintaining focus and moisture to our south. However...surface dwpts in our CWA are in the 70s everywhere...so we still have plenty of available moisture. Appears we may have to wait for better focus/synoptic support along and ahead of the cold front for more widespread and stronger thunderstorm development within our CWA...which should happen over the next several hours before sunset. Slight chance of severe storms...including damaging winds and large hail...certainly looks possible given effective bulk shear strengthening to 30 to 35 kts just ahead of the front. Have made some adjustments to POPs thru the night...especially in during the evening based on latest expectations of coverage and timing of developing storms. Chances of storms will come to an end by late evening...with some shower activity lingering into the overnight hours. Clouds will steadily decrease from NW to SE very early Tuesday morning...with mainly sunny skies and dry wx expected for Tuesday. Airmass behind the front will be a bit cooler and decidedly less humid. Low temps tonight will cool mainly into the mid 50s to around 60 degrees. High temps Tuesday afternoon will warm into the upper 70s and lower 80s...certainly still warm but definitely less humid. && .SHORT TERM...(Tuesday night through Thursday) Issued at 333 PM EDT Mon Aug 10 2020 ...Above Normal Temperatures... High Impact Weather...None is expected. Forecast Concerns...None at the moment. Models are in excellent agreement with increased ridging aloft and high pressure at the surface. This is expected to lead to clear to partly cloudy skies and very warm temperatures. Highs in the mid and upper 80s and lows mainly in the 50s (a few upper 40s Tuesday night in low lying spots of northern lower). && .LONG TERM...(Thursday night through Monday) Issued at 333 PM EDT Mon Aug 10 2020 ...More Very Warm Temperatures then Cooler... High Impact Weather...None is expected at this time. Upper level ridging remains the dominant feature through the end of the week. This feature should continue to lead to very warm temperatures and rain free conditions. Things become a bit murkier after that with extended models varying on the details of a possible trough and associated cooler air which will likely affect the region at some point this weekend into early next week. Will run with the blend's low chance pops starting Friday night (removed pops from Friday) and continue pops into Sunday (when we probably have our best chance for rain). Hopefully future model runs will come into better agreement on the details and timing. Temperatures are expected to remain above normal through Sunday with cooler readings likely next Monday. && .AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 121 PM EDT Mon Aug 10 2020 A cold front will sweep thru Michigan late this afternoon and this evening...producing scattered showers and thunderstorms along and ahead of it. A few of these storms could be strong to severe... producing damaging winds and large hail. Torrential rain is also possible. Remaining MVFR cigs across portions of our area will continue to lift into VFR cigs this afternoon. Conditions within any thunderstorms that develop will drop to MVFR and possibly IFR. Surface winds will remain from the SW at around 10 kts into early evening...before shifting to the W/NW later this evening and overnight in the wake of the cold front. && .MARINE... Issued at 333 PM EDT Mon Aug 10 2020 Winds and waves will remain below SCA criteria through mid week despite the passage of a cold front this evening. Chances of showers and storms will increase along and ahead of this front late this afternoon and this evening. A few of these storms could become severe...with damaging winds and large hail the primary threats. Winds and waves may be higher in and around any thunderstorms that develop. Precip chances will come to an end overnight behind the cold front...with dry wx expected thru most of the rest of the week. && .APX WATCHES/WARNINGS/ADVISORIES... MI...NONE. LH...NONE. LM...NONE. LS...NONE. && NEAR TERM...MR SHORT TERM...AS LONG TERM...AS AVIATION...MR MARINE...MR
Hazardous Weather Outlook National Weather Service Gaylord MI 339 PM EDT Mon Aug 10 2020 MIZ016>018-020>036-041-042-086>088-095>099-110800- Emmet-Cheboygan-Presque Isle-Leelanau-Antrim-Otsego-Montmorency- Alpena-Benzie-Grand Traverse-Kalkaska-Crawford-Oscoda-Alcona- Manistee-Wexford-Missaukee-Roscommon-Ogemaw-Iosco-Gladwin-Arenac- Western Chippewa-Central Chippewa-Southeast Chippewa- Western Mackinac-Eastern Mackinac- Mackinac Island/Bois Blanc Island- Beaver Island and surrounding islands-Charlevoix- 339 PM EDT Mon Aug 10 2020 This hazardous weather outlook is for Eastern Upper Michigan and Northern Lower Michigan. .DAY ONE...Late this afternoon and tonight. Scattered to numerous thunderstorms are expected late this afternoon and this evening across all of northern Michigan. There is a slight risk of severe storms, the primary threats being damaging winds, and to a lesser extent, large hail. Locally heavy rainfall is possible. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. There is a chance for thunderstorms on Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. && For more information visit http://weather.gov/gaylord. LHZ345>349-LMZ323-341-342-344>346-LSZ321-322-110800- Straits of Mackinac within 5 nm of Mackinac Bridge including Mackinac Island-St Ignace to False Detour Channel- 5NM East of Mackinac Bridge to Presque Isle Light MI including Bois Blanc Island- Presque Isle Light to Sturgeon Pt MI Including Thunder Bay National Marine Sanctuary-Sturgeon Pt to Alabaster MI- Grand Traverse Bay south of a line Grand Traverse Light to Norwood MI-Seul Choix Point to 5NM West of Mackinac Bridge- Norwood MI to 5NM West of Mackinac Bridge including Little Traverse Bay-Sleeping Bear Point to Grand Traverse Light MI- Point Betsie to Sleeping Bear Point MI- Manistee to Point Betsie MI- Whitefish Bay (U.S. Portion)/Whitefish Point to Point Iroquois MI- St. Marys River Point Iroquois to E. Potagannissing Bay- 339 PM EDT Mon Aug 10 2020 This hazardous weather outlook is for the northern Michigan nearshore waters of Lake Huron, Lake Michigan and Lake Superior. .DAY ONE...Late this afternoon and tonight. Scattered to numerous thunderstorms are expected late this afternoon and this evening across all of northern Michigan. There is a sl
The NCL Michigan radar (KAPX), 85 km away, was scanning. The volume nearest the first event began at 21:57 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Trees were downed onto power lines near Leer and Olsen Roads.
M-30 near Indian Lake Drive was partially submerged and closed by high water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2020Every state in 2020This day in weather historyWarnings in Michigan, August 2020
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: 918894, 918893.