Severe thunderstorms producing wind damage occurred across Livingston, Wayne, and Monroe counties.
Every event with a place to put it. Tap one for its entry below.
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.
Severe thunderstorms producing wind damage occurred across Livingston, Wayne, and Monroe counties.
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 Jun 26, 8:13 PM EST, 2 hours 5 minutes earlier.
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 913 PM EDT Fri Jun 26 2020 .UPDATE... Severe Thunderstorm Watch 307 is in effect for the maturing MCS/QLCS moving into SW Lower Mi at press time. The system organized rapidly during peak heating and with the added support of parent MCV, and is now feeding back into the strength of the MCV itself while growing further upscale. The result is a distinct mesolow showing up in surface pressure analysis with a notable increase in SW surface wind across Indiana. This response helps draw a narrow wedge of higher instability north of the IN/OH border to provide some downstream fuel for the convection. MLCAPE around 2000 J/kg with effective bulk shear around 40 kts supports higher end MCS maintenance downstream through the Watch area. The linear mode of the system clearly presents damaging wind has the primary hazard while some tornado potential remains in the vicinity of the warm front and/or near the apex of more pronounced bows/lewps. The northern boundary of the watch area covers a reasonable northward extent of severe weather potential based on the expected northward progress of better instability. Continued evolution of the MCV and cold pool also could lead to some forward propagation and a slightly farther south track should the convection outrun the northward progress of instability. At least some increase in forward speed also makes it possible for the storms to exit SE Michigan a couple hours sooner the the 5 AM watch expiration. && .PREV DISCUSSION... Issued at 708 PM EDT Fri Jun 26 2020 AVIATION... Thunderstorm trends tonight remain the focus of aviation weather during the evening into early overnight. This has the leading edge of activity that crossed southern Lake Michigan into SW Lower reaching the terminal corridor from PTK to DTW 01-02Z. There should also be enough instability moving in from the south to continue supporting showers or weaker storms as they arrive while questions remain on storm intensity from a severe weather perspective later in the evening. The low pressure circulation aloft also provides forcing for showers/storms of a more elevated nature reaching FNT with mainly just showers toward MBS. This brings a wide range of flight conditions across the area including IFR restriction within the stronger storms. The pattern exits eastward after about 07Z leaving a rain cooled warm sector in place with higher dewpoint supporting MVFR stratus through the morning. These clouds follow a standard diurnal lifting trend associated with boundary layer heating/mixing while a weak cold front slides through the region during the afternoon. A stray shower or thunderstorm is possible but the greatest coverage is expected south of the Ohio border heading into Saturday evening. For DTW... Initial showers and weaker storms arrive 01-02Z followed by additional rounds of stronger storms expected through about 07Z. There remains potential for a damaging wind component to stronger storms mid to late evening with improved prospects for the line to settle south and east of the terminal after 07Z. Storms are followed by MVFR ceiling and visibility in fog through sunrise. DTW THRESHOLD PROBABILITIES... * High for ceiling below 5000 feet tonight and Saturday morning. * Moderate for thunderstorms this evening and overnight. PREV DISCUSSION... Issued at 321 PM EDT Fri Jun 26 2020 DISCUSSION... As discussed earlier, initial wave of elevated convection released from the avenue of isentropic forcing over northern Illinois and weakened substantially. Currently the region of residual rainfall and isolated new development is sliding ESE along the stateline. Return of deeper moisture and instability is anchored to the narrow warm advection region of the approaching mid-level circulation over far southwest Wisconsin. Returns on the KGRR radar outline where the elevated moist layer transport is ongoing. Meanwhile, the wedge of better near-surface convective quality air over Illinois will attempt to ooze into the southern quarter of the Lower Peninsula over the next 6 hours or so - supporting some fuel for the expectant thunderstorm activity developing upstream. Best timing for organized thunderstorms will be in the 8pm to 2am window - while some additional elevated development will occur prior, as the attempted warm sector surge occurs. Coherent redevelopment has delayed somewhat back across the region of strongest dynamical forcing - partially owing to a delay in the build-up of instability along the Mississippi River due to a stubborn cloud field. As such, there continues to be substantial uncertainty to the overall nature of convective evolution this evening. Short- range CAM ensemble solutions are offering a wide variety of outcomes - including failure to grow upscale. Anticipate the strong dynamic forcing will eventually overcome some of the current obstacles. However, this far downstream will still pose a challenge to maintain widespread severe outcomes given the declining instability quality and time of day. Expectations are for embedded bowing segments capable of producing wind damage. There is still a level of caution regarding any vigor to convection that may exist along the MCV track. If boundary-layer rooting can take place there will be a very favorable near surface shear profile along that corridor to support updraft rotation. Current indications are the near surface boundary will attempt to linger near the Ohio border through early Saturday afternoon - enough to support clouds and the continued chance for shower development across Metro Detroit and points south. If the convection tonight is more efficient at displacing the synoptic frontal zone than currently projected, the forecast will land on the drier side through the day. Farther north, a few isolated showers may also develop as differential advection provides a marginally unstable profile during the afternoon. For nearly all of next week, the large scale pattern will remain rather stagnant. Expect maintained ridging over the central CONUS with another closed low separating from the mean flow over New England and settling south into the mid-Atlantic region. While some clouds may leak in from the east with the feature. The weather will be dry and typical temperature-wise with highs in the mid to upper 80s and lows om the 60s. MARINE... Low pressure has developed in southern Canada and is currently moving across north-central Ontario. The warm front has moved slower than initially thought and looks to stall over the lower Peninsula and the southernmost portion of Lake Huron. This hang up will help to keep the majority of storms over the southern Great Lakes (southern Lake Huron and south). The cold front is also delayed from original forecast likely moving across the central Great Lakes during the day Saturday. Northwest flow develops post frontal passage but remains on the lighter side with gusts around or below 15kts. HYDROLOGY... Showers and thunderstorms are expected to overspread southeast Michigan during the evening and overnight hours and potentially linger into Saturday across far southern portions of the area. The west to east movement may result in multiple rounds of showers and thunderstorms, some of which may be strong to severe thunderstorms. The increased moisture - Precipitable Water values approaching 2 inches - will bring the chance for heavy rain. Total rainfall amounts of 1-2" will be possible along and south of I-69 with decreasing amounts in the 0.25-75" towards the Tri-Cities and Thumb. Widespread significant flooding is not expected at this time. However, localized flooding of poor drainage locations in urban areas and rises along local rivers and streams will be possible. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. Lake Huron...NONE. Lake St Clair...NONE. Michigan waters of Lake Erie...NONE. && UPDATE.......BT AVIATION.....BT DISCUSSION...Mann MARINE.......KDK HYDROLOGY....Mann You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 830 PM EDT Fri Jun 26 2020 MIZ047>049-053>055-060>063-068>070-075-076-082-083-271945- Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer- St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe- 830 PM EDT Fri Jun 26 2020 This hazardous weather outlook is for southeast Michigan. .DAY ONE...Tonight Severe Thunderstorm Watch 307 is in effect generally along and south of the M-59 corridor until 5 AM. There is an Enhanced Risk of severe weather south of I-96 and west of US-23 with a Slight Risk for the rest of southeast Michigan. Severe thunderstorms with bowing segments capable of producing damaging winds of 60 to 65 mph will be the primary threat. Isolated hail up to 1 inch and a tornado will also be possible as storms move west to east at 45 mph. The main time window for severe storms is between 10 PM and 3 AM. Multiple rounds of heavy rain could also bring rainfall totals of 1 to 2 inches in localized areas along and south of the I-69 corridor. This would lead to possible urban and small stream flooding concerns. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Dispatchers, please notify your emergency manager immediately. Spotter activation has occurred. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-271945- 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- 830 PM EDT Fri Jun 26 2020 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...Tonight Severe Thunderstorm Watch 307 is in effect generally south of Port Huron through the Monroe county portion of Lake Erie until 5 AM. Damaging wind around 50 knots is the main hazard as storms track east at 45 knots. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of thunderstorms across western Lake Erie on Saturday. .SPOTTER INFORMATION STATEMENT... Spotter activation has occurred. You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. TF/BT
Special Weather Statement
National Weather Service Detroit/Pontiac MI
934 PM EDT Fri Jun 26 2020
MIZ068-075-270245-
Livingston-Washtenaw-
934 PM EDT Fri Jun 26 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LIVINGSTON AND
WASHTENAW COUNTIES...
At 933 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Mason to near Grass Lake. Movement
was east at 40 mph.
Winds in excess of 30 mph are possible with these storms.
These storms will be near...
Chelsea around 945 PM EDT.
Dexter around 955 PM EDT.
Ann Arbor and Fowlerville around 1000 PM EDT.
Howell and Whitmore Lake around 1010 PM EDT.
Ypsilanti, Cohoctah, Dixboro and Oak Grove around 1015 PM EDT.
Salem around 1020 PM EDT.
Other locations impacted by these storms include Pittsfield Township,
Whittaker, Plainfield, Hudson Mills Metropark, Island Lake State
Recreation Area, Bridgewater, Delhi Mills, Pleasant Lake, Barton
Hills and Pinckney State Recreation Area.
If outdoors, seek shelter inside a building. Torrential rainfall is
also occurring with these storms, and may cause localized flooding.
Do not drive your vehicle through flooded roadways.
A Severe Thunderstorm Watch remains in effect until 500 AM EDT for
southeastern Michigan.
LAT...LON 4278 8369 4243 8366 4243 8355 4209 8354
4207 8413 4242 8413 4277 8416
TIME...MOT...LOC 0133Z 255DEG 34KT 4265 8444 4225 8416
KKSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
1034 PM EDT Fri Jun 26 2020
MIZ068-270345-
Livingston-
1034 PM EDT Fri Jun 26 2020
...A STRONG THUNDERSTORM WILL AFFECT LIVINGSTON COUNTY...
At 1033 PM EDT, a strong thunderstorm was located over Pinckney,
moving east at 20 mph.
Winds in excess of 30 mph and pea size hail are possible with this
storm.
This storm will be near...
Hamburg around 1050 PM EDT.
Brighton and Whitmore Lake around 1100 PM EDT.
Hartland around 1110 PM EDT.
South Lyon around 1115 PM EDT.
Other locations impacted by this storm include Parkers Corners,
Lakeland, Plainfield, Island Lake State Recreation Area, Chilson,
Unadilla, Pinckney State Recreation Area, Conway Township, Hell and
Tyrone Township.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
A Severe Thunderstorm Watch remains in effect until 500 AM EDT for
southeastern Michigan.
LAT...LON 4278 8369 4243 8366 4243 8367 4242 8414
4277 8416
TIME...MOT...LOC 0233Z 249DEG 19KT 4249 8395
KKSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
1050 PM EDT Fri Jun 26 2020
MIZ069-076-270400-
Oakland-Wayne-
1050 PM EDT Fri Jun 26 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WAYNE AND OAKLAND
COUNTIES...
At 1049 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Milford to Livonia to near
Wyandotte. Movement was northeast at 35 mph.
Winds in excess of 30 mph are possible with these storms.
These storms will be near...
Milford around 1055 PM EDT.
Downtown Detroit and West Bloomfield around 1105 PM EDT.
Southfield, Detroit, Royal Oak, Birmingham and Belle Isle around
1110 PM EDT.
Detroit Zoo around 1115 PM EDT.
Holly, Grosse Pointe and Clarkston around 1120 PM EDT.
Warren, Troy and Pontiac around 1125 PM EDT.
Ortonville around 1130 PM EDT.
Oxford and Rochester around 1135 PM EDT.
Other locations impacted by these storms include Franklin, Keego
Harbor, Melvindale, Gibraltar, Waterford, Holly State Recreation
Area, Commerce, Auburn Hills, Lake Angelus and Harper Woods.
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 500 AM EDT for
southeastern Michigan.
LAT...LON 4236 8288 4232 8306 4229 8309 4224 8313
4212 8313 4202 8318 4209 8329 4209 8354
4243 8355 4243 8366 4287 8369 4288 8354
4289 8310 4245 8308 4245 8283
TIME...MOT...LOC 0249Z 207DEG 28KT 4255 8364 4242 8338 4225 8320
KKThe Detroit radar (KDTX), 48 km away, was scanning. The volume nearest the first event began at 03:17 UTC.
4 thunderstorm wind. Local standard time, as filed.
Trees were reported blown down, with several blocking roads.
Trees were reported down.
A tree was reported down on US-23.
Several trees and wires reported down.
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, June 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: 901009, 901015, 901011, 901013.