A thunderstorm moving through Saginaw Bay produced a wind gust to 35 knots.
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The episode as NWS DTX wrote it up.
A thunderstorm moving through Saginaw Bay produced a wind gust to 35 knots.
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 Apr 13, 6:56 PM EST, 3 hours 37 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 756 PM EDT Mon Apr 13 2026 .KEY MESSAGES... - Stretch of warm conditions throughout the work week with daytime temperatures in the 70s each day for most locations. - Scattered to numerous showers and thunderstorms develop tonight. Potential exists for isolated severe storms capable of producing wind gusts to 60 mph and large hail. Locally heavy rainfall also possible. - An active pattern will maintain periodic chances for showers and thunderstorms Tuesday through Thursday. Each episode brings the possibility for locally heavy rainfall. - There is a Slight Risk for severe thunderstorms Tuesday night, mainly between 8 pm and 2 am. Storms will be capable of producing wind gusts to 60 mph, large hail and isolated tornadoes. && .AVIATION... Low level thetae advection along a diffuse warm front combined with right entrance region jet dynamics has resulted in lift/thunderstorm activity across far southern portions of Lower Michigan this evening. Movement of convective activity with general mean flow should allow activity to move out by/around 03z. Wind gusts to 35 knots will be possible with convective activity and included in the TEMPO. Deeper thetae advection associated with shortwave impacting Wisconsin will expand eastward with time this evening. Latest thought is that thunderstorm activity will break out/redevelop at KMBS and KFNT after 05z this evening, then a line of weakening shower and thunderstorms catching up/pushing across all of Southeast Michigan including the Detroit sites between 10-14z. Low confidence exists on exact timing late tonight/Tuesday morning. Much of Tuesday is quiet with shower/thunderstorm activity likely holding off until after 03z Wednesday. DTW/D21 Convection...Showers and thundestorms with wind gusts to 35 knots likely at the start of the period between 00-02z. Thunderstorm activity will then be possible between 10-14z Tuesday. .DTW THRESHOLD PROBABILITIES... * High for ceilings aob 5000 feet tonight and Tuesday. * Moderate for thunderstorms this evening and early Tuesday morning. && .PREV DISCUSSION... Issued at 252 PM EDT Mon Apr 13 2026 DISCUSSION... Higher magnitude warmth within breezy southwest wind marking conditions late afternoon. High temperatures again arriving a solid 15 to 20 degrees above normal - mid to upper 70s most locations. General mid level stability will hold into the early evening hours as shortwave upper ridging propagates through, ensuring dry conditions persist into the early evening hours. Attention then turns to two seperate areas of focus for convective development and expansion tonight. Remnant convective cluster evident on water vapor and radar lifting northeast into northern IL now forecast by an increasing number of hi res solutions to maintain some degree of integrity as it ejects across southern lake MI/northern IN. This will occur with the backdrop of another period of nocturnal warm/moist air advection as 850 mb flow strengthens within southwest flow across the warm sector. Forecast now highlights an increasing potential for convective development/expansion within the 00z-06z window as associated ascent works through. Any late evening activity likely to be slightly elevated as nocturnal boundary layer cooling affords a standard stable near surface layer. With that, isolated deeper updrafts plausible given the steepness of lapse rates above the stable layer, with adequate bulk shear for greater organization. This maintains potential for some instances of larger hail and gusty winds, in addition to brief heavy rainfall. Additional convective organization and expansion expected this evening along/north of a frontal boundary extending across central WI. This activity likely to consolidate with time as it spills east/southeast into the early morning hours, but mixed signal yet on both trajectory and scale. Steep mid level lapse rates will maintain a risk for hail with any healthier cores. Latest SPC Day 1 outlook continues to highlight all of Southeast Michigan within a Marginal Risk for severe weather for tonight. The resident airmass remains virtually unchanged heading into Tuesday. Some degree of stability may exist for a portion of the daylight period, pending the coverage and pace of exit of overnight activity. Solid diurnal destabilization likely by afternoon, at least across the south, where MLCAPE pushes 1500+ as temps again climb well into the 70s and dewpoint hovers in the lower 60s. Some evidence of a weak frontal zone or differential heating boundary bisecting the area. This could offer a lower coverage of convection for peak heating. Otherwise, still no evidence of more meaningful forced ascent materializing prior to 00z Tuesday evening. Existing mid level southwest flow ripe with minor perturbations and bouts of greater moist isentropic ascent continue to present a favorable, yet challenging background environment to gauge convective potential locally Tuesday night. There remains strong model evidence for convective initation and expansion to occur in the vicinity of the frontal boundary across northern IL/southern WI and western lower MI Tuesday evening. Very supportive environment will exist for the maintenance and possible upscale growth of this activity into portions of southeast Michigan sometime within the 00z to 04z window. While the nocturnal timing brings lessening instability with time near the surface, MuCape projected to exceed 2000 j/kg. Frontal zone now draped across the Saginaw valley and thumb will offer a greater focus across this region. In fact, noteworthy backed/southeast low level flow at the frontal interface gives pause to the possibility for organized updrafts to rotate. A mix of discreet and multicellular clusters will bring the risk of all hazards - strong winds, large hail and isolated tornadoes. All of Southeast Michigan remains with a Slight Risk for severe weather Tuesday night. Some areas of heavy rainfall also a concern given expectation for efficient rates given high end moisture content /PW near 1.3"/. Mild/moist airmass still entrenched Wednesday and Thursday. Outgoing forecast continues to highlight expectation for a high coverage of showers and thunderstorms Wednesday, but some downward revision in precip chances possible as greater focus may again hold to the south and west during the daylight period. Another nocturnal convective response likely Wed night as moisture transport increases along the nose of the low level jet. Periodic chances for additional showers and thunderstorms lasting into Thursday. Dry and continued mild Friday, then rain chances increase again early next weekend. MARINE... Shortwave ridging this afternoon has led to pleasant marine conditions under a modest southwest breeze. Pockets of 25 knot gusts are observed over land, but quickly drop off offshore where profiles are more stable. Attention turns to an upstream cluster of thunderstorms over northern Illinois that will track into southeast Michigan after sunset this evening. These storms will be capable of large hail to an inch, frequent lightning, and isolated gusty winds over 35 knots. This will be the first of several rounds of nocturnal thunderstorms this week as multiple waves of low pressure ripple along a stalled frontal zone. Each round of storms will bring potential for strong to severe storms to the southern half of Lake Huron, Lake St. Clair, and western Lake Erie. The front is forecast to hover around the Saginaw Bay area, with northerly winds emerging north of front and southwest winds for points south. Wind and wave concerns this week will be tied to thunderstorm activity. HYDROLOGY... An active pattern will bring periodic chances for showers and thunderstorms tonight through Thursday. Each episode brings the possibility for locally heavy rainfall, particularly where focused areas of thunderstorms develop. Rainfall amounts in excess of half an inch will be possible for a round of rain tonight. Additional rainfall between one and two inches currently forecast to fall between Tuesday and Thursday. While widespread flooding is not expected, some minor flooding of low lying, poor drainage and urban areas along with rises on area rivers are possible. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...None. Lake Huron...None. Lake St Clair...None. Michigan waters of Lake Erie...None. && AVIATION.....CB DISCUSSION...MR MARINE.......MV HYDROLOGY....MR You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 353 AM EDT Mon Apr 13 2026 MIZ047>049-053>055-060>063-068>070-075-076-082-083-141000- Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer- St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe- 353 AM EDT Mon Apr 13 2026 This hazardous weather outlook is for southeast Michigan. .DAY ONE...Today and Tonight A marginal risk of severe weather exists tonight, with potential for large hail. Storm motion will be northeast around 35 mph. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is a Slight Risk for severe weather Tuesday and Tuesday night with potential for large hail, damaging wind and isolated tornadoes. Storm motion will be east around 45 mph. Periodic chances of thunderstorms continue Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed tonight. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-141000- 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- 353 AM EDT Mon Apr 13 2026 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...Today and Tonight A marginal risk of severe weather exists tonight, with potential for large hail. Storm motion will be northeast around 30 knots. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is a Slight Risk for severe weather Tuesday and Tuesday night with potential for large hail, damaging wind and isolated tornadoes. Storm motion will be east around 40 knots. Periodic chances of thunderstorms continue Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed 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
820 PM EDT Mon Apr 13 2026
MIZ076-140130-
Wayne MI-
820 PM EDT Mon Apr 13 2026
...STRONG THUNDERSTORMS WILL IMPACT WAYNE COUNTY THROUGH 930 PM
EDT...
At 820 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Ann Arbor to Milan to near Dundee.
Movement was east at 40 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Strong thunderstorms will be near...
Canton around 825 PM EDT.
Belleville around 830 PM EDT.
Romulus around 835 PM EDT.
Taylor and Flat Rock around 845 PM EDT.
Dearborn and Trenton around 850 PM EDT.
Wyandotte and Greenfield Village around 855 PM EDT.
Grosse Ile around 900 PM EDT.
Other locations impacted by these storms include Inkster, Brownstown
Township, Melvindale, Gibraltar, New Boston, Sumpter Township, Garden
City, Riverview, Wayne, and Westland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4235 8290 4232 8306 4230 8309 4224 8313
4217 8313 4212 8312 4209 8315 4209 8354
4235 8354 4237 8289
TIME...MOT...LOC 0020Z 267DEG 34KT 4225 8371 4210 8370 4201 8373
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
MVSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
833 PM EDT Mon Apr 13 2026
MIZ069-075-076-140130-
Oakland MI-Washtenaw MI-Wayne MI-
833 PM EDT Mon Apr 13 2026
...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN WAYNE...OAKLAND AND
NORTHEASTERN WASHTENAW COUNTIES THROUGH 930 PM EDT...
At 833 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Howell to near Novi to Romulus. Movement
was east at 30 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Strong thunderstorms will be near...
Livonia, Novi, Milford, and Northville around 840 PM EDT.
Southfield around 845 PM EDT.
West Bloomfield around 850 PM EDT.
Detroit, Royal Oak, and Birmingham around 900 PM EDT.
Troy and Detroit Zoo around 905 PM EDT.
Warren around 910 PM EDT.
Pontiac and Sterling Heights around 915 PM EDT.
Other locations impacted by these storms include Franklin, Keego
Harbor, Waterford, Orchard Lake, Commerce, Lathrup Village, Auburn
Hills, Bingham Farms, Lake Angelus, and Farmington Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4235 8367 4246 8366 4269 8368 4273 8309
4237 8308
TIME...MOT...LOC 0033Z 263DEG 25KT 4256 8391 4249 8355 4221 8337
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
MVSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
911 PM EDT Mon Apr 13 2026
MIZ070-076-140145-
Macomb MI-Wayne MI-
911 PM EDT Mon Apr 13 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN WAYNE AND SOUTHERN
MACOMB COUNTIES THROUGH 945 PM EDT...
At 911 PM EDT, Doppler radar was tracking a strong thunderstorm near
Warren, moving east at 30 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Warren around 915 PM EDT.
St. Clair Shores around 920 PM EDT.
Grosse Pointe around 925 PM EDT.
Other locations impacted by this storm include Roseville, Fraser,
Eastpointe, Northeast Detroit, Harper Woods, Grosse Pointe Shores,
Center Line, Hamtramck, Grosse Pointe Woods, and Grosse Pointe Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4255 8258 4256 8262 4255 8266 4250 8270
4254 8276 4254 8281 4244 8283 4236 8288
4236 8308 4255 8309 4259 8268 4258 8264
4259 8263 4257 8261 4260 8254
TIME...MOT...LOC 0111Z 266DEG 26KT 4245 8307
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
MVSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
926 PM EDT Mon Apr 13 2026
MIZ053-060-140230-
Shiawassee MI-Saginaw MI-
926 PM EDT Mon Apr 13 2026
...A STRONG THUNDERSTORM WILL IMPACT SAGINAW AND NORTHWESTERN
SHIAWASSEE COUNTIES THROUGH 1030 PM EDT...
At 925 PM EDT, Doppler radar was tracking a strong thunderstorm over
Elsie, or 12 miles northwest of Owosso, moving northeast at 40 mph.
HAZARD...Nickel size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
This strong thunderstorm will be near...
Oakley around 935 PM EDT.
Chesaning around 940 PM EDT.
St. Charles around 945 PM EDT.
Other locations impacted by this storm include Brant, Nelson, Swan
Creek, Shiawassee National Wildlife Refuge, Garfield, Fosters,
Hemlock, Fenmore, Burt, and Layton Corners.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4348 8437 4348 8417 4323 8370 4322 8393
4316 8393 4302 8436
TIME...MOT...LOC 0125Z 234DEG 33KT 4312 8435
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH
MVSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
1019 PM EDT Mon Apr 13 2026
MIZ054-140330-
Tuscola MI-
1019 PM EDT Mon Apr 13 2026
...A STRONG THUNDERSTORM WILL IMPACT TUSCOLA COUNTY THROUGH 1130 PM
EDT...
At 1019 PM EDT, Doppler radar was tracking a strong thunderstorm over
Frankenmuth, moving northeast at 30 mph.
HAZARD...Nickel size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
This strong thunderstorm will be near...
Reese around 1025 PM EDT.
Vassar around 1030 PM EDT.
Fairgrove around 1040 PM EDT.
Caro around 1045 PM EDT.
Cass City and Gagetown around 1115 PM EDT.
Other locations impacted by this storm include East Dayton, Deford,
Colling, Tuscola, Wilmot, Colwood, Wisner, Ellington, Gilford, and
Watrousville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4367 8346 4367 8312 4342 8311 4325 8369
4360 8370 4361 8372 4361 8373 4363 8374
4364 8372 4362 8368 4370 8358 4374 8347
TIME...MOT...LOC 0219Z 239DEG 27KT 4337 8374
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH
MVSpecial Weather Statement
National Weather Service Detroit/Pontiac MI
1103 PM EDT Mon Apr 13 2026
MIZ048-140330-
Bay MI-
1103 PM EDT Mon Apr 13 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN BAY COUNTY THROUGH
1130 PM EDT...
At 1103 PM EDT, Doppler radar was tracking a strong thunderstorm over
Bentley, or near Standish, moving northeast at 40 mph.
HAZARD...Nickel size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
Locations impacted include...
Pinconning, Bentley, and Mount Forest.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4391 8404 4391 8391 4392 8390 4392 8387
4380 8389 4375 8395 4381 8417 4400 8416
4400 8405
TIME...MOT...LOC 0303Z 228DEG 36KT 4396 8408
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH
MVThe Detroit radar (KDTX), 138 km away, was scanning. The volume nearest the first event began at 03:35 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Huron in 2026Every state in 2026This day in weather history
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: 1327834.