A lone thunderstorm developed near the shoreline of Berrien county and tracked southeast, being fed by an increased theta-e feed. The storm began collapsing in the Niles area, producing isolated wind damage.
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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 IWX wrote it up.
A lone thunderstorm developed near the shoreline of Berrien county and tracked southeast, being fed by an increased theta-e feed. The storm began collapsing in the Niles area, producing isolated wind damage.
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 Northern Indiana wrote its last area forecast discussion before the first event at Aug 25, 3:14 AM EST, 1 hour 38 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 414 AM EDT Tue Aug 25 2020 .SYNOPSIS... Issued at 410 AM EDT Tue Aug 25 2020 An area of showers and thunderstorms across the western Great Lakes will drop southeast across southern Lower Michigan, portions of far northern Indiana, and possibly into portions of northwest Ohio this morning. A few storms may produce some gusty winds. There is a low chance of more showers and thunderstorms redeveloping this afternoon, especially along and east of Interstate 69. If thunderstorms are able to develop this afternoon, an isolated strong to severe thunderstorm with gusty winds would be possible. Otherwise, hot conditions will continue through Thursday with peak afternoon heat indices in the mid and upper 90s across most locations. && .SHORT TERM...(Today and Tonight) Issued at 410 AM EDT Tue Aug 25 2020 Hot conditions with heat indices in the mid and upper 90s along with convective potential through this afternoon will continue to be the main items of interest for the short term. A westerly low level jet across western Wisconsin/northern Illinois impinging on pre-existing low level trough has resulted in expanding coverage of convection early this morning from northwest Wisconsin to southeast Wisconsin. This weak westerly low level jet appears to mark leading edge of some slightly steeper mid level lapse rates as sampled by 00Z KDVN RAOB last evening with plenty of elevated instability. Late last evening propagation with this convection was indicating more of a southeast tendency, with recent trend over past several hours of a more south-southeast propagation, likely showing some preference to upwind development given maximum elevated instability across northern Illinois. Cell trends have been weakening as they crossed into northern Illinois over the past few hours however, owing in part to some relatively large low level dew point depressions and slightly more CIN across these locations. With a mainly westerly low level jet orientation, this southward upwind development along convective outflows dropping out of southern Wisconsin also is not optimal. Should see an eventual southeast shift to this convection across eastern Wisconsin through daybreak with maximum coverage expected across far northern Indiana/southern Lower MIchigan and possibly into extreme northwest Ohio if convection can hold together. Generally expecting subsevere storms this morning as upscale/cold pool growth has been difficult to come by, but pockets of stronger wind gusts in excess of 40 mph cannot be ruled out toward daybreak before an expected weakening trend. This morning convection/outflows coupled with southward building and eventual stalling synoptic surface trough will need to be monitored for potential redevelopment this afternoon. Unfortunately still a good deal of uncertainty as to how this afternoon will evolve and will depend on how thermodynamic environment is altered with any morning convection. This could yield some CIN for surface based parcels to the north/northeast of outflow-reinforced synoptic troughing. Decent low level theta-e gradient will be in place today, but main question will be extent of mid/upper level forcing by this afternoon as convectively enhanced short wave may be exiting the area to the southeast during the mid/late afternoon. A highly conditional isolated severe threat exists (mainly east of I-69) depending on extent of instability recovery, with isolated strong/severe wind gusts as the potential main threats. The other big story today (and into Thursday) will be heat/heat indices. The same uncertainties with the convection will provide uncertainty with heat index forecast today, with lowest confidence in areas to be more likely influenced by morning convection/outflows across northeast half of the area. Highest confidence for heat indices in the 95 to 100 degree range will be across southwest portions of the forecast area and will likely highlight this area in an SPS this morning. For tonight, did hold onto a slight chance of showers and storms across the east given little movement in upper pattern/low level theta-e gradient with some indications of another ridge-riding upper wave later tonight possibly activating this boundary. && .LONG TERM...(Wednesday through Monday) Issued at 410 AM EDT Tue Aug 25 2020 Heat concerns should become more widespread again into Wednesday as series of northern stream waves across the northern Plains dampen upper ridge axis and allows it to shift slightly eastward. Still counting on this to take better convective chances into central Ohio by later Wednesday afternoon. Widespread 95 to 100 degree peak afternoon heat indices look likely with afternoon highs in the low to mid 90s on Wednesday. This heat should linger into Thursday, but some increase in shower/storm chances possible again that could impact temps as more substantial northern stream disturbances impact western Great Lakes. Synoptic boundary will likely be displaced north of the area however and will limit pops to slight chance/low chance for this period. Best chances of rain this forecast period still look to be Thursday night through Friday night as remnants of tropical system slowly lift across the lower Ohio River Valley and as synoptic trough edges southward with progression of more amplified upper level short wave across the US/Canadian border by Friday night. Cooler and less humid conditions will be in store for the weekend as this trough and cold front clear the area. An active eastern Pacific pattern should result in renewed precip chances by late weekend or early next week but a good deal of spread exists among medium range guidance in regards to the details for these later periods. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday Night) Issued at 125 AM EDT Tue Aug 25 2020 For the time being, VFR TAFs will be maintained with upstream convective trends still being monitored for impacts to KSBN around 12Z Tue and then this afternoon/eve mainly for KFWA. Storms have been slowly expanding across W/S Wisconsin, drifting SE with time. However, several cells have trended more SSE or even S at times, potentially placing KSBN in a better position to see at least some convection (albeit it likely weakening). Trends could easily keep things west of the site so have opted to keep KSBN clear of any convection and monitor trends. Weak boundary will drift into the area on Tuesday and could provide a focus for storms, mainly at KFWA this afternoon. Remnants of upstream convection could also play a role in development. Again will defer addition of convection for KFWA until later forecasts given low confidence on impacts to the site. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...Marsili SHORT TERM...Marsili LONG TERM...Marsili AVIATION...Fisher Visit us at www.weather.gov/iwx Follow us on Facebook...Twitter...and YouTube at: www.facebook.com/NWSNorthernIndiana www.twitter.com/nwsiwx www.youtube.com/NWSNorthernIndiana
Hazardous Weather Outlook National Weather Service Northern Indiana 439 AM EDT Tue Aug 25 2020 INZ012>015-020-022-023-260845- Starke-Pulaski-Marshall-Fulton IN-White-Cass IN-Miami- 439 AM EDT Tue Aug 25 2020 /339 AM CDT Tue Aug 25 2020/ This Hazardous Weather Outlook is for northern Indiana. .DAY ONE...Today and tonight. Heat indices will rise into the 95 to 100 degree range today. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Peak afternoon heat indices between 95 and 100 are expected Wednesday and Thursday afternoons. There are chances of thunderstorms from Thursday through Friday night, with the best chances Friday and Friday night. A few strong storms are possible during this period. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ003>009-016>018-024>027-032>034-MIZ077>081-OHZ001-002-004-005-015- 016-024-025-260845- La Porte-St. Joseph IN-Elkhart-Lagrange-Steuben-Noble-De Kalb- Kosciusko-Whitley-Allen IN-Wabash-Huntington-Wells-Adams-Grant- Blackford-Jay-Berrien-Cass MI-St. Joseph MI-Branch-Hillsdale- Williams-Fulton OH-Defiance-Henry-Paulding-Putnam-Van Wert-Allen OH- 439 AM EDT Tue Aug 25 2020 /339 AM CDT Tue Aug 25 2020/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan and northwest Ohio. .DAY ONE...Today and tonight. An area of showers and thunderstorms is expected to move across southern Lower Michigan, far northern Indiana, and possibly into portions of northwest Ohio later this morning. Widespread severe weather is not expected, but isolated strong wind gusts in excess of 40 mph are possible with a few of the storms. There is a low chance of more showers and thunderstorms developing this afternoon, mainly along and east of Interstate 69. If thunderstorms are able to develop, isolated strong to severe thunderstorms would be possible with isolated damaging wind gusts as the potential main threat. There is a slight chance of thunderstorms tonight. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Peak afternoon heat indices between 95 and 100 are expected Wednesday and Thursday afternoons. There are lingering slight chances of thunderstorms east of Interstate 69 on Wednesday. There are chances of thunderstorms from Thursday through Friday night, with the best chances Friday and Friday night. A few strong storms are possible during this period. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible this afternoon. LMZ043-046-260845- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 439 AM EDT Tue Aug 25 2020 This Hazardous Weather Outlook is for the nearshore waters of southeastern Lake Michigan. .DAY ONE...Today and tonight. Scattered thunderstorms are expected to move across southern Lake Michigan this morning. A few of these storms may produce wind gusts to around 30 knots and locally higher waves. There is a slight chance of a thunderstorm tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There are more chances of showers and thunderstorms Thursday through Friday night. Hazardous conditions for small craft are possible on Saturday.
Special Weather Statement National Weather Service Northern Indiana 521 AM EDT Tue Aug 25 2020 INZ012>018-020-022>027-032>034-OHZ024-025-252145- Starke-Pulaski-Marshall-Fulton IN-Kosciusko-Whitley-Allen IN- White-Cass IN-Miami-Wabash-Huntington-Wells-Adams-Grant-Blackford- Jay-Van Wert-Allen OH- Including the cities of Knox, North Judson, Bass Lake, Winamac, Francesville, Medaryville, Plymouth, Bremen, Culver, Rochester, Akron, Warsaw, Winona Lake, Syracuse, Mentone, Columbia City, Tri-Lakes, South Whitley, Fort Wayne, New Haven, Monticello, Monon, Brookston, Logansport, Royal Center, Peru, Grissom AFB, Mexico, Wabash, North Manchester, Huntington, Roanoke, Bluffton, Ossian, Decatur, Berne, Marion, Gas City, Upland, Hartford City, Montpelier, Portland, Dunkirk, Van Wert, Ohio City, Lima, and Spencerville 521 AM EDT Tue Aug 25 2020 /421 AM CDT Tue Aug 25 2020/ ...Heat Index Values in the Mid to Upper 90s Today... Peak afternoon heat indices are expected to range from the mid 90s to around 100 today. Heat indices are expected to reach the 95 to 100 degree range once again on Wednesday and Thursday. Exact heat indices today will be dependent on the coverage of any afternoon showers and thunderstorms, with the best chance for these showers and storms this afternoon across northeast Indiana into northwest Ohio. Practice heat safety this week. Limit outdoor activities if possible, particularly anything strenuous. If you plan to be outside, take frequent breaks in an air conditioned location and drink a lot of water. If driving, when you park don't forget to look before you lock: never leave children or pets unattended in a vehicle. Each year, dozens of children and untold numbers of pets left in vehicles die from overheating.
The Northern Indiana radar (KIWX), 70 km away, was scanning. The volume nearest the first event began at 09:50 UTC.
1 thunderstorm wind. Local standard time, as filed.
Local media reported through social media of several large, healthy branches down with one rotten tree severely damaged.
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: 904980.