A line of strong to severe thunderstorms developed during the overnight hours across Wisconsin and Illinois and moved east across Lake Michigan, reaching the western parts of lower Michigan close to sunrise. Wind damage was reported as the line came onshore.
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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 line of strong to severe thunderstorms developed during the overnight hours across Wisconsin and Illinois and moved east across Lake Michigan, reaching the western parts of lower Michigan close to sunrise. Wind damage was reported as the line came onshore.
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 Feb 24, 6:45 AM EST, 47 minutes earlier.
Area Forecast Discussion...CORRECTED National Weather Service Northern Indiana 645 AM EST Fri Feb 24 2017 .SYNOPSIS... Issued at 420 AM EST Fri Feb 24 2017 It will remain unseasonable warm today. Severe weather remains a possibility from mid to late afternoon into the evening hours as storms develop ahead of a cold front moving through the area. Highs today will be in the middle to upper 60s and even lower 70s possible in northwest Ohio into east central Indiana. Temperatures will then plummet back to seasonable levels late tonight and continue through the weekend along with a chance for snow showers. && .SHORT TERM...(Today and Tonight) Issued at 420 AM EST Fri Feb 24 2017 Difficult forecast wrt thunderstorm chances/coverage/severity today. At present scattered showers and a few/isolated weak storms along/north of warm frontal boundary. Cold Lake Erie marine layer continues to drive westward into far nern IN and undercut elevated mixed layer. Suspect scattered showers/storms to continue to slowly lift northward and weaken as capped prefrontal warm sector finally begins to overtake marine influence beyond 12 UTC. Then afford a lull in precip chances as remain largely capped until mid to late afternoon with culmination of strong eml 8.5-9 c/km with modest low level moisture pooled as only mid to upper 50s dewpoints expected. Will likely have to wait for strong forced frontal ascent which lags upstream until about 21-22 UTC...once the surface frontal wave now into northeast MO reaches southern Lake Michigan/extreme sw MI. Scattered convection develops ahead of southward trailing cold front amid strong 50 to 60 kts deep layer shear across western cwa initially and likely merging into linear segments/squall line with time and eastward progression. Leading edge of increasingly strong mid level height rises and divergent upper jet region to allow longevity/sustenance until east/southeast cwa exit around 03-04 UTC. Low wet bulb zero for potential large amounts of small hailstones associated with updraft cores. But loading/melt/evaporative cooling amid already strong mid level winds to present with heightened/primarily isold- sct damaging wind risk, especially across eastern half of cwa in latter part of event. Initial storms however may present with supercellular aspects and low tornado risk across far northern cwa in closer proximity to triple point/frontal boundary...especially if aforementioned Lake Erie marine layer proves difficult to expunge. && .LONG TERM...(Saturday through Thursday) Issued at 420 AM EST Fri Feb 24 2017 Continued with similar rapid transition to snow potential late tonight/early Saturday. Otherwise little change to blended approach with another simialar/weaker tracked system with best rain chances about Tue/Tue night. This system appears bounded in time by much weaker/clipper systems before and afterwards and nudged downward the sometimes overzealous blended pops. && .AVIATION...(For the 12Z TAFS through 12Z Saturday Morning) Issued at 640 AM EST Thu Feb 23 2017 Improved conditons ahead this afternoons convection as warm sector continues to deepen/move northward. Similar timing with respect to thunderstorms with greater potential for strong/potentially severe/greater than 50 kt gust...subsevere for terminal forecasts at this time given isold-sct nature. Changeover to snow showers with lowest conditions invof KSBN late in the forecast period. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...Murphy SHORT TERM...Murphy LONG TERM...Murphy AVIATION...Murphy 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 537 AM EST Fri Feb 24 2017 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-251045- La Porte-St. Joseph IN-Elkhart-Lagrange-Steuben-Noble-De Kalb-Starke- Pulaski-Marshall-Fulton IN-Kosciusko-Whitley-Allen IN-White-Cass IN- Miami-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- 537 AM EST Fri Feb 24 2017 /437 AM CST Fri Feb 24 2017/ This hazardous weather outlook is for portions of southwest Michigan...northern Indiana and northwest Ohio. .DAY ONE...Today and Tonight Severe storms are possible this afternoon and evening with damaging winds the main threat. Hail to one inch in diameter and short-lived tornadoes are also possible. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will be needed this afternoon and evening. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx LMZ043-046-251045- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 537 AM EST Fri Feb 24 2017 This hazardous weather outlook is for portions of The Nearshore Waters of Southeastern Lake Michigan. .DAY ONE...Today and Tonight Strong to severe storms with gusty winds are expected this afternoon. High winds and waves will cause hazardous conditions for small craft tonight. .DAYS TWO THROUGH SEVEN...Saturday through Thursday High winds and waves will cause hazardous conditions for small craft Saturday through Sunday morning. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx
The Northern Indiana radar (KIWX), 93 km away, was scanning. The volume nearest the first event began at 12:29 UTC.
3 thunderstorm wind. Local standard time, as filed.
Emergency management officials reported a eight inch diameter tree blown down into phone lines.
A large tree, greater than a foot in diameter, fell across a local road.
Emergency management officials reported large tree limbs down across a local roadway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2017Every state in 2017This day in weather historyWarnings in Michigan, February 2017
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: 681474, 681475, 681476.