A cold front moved through the area, interacting with MLCAPE approached 1500 J/KG and DCAPE near 1000 J/KG. Pockets of effective shear greater than 30 knots was present.
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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 cold front moved through the area, interacting with MLCAPE approached 1500 J/KG and DCAPE near 1000 J/KG. Pockets of effective shear greater than 30 knots was present. This allowed thunderstorms to develop and produce a few reports of damage across the area.
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 May 9, 1:39 PM CST, 2 hours 51 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 339 PM EDT Wed May 9 2018 .SYNOPSIS... Issued at 336 PM EDT Wed May 9 2018 Another round of storms is expected this evening. A few could be severe but any that do become severe will be fairly isolated. Near normal temperatures and clearing skies expected on Thursday. Several rounds of rain are possible over the weekend into early next week. && .SHORT TERM...(This Evening through Thursday) Issued at 336 PM EDT Wed May 9 2018 Upper trough over Wisconsin expected to continue to track east- northeast as we go into the evening hours. Still expecting a secondary round of convection between 00Z and 06Z as the trough axis and associated surface front nears the area. There is some question as to how organized any early convective development this afternoon will be due to deep layer shear holding around 20kt. Deep layer shear increases this evening as the second round moves into the western zones and mid-level lapse rates hold around 7 C/km. Curved forecast hodographs show the potential for some of the storms to become organized prior to becoming more linear as the front pushes through later tonight. An isolated severe storm can't be ruled out, but CAM trends throughout the day have hinted that the threat would be more localized than widespread. With that being said, storm that develop and become organized, damaging wind gusts are the primary threat but an isolated severe hail is not out of the question. Front sweeps through the area late tonight into early Thursday morning to clear POPs from west to east. The affect of the cooler post-frontal airmass on Thursday's highs will be a few degrees below climo. Cloudy skies will slowly clear throughout the day. && .LONG TERM...(Thursday Night through Wednesday) Issued at 336 PM EDT Wed May 9 2018 A secondary front is expected to drop out of Canada during the day on Thursday, but isn't expected to push into the northern zones until late Thursday night/early Friday morning. The front should then stall over northern Indiana as the flow aloft transitions to a more zonal orientation. The zonal flow aloft should persist over the Great Lakes Region well into early next week as riding dominates the Northern Great Plains. A series of perturbation within the upper flow will bring ample opportunities for convection across the area over the weekend and into next week. Given the stationary front and parallel flow aloft, training storms are likely. Also, PWATs are forecast to reach into the 1.25" to 1.5" range over this time period. The result is the potential for flooding or flash flooding. A possible mitigating factor would be the front being pushed further south than shown in medium range model due to cold pool interactions. If this comes to pass then, the duration of POPs would be significantly shorter than what is currently forecast. && .AVIATION...(For the 18Z TAFS through 18Z Thursday Afternoon) Issued at 115 PM EDT Wed May 9 2018 VFR at the onset of the forecast winds out of the south near 20 kts with gusts to 25 kts. Rain and thunderstorms move in over both terminals from west to east starting around 00z. Conditions during this time will deteriorate down to MVFR. Precip clears out by 06z bringing flight conditions back up to VFR. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...Small Craft Advisory until 7 PM EDT this evening for LMZ043-046. && SYNOPSIS...CM SHORT TERM...CM LONG TERM...CM AVIATION...Heidelberger 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 541 AM EDT Wed May 9 2018 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-101000- 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- 541 AM EDT Wed May 9 2018 /441 AM CDT Wed May 9 2018/ This hazardous weather outlook is for portions of southwest Michigan...northern Indiana and northwest Ohio. .DAY ONE...Today and Tonight Thunderstorms are likely late this afternoon and evening. Isolated severe storms with a primary threat for damaging winds is expected especially west of Interstate 69. A secondary risk for marginally severe hail is possible over northwest Indiana into southwest Michigan late this afternoon. A few wind gusts to around 30 mph are possible this afternoon in Indiana. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Additional chances of thunderstorms are expected at times Friday through Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed for parts of the area late this afternoon and evening. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx LMZ043-046-101000- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 541 AM EDT Wed May 9 2018 This hazardous weather outlook is for portions of The Nearshore Waters of Southeastern Lake Michigan. .DAY ONE...Today and Tonight Thunderstorms are likely this afternoon. A few may produce wind gusts in excess of 35 knots, along with locally higher waves. Outside of thunderstorms, gusty south winds to 25 knots will lead to hazardous conditions for small craft. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Additional chances of thunderstorms are expected at times Friday through Sunday. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx
Special Weather Statement National Weather Service Northern Indiana 559 PM EDT WED MAY 9 2018 INZ003-004-MIZ077-092230- La Porte-St. Joseph-Berrien- 559 PM EDT WED MAY 9 2018 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN ST. JOSEPH... NORTHERN LA PORTE AND SOUTHEASTERN BERRIEN COUNTIES... At 558 PM EDT/458 PM CDT/, a strong thunderstorm was located over La Porte, moving northeast at 55 mph. Winds in excess of 40 mph are possible with this storm. Locations impacted include... South Bend, La Porte, Buchanan, New Carlisle, Roseland, Kingsbury, Byron, Hudson Lake, Fish Lake, Chain-o-lakes, Rolling Prarie, Crumstown, Stillwell, Pinola, Lydick and Union Mills. This includes Interstate 80 in Indiana between mile markers 42 and 77. LAT...LON 4147 8676 4163 8688 4184 8632 4168 8622 TIME...MOT...LOC 2158Z 240DEG 49KT 4160 8672 MF
Special Weather Statement
National Weather Service Northern Indiana
519 PM CDT WED MAY 9 2018
INZ003-012-092245-
La Porte-Starke-
519 PM CDT WED MAY 9 2018
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL STARKE AND SOUTHERN LA
PORTE COUNTIES...
At 519 PM CDT, a strong thunderstorm was located over La Crosse, or
near Dunns Bridge, moving northeast at 40 mph.
Wind gusts up to 50 mph and dime size hail are possible with this
storm.
Locations impacted include...
Knox, Kingsford Heights, Hamlet, La Crosse, Koontz Lake, Hanna,
Thomaston, Lomax, South Center, English Lake, Salem Heights, Brems,
Tracy, Toto, San Pierre and Grovertown.
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 4138 8693 4156 8652 4152 8650 4152 8652
4151 8653 4143 8652 4143 8647 4133 8647
4118 8693
TIME...MOT...LOC 2219Z 243DEG 33KT 4130 8689
NWSThe Northern Indiana radar (KIWX), 83 km away, was scanning. The volume nearest the first event began at 22:28 UTC.
8 thunderstorm wind. Local standard time, as filed.
Emergency management officials reported barn buildings were knocked over and suffered roof collapse.
Emergency management officials reported a large tree was blown down onto a house near the intersection of County road 200 N and 100 W.
Emergency management officials reported a large tree was down on County Road 600 N.
Several tree limbs were blown down.
Law enforcement officials reported a tree fell through a house.
Emergency management officials reported damage to a house roof.
Emergency management officials reported damage to the roof of a home.
Emergency management officials reported damage to the roof of a home.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2018Every state in 2018This day in weather historyWarnings in Indiana, May 2018
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: 757507, 757508, 757509, 757510, 757511, 757512, 757513, 757514.