Alert archive / Illinois / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 102, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 5, 2017, 7:17 PM CDT for 4 counties in Illinois. It was in force for 12 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 5, 2017, 7:17 PM CDT (00:17 UTC)
- Expired
- Jul 5, 2017, 7:29 PM CDT
- In force
- 12 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 17 km from the middle of the area, began a volume at 00:17 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 189 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 476 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 5, 6:54 PM CDT, 23 minutes earlier.
Area forecast discussion, Jul 5, 6:54 PM CDT, 23 minutes before
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</html>Hazardous weather outlook, Jul 5, 3:26 PM CDT, 3 hours 51 minutes before
Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 326 PM CDT Wed Jul 5 2017 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 062030- Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane- DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston- Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton- 326 PM CDT Wed Jul 5 2017 /426 PM EDT Wed Jul 5 2017/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...Tonight. WEATHER HAZARDS EXPECTED: Limited Thunderstorm Risk. DISCUSSION: Isolated to scattered thunderstorms are possible south and west of Chicago into early evening. Slow storm movement may lead to ponding of water on roadways and isolated flooding. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Thursday... Limited Flooding Risk. Elevated Severe Thunderstorm Risk. Friday through Tuesday... Limited Thunderstorm Risk. DISCUSSION: There is a chance for some isolated to scattered thunderstorms later Thursday afternoon but the better chance will be later Thursday evening into early Thursday night. There is a chance for some strong to severe storms, especially across north central Illinois, with the better chances further north. Strong winds and large hail would be the main hazards. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated this evening but reports of heavy rainfall are appreciated. GENERAL STORM MOTION OF THE DAY: Slow moving storms, generally moving northeast at 10 mph or less. && LMZ740>745-062030- Winthrop Harbor to Wilmette Harbor- Wilmette Harbor to Northerly Island- Northerly Island to Calumet Harbor-Calumet Harbor to Gary- Gary to Burns Harbor-Burns Harbor to Michigan City- 326 PM CDT Wed Jul 5 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Thursday and Friday... Limited Thunderstorm Risk. Sunday through Tuesday... Limited Thunderstorm Risk. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-062030- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and north of a line from Charlevoix MI to South Fox Island 5 NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to Mid Lake- Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 326 PM CDT Wed Jul 5 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...Tonight. Scattered thunderstorms are possible across central and northern portions of Lake Michigan. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. There will be periodic low chances for thunderstorms across portions of Lake Michigan through Tuesday. && MDB Visit us at http://weather.gov/chicago Follow us on Facebook, Twitter, and Youtube at: www.facebook.com/nwschicago www.twitter.com/nwschicago www.youtube.com/nwschicago
In the hours before
Local storm report, Jul 5, 4:30 PM CDT, 2 hours 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
430 PM CDT WED JUL 05 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0423 PM HEAVY RAIN MACHESNEY PARK 42.36N 89.04W
07/05/2017 M1.50 INCH WINNEBAGO IL BROADCAST MEDIA
1.50 INCHES OF RAIN REPORTED IN MACHESNEY PARK.
&&Special weather statement, Jul 5, 4:47 PM CDT, 2 hours 30 minutes before
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</html>Special weather statement, Jul 5, 4:53 PM CDT, 2 hours 24 minutes before
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</html>Local storm report, Jul 5, 5:02 PM CDT, 2 hours 15 minutes before
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</html>Special weather statement, Jul 5, 5:22 PM CDT, 1 hour 55 minutes before
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</html>Special weather statement, Jul 5, 6:35 PM CDT, 42 minutes before
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</html>Nearby
Severe Thunderstorm Warnings in Illinois, 2017Every severe thunderstorm warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.