Alert archive / Illinois / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 124, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 19, 2017, 8:30 PM CDT for DeKalb County, LaSalle County, Lee County, Illinois. It was in force for 30 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 19, 2017, 8:30 PM CDT (01:30 UTC)
- Expired
- Jul 19, 2017, 9:00 PM CDT
- In force
- 30 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties DeKalb County, IL, LaSalle County, IL, Lee County, IL
The radar
The Chicago radar (KLOT), 75 km from the middle of the area, began a volume at 01:31 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 19, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
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 19, 6:48 PM CDT, 1 hour 42 minutes earlier.
Area forecast discussion, Jul 19, 6:48 PM CDT, 1 hour 42 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Jul 19, 3:48 PM CDT, 4 hours 42 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
348 PM CDT Wed Jul 19 2017
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
202100-
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-
348 PM CDT Wed Jul 19 2017 /448 PM EDT Wed Jul 19 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Tonight.
WEATHER HAZARDS EXPECTED:
Elevated Thunderstorm Risk...with an associated:
Limited Tornado Risk.
Elevated Hail Risk...up to nickel size.
Significant Thunderstorm Wind Damage Risk...up to 60 MPH.
Elevated Flooding Risk.
Elevated Excessive Heat Risk.
DISCUSSION:
Isolated to widely scattered thunderstorms have formed and are
mainly producing heavy rain. The strongest storms may produce
small hail or gusty winds. A second, larger complex of
thunderstorms is forecast to move southeast into far northern
Illinois overnight. It is still uncertain if the storms will move
through much of the area or just pass near the Illinois and
Wisconsin state line. There is potential to have severe winds with
this complex of storms, as well as periods of very heavy rainfall
that could bring localized flooding.
In addition...flooding is expected along portions of the Fox
and Des Plaines Rivers.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday...
Limited Flooding Risk.
Elevated Severe Thunderstorm Risk.
Elevated Excessive Heat Risk.
Friday...
Elevated Flooding Risk.
Elevated Severe Thunderstorm Risk.
Elevated Excessive Heat Risk.
Saturday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
Sunday...
Limited Thunderstorm Risk.
High Swim Risk.
Tuesday...
Limited Thunderstorm Risk.
DISCUSSION:
An active and humid weather pattern will continue into the
weekend. This will include periodic thunderstorm chances with
the potential for heavy rain that could result in flooding, and
possibly a severe thunderstorm threat. The humid air mass also
may lead to heat index readings in excess of 100 degrees, most
favored south of Interstate 80 Thursday through Saturday.
In addition, flooding will continue along portions of the Fox and
Des Plaines Rivers.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed tonight.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast at 10 to 15 MPH.
&&
LMZ740>745-202100-
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-
348 PM CDT Wed Jul 19 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.
Limited Thunderstorm Risk.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday and Friday...
Elevated Thunderstorm Risk.
Saturday...
Limited Thunderstorm Risk.
Sunday...
Limited Thunderstorm Risk.
Hazardous Conditions for Small Craft are likely.
Monday...
Hazardous Conditions for Small Craft are likely.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-202100-
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-
348 PM CDT Wed Jul 19 2017
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...Tonight.
Thunderstorms are likely tonight. Some of these overnight storms
may produce wind gusts in excess of 50 knots, especially for the
southern portions of the lake.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
There are periodic thunderstorm chances through Sunday.
&&
JEE
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/nwschicagoThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 7:21 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 54 min |
| Jul 19, 7:54 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Lee, McHenry, Ogle, Winnebago | 51 min |
| Jul 19, 8:05 PM CDT | Special Marine Warning | LOT | 25 min | |
| Jul 19, 8:16 PM CDT | Tornado Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 29 min |
| Jul 19, 8:24 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 19, 8:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 4 more | 56 min |
| Jul 19, 9:08 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Grundy, Kendall, Will | 67 min |
| Jul 19, 9:55 PM CDT | Special Weather Statement | LOT | Kankakee | 35 min |
| Jul 19, 10:26 PM CDT | Special Marine Warning | LOT | 64 min | |
| Jul 19, 10:37 PM CDT | Special Weather Statement | LOT | Ford, Iroquois | 53 min |
| Jul 19, 10:49 PM CDT | Special Weather Statement | LOT | Boone, DeKalb, Kane, Lake, McHenry, Winnebago | 56 min |
| Jul 20, 3:28 AM CDT | Special Weather Statement | LOT | Boone, Ogle, Winnebago | 47 min |
| Jul 20, 3:48 AM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 42 min |
| Jul 20, 4:21 AM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Kane, Ogle | 39 min |
| Jul 20, 4:38 AM CDT | Special Weather Statement | LOT | Lee, Ogle | 52 min |
| Jul 20, 6:47 AM CDT | Special Weather Statement | LOT | DeKalb, LaSalle, Lee | 43 min |
| Jul 20, 7:14 AM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kane, Kendall, Lake, Will | 2 hr |
| Jul 20, 7:21 AM CDT | River Flood Advisory | LOT | Winnebago | 7 days |
| Jul 20, 7:21 AM CDT | River Flood Advisory | LOT | Ogle | 5 days |
| Jul 20, 7:21 AM CDT | River Flood Advisory | LOT | Lee | 66 hr |
| Jul 20, 7:27 AM CDT | Special Weather Statement | LOT | Grundy, Kendall, LaSalle, Livingston | 48 min |
| Jul 20, 8:15 AM CDT | River Flood Warning | LOT | Cook | 5 days |
| Jul 20, 9:23 AM CDT | River Flood Watch | LOT | Winnebago | 24 hr |
| Jul 20, 9:30 AM CDT | River Flood Advisory | LOT | Boone | 4 days |
| Jul 20, 9:30 AM CDT | River Flood Advisory | LOT | Winnebago | 52 hr |
| Jul 20, 9:30 AM CDT | River Flood Advisory | LOT | Winnebago | 7 days |
| Jul 20, 9:30 AM CDT | River Flood Advisory | LOT | Winnebago | 7 days |
| Jul 20, 2:15 PM CDT | Flash Flood Watch | LOT | Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more | 42 hr |
| Jul 20, 2:51 PM CDT | River Flood Warning | LOT | Winnebago | 6 days |
| Jul 20, 2:51 PM CDT | River Flood Warning | LOT | Winnebago | 19 days |
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; radar from the NEXRAD Level II archive.