Alert archive / Illinois / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 119, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 16, 2017, 12:59 AM CDT for McHenry County, Illinois. It was in force for 35 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 16, 2017, 12:59 AM CDT (05:59 UTC)
- Expired
- Jul 16, 2017, 1:34 AM CDT
- In force
- 35 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County McHenry County, IL
The radar
The Milwaukee radar (KMKX), 72 km from the middle of the area, began a volume at 06:03 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, 6.0 hours before the alert went out and 187 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
- 819 J/kg
- Mixed-layer CIN
- -241 J/kg
- Mixed-layer LCL
- 1141 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 15, 9:14 PM CDT, 3 hours 45 minutes earlier.
Area forecast discussion, Jul 15, 9:14 PM CDT, 3 hours 45 minutes before
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</html>Hazardous weather outlook, Jul 15, 10:07 PM CDT, 2 hours 52 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1007 PM CDT Sat Jul 15 2017
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
170315-
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-
1007 PM CDT Sat Jul 15 2017 /1107 PM EDT Sat Jul 15 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Overnight.
WEATHER HAZARDS EXPECTED:
Limited Thunderstorm Risk...with an associated:
Limited Hail Risk...up to nickel to quarter size.
Limited Thunderstorm Wind Damage Risk...up to 50 to 60 MPH.
Flooding will continue along portions of the Fox and Des Plaines
rivers.
DISCUSSION:
A broken line of thunderstorms over central Wisconsin will drop
south into northern Illinois overnight. Thunderstorms will likely
be in a weakening phase or beginning to weaken around this time,
but there could still be a couple isolated strong to severe
thunderstorms that make it into areas mainly north of Interstate 88
in Illinois.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Sunday...
Limited Thunderstorm Risk.
High Swim Risk.
Tuesday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Wednesday and Thursday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
Friday...
Limited Thunderstorm Risk.
Flooding will continue along portions of the Fox and Des Plaines
Rivers.
.SPOTTER INFORMATION STATEMENT...
Spotters will likely not be needed overnight.
GENERAL STORM MOTION OF THE DAY:
Moving southeast at 25 to 35 mph.
&&
LMZ740>745-170315-
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-
1007 PM CDT Sat Jul 15 2017
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.
.DAY ONE...Overnight.
Limited Thunderstorm Risk.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Sunday...
Limited Thunderstorm Risk.
Hazardous Conditions for Small Craft are likely.
Tuesday through Friday...
Limited Thunderstorm Risk.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-170315-
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-
1007 PM CDT Sat Jul 15 2017
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...Overnight.
There is a chance of thunderstorms. Some of the thunderstorms could be
strong to severe.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
There will be periodic chances for thunderstorms Tuesday through
Thursday.
&&
RC
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Special weather statement, Jul 16, 12:50 AM CDT, 9 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville Il
1250 AM CDT SUN JUL 16 2017
ILZ003>006-160645-
Lake IL-Boone IL-McHenry IL-Winnebago IL-
1250 AM CDT SUN JUL 16 2017
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LAKE...NORTHERN
WINNEBAGO...MCHENRY AND BOONE COUNTIES UNTIL 145 AM CDT...
At 1247 AM CDT, Doppler radar was tracking strong thunderstorms
along a line across far southern Wisconsin. Movement was southeast
at 30 mph.
At least dime size hail and winds in excess of 40 mph will be
possible with the strongest storms in this line.
Locations impacted include...
Arlington Heights, Palatine, Buffalo Grove, Wheeling, Beloit,
Mundelein, Algonquin, McHenry, Vernon Hills, Woodstock, Loves Park,
Machesney Park, Grayslake, Libertyville, Lake Zurich, Round Lake,
Antioch, Wauconda and Fox Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4250 8804 4215 8795 4215 8803 4237 8940
4250 8940
TIME...MOT...LOC 0547Z 325DEG 27KT 4280 8966 4257 8818
MTFThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 12:50 AM CDT | Special Weather Statement | LOT | Boone, McHenry, Winnebago | 55 min |
| Jul 16, 1:39 AM CDT | Special Weather Statement | LOT | Boone, McHenry, Winnebago | 66 min |
| Jul 16, 2:36 AM CDT | Special Weather Statement | LOT | Boone, DeKalb, Kane, Ogle, Winnebago | 54 min |
| Jul 16, 2:51 AM CDT | Severe Thunderstorm Warning | LOT | Ogle | 39 min |
| Jul 16, 3:13 AM CDT | Special Marine Warning | LOT | 92 min | |
| Jul 16, 3:17 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Ogle | 28 min |
| Jul 16, 3:31 AM CDT | Special Weather Statement | LOT | Kendall, Will | 44 min |
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.