Alert archive / Illinois / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 43, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 13, 2018, 7:04 PM CDT for Ogle County, Winnebago County, Illinois. It was in force for 56 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 13, 2018, 7:04 PM CDT (00:04 UTC)
- Expired
- Jul 13, 2018, 8:00 PM CDT
- In force
- 56 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Ogle County, IL, Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 103 km from the middle of the area, began a volume at 00:07 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, 0.1 hours before the alert went out and 122 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
- 1696 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1134 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- -44 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 13, 7:03 PM CDT, 1 minute earlier.
Area forecast discussion, Jul 13, 7:03 PM CDT, 1 minute before
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</html>Hazardous weather outlook, Jul 13, 3:30 PM CDT, 3 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
330 PM CDT Fri Jul 13 2018
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
142030-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
330 PM CDT Fri Jul 13 2018 /430 PM EDT Fri Jul 13 2018/
This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited damaging wind risk...up to 60 mph.
Limited Flooding Risk.
DISCUSSION...
Thunderstorms are likely to spread into portions of far northern
Illinois this evening, including the Rockford metropolitan area.
Depending on how organized the thunderstorms become and how
quickly they move into the area, isolated marginally severe wind
gusts will be possible. Outside of any severe wind risk, all
thunderstorms can be expected to produce occasional to frequent
cloud to ground lightning and very heavy downpours, with a
localized flooding risk.
In addition, heat indices will be around 100 degrees this
afternoon from the far western suburbs of Chicago south to Pontiac
and then west to the Mississippi River.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Saturday...
Elevated Thunderstorm Risk.
Limited Flooding Risk.
Limited Excessive Heat Risk.
Sunday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Monday...
Elevated Thunderstorm Risk.
Limited Excessive Heat Risk.
Limited Coastal Flood Risk
Tuesday...
Limited Coastal Flood Risk
Wednesday and Thursday...
Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed this evening in northwest and north central
Illinois.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east at around 30 mph.
LMZ740>745-142030-
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-
330 PM CDT Fri Jul 13 2018
This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited thunderstorm wind gust risk...up to 34 to 50 knots.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Saturday through Monday...
Limited Thunderstorm Risk.
Thursday...
Limited Thunderstorm Risk.
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-142030-
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 Holland to Whitehall MI 5 nm off shore to mid-
line of 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-
330 PM CDT Fri Jul 13 2018
This Hazardous Weather Outlook is for portions of the open waters
of Lake Michigan.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited thunderstorm wind gust risk...up to 34 to 50 knots.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Saturday through Tuesday...
Limited Thunderstorm Risk.
Thursday...
Limited Thunderstorm Risk.
MTF
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www.youtube.com/nwschicagoThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 7:46 PM CDT | Special Weather Statement | LOT | Winnebago | 29 min |
| Jul 13, 8:05 PM CDT | Special Weather Statement | LOT | Ogle | 40 min |
| Jul 13, 8:47 PM CDT | Special Weather Statement | LOT | Lee | 28 min |
| Jul 13, 9:18 PM CDT | Special Weather Statement | LOT | Lee | 27 min |
| Jul 13, 9:49 PM CDT | Special Weather Statement | LOT | DeKalb | 26 min |
| Jul 14, 9:02 AM CDT | Special Weather Statement | LOT | Ford | 43 min |
| Jul 14, 9:17 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 43 min |
| Jul 14, 9:51 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 39 min |
| Jul 14, 10:20 AM CDT | Severe Thunderstorm Warning | LOT | Benton | 31 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2018Every severe thunderstorm warning in 2018
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.