Alert archive / Illinois / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 26, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 14, 2018, 4:42 AM CDT for Ogle County, Winnebago County, Illinois. It was in force for 48 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
- May 14, 2018, 4:42 AM CDT (09:42 UTC)
- Expired
- May 14, 2018, 5:30 AM CDT
- In force
- 48 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 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 09:46 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, 9.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1260 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 241 m²/s²
- 0-3 km storm-relative helicity
- 314 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 May 14, 2:58 AM CDT, 1 hour 44 minutes earlier.
Area forecast discussion, May 14, 2:58 AM CDT, 1 hour 44 minutes before
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</html>Hazardous weather outlook, May 14, 3:35 AM CDT, 1 hour 7 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
335 AM CDT Mon May 14 2018
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
150845-
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-
335 AM CDT Mon May 14 2018 /435 AM EDT Mon May 14 2018/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR North Central Illinois...
Northeast Illinois AND Northwest Indiana.
.DAY ONE...Today and Tonight.
WEATHER HAZARDS EXPECTED:
Significant Thunderstorm Risk...with an associated:
Elevated Hail Risk...up to quarter size.
Elevated Thunderstorm Wind Damage Risk...up to 60 mph.
Elevated Flooding Risk.
DISCUSSION:
A few more rounds of showers and thunderstorms are expected, both to
start the day and again later today into tonight. Heavy rainfall is
the main hazard with the first round of storms, with isolated large hail
possible. Winds may gust to 40 mph. With the additional storms that
will occur later today, large hail, damaging winds, and heavy rainfall
remain the primary hazards.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Tuesday...
Elevated Thunderstorm Risk.
Wednesday through Friday...
Limited Thunderstorm Risk mainly south of I-80.
Saturday...
Elevated Thunderstorm Risk.
Sunday...
Limited Thunderstorm Risk.
DISCUSSION:
Thunderstorm chances continue this week but with lower
probabilities.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed early this morning, and again this afternoon
or evening.
GENERAL STORM MOTION OF THE DAY:
Moving east at 30 to 40 mph.
&&
LMZ740>745-150845-
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-
335 AM CDT Mon May 14 2018
THIS HAZARDOUS WEATHER OUTLOOK IS FOR the Illinois nearshore
waters of Lake Michigan AND the Indiana nearshore waters of Lake
Michigan.
.DAY ONE...Today and Tonight.
Elevated Thunderstorm Risk.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Tuesday Morning...
Elevated Thunderstorm Risk.
Friday through Sunday...
Limited Thunderstorm Risk.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-150845-
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-
335 AM CDT Mon May 14 2018
THIS HAZARDOUS WEATHER OUTLOOK IS FOR the open waters of Lake
Michigan.
.DAY ONE...Today and Tonight.
Elevated Thunderstorm Risk for the south half of the lake this
morning.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Limited Thunderstorm Risk Tuesday for the south half, and
again Saturday and Sunday for the entire lake.
&&
KMD
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Special weather statement, May 14, 3:43 AM CDT, 59 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 3:43 AM CDT | Special Weather Statement | LOT | Ogle | 32 min |
| May 14, 5:09 AM CDT | Special Weather Statement | LOT | Boone, Lee, Ogle, Winnebago | 36 min |
| May 14, 6:41 AM CDT | Areal Flood Advisory | LOT | Cook, DuPage | 3 hr |
| May 14, 6:43 AM CDT | Areal Flood Warning | LOT | Lake | 6 hr |
| May 14, 8:13 AM CDT | Special Weather Statement | LOT | Lee | 32 min |
| May 14, 10:50 AM CDT | Marine Dense Fog Advisory | LOT | 10 hr | |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Lake | 6 days |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Lake | 11 days |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Lake | 56 hr |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Cook | 68 hr |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Kane, McHenry | 46 hr |
| May 14, 11:28 AM CDT | River Flood Warning | LOT | Kane, Kendall | 5 days |
| May 14, 11:42 AM CDT | River Flood Advisory | LOT | Cook | 3 days |
| May 14, 11:42 AM CDT | River Flood Advisory | LOT | Cook | 65 hr |
| May 14, 11:42 AM CDT | River Flood Advisory | LOT | Lake | 45 hr |
| May 14, 3:39 PM CDT | Special Weather Statement | LOT | Lee | 21 min |
| May 14, 3:50 PM CDT | Special Weather Statement | LOT | DeKalb, Kane | 25 min |
| May 14, 3:57 PM CDT | Special Weather Statement | LOT | Ogle | 33 min |
| May 14, 4:00 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 45 min |
| May 14, 4:23 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 52 min |
| May 14, 5:29 PM CDT | Special Marine Warning | LOT | 3 hr | |
| May 14, 5:39 PM CDT | Special Weather Statement | LOT | DuPage | 36 min |
| May 14, 6:10 PM CDT | Special Weather Statement | LOT | Cook, DuPage | 20 min |
| May 14, 7:27 AM CDT | Special Weather Statement | LOT | Porter | 33 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.