Alert archive / Illinois / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 1, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Mar 28, 2020, 7:01 PM CDT for Boone County, Ogle County, Winnebago County, Illinois. It was in force for 29 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
- Mar 28, 2020, 7:01 PM CDT (00:01 UTC)
- Expired
- Mar 28, 2020, 7:30 PM CDT
- In force
- 29 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Boone County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 93 km from the middle of the area, began a volume at 00:02 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, 0.0 hours before the alert went out and 134 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
- 504 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 963 m above ground
- 0-6 km bulk shear
- 88 kt
- 0-1 km storm-relative helicity
- 480 m²/s²
- 0-3 km storm-relative helicity
- 520 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 9.3
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 Mar 28, 6:43 PM CDT, 18 minutes earlier.
Area forecast discussion, Mar 28, 6:43 PM CDT, 18 minutes before
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</html>Hazardous weather outlook, Mar 28, 2:56 PM CDT, 4 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
256 PM CDT Sat Mar 28 2020
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-292000-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
256 PM CDT Sat Mar 28 2020 /356 PM EDT Sat Mar 28 2020/
This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.
.DAY ONE...Tonight.
Weather hazards expected...
Significant Thunderstorm Risk...with an associated:
Significant Tornado risk.
Significant hail risk...up to tennis ball size.
Elevated damaging wind risk...up to 60 mph.
Limited Flooding Risk.
DISCUSSION...
An outbreak of severe thunderstorms remains possible this afternoon
and evening, with the potential for very large hail and tornadoes,
including some threat of significant tornadoes. While the threat
of severe weather will exist across the entire outlook area, the
greatest threat for tornadoes will be around and southwest of a
line from Dixon to Dwight to Watseka. Thunderstorm movement will
be rapidly to the northeast.
Late tonight, strong southwest to west winds will develop, with
gusts to 45 mph expected by morning.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Sunday...
Elevated Non Thunderstorm Wind Risk.
DISCUSSION:
Strong west to southwest winds gusting up to 45 mph are expected
Sunday.
.SPOTTER INFORMATION STATEMENT...
Any reports of severe weather will be greatly appreciated this
afternoon and evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the northeast at 50 to 60 mph.
LMZ740>745-292000-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
256 PM CDT Sat Mar 28 2020
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...
Gale force winds and or very hazardous waves.
Significant Thunderstorm Risk...with an associated:
Significant hail risk...up to half dollar size.
Elevated thunderstorm wind gust risk...up to 60 mph.
Elevated Fog Risk.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Sunday...
Gale force winds and or very hazardous waves are likely.
Friday...
Hazardous conditions for small craft are likely.
Kluber
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Special weather statement, Mar 28, 4:29 PM CDT, 2 hours 32 minutes before
SPECIAL WEATHER STATEMENT National Weather Service Chicago/Romeoville IL 429 PM CDT Sat Mar 28 2020 ILZ006-103-104-290030- Lake IL-Northern Cook-Central Cook- Including the cities of Waukegan, Buffalo Grove, North Chicago, Highland Park, Mundelein, Gurnee, Round Lake Beach, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 429 PM CDT Sat Mar 28 2020 ...Dense Fog near the lake... Dense fog with visiblity to one quarter mile or less is possible at times through mid evening. Fog will occasionally lift with periods of showers or storms, so visibility may vary frequently and over short distances. Use caution if traveling near the lakefront in Lake and Cook Counties. KMD
Special weather statement, Mar 28, 6:49 PM CDT, 12 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
649 PM CDT Sat Mar 28 2020
ILZ003-008-290015-
Winnebago IL-Ogle IL-
649 PM CDT Sat Mar 28 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OGLE AND
SOUTHEASTERN WINNEBAGO COUNTIES UNTIL 715 PM CDT...
At 649 PM CDT, Doppler radar was tracking a strong thunderstorm over
Oregon, moving northeast at 65 mph.
Up to nickel size hail will be possible with this storm.
Locations impacted include...
Rockford, Loves Park, Machesney Park, Oregon, Rockford Airport,
Roscoe, Byron, Cherry Valley, Stillman Valley, Davis Junction and New
Millford.
Including the following interstates...
I-39 between mile markers 111 and 123.
I-90 between mile markers 11 and 18.
This includes... Lowden State Park, Rock Cut State Park, Rock Valley
College, Rockford Rivets Baseball, and Rockford Speedway.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4241 8906 4233 8894 4214 8894 4197 8926
4198 8934 4204 8936
TIME...MOT...LOC 2349Z 222DEG 56KT 4202 8929
BorchardtThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 8:53 PM CDT | Tornado Warning | LOT | Lee, Ogle | 37 min |
| Mar 28, 9:19 PM CDT | Tornado Warning | LOT | Ogle, Winnebago | 26 min |
| Mar 28, 11:37 PM CDT | Special Marine Warning | LOT | 53 min | |
| Mar 28, 11:41 PM CDT | Special Weather Statement | LOT | Cook | 19 min |
| Mar 29, 12:36 AM CDT | River Flood Warning | LOT | Bureau, LaSalle, Putnam | 5 days |
| Mar 29, 4:58 AM CDT | River Flood Warning | LOT | Lake | 30 hr |
| Mar 29, 4:58 AM CDT | River Flood Warning | LOT | Cook | 30 hr |
| Mar 29, 8:25 AM CDT | River Flood Advisory | LOT | LaSalle | 47 hr |
| Mar 29, 10:17 AM CDT | River Flood Advisory | LOT | Winnebago | 6 days |
Nearby
Severe Thunderstorm Warnings in Illinois, 2020Every severe thunderstorm warning in 2020
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.