Alert archive / Illinois / Special Weather Statements in 2021
Special Weather Statement, NWS Chicago, IL
NWS Chicago, IL issued this special weather statement at Aug 6, 2021, 8:49 PM CDT for Lake 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 outline as issued.
The facts
- Issued
- Aug 6, 2021, 8:49 PM CDT (01:49 UTC)
- Expired
- Aug 6, 2021, 9:45 PM CDT
- In force
- 56 min
- Issued by
- NWS Chicago, IL
- Hail
- 0.00 in
- Wind
- 40
County Lake County, IL
The radar
The Chicago radar (KLOT), 81 km from the middle of the area, began a volume at 01:50 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, 1.8 hours before the alert went out and 228 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
- 2016 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 1080 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
884
WWUS83 KLOT 070149
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville
849 PM CDT Fri Aug 6 2021
ILZ006-070245-
Lake IL-
849 PM CDT Fri Aug 6 2021
...Strong thunderstorms will impact portions of Lake County through
945 PM CDT...
At 848 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Wheatland to Grandwood Park to near Lake Bluff.
Movement was southeast at 25 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Waukegan, Arlington Heights, Palatine, Buffalo Grove, Wheeling,
Northbrook, North Chicago, Gurnee, Mundelein, Highland Park, Round
Lake Beach, Vernon Hills, Zion, Grayslake, Libertyville, Lake Zurich,
Lake Forest, Round Lake, Antioch and Wauconda.
Including the following interstates...
I-94 between mile markers 1 and 26.
I-294 between mile markers 1 and 26.
This includes... Chain O Lakes State Park, College of Lake County,
Great Lakes Naval Training Center, Lake County IL Fairgrounds, Lake
Forest College, Ravinia Music Festival, and Six Flags Great America.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4249 8780 4229 8783 4221 8780 4215 8776
4215 8820 4250 8820
TIME...MOT...LOC 0148Z 333DEG 20KT 4258 8818 4241 8798 4228 8781
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
$$
PetrThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 7:56 PM CDT | Special Marine Warning | LOT | 94 min | |
| Aug 6, 8:27 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Aug 7, 12:20 AM CDT | Special Weather Statement | LOT | Jasper | 40 min |
| Aug 7, 1:32 AM CDT | Areal Flood Advisory | LOT | Jasper | 118 min |
| Aug 7, 2:05 AM CDT | Special Weather Statement | LOT | Jasper | 55 min |
Nearby
Special Weather Statements in Illinois, 2021Every special weather statement in 2021
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.