Alert archive / Illinois / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 13, NWS Chicago, IL

March 4, 2024DeKalb County, Ogle County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Mar 4, 2024, 6:01 PM CST for DeKalb County, Ogle County, Illinois. It was in force for 44 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 4, 2024, 6:01 PM CST (00:01 UTC)
Expired: Mar 4, 2024, 6:45 PM CST
In force: 44 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties DeKalb County, IL, Ogle County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 00:03 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, 0.0 hours before the alert went out and 127 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 829 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 304 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

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 4, 5:17 PM CST, 44 minutes earlier.

Area forecast discussion, Mar 4, 5:17 PM CST, 44 minutes before

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Hazardous weather outlook, Mar 4, 2:28 PM CST, 3 hours 33 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
228 PM CST Mon Mar 4 2024

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-052030-
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-
228 PM CST Mon Mar 4 2024 /328 PM EST Mon Mar 4 2024/

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:
     Limited Hail Risk...up to 1 inch in diameter.
     Limited Damaging Wind Risk...up to 50 mph.

DISCUSSION...

Showers and thunderstorms will continue developing along and ahead
of a cold front this afternoon and evening, and then move across
the entire area overnight. The strongest storms may produce
locally damaging hail and gusty winds, as well as frequent cloud
to ground lightning and downpours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

 Spotters may be needed this afternoon though this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the northeast at 40 mph.

LMZ740>745-052030-
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-
228 PM CST Mon Mar 4 2024

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...

  Hazardous conditions for small craft.
  Elevated Thunderstorm Risk Tonight...with an associated:
     Limited Hail Risk...up to Quarter size.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday, Wednesday, and Friday through Sunday...
  Hazardous conditions for small craft are likely.

Borchardt

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In the hours before

Local storm report, Mar 4, 3:58 PM CST, 2 hours 3 minutes before

Preliminary Local Storm Report
National Weather Service Chicago IL
358 PM CST Mon Mar 4 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0246 PM     Hail             Lake Summerset          42.45N 89.40W
03/04/2024  E0.88 inch       Winnebago          IL   Public

            Multiple photos shared to social media show
            hail up to approximately nickel size in the
            Lake Summerset area. Time estimated by
            radar.

&&

WSL

Local storm report, Mar 4, 4:47 PM CST, 1 hour 14 minutes before

Preliminary Local Storm Report
National Weather Service Chicago IL
447 PM CST Mon Mar 4 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0440 PM     Hail             1 NNW Dixon             41.85N 89.49W
03/04/2024  M0.70 inch       Lee                IL   Public

            Photo shared to social media shows dime size
            hail in Dixon. Time estimated by radar.

&&

WSL

Local storm report, Mar 4, 4:52 PM CST, 1 hour 9 minutes before

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Local storm report, Mar 4, 4:54 PM CST, 1 hour 7 minutes before

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Local storm report, Mar 4, 4:59 PM CST, 1 hour 2 minutes before

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Local storm report, Mar 4, 5:58 PM CST, 3 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 4, 9:26 PM CST	Special Weather Statement	LOT	Cook	34 min
Mar 4, 10:26 PM CST	Special Weather Statement	LOT	LaSalle	34 min
Mar 4, 11:03 PM CST	Special Weather Statement	LOT	Kendall	27 min
Mar 4, 11:25 PM CST	Special Weather Statement	LOT	Kendall	35 min
Mar 5, 12:01 AM CST	Areal Flood Advisory	LOT	Cook, DuPage, Will	6 hr
Mar 5, 12:13 AM CST	Special Weather Statement	LOT	Will	32 min
Mar 5, 1:38 AM CST	Areal Flood Advisory	LOT	Grundy, Kendall, LaSalle, Livingston	4 hr
Mar 5, 1:49 AM CST	Special Weather Statement	LOT	LaSalle	26 min
Mar 5, 2:13 AM CST	Special Weather Statement	LOT	Benton	32 min
Mar 5, 2:27 AM CST	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	28 min
Mar 5, 2:52 AM CST	Special Weather Statement	LOT	Jasper	38 min
Mar 5, 3:14 AM CST	Special Weather Statement	LOT	Benton	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2024 Every severe thunderstorm warning in 2024

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.