Alert archive / Illinois / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 73, NWS Quad Cities, IA

April 16, 2024Des Moines County, Louisa County, Iowa; Henderson County, Mercer County, Warren County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 16, 2024, 6:56 PM CDT for Des Moines County, Louisa County, Iowa; Henderson County, Mercer County, Warren County, Illinois. It was in force for 64 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: Apr 16, 2024, 6:56 PM CDT (23:56 UTC)
Expired: Apr 16, 2024, 8:00 PM CDT
In force: 64 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Des Moines County, IA, Louisa County, IA, Henderson County, IL, Mercer County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 23:54 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 16, 12:06 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.9 hours before the alert went out and 78 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: 1439 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 16, 6:48 PM CDT, 8 minutes earlier.

Area forecast discussion, Apr 16, 6:48 PM CDT, 8 minutes before

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Hazardous weather outlook, Apr 16, 3:36 PM CDT, 3 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
336 PM CDT Tue Apr 16 2024

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-171100-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
336 PM CDT Tue Apr 16 2024

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Rounds of strong to severe storms will continue through tonight.
The Storm Prediction Center has an Enhance Risk for much of the
area, with a Slight Risk for the far east and northeast parts of
the area. Large hail, possibly over golf ball size, damaging
winds, and tornadoes are all possible. Locally heavy rainfall will
also occur, possibly producing ponding of water, urban and small
stream flooding.

Away from the storms, strong gradient winds may gust up to 45 MPH
through the evening.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Thunderstorms are possible in northwest Illinois Wednesday
afternoon, with lightning the main risk.

Thunderstorms are possible south of Interstate 80 on Thursday,
with lightning the main threat.

Frost and or freeze may be possible Friday night and Saturday
night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed through the evening.

GENERAL STORM MOTION OF THE DAY: Quickly North-northeast at 40 to
60 MPH.

12

In the hours before

Local storm report, Apr 16, 6:37 PM CDT, 19 minutes before

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Local storm report, Apr 16, 6:38 PM CDT, 18 minutes before

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Local storm report, Apr 16, 6:40 PM CDT, 16 minutes before

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Local storm report, Apr 16, 6:41 PM CDT, 15 minutes before

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Local storm report, Apr 16, 6:45 PM CDT, 11 minutes before

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Local storm report, Apr 16, 6:48 PM CDT, 8 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 5:30 AM CDT	Special Weather Statement	DVN	Buchanan	15 min
Apr 16, 11:47 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	43 min
Apr 16, 1:12 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren	33 min
Apr 16, 1:14 PM CDT	Severe Thunderstorm Warning	DVN	Lee	46 min
Apr 16, 2:34 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	41 min
Apr 16, 2:48 PM CDT	Tornado Warning	DVN	Benton, Buchanan, Linn	27 min
Apr 16, 2:58 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Jones, Linn	47 min
Apr 16, 3:02 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	43 min
Apr 16, 3:13 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	32 min
Apr 16, 3:15 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Buchanan, Delaware, Dubuque, Johnson, Jones, Linn	45 min
Apr 16, 3:17 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	43 min
Apr 16, 3:20 PM CDT	Tornado Warning	DVN	Cedar, Delaware, Dubuque, Jones, Linn	25 min
Apr 16, 3:39 PM CDT	Tornado Warning	DVN	Van Buren	51 min
Apr 16, 3:43 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren, Washington	47 min
Apr 16, 3:47 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	13 min
Apr 16, 3:47 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	43 min
Apr 16, 3:57 PM CDT	Severe Thunderstorm Warning	DVN	Washington	33 min
Apr 16, 4:13 PM CDT	Tornado Warning	DVN	Henry, Lee, Van Buren	47 min
Apr 16, 4:17 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Linn	28 min
Apr 16, 4:23 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 5 more	52 min
Apr 16, 4:25 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Johnson, Louisa, Muscatine, Washington	50 min
Apr 16, 4:49 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jackson	41 min
Apr 16, 4:51 PM CDT	Tornado Warning Tornado observed	DVN	Des Moines, Henry, Louisa	39 min
Apr 16, 4:54 PM CDT	Tornado Warning	DVN	Des Moines, Lee	51 min
Apr 16, 5:02 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jackson, Jones	43 min
Apr 16, 5:14 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jackson, Jones, Muscatine, Scott	21 min
Apr 16, 5:20 PM CDT	Tornado Warning	DVN	Louisa	40 min
Apr 16, 5:40 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Louisa	50 min
Apr 16, 5:46 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Lee	29 min
Apr 16, 5:54 PM CDT	Severe Thunderstorm Warning	DVN	Muscatine, Scott	51 min
Apr 16, 5:59 PM CDT	Tornado Warning	DVN	Scott	31 min
Apr 16, 6:22 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	23 min
Apr 16, 6:42 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson, Scott	48 min
Apr 16, 1:38 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	37 min
Apr 16, 6:20 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island, Warren	36 min
Apr 16, 6:41 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	49 min
Apr 16, 4:14 PM CDT	Tornado Warning	DVN	Clark, Scotland	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2024 Severe Thunderstorm Warnings in Iowa, 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.