Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 95, NWS Quad Cities, IA

April 27, 20244 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 27, 2024, 8:09 PM CDT for 4 counties in Iowa. It was in force for 39 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 27, 2024, 8:09 PM CDT (01:09 UTC)
Expired
Apr 27, 2024, 8:48 PM CDT
In force
39 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Cedar County, IA, Clinton County, IA, Jones County, IA, Scott County, IA

The radar

The Quad Cities radar (KDVN), 35 km from the middle of the area, began a volume at 01:11 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.

IssuedProductOfficeLasted
Apr 27, 5:58 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 39 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2024-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1529 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2024-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1529 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1148 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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 27, 6:20 PM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Apr 27, 6:20 PM CDT, 1 hour 49 minutes before
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Hazardous weather outlook, Apr 27, 3:23 PM CDT, 4 hours 46 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
323 PM CDT Sat Apr 27 2024

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-282030-
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-
323 PM CDT Sat Apr 27 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

Southerly wind gusts may occasionally reach 35 to 45 mph this
afternoon.

Thunderstorms are expected to develop this afternoon through
tonight. Severe weather is expected with large hail and damaging
winds the main threats. An isolated tornado cannot be ruled out
this evening. The Storm Prediction Center has placed portions of
eastern Iowa, northeast Missouri and west central Illinois in an
Enhanced risk, or level 3 out of 5, for severe weather, with the
remainder of the area in a Slight risk, or level 2 out of 5.

Heavy rainfall will also be possible with the storms and could
lead to a localized flooding risk. A Flood Watch has been issued
for southeast Iowa, west central Illinois, and northeast Missouri,
where rainfall totals around 1 to 2 inches will be possible
tonight.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Additional showers and storms are expected on Sunday. A few of
these storms could be severe Sunday afternoon and evening with
damaging winds, large hail, and isolated tornadoes. Heavy rainfall
could also pose a localized flooding risk.

The pattern will turn active once again Tuesday night through
Friday, with several chances for storms. It is too soon to
determine the severe weather threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed at times through Sunday
evening.

GENERAL STORM MOTION OF THE DAY:

Toward the northeast at 30 to 40 MPH.

In the hours before

Special weather statement, Apr 27, 2:55 PM CDT, 5 hours 14 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
255 PM CDT Sat Apr 27 2024

ILZ002-007-272045-
Carroll IL-Stephenson IL-
255 PM CDT Sat Apr 27 2024

...A strong thunderstorm will impact portions of northeastern Carroll
and central Stephenson Counties through 345 PM CDT
...

At 255 PM CDT, Doppler radar was tracking a strong thunderstorm near
Pearl City, or 7 miles west of Freeport, moving northeast at 30 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could cause minor tree limb damage and blow
         around unsecured objects. Minor damage to outdoor objects
         is possible.

Locations impacted include...
Freeport, Lena, Pearl City, Cedarville, Davis, Dakota, Rock City,
Ridott, Rock Grove, Eleroy, Red Oak, Damascus, Afolkey, Scioto Mills,
Winneshiek, Dakota Dornink Airport, Albertus Airport, Bolton,
Stephenson  County Fairgrounds, and Lake Summerset.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4250 8940 4232 8940 4218 8976 4233 8989
      4250 8953
TIME...MOT...LOC 1955Z 238DEG 26KT 4230 8977

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

DC
Local storm report, Apr 27, 3:22 PM CDT, 4 hours 47 minutes before
Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
322 PM CDT Sat Apr 27 2024

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

0303 PM     Hail             2 N Freeport            42.32N 89.63W
04/27/2024  M0.50 Inch       Stephenson         IL   Public

            Report from mPING: Half-inch (0.50 in.).

&&
Local storm report, Apr 27, 3:32 PM CDT, 4 hours 37 minutes before
Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
332 PM CDT Sat Apr 27 2024

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

0329 PM     Hail             3 S Rock City           42.37N 89.46W
04/27/2024  E0.75 Inch       Stephenson         IL   Public

            Report from mPING: Dime (0.75 in.).

&&
Special weather statement, Apr 27, 4:14 PM CDT, 3 hours 55 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
414 PM CDT Sat Apr 27 2024

IAZ041-042-272200-
Delaware IA-Dubuque IA-
414 PM CDT Sat Apr 27 2024

...A strong thunderstorm will impact portions of east central
Delaware and northwestern Dubuque Counties through 500 PM CDT
...

At 413 PM CDT, Doppler radar was tracking a strong thunderstorm over
Dyersville, or 16 miles east of Manchester, moving northeast at 30
mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could cause minor tree limb damage and blow
         around unsecured objects. Minor damage to outdoor objects
         is possible.

Locations impacted include...
Dubuque, Asbury, Dyersville, Epworth, Farley, Earlville, New Vienna,
Worthington, Holy Cross, Luxemburg, Rickardsville, Sherrill,
Sageville, Balltown, Bankston, Durango, Graf, Bankston Park, Cottage
Hill, and New Wine Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4264 9071 4259 9068 4257 9066 4235 9111
      4247 9130 4265 9112 4265 9090 4268 9089
TIME...MOT...LOC 2113Z 220DEG 28KT 4247 9114

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Speck
Local storm report, Apr 27, 5:26 PM CDT, 2 hours 43 minutes before
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Local storm report, Apr 27, 5:58 PM CDT, 2 hours 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 7:03 PM CDTSevere Thunderstorm WarningDVNIowa, Johnson, Keokuk, Washington42 min
Apr 27, 7:35 PM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Muscatine, Washington40 min
Apr 27, 7:40 PM CDTSevere Thunderstorm WarningDVNJefferson, Van Buren50 min
Apr 27, 7:41 PM CDTSevere Thunderstorm WarningDVNLouisa, Muscatine, Washington34 min
Apr 27, 7:58 PM CDTSevere Thunderstorm WarningDVNJefferson28 min
Apr 27, 8:06 PM CDTSevere Thunderstorm WarningDVNHenry, Lee, Washington39 min
Apr 27, 8:07 PM CDTSevere Thunderstorm WarningDVNCedar, Muscatine, Scott38 min
Apr 27, 8:39 PM CDTSpecial Weather StatementDVNScott51 min
Apr 28, 1:49 PM CDTRiver Flood WarningDVNDes Moines, Henry, Lee19 hr
Apr 28, 8:05 AM CDTRiver Flood WarningDVNClark31 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2024Every 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.