Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 325, NWS Quad Cities, IA

July 30, 2024Jefferson County, Keokuk County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 30, 2024, 10:51 AM CDT for Jefferson County, Keokuk County, 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: Jul 30, 2024, 10:51 AM CDT (15:51 UTC)
Expired: Jul 30, 2024, 11:30 AM CDT
In force: 39 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jefferson County, IA, Keokuk County, IA

The radar

The Quad Cities radar (KDVN), 133 km from the middle of the area, began a volume at 15:54 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
Jul 30, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 3.9 hours before the alert went out and 139 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: 1092 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Jul 30, 9:54 AM CDT, 57 minutes earlier.

Area forecast discussion, Jul 30, 9:54 AM CDT, 57 minutes before

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Hazardous weather outlook, Jul 30, 10:05 AM CDT, 46 minutes before

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In the hours before

Local storm report, Jul 30, 6:30 AM CDT, 4 hours 21 minutes before

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Local storm report, Jul 30, 6:32 AM CDT, 4 hours 19 minutes before

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Local storm report, Jul 30, 7:25 AM CDT, 3 hours 26 minutes before

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Local storm report, Jul 30, 8:37 AM CDT, 2 hours 14 minutes before

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Local storm report, Jul 30, 9:33 AM CDT, 1 hour 18 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
933 AM CDT Tue Jul 30 2024

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

0539 AM     Tstm Wnd Dmg     1 SSW Mooar             40.44N 91.45W
07/30/2024                   Lee                IA   Trained Spotter

            Delayed report via social media and time
            estimated from radar. Tree limbs down.

&&

Local storm report, Jul 30, 9:55 AM CDT, 56 minutes before

Preliminary Local Storm Report...Summary
National Weather Service Quad Cities IA IL
955 AM CDT Tue Jul 30 2024

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

0405 AM     Tstm Wnd Dmg     2 SW Charlie Heath Memo 40.55N 91.91W
07/30/2024                   Clark              MO   Trained Spotter

            snapped a 3-4 inch tree, and relocated small
            yrd items.

0438 AM     Tstm Wnd Dmg     Sigourney               41.33N 92.21W
07/30/2024                   Keokuk             IA   Public

            Delayed report via social media. Several
            tree limbs down. Largest was 18 inches.

0454 AM     Tstm Wnd Dmg     Memphis                 40.46N 92.17W
07/30/2024                   Scotland           MO   Public

            Delayed report and time estimated from
            radar. Many tree limbs down.

0504 AM     Tstm Wnd Gst     3 ENE Charlie Heath Mem 40.59N 91.84W
07/30/2024  E50 MPH          Clark              MO   Trained Spotter

            At least 50 mph.

0505 AM     Tstm Wnd Gst     3 NW Charlie Heath Memo 40.60N 91.94W
07/30/2024  E50 MPH          Clark              MO   Trained Spotter

0523 AM     Tstm Wnd Dmg     1 S Donnellson          40.63N 91.56W
07/30/2024                   Lee                IA   CO-OP Observer

            Power lines down at the farm.

0539 AM     Tstm Wnd Dmg     1 SSW Mooar             40.44N 91.45W
07/30/2024                   Lee                IA   Trained Spotter

            Delayed report via social media and time
            estimated from radar. Tree limbs down.

0547 AM     Tstm Wnd Gst     Burlington Regional Air 40.78N 91.13W
07/30/2024  M59 MPH          Des Moines         IA   ASOS

            ASOS.

0619 AM     Tstm Wnd Gst     4 E Fandon              40.38N 90.70W
07/30/2024  M65 MPH          McDonough          IL   Trained Spotter

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 2:32 AM CDT	Heat Advisory	DVN	Lee, Van Buren	8 hr
Jul 30, 4:37 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Jefferson, Van Buren	38 min
Jul 30, 4:44 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	46 min
Jul 30, 5:03 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more	42 min
Jul 30, 11:34 AM CDT	Special Weather Statement	DVN	Henry, Jefferson, Keokuk, Louisa, Washington	41 min
Jul 30, 12:15 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Louisa	45 min
Jul 30, 2:15 PM CDT	Flood Watch	DVN	Cedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more	44 hr
Jul 30, 2:34 PM CDT	Special Weather Statement	DVN	Keokuk	41 min
Jul 30, 2:41 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	49 min
Jul 30, 3:34 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Jefferson	41 min
Jul 30, 3:38 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Lee, Van Buren	52 min
Jul 30, 4:30 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	45 min
Jul 30, 5:41 AM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	49 min
Jul 30, 6:07 AM CDT	Severe Thunderstorm Warning	DVN	Henderson, McDonough, Warren	53 min
Jul 30, 5:35 PM CDT	Special Weather Statement	DVN	McDonough	55 min

Nearby

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.