Alert archive / Iowa / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 113, NWS Quad Cities, IA

May 7, 2023Benton County, Iowa County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 7, 2023, 4:08 PM CDT for Benton County, Iowa County, Iowa. It was in force for 37 min. 20 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 7, 2023, 4:08 PM CDT (21:08 UTC)
Expired: May 7, 2023, 4:45 PM CDT
In force: 37 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Benton County, IA, Iowa County, IA

The radar

The Des Moines radar (KDMX), 128 km from the middle of the area, began a volume at 21:08 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.

What was reported inside it

Time	Report	Where	Remark
May 7, 4:28 PM CDT	HAIL 2.75	2 Se Koszta, IA
May 7, 4:28 PM CDT	HAIL 2.75	2 Se Koszta, IA
May 7, 4:32 PM CDT	TSTM WND GST 70	2 Sse Koszta, IA	ESTIMATED 70 MPH WINDS NEAR G AVENUE AND 212.
May 7, 4:32 PM CDT	TSTM WND GST 70	2 Sse Koszta, IA	ESTIMATED 70 MPH WINDS NEAR G AVENUE AND 212.
May 7, 4:32 PM CDT	TSTM WND GST 70	2 Sse Koszta, IA	ESTIMATED 70 MPH WINDS NEAR G AVENUE AND 212.
May 7, 4:32 PM CDT	HAIL 1.5	4 N Marengo, IA
May 7, 4:32 PM CDT	HAIL 1.5	4 N Marengo, IA
May 7, 4:32 PM CDT	HAIL 1.5	4 N Marengo, IA
May 7, 4:33 PM CDT	TSTM WND GST 65	1 Wsw Marengo, IA
May 7, 4:33 PM CDT	TSTM WND GST 65	1 Wsw Marengo, IA
May 7, 4:33 PM CDT	TSTM WND GST 65	1 Wsw Marengo, IA
May 7, 4:35 PM CDT	TSTM WND GST 60	1 S Marengo, IA	ESTIMATED HIGHER THAN 60 MPH WIND GUSTS.
May 7, 4:35 PM CDT	TSTM WND GST 60	1 S Marengo, IA	ESTIMATED HIGHER THAN 60 MPH WIND GUSTS.
May 7, 4:35 PM CDT	TSTM WND GST 60	1 S Marengo, IA	ESTIMATED HIGHER THAN 60 MPH WIND GUSTS.
May 7, 4:35 PM CDT	HAIL 1	1 S Marengo, IA	QUARTER SIZED HAIL.
May 7, 4:35 PM CDT	HAIL 1	1 S Marengo, IA	QUARTER SIZED HAIL.
May 7, 4:35 PM CDT	HAIL 1	1 S Marengo, IA	QUARTER SIZED HAIL.
May 7, 4:35 PM CDT	HAIL 1	1 Wsw Marengo, IA	MOSTLY DIMES.
May 7, 4:35 PM CDT	HAIL 1	1 Wsw Marengo, IA	MOSTLY DIMES.
May 7, 4:35 PM CDT	HAIL 1	1 Wsw Marengo, IA	MOSTLY DIMES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 8 storm reports to this severe thunderstorm warning; the first came 0 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.1 hours before the alert went out and 141 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: 806 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

917 
WUUS53 KDVN 072108
SVRDVN
IAC011-095-072145-
/O.NEW.KDVN.SV.W.0113.230507T2108Z-230507T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
408 PM CDT Sun May 7 2023

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Benton County in east central Iowa...
  Northwestern Iowa County in east central Iowa...

* Until 445 PM CDT.

* At 407 PM CDT, a severe thunderstorm was located near Belle Plaine,
  or 12 miles west of Marengo, moving east at 30 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Trained weather spotters.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Koszta around 420 PM CDT.
  Ladora and Hannen Lake Park around 425 PM CDT.

Other locations in the path of this severe thunderstorm include
Marengo, Genoa Bluff, Iowa County Fairgrounds and Williamsburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

LAT...LON 4188 9230 4186 9201 4162 9200 4172 9230
TIME...MOT...LOC 2107Z 288DEG 27KT 4185 9230 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Ervin

1 follow-up statement

315 
WWUS53 KDVN 072113
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
413 PM CDT Sun May 7 2023

IAC011-095-072145-
/O.CON.KDVN.SV.W.0113.000000T0000Z-230507T2145Z/
Benton IA-Iowa IA-
413 PM CDT Sun May 7 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHWESTERN BENTON AND NORTHWESTERN IOWA COUNTIES...

At 413 PM CDT, a severe thunderstorm was located over Koszta, or 9
miles west of Marengo, moving east at 30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Ladora around 420 PM CDT.
  Hannen Lake Park and Genoa Bluff around 425 PM CDT.

Other locations in the path of this severe thunderstorm include
Marengo, Iowa County Fairgrounds and Williamsburg.

LAT...LON 4188 9230 4186 9201 4162 9200 4172 9230
TIME...MOT...LOC 2113Z 288DEG 27KT 4184 9224 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Ervin

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 May 7, 2:27 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, May 7, 2:27 PM CDT, 1 hour 41 minutes before

Area Forecast Discussion
National Weather Service Quad Cities IA IL
227 PM CDT Sun May 7 2023

.SYNOPSIS...
Issued at 225 PM CDT Sun May 7 2023

Stationary frontal boundary lies across se NE to se IA to ne IL.
Temps were in the 80s south of the front with dewpoints in the
60s. Moline has already broke the record for today (see climate
section below).

SPC mesoanalysis shows tremendous energy available with SBCAPES of
5000 J/kg across southern IA with the CAPE gradient along I-80.
Bulk shear was very strong at 55-60 kt across IA with SRH of 200
m2/s2. Giant hail parameters were also in place, so this is a
volatile atmosphere to say the least!

&&

.SHORT TERM...(This evening through Monday)
Issued at 225 PM CDT Sun May 7 2023

Enhanced risk (level 3 of 5) for severe storms this evening and
overnight. Main risks are damaging winds greater than 75 mph,
giant hail (hen egg size or larger) and tornadoes. Heavy rain and
possible flash flooding are also a threat. CAM's develops
scattered supercells this evening then followed by a classic
severe bow echo sweeping across much of the cwa overnight. If this
pans out then 80+ mph winds are possible after midnight. With
numerous thunderstorms forming in this juicy airmass (PWAT's 1.50
inches) heavy rainfall and possible flash flooding are also on
the table. This is one of those times be on alert even during the
wee hours of the morning!

Monday: A cold front arrives pushing the thunderstorm threat
eventually east and southward and the severe threat has been
pushed south of the dvn cwa. It will be cooler with highs in the
upper 60s north to upper 70s south.

.LONG TERM...(Monday night through Sunday)
Issued at 225 PM CDT Sun May 7 2023

1) Warm week ahead with thunderstorm chances returning again late
   in the week into next weekend.

Tuesday through Sunday: Persistent deep trough in the Rockies
with a zonal to southwest flow aloft will keep our area in a warm
regime with daily highs in the 70s to lower 80s. Thunderstorm
chances return late in the week into next weekend.

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 110 PM CDT Sun May 7 2023

Numerous thunderstorms are expected to develop this evening,some
severe, then a line of severe storms should sweep across most of the
taf sites overnight. Damaging winds and very large hail are likely
with any of these storms. MVFR/IFR conds expected in/near TSRA.
Cold front drops southward across the area on Monday with MVFR/IFR
conds for a time behind the front.

&&

.CLIMATE...
Issued at 106 PM CDT Sun May 7 2023

Record High Temperatures for Sunday May 7, 2023

Burlington   88 1934
Cedar Rapids 98 1896
Dubuque      91 1896+
Moline       88 1965+

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.
&&

SYNOPSIS...Haase
SHORT TERM...Haase
LONG TERM...Haase
AVIATION...Haase
CLIMATE...Haase

Hazardous weather outlook, May 7, 11:48 AM CDT, 4 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
1148 AM CDT Sun May 7 2023

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-081700-
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-
1148 AM CDT Sun May 7 2023

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

The Storm Prediction Center has an Enhanced risk, or level 3 out
of 5, for severe thunderstorms this evening and overnight across
much of the outlook area. The main threats are tornadoes, damaging
winds in excess of 75 MPH and golf ball size hail or larger.
There is an additional threat for heavy rainfall and the potential
for flash flooding with a slight or level 2 risk of excessive rainfall.

The Mississippi River continues to experience flooding. Please
see the latest Flood Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

There is a chance for thunderstorms on Monday and again late next
week. However, the risk for severe storms is low.

The Mississippi River will continue to experience flooding during
the upcoming week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed this evening and overnight.

Haase

In the hours before

Local storm report, May 7, 11:42 AM CDT, 4 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1142 AM CDT SUN MAY 7 2023

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

1041 PM     HAIL             2 SW FAIRFIELD          40.98N 92.00W
05/06/2023  M1.25 INCH       JEFFERSON          IA   PUBLIC

            DELAYED REPORT.

&&

GROSS

Local storm report, May 7, 11:45 AM CDT, 4 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1145 AM CDT SUN MAY 7 2023

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

1042 PM     HAIL             2 W WELLMAN             41.47N 91.87W
05/06/2023  M1.00 INCH       WASHINGTON         IA   PUBLIC

            DELAYED REPORT.

&&

GROSS

Local storm report, May 7, 12:58 PM CDT, 3 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1258 PM CDT SUN MAY 7 2023

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

0123 AM     HAIL             WAYLAND                 41.15N 91.66W
05/07/2023  M1.25 INCH       HENRY              IA   PUBLIC

            DELAYED REPORT, PICTURE ON SOCIAL MEDIA.

&&

GROSS

Local storm report, May 7, 1:15 PM CDT, 2 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
115 PM CDT SUN MAY 7 2023

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

1247 AM     HAIL             2 W CHARLIE HEATH MEMOR 40.58N 91.94W
05/07/2023  E1.25 INCH       CLARK              MO   PUBLIC

            DELAYED REPORT, PEA TO HALF DOLLAR SIZE HAIL
            IN 3 ROUNDS OF STORMS.

&&

GROSS

Local storm report, May 7, 4:06 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
406 PM CDT SUN MAY 7 2023

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

0405 PM     HAIL             BELLE PLAINE            41.90N 92.28W
05/07/2023  M1.00 INCH       BENTON             IA   FIRE DEPT/RESCUE

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 8:14 PM CDT	Special Weather Statement	DVN	Van Buren	31 min
May 6, 8:22 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	38 min
May 6, 8:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Henry, Lee, Van Buren	40 min
May 6, 9:38 PM CDT	Severe Thunderstorm Warning	DVN	Lee	34 min
May 6, 9:53 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Lee	52 min
May 6, 10:38 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren	52 min
May 6, 10:52 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Keokuk, Louisa, Washington	38 min
May 6, 11:30 PM CDT	Special Weather Statement	DVN	Johnson	45 min
May 6, 11:38 PM CDT	Special Weather Statement	DVN	Jefferson	37 min
May 7, 12:01 AM CDT	Severe Thunderstorm Warning	DVN	Jefferson	29 min
May 7, 12:19 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Louisa, Washington	41 min
May 7, 12:34 AM CDT	Severe Thunderstorm Warning	DVN	Van Buren	41 min
May 7, 12:47 AM CDT	Severe Thunderstorm Warning	DVN	Louisa	28 min
May 7, 1:03 AM CDT	Severe Thunderstorm Warning	DVN	Jefferson	27 min
May 7, 1:08 AM CDT	Flash Flood Warning	DVN	Henry, Jefferson	3 hr
May 7, 1:14 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Van Buren	31 min
May 7, 1:34 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	26 min
May 7, 3:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton	39 min
May 7, 4:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Iowa	36 min
May 7, 4:32 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee	43 min
May 7, 4:48 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Iowa, Johnson, Linn	42 min
May 7, 4:57 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Keokuk, Washington	48 min
May 7, 5:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Des Moines, Lee	33 min
May 7, 5:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Cedar, Johnson, Louisa, Muscatine, Washington	41 min
May 7, 5:42 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	48 min
May 7, 5:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Cedar, Johnson, Louisa, Muscatine, Scott, Washington	56 min
May 7, 5:50 PM CDT	Tornado Warning Tornado observed	DVN	Cedar, Muscatine	14 min
May 7, 6:07 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	38 min
May 7, 6:25 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Louisa, Van Buren, Washington	35 min
May 7, 6:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Louisa, Muscatine, Scott	39 min
May 7, 6:41 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	49 min
May 7, 6:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Des Moines, Henry, Jefferson, Louisa	38 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2023 Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.