Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 49, NWS Des Moines, IA

April 23, 20227 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 23, 2022, 6:31 PM CDT for 7 counties in Iowa. It was in force for 44 min. 2 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: Apr 23, 2022, 6:31 PM CDT (23:31 UTC)
Expired: Apr 23, 2022, 7:15 PM CDT
In force: 44 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.88 in
Wind: 70.0 mph

Counties Boone County, IA, Hardin County, IA, Jasper County, IA, Marshall County, IA, Polk County, IA, Story County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 38 km from the middle of the area, began a volume at 23:36 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
Apr 23, 6:38 PM CDT	TSTM WND GST 60	2 S Ames, IA	ASOS REPORT OF 60 MPH WIND GUST.
Apr 23, 7:15 PM CDT	TSTM WND GST 62	Hubbard, IA

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 2 storm reports to this severe thunderstorm warning; the first came 7 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 23, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 246 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: 1238 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

909 
WUUS53 KDMX 232331
SVRDMX
IAC015-083-099-127-153-169-181-240015-
/O.NEW.KDMX.SV.W.0049.220423T2331Z-220424T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
631 PM CDT Sat Apr 23 2022

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Polk County in central Iowa...
  Story County in central Iowa...
  Western Marshall County in central Iowa...
  Southwestern Hardin County in central Iowa...
  Northwestern Jasper County in central Iowa...
  East central Boone County in central Iowa...
  Northwestern Warren County in south central Iowa...

* Until 715 PM CDT.

* At 631 PM CDT, severe thunderstorms were located along a line
  extending from near Iowa State Center to near Huxley to Des Moines
  Int'l Airport, moving northeast at 60 mph.

  HAZARD...70 mph wind gusts and nickel size hail.

  SOURCE...Law enforcement.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Des Moines, Ames, West Des Moines, Ankeny, Johnston, Altoona,
  Norwalk, Pleasant Hill, Nevada, Bondurant, Story City, Huxley,
  Saylorville, Mitchellville, Colfax, Slater, State Center, Roland,
  Baxter and Gilbert.

This includes the following highways...
 Interstate 35 between mile markers 87 and 125.
 Interstate 80 between mile markers 132 and 156.
 Interstate 235 between mile markers 4 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4172 9316 4143 9375 4181 9364 4206 9379
      4221 9355 4221 9346 4227 9346 4239 9326
      4214 9306
TIME...MOT...LOC 2331Z 232DEG 54KT 4204 9369 4185 9358 4152 9365 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Curtis

3 follow-up statements

196 
WWUS53 KDMX 232347
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
647 PM CDT Sat Apr 23 2022

IAC015-099-153-181-232356-
/O.CAN.KDMX.SV.W.0049.000000T0000Z-220424T0015Z/
Polk IA-Jasper IA-Boone IA-Warren IA-
647 PM CDT Sat Apr 23 2022

...THE SEVERE THUNDERSTORM WARNING FOR POLK...NORTHWESTERN JASPER...
EAST CENTRAL BOONE AND NORTHWESTERN WARREN COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central Iowa.

LAT...LON 4193 9322 4186 9336 4186 9352 4214 9367
      4221 9355 4221 9346 4227 9346 4239 9326
      4214 9306
TIME...MOT...LOC 2346Z 232DEG 54KT 4215 9351 4196 9340 4163 9347 

$$

IAC083-127-169-240015-
/O.CON.KDMX.SV.W.0049.000000T0000Z-220424T0015Z/
Story IA-Marshall IA-Hardin IA-
647 PM CDT Sat Apr 23 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR STORY...NORTHWESTERN MARSHALL AND SOUTHWESTERN HARDIN COUNTIES...

At 646 PM CDT, severe thunderstorms were located along a line
extending from Roland to near Nevada to Altoona, moving northeast at
60 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Law enforcement.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Ames, Nevada, Story City, State Center, Roland, Gilbert, Maxwell,
Colo, Hubbard, Cambridge, Zearing, Collins, McCallsburg, New
Providence, Clemons, St. Anthony and Garden City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4193 9322 4186 9336 4186 9352 4214 9367
      4221 9355 4221 9346 4227 9346 4239 9326
      4214 9306
TIME...MOT...LOC 2346Z 232DEG 54KT 4215 9351 4196 9340 4163 9347 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Curtis

006 
WWUS53 KDMX 232354
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
654 PM CDT Sat Apr 23 2022

IAC083-127-169-240015-
/O.CON.KDMX.SV.W.0049.000000T0000Z-220424T0015Z/
Story IA-Marshall IA-Hardin IA-
654 PM CDT Sat Apr 23 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR EASTERN STORY...NORTHWESTERN MARSHALL AND SOUTHWESTERN HARDIN
COUNTIES...

At 653 PM CDT, severe thunderstorms were located along a line
extending from near Roland to 6 miles west of State Center to
Mitchellville, moving northeast at 60 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Law enforcement.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
State Center, Colo, Hubbard, Zearing, Collins, McCallsburg, New
Providence, Clemons, St. Anthony and Garden City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4193 9322 4188 9335 4211 9337 4221 9346
      4227 9346 4239 9326 4214 9306
TIME...MOT...LOC 2353Z 232DEG 54KT 4221 9341 4202 9330 4169 9337 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Curtis

044 
WWUS53 KDMX 240009
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
709 PM CDT Sat Apr 23 2022

IAC083-127-169-240018-
/O.EXP.KDMX.SV.W.0049.000000T0000Z-220424T0015Z/
Story IA-Marshall IA-Hardin IA-
709 PM CDT Sat Apr 23 2022

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN STORY...NORTHWESTERN
MARSHALL AND SOUTHWESTERN HARDIN COUNTIES WILL EXPIRE AT 715 PM
CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central Iowa.

LAT...LON 4193 9322 4188 9335 4211 9337 4221 9346
      4227 9346 4239 9326 4214 9306
TIME...MOT...LOC 0008Z 270DEG 54KT 4233 9321 4214 9310 4181 9317 

$$

Curtis

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 23, 3:37 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, Apr 23, 3:37 PM CDT, 2 hours 54 minutes before

Area Forecast Discussion
National Weather Service Des Moines IA
337 PM CDT Sat Apr 23 2022

.DISCUSSION.../Tonight through Saturday/
Issued at 337 PM CDT Sat Apr 23 2022

Key Messages:

-Strong winds and scattered severe storms late afternoon into the
 evening hours.
-Quiet and cooler into Sunday and early next week.
-Increasing threat of precipitation by late in the work week.

Impressive non-severe high wind event ongoing over western Iowa this
afternoon with numerous gusts of 50kts+ and sustained winds of 40
mph or more. Have had several incidents of higher profile vehicles
blown over on Interstate 80 in the west and the threat will persist
a few more hours as deep mixing of high velocities continues.  The
HWW was expanded to include another row of counties in the northwest
with a peak wind of 65 mph at EST in the past hour.  CAMS have
convective initiation with the next hour or so as cap continues to
weaken. Forward motion should be remains quick at 50kts+ given the
strong wind fields aloft with damaging winds the primary threat.
There has been some recent trends in the CAMS for a slightly higher
threat of tornadoes as a few discrete cells form and persist for a
longer period prior to becoming a linear system. Once linear, shear
vectors would be mostly be parallel with an north-south line but any
segment that could become more west-northwest to east southeast
oriented would be much more orthogonal and capable of a QLCS type
tornado. The bulk of the action is likely within the first 3
hours or so with the cold pool eventually dominating and overall
intensity dropping with mostly heavy rain and gusty winds by mid
evening onward. The activity exits to the east later overnight
with a cooler and drier airmass entering the state.

Rather strong subsidence is expected across much of the Iowa on
Sunday with mostly sunny skies central and south along breezy
conditions are expected to persist.  Some clouds do affect the north
during the day along the southern edge of the deformation area but
with little threat of precipitation.  The cool and dry conditions
are expected into early next week with the upper trof making only
slow progress into early Tuesday.  Warm advection does finally take
hold by Tuesday night and persist into Wednesday ahead of a
shortwave crossing the Rockies.  Scattered convection remains
possible into late Wednesday night/Thursday in low level moisture
axis as forcing arrives with this wave across the state. A more
robust system passes into the Midwest by the end of the period with
a better threat of precipitation and storms although plenty of time
for the situation to change between now and then.

&&

.AVIATION.../For the 18Z TAFS through 18Z Sunday afternoon/
Issued at 1245 PM CDT Sat Apr 23 2022

Strong south surface winds are expected this afternoon and evening
before some gradual weakening overnight. Otherwise, mostly VFR
ceilings this afternoon with thunderstorms developing along a
boundary by mid to late afternoon. This convection progresses east
into the evening with clearing behind. Winds veer toward the
southwest by the end of the period with mostly VFR conditions
overnight into Sunday morning.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 7 PM CDT this evening for IAZ005>007-016-017-
024>028-035>039-046>050-058>062-071>075-081>086-092>097.

High Wind Warning until 7 PM CDT this evening for IAZ004-015-023-
033-034-044-045-057-070.

&&

DISCUSSION...Cogil
AVIATION...Cogil

Hazardous weather outlook, Apr 23, 2:17 PM CDT, 4 hours 14 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
217 PM CDT Sat Apr 23 2022

IAZ005>007-016-017-024>028-035>039-046>050-058>062-071>075-
081>086-092>097-241930-
Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Humboldt-Wright-
Franklin-Butler-Bremer-Webster-Hamilton-Hardin-Grundy-Black Hawk-
Greene-Boone-Story-Marshall-Tama-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-
Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-
Davis-
217 PM CDT Sat Apr 23 2022

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A wind advisory is in effect for the area. Please refer to the
National Weather Service website at weather.gov/desmoines for
further details.

Additional thunderstorm development is expected this afternoon
with a slight risk for severe storms across much of the area
through the evening. Damaging winds will be the main threat this
afternoon and evening, but large hail could be possible with
initial storms. The overall risk for tornadoes is low but cannot
be completely ruled out.

Areas that experienced heavy rainfall on Friday will be at a
slight risk for flooding with additional rainfall today due to
the saturated soils.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Scattered thunderstorms are possible later this week but are
currently expected to remain sub-severe.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed today.

IAZ004-015-023-033-034-044-045-057-070-241930-
Emmet-Palo Alto-Pocahontas-Sac-Calhoun-Crawford-Carroll-Audubon-
Cass-
217 PM CDT Sat Apr 23 2022

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A high wind warning is in effect for the area. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

Additional thunderstorm development is expected this afternoon
with a slight risk for severe storms across much of the area
through the evening. Damaging winds will be the main threat this
afternoon and evening, but large hail could be possible with
initial storms. The overall risk for tornadoes is low but cannot
be completely ruled out.

Areas that experienced heavy rainfall on Friday will be at a
slight risk for flooding with additional rainfall today due to
the saturated soils.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Scattered thunderstorms are possible later this week but are
currently expected to remain sub-severe.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed today.

In the hours before

Local storm report, Apr 23, 5:50 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
550 PM CDT SAT APR 23 2022

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

0540 PM     TSTM WND GST     2 S MENLO               41.50N 94.40W
04/23/2022  E70 MPH          ADAIR              IA   TRAINED SPOTTER

            SPOTTER REPORT OF 60-70 MPH WIND NEAR MENLO
            AND I80.

&&

VIKEN

Local storm report, Apr 23, 5:52 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
552 PM CDT SAT APR 23 2022

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

0543 PM     TSTM WND GST     1 SW WIOTA              41.39N 94.91W
04/23/2022  E60 MPH          CASS               IA   EMERGENCY MNGR

            ESTIMATE 60MPH WINDS, ZERO VISIBILITY VIA
            EM.

&&

VIKEN

Local storm report, Apr 23, 6:08 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
608 PM CDT SAT APR 23 2022

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

0558 PM     TSTM WND GST     DEXTER                  41.52N 94.23W
04/23/2022  E70 MPH          DALLAS             IA   EMERGENCY MNGR

            70 MPH WIND GUST ESTIMATE.

&&

VIKEN

Local storm report, Apr 23, 6:13 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
613 PM CDT SAT APR 23 2022

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

0610 PM     TSTM WND GST     3 WSW PERRY             41.83N 94.16W
04/23/2022  M58 MPH          DALLAS             IA   AWOS

            AWOS REPORT OF 58 MPH.

&&

VIKEN

Local storm report, Apr 23, 6:16 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
616 PM CDT SAT APR 23 2022

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

0604 PM     TSTM WND DMG     1 WNW CALLENDER         42.37N 94.32W
04/23/2022                   WEBSTER            IA   PUBLIC

            DEBRIS ON FAIRBANKS AVE.

&&

AJ

Local storm report, Apr 23, 6:29 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
629 PM CDT SAT APR 23 2022

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

0624 PM     FUNNEL CLOUD     2 SW POLK CITY          41.75N 93.73W
04/23/2022                   POLK               IA   PUBLIC

            OBSERVED NEAR SAYLORVILLE LAKE.

&&

CAH

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 5:36 AM CDT	Severe Thunderstorm Warning	DMX	Crawford	39 min
Apr 23, 5:57 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	33 min
Apr 23, 6:54 AM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	33 min
Apr 23, 7:41 AM CDT	Special Weather Statement	DMX	Boone, Dallas, Madison	64 min
Apr 23, 8:10 AM CDT	Special Weather Statement	DMX	Hardin, Jasper, Marshall, Polk, Story	50 min
Apr 23, 8:26 AM CDT	Special Weather Statement	DMX	Franklin, Hamilton	34 min
Apr 23, 10:41 AM CDT	High Wind Warning	DMX	Audubon, Calhoun, Carroll, Cass, Crawford, Emmet and 3 more	8 hr
Apr 23, 4:55 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	35 min
Apr 23, 5:04 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Ringgold, Taylor, Union	41 min
Apr 23, 5:17 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Calhoun, Carroll, Cass, Greene and 2 more	58 min
Apr 23, 5:20 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas, Webster and 2 more	55 min
Apr 23, 5:24 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Dallas, Guthrie, Madison	36 min
Apr 23, 5:48 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Adair, Boone, Dallas, Guthrie, Madison	27 min
Apr 23, 5:56 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie, Hamilton, Humboldt and 2 more	64 min
Apr 23, 6:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Boone, Dallas, Madison, Polk, Story, Warren	38 min
Apr 23, 6:16 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Winnebago, Wright	59 min
Apr 23, 6:22 PM CDT	Tornado Warning	DMX	Polk	23 min
Apr 23, 6:22 PM CDT	Tornado Warning	DMX	Hancock, Humboldt, Kossuth, Wright	23 min
Apr 23, 6:34 PM CDT	Tornado Warning	DMX	Boone, Story	26 min
Apr 23, 6:41 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Clarke, Madison, Ringgold, Taylor and 1 more	49 min
Apr 23, 6:49 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hamilton, Hancock, Hardin, Wright	41 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2022 Every severe thunderstorm warning in 2022

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.