Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 45, NWS Des Moines, IA

April 23, 20225 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 23, 2022, 5:48 PM CDT for 5 counties in Iowa. It was in force for 27 min. 1 report 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, 5:48 PM CDT (22:48 UTC)
Expired: Apr 23, 2022, 6:15 PM CDT
In force: 27 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Adair County, IA, Boone County, IA, Dallas County, IA, Guthrie County, IA, Madison County, IA

The radar

The Des Moines radar (KDMX), 43 km from the middle of the area, began a volume at 22:50 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, 5:58 PM CDT	TSTM WND GST 70	Dexter, IA	70 MPH WIND GUST ESTIMATE.

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 10 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

Omaha, NE (KOAX), launched 12:00Z, 10.8 hours before the alert went out and 187 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: 12 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 1065 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 292 m²/s²
0-3 km storm-relative helicity: 348 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

439 
WUUS53 KDMX 232248
SVRDMX
IAC001-015-049-077-121-232315-
/O.NEW.KDMX.SV.W.0045.220423T2248Z-220423T2315Z/

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

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Northwestern Madison County in south central Iowa...
  Southeastern Guthrie County in west central Iowa...
  South central Boone County in central Iowa...
  Dallas County in central Iowa...
  Eastern Adair County in southwestern Iowa...

* Until 615 PM CDT.

* At 547 PM CDT, severe thunderstorms were located along a line
  extending from near Panora to near Stuart to 6 miles northeast of
  Green Valley Lake, moving northeast at 60 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Law enforcement.

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

* Locations impacted include...
  West Des Moines, Urbandale, Clive, Waukee, Grimes, Perry,
  Winterset, Adel, Stuart, Dallas Center, Earlham, Granger, Panora,
  De Soto, Woodward, Van Meter, Redfield, Dexter, Diamondhead Lake
  and Minburn.

This includes Interstate 80 between mile markers 93 and 120.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

 
&&

LAT...LON 4144 9430 4164 9441 4198 9396 4180 9382
      4141 9381 4116 9427 4116 9430
TIME...MOT...LOC 2247Z 226DEG 53KT 4165 9436 4148 9426 4116 9429 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Curtis

1 follow-up statement

873 
WWUS53 KDMX 232258
SVSDMX

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

IAC001-232308-
/O.CAN.KDMX.SV.W.0045.000000T0000Z-220423T2315Z/
Adair IA-
558 PM CDT Sat Apr 23 2022

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ADAIR COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central, south central and west central Iowa.

LAT...LON 4150 9421 4160 9423 4168 9434 4198 9396
      4180 9382 4141 9381 4120 9420
TIME...MOT...LOC 2258Z 270DEG 53KT 4173 9421 4156 9411 4124 9414 

$$

IAC015-049-077-121-232315-
/O.CON.KDMX.SV.W.0045.000000T0000Z-220423T2315Z/
Madison IA-Guthrie IA-Boone IA-Dallas IA-
558 PM CDT Sat Apr 23 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHWESTERN MADISON...EAST CENTRAL GUTHRIE...SOUTH CENTRAL BOONE
AND DALLAS COUNTIES...

At 558 PM CDT, severe thunderstorms were located along a line
extending from 8 miles east of Panora to near Earlham to 9 miles
southwest of Winterset, moving east 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...
West Des Moines, Urbandale, Clive, Waukee, Grimes, Perry, Winterset,
Adel, Dallas Center, Earlham, Granger, De Soto, Woodward, Van Meter,
Redfield, Minburn, Linden, Bouton, Macksburg and Badger Creek State
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4150 9421 4160 9423 4168 9434 4198 9396
      4180 9382 4141 9381 4120 9420
TIME...MOT...LOC 2258Z 270DEG 53KT 4173 9421 4156 9411 4124 9414 

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

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 11 minutes earlier.

Area forecast discussion, Apr 23, 3:37 PM CDT, 2 hours 11 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, 3 hours 31 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, 11:51 AM CDT, 5 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1151 AM CDT SAT APR 23 2022

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

1115 AM     NON-TSTM WND DMG 1 SW CASEY              41.50N 94.54W
04/23/2022                   ADAIR              IA   BROADCAST MEDIA

            VEHICLE TIPPED ON SIDE BY HIGH WINDS VIA
            BROADCAST MEDIA.

&&

AJ

Local storm report, Apr 23, 12:40 PM CDT, 5 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1240 PM CDT SAT APR 23 2022

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

1235 PM     NON-TSTM WND GST 3 WSW GLIDDEN           42.05N 94.79W
04/23/2022  M59 MPH          CARROLL            IA   AWOS

            CARROLL, IA REPORT OF 59 MPH WIND GUST VIA
            NWSCHAT BOT.

&&

VIKEN

Local storm report, Apr 23, 1:05 PM CDT, 4 hours 43 minutes before

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

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

1257 PM     NON-TSTM WND DMG 2 W MURRAY              41.04N 93.98W
04/23/2022                   CLARKE             IA   TRAINED SPOTTER

            REPORT OF ROOF DAMAGE AND A STEEL PLATE
            BEING LIFTED 20 YARDS AND PACKED INTO
            GROUND. PERSONAL WEATHER STATION REPORTED 62
            MPH WIND GUST FROM SSW.

&&

VIKEN

Local storm report, Apr 23, 4:04 PM CDT, 1 hour 44 minutes before

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

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

0213 PM     NON-TSTM WND GST 2 WNW GRUVER            43.41N 94.75W
04/23/2022  M62 MPH          EMMET              IA   ASOS

            PEAK WIND GUST REPORT VIA BOT.

&&

VIKEN

Local storm report, Apr 23, 4:06 PM CDT, 1 hour 42 minutes before

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

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

0253 PM     NON-TSTM WND GST 2 WNW GRUVER            43.41N 94.75W
04/23/2022  M58 MPH          EMMET              IA   ASOS

            PEAK WIND GUST REPORT VIA BOT.

&&

VIKEN

Local storm report, Apr 23, 5:48 PM CDT, 0 minutes before

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

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

0545 PM     TSTM WND GST     STUART                  41.50N 94.32W
04/23/2022  E70 MPH          ADAIR              IA   FIRE DEPT/RESCUE

            STUART FIRE REPORT OF 60-70 MPH WIND GUSTS
            WITH EXTREME HEAVY RAINFALL AND PEA-SIZED
            HAIL.

&&

VIKEN

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, 5:56 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, 6:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Boone, Hardin, Jasper, Marshall, Polk, Story and 1 more	44 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.