Tornado Warning 22, NWS Des Moines, IA

095 
WWUS53 KDMX 172324
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
624 PM CDT Sun Aug 17 2025

IAC081-189-180000-
/O.CON.KDMX.TO.W.0022.000000T0000Z-250818T0000Z/
Hancock IA-Winnebago IA-
624 PM CDT Sun Aug 17 2025

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR NORTH
CENTRAL HANCOCK AND SOUTHEASTERN WINNEBAGO COUNTIES...

At 623 PM CDT, a confirmed tornado was located 5 miles northeast of
Crystal Lake, or 5 miles northwest of Forest City, moving northeast
at 10 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Weather spotters confirmed a narrow tornado touched down 
         briefly about 5 miles west of Forest City and may have 
         dissipated, however conditions remain favorable for 
         additional development.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Forest City, Thompson, and Leland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4324 9375 4327 9379 4339 9376 4336 9360
      4324 9366
TIME...MOT...LOC 2323Z 208DEG 7KT 4329 9374 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Lee

193 
WWUS53 KDMX 172336
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
636 PM CDT Sun Aug 17 2025

IAC081-172345-
/O.CAN.KDMX.TO.W.0022.000000T0000Z-250818T0000Z/
Hancock IA-
636 PM CDT Sun Aug 17 2025

...THE TORNADO WARNING FOR NORTH CENTRAL HANCOCK COUNTY IS
CANCELLED...

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

LAT...LON 4327 9375 4330 9377 4339 9374 4336 9360
      4326 9365
TIME...MOT...LOC 2335Z 218DEG 5KT 4328 9372 

$$

IAC189-180000-
/O.CON.KDMX.TO.W.0022.000000T0000Z-250818T0000Z/
Winnebago IA-
636 PM CDT Sun Aug 17 2025

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
SOUTHEASTERN WINNEBAGO COUNTY...

At 635 PM CDT, a severe thunderstorm capable of producing a tornado 
was located 2 miles west northwest of Forest City, moving northeast 
at 5 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Forest City and Leland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4327 9375 4330 9377 4339 9374 4336 9360
      4326 9365
TIME...MOT...LOC 2335Z 218DEG 5KT 4328 9372 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Lee

613 
WWUS53 KDMX 172348
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
648 PM CDT Sun Aug 17 2025

IAC189-180000-
/O.CON.KDMX.TO.W.0022.000000T0000Z-250818T0000Z/
Winnebago IA-
648 PM CDT Sun Aug 17 2025

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR SOUTH
CENTRAL WINNEBAGO COUNTY...

At 647 PM CDT, a severe thunderstorm capable of producing a tornado 
3 miles northwest of Forest City, moving northeast at 10 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Forest City and Leland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4327 9374 4331 9375 4337 9372 4335 9361
      4327 9365
TIME...MOT...LOC 2347Z 208DEG 7KT 4330 9371 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Lee

930 
WWUS53 KDMX 172358
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
658 PM CDT Sun Aug 17 2025

IAC189-180008-
/O.EXP.KDMX.TO.W.0022.000000T0000Z-250818T0000Z/
Winnebago IA-
658 PM CDT Sun Aug 17 2025

...THE TORNADO WARNING FOR SOUTH CENTRAL WINNEBAGO COUNTY WILL EXPIRE
AT 700 PM CDT...

The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire. However, the 
environment does remain favorable for possible additional funnel 
clouds.

LAT...LON 4327 9374 4331 9375 4337 9372 4335 9361
      4327 9365
TIME...MOT...LOC 2358Z 208DEG 7KT 4332 9370 

$$

Lee

Area Forecast Discussion
National Weather Service Des Moines IA
232 PM CDT Sun Aug 17 2025

.KEY MESSAGES...

- Muggy conditions into Monday, then more comfortable in the
  low to mid 80s mid to late week.

- Thunderstorms across northern Iowa this evening and overnight,
  becoming scattered across much of Iowa on Monday. Severe
  chances are low, but a few stronger storms may produce gusty
  winds or hail.

&&

.DISCUSSION...
Issued at 232 PM CDT Sun Aug 17 2025

Convection early this morning largely remain north of the area aside
from a few isolated thunderstorms that crept into northern
Iowa. These have dissipated this afternoon, but with the warm
front a little further south the temperatures across northern
Iowa have remained in the low 80s. Into central and southern
Iowa temperatures have again soared into the upper 80s to low
90s with dewpoints in the mid to upper 70s. Similar temperatures
are expected on Monday, however there is some uncertainty how
much lingering convection (discussed next) will impact highs.
Right now it appears there will be a lull in convection from
late morning through the afternoon, allowing for plenty of
warming. Should showers hang around longer, temperatures will
likely be several degrees cooler than currently forecast.

Next up are convective trends. Right now the warm front is draped
across north central Iowa roughly near the highway 20 corridor. As
this lifts north there's a chance for isolated convection to develop
on the boundary, aided by more than sufficient instability (3000+
J/kg MLCAPE). Shear remains the limiting factor at under 30 kts and
should prevent more robust storm organization this afternoon and
evening.

Later tonight the wave with ongoing convection across South Dakota
slides into northwest Iowa. Initial convection is expected to be the
most robust with gusty wind the primary hazard. This line pushes
east through the overnight across northern Iowa as a secondary low
lifts into the area out of Nebraska and merges with the line. This
wave will progress across Iowa through Monday morning, diminishing
in strength through the morning as support from the low level
jet tapers off. By afternoon diurnal heating is expected to
reignite convection along the boundary. Right now this placement
looks to be across southeast Iowa, however placement could
shift towards central Iowa depending on haw quickly the boundary
progresses.

Temperatures cool behind the wave with highs in the low 80s
middle to end of the week. It's also quiet with the next chance
for precipitation not arriving until next weekend.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 1237 PM CDT Sun Aug 17 2025

Morning convection has tapered of across northern Iowa, though
scattered cloud cover remains in place. VFR conditions are
expected to last through the afternoon and much of the evening.
Late tonight storms move into northwest Iowa, expanding south
and east through Monday morning. Visibility and ceiling
reductions are likely within thunderstorms, in addition to gusty
winds. Thunderstorms are expected to be strongest in northwest
Iowa where a few severe storms may occur. As the line of storms
moves east on Monday morning convection is expected to become
more scattered in nature, eventually tapering off late morning.
Additional redevelopment is possible Monday afternoon beyond the
current period.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION...Hagenhoff
AVIATION...Hagenhoff

Hazardous Weather Outlook
National Weather Service Des Moines IA
240 PM CDT Sun Aug 17 2025

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-181945-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
240 PM CDT Sun Aug 17 2025

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Thunderstorm chances this evening into the overnight hours,
beginning in northern Iowa then spreading south and east through
the night. A few strong storms are possible, with gusty winds
being the main concern.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Intermittent storm chances continue through Monday, some of which
may be strong with gusty winds and hail.

Heat continues on Monday with heat indices over 100 degrees
possible in southern Iowa.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight into Monday.

Hagenhoff