Iowa, 2026

Damaging Winds in Iowa, May 17, 2026

May 17, 2026 · NWS OAX · 4 events in 4 counties and zones

Severe thunderstorms produced damaging wind gusts across southwest Iowa on May 17, 2026. On this day, an upper-level trough axis remained well to the west, but an embedded shortwave and attendant jet streak ejected from eastern Colorado into eastern Nebraska.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
4

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS OAX wrote it up.

Severe thunderstorms produced damaging wind gusts across southwest Iowa on May 17, 2026. On this day, an upper-level trough axis remained well to the west, but an embedded shortwave and attendant jet streak ejected from eastern Colorado into eastern Nebraska. At the surface, an elongated trough extended from a low in southeast Colorado through south-central Nebraska into southeast South Dakota, acting as a persistent focus for strong deep moist convergence. During the afternoon, a narrow dryline surged into central Nebraska and Kansas. East of the boundary, warm-sector dewpoints recovered into the mid-to-upper 60s, yielding a highly unstable environment with 3,000 to 4,000 J/kg of MLCAPE. Although mid-level winds were somewhat weak resulting in unimpressive 0 6 km bulk shear low-level hodographs featured ample cyclonic curvature. This provided sufficient low-level shear to keep updrafts organized and separated from downdrafts despite the weaker flow aloft.

A broken line of strong to severe thunderstorms developed across east-central Nebraska during the afternoon, pushing eastwards and growing upscale into a formidable wind-producing convective system. As the severe squall line pushed across the Missouri River into western Iowa during the mid-to-late evening hours of May 17, it maintained its intensity and continued to produce damaging straight-line winds. Personal weather stations across the region captured a series of severe gusts as the system swept eastward. Early in the evening, a 62 mph gust was measured near Rodney in Monona County, followed shortly by a 65 mph gust near Missouri Valley in Harrison County. As the storms progressed further southeast, the winds remained severe, with a 60 mph gust recorded near Oakland in Pottawattamie County and a localized peak gust of 72 mph measured southeast of Henderson in Montgomery County before the complex eventually exited the area.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Omaha, NE wrote its last area forecast discussion before the first event at May 17, 5:37 PM CST, 1 hour 11 minutes earlier. Its key messages:

  • Sunday and Monday will be days to watch very closely if you live within the Omaha area of forecast responsibility. Multiple rounds of severe thunderstorms are expected bringing the potential for large hail, damaging winds, tornadoes and flash flooding.
Area forecast discussion, May 17, 5:37 PM CST, 1 hour 11 minutes before
Area Forecast Discussion
National Weather Service Omaha/Valley NE
637 PM CDT Sun May 17 2026

.KEY MESSAGES...

- Sunday and Monday will be days to watch very closely if you
  live within the Omaha area of forecast responsibility.
  Multiple rounds of severe thunderstorms are expected bringing
  the potential for large hail, damaging winds, tornadoes and
  flash flooding.

&&

.DISCUSSION...
Issued at 142 PM CDT Sun May 17 2026

This afternoon, an elongated sfc low will be in place from SE
Colorado/SW Kansas up into the Dakotas. A dryline is set up toward
the KS/CO border and a warm front is located across central
Nebraska. Temps are currently in the 80s in the warm sector with
dewpoints in the mid-60s. SBCAPE values of 3500+ J/kg, MLCAPE values
of 3000+ J/kg and DCAPE values of 1200+ J/kg are expected. Expect
good instability through the afternoon/evening and fairly steep
lapse rates, particularly down into central and eastern Nebraska.

Portions of northeastern Nebraska in particular are showing
potential for an environment favorable for strong updrafts and
potentially some longer lived supercells. Any storms that are able
to get going and become sustained in that favorable environment
would have the best chance of developing a tornado, with some
potential to be strong. Storms are expected to develop into a line,
posing a damaging wind threat along with hail and tornadoes
possible.

Heading into Monday, a broad trough extends from the PACNW up into
eastern Nebraska/western Iowa. Another system moves in through the
day, bringing additional chances for strong to severe storms,
particularly for areas along and south of Interstate 80. There still
remain some questions as to how far north the warm front and system
get. The environment is expected to be primed with strong
instability and deep layer shear conducive for supercell development
and maintenance. With this type of set up, large hail and damaging
winds are to be expected in addition to the possibility for a few
strong and potentially long-lived tornadoes. Flash flooding will be
possible, particularly in areas that have also received a few inches
of rain over the last 48 hours.

Expect cooler temperatures for much of the week as a cold front
pushes into the region Monday. Tuesday and Wednesday bring relief
from the recent storms.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 637 PM CDT Sun May 17 2026

A line of severe thunderstorms is observed at this hour from
near KOFK to KJYR to KHJH. These storms have a history of
producing large hail, damaging winds, and tornadoes. The line
will continue progressing eastward this evening, eventually
turning into more of a damaging wind threat as it approaches
KOMA and KLNK. Have continued mentions of -TSRA at terminals
this evening, refining timing at KOMA with the line expected to
arrive by 01z per latest model guidance. Expect frequent updates
and amendments. Background winds will switch to the west
northwest once the line moves through, and remaining at 12 kts
or less after 06z. Ceilings will deteriorate to MVFR and IFR at
terminals tonight behind the line of storms and persist through
much of the TAF cycle. After 20z, will see more redevelopment of
showers and thunderstorms, with chances over 50% late in the
TAF period. These storms will once again become strong to severe
with all hazards possible.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...Flood Watch through Tuesday morning for NEZ065-066-068-078-
     088>093.
IA...None.

&&

DISCUSSION...ANW
AVIATION...Castillo
Hazardous weather outlook, May 17, 12:51 PM CST, 5 hours 57 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
151 PM CDT Sun May 17 2026

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-181900-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-Page-
Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-Stanton-
Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-Saunders-Douglas-
Sarpy-Seward-Lancaster-Cass-Otoe-Saline-Jefferson-Gage-Johnson-
Nemaha-Pawnee-Richardson-
151 PM CDT Sun May 17 2026

This Hazardous Weather Outlook is for southwest Iowa, west central
Iowa, east central Nebraska, northeast Nebraska and southeast
Nebraska.

.DAY ONE...This afternoon and tonight.

Strong to severe thunderstorms are expected to develop after 4 PM,
initially across northeast Nebraska before spreading south and east.
Large hail (2+ inches), damaging wind gusts, and a few tornadoes
(possibly strong) are the expected hazards. Heavy rain due to
several storms moving over the same area may result in some concerns
for flash flooding. A Tornado Watch has been issued for the northern
portion of the outlook area through 10 PM.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Additional strong to severe storms are forecast for Monday
afternoon, with an increased threat for large hail (2-4+ inches) and
strong tornadoes. Additional chances for heavy rainfall on top of
what has already fallen since Friday night will result in a potential
for flash flooding, particularly for portions of southeastern
Nebraska. Chances to see severe storm activity is maximized over
southeast Nebraska.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Any reports of hail, strong winds,
tornadoes, flooding or damage are greatly appreciated today and
Monday.

In the hours before

Local storm report, May 17, 6:04 PM CST, 44 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
704 PM CDT Sun May 17 2026

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

0657 PM     Hail             Wisner                  41.99N 96.91W
05/17/2026  M1.00 Inch       Cuming             NE   Emergency Mngr

&&

DAC
Local storm report, May 17, 6:21 PM CST, 27 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
721 PM CDT Sun May 17 2026

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

0716 PM     Hail             Pender                  42.11N 96.71W
05/17/2026  E1.00 Inch       Thurston           NE   Broadcast Media

&&

DAC
Local storm report, May 17, 6:32 PM CST, 16 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
732 PM CDT Sun May 17 2026

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

0714 PM     Tstm Wnd Gst     6 E Rogers              41.46N 96.80W
05/17/2026  M58 MPH          Dodge              NE   Mesonet

            UPR Station.

&&

DAC
Local storm report, May 17, 6:35 PM CST, 13 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
735 PM CDT Sun May 17 2026

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

0731 PM     Tstm Wnd Gst     Lincoln                 40.82N 96.69W
05/17/2026  E60 MPH          Lancaster          NE   Emergency Mngr

            EM estimated 60+ mph winds in Lincoln.

&&

DAC
Local storm report, May 17, 6:36 PM CST, 12 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
736 PM CDT Sun May 17 2026

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

0728 PM     Tstm Wnd Gst     3 WNW Macy              42.13N 96.42W
05/17/2026  M58 MPH          Thurston           NE   Public

            Personal Weather Station.

&&

DAC
Local storm report, May 17, 6:37 PM CST, 11 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
737 PM CDT Sun May 17 2026

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

0730 PM     Tstm Wnd Gst     2 ESE Walthill          42.14N 96.46W
05/17/2026  M58 MPH          Thurston           NE   Public

            Personal Weather Station.

&&

DAC

The radar

The Omaha radar (KOAX), 104 km away, was scanning. The volume nearest the first event began at 00:46 UTC.

Open the radar archive at this moment

Event by event

4 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Monona

When
May 17, 6:48 PM CST
Where
Monona County, 2.91 mi ENE of Ticonic
Measured
54 kt (62 mph) measured gust
Reported by
Public
Coordinates
42.190, -95.900

Personal weather station measured wind gust of 62 mph.

Thunderstorm Wind, Harrison

When
May 17, 7:33 PM CST
Where
Harrison County, 0.86 mi NW of Missouri Vly Arpt
Measured
56 kt (64 mph) measured gust
Reported by
Public
Coordinates
41.540, -95.890

Personal weather station measured wind gust of 65 mph.

Thunderstorm Wind, Pottawattamie

When
May 17, 8:16 PM CST
Where
Pottawattamie County, 1.48 mi SSW of Oakland
Measured
52 kt (60 mph) measured gust
Reported by
Public
Coordinates
41.300, -95.410

Personal weather station measured wind gust of 60 mph.

Thunderstorm Wind, Montgomery

When
May 17, 8:19 PM CST
Where
Montgomery County, 1.04 mi W of Wales
Measured
63 kt (72 mph) measured gust
Reported by
Public
Coordinates
41.120, -95.350

Personal weather station measured wind gust of 72 mph.

What these are

Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Iowa in 2026Every state in 2026This day in weather historyWarnings in Iowa, May 2026

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1337562, 1337563, 1337564, 1337565.