textproduct: Des Moines

KEY MESSAGES

- A few showers and non-severe thunderstorms possible on Tuesday with more widespread activity Tuesday night.

- Seasonably cool much of the week.

- More Thunderstorms chances over the weekend with warmer and more humid conditions to follow.

SHORT TERM /THROUGH TUESDAY/

Issued at 229 PM CDT Mon Jun 22 2026

Cumulus continues to develop across the state this afternoon. Some vertical growth has been occurring as suggested by satellite imagery and that is also seen in proximity sounding profiles where there is potential for 5-6 kft of vertical depth of the cumulus. Not expecting this to translate into showers and at this point, no ice has been detected in the cloud tops. Otherwise, the state is under the influence of weak high pressure ridging, which has brought the light winds to the state.

For tonight, a short wave will move across the Dakotas and will enter far northwest Minnesota by Tuesday morning. A complex of storms is expected to occur across that region over that region. Another complex of storms is expected to develop over western South Dakota and Nebraska and eventually follow the Corfidi vectors southeast along the developing instability axis. There remains a low chances some precipitation may reach far southwest Iowa. Additional showers and non-severe storms may move over far northern Iowa on Tuesday.

LONG TERM /TUESDAY NIGHT THROUGH MONDAY/

Issued at 229 PM CDT Mon Jun 22 2026

More widespread activity is expected Tuesday night as a boundary moves across Iowa. The overall instability remains weak and lapse rates mostly below 6 C/km, therefore, again not expecting any severe weather.

The upper level flow pattern will remain mostly zonal/westerly much of this week before an upper closed low descends into the western CONUS while a sub-tropical highs forms across the southeast CONUS. This setup will default southwest flow over Iowa initially. That flow will become progressively steeper as the high pushes westward towards the lower Mississippi Valley. This will result in seasonably cool conditions much of the work week followed by warmer and more humid conditions by late this weekend and into early next week. There will be a few chances for showers and storms with weak impulse passage Friday then a greater chances with the main warm advection arrival Saturday night/Sunday.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/

Issued at 604 PM CDT Mon Jun 22 2026

VFR conditions are expected at all terminals this TAF period. Overnight, there is a potential for thin pockets of patchy fog but VIS is expected to remain VFR. Through the day tomorrow, light winds will take on a southerly to southwesterly direction remaining at or below 10kts across Iowa. At MCW, there is a low (<20%) chance for a passing shower between 20z and 00z which will be monitored with future issuances.

DMX WATCHES/WARNINGS/ADVISORIES

None.