Marine Weather and Tide Forecast for Calhan, CO

DISCUSSION /Through Sunday/
Issued at 1212 PM MDT Sun May 24 2026

Scattered showers dot the high country at this hour and will continue through the afternoon, with development of isolated thunderstorms as well given modest instability. This activity will struggle to hold together in its attempt to exit the foothills, encountering an only marginally unstable environment over the urban corridor and essentially none farther east. Thus, expect cells to gradually decay as they progress east through the lower elevations, with plenty of virga and some light showers being most numerous along and west of I-25.

A developing negatively tilted trough over the Desert SW will force a transition to prevailing southerly flow for Monday and consequently a modest increase in warm moist advection, enough to provide for slightly unstable conditions by the afternoon across the plains. High-based showers and a few thunderstorms will thus become more likely for the lower elevations, although rainfall amounts will be light and localized, with gusty outflows being the more common feature considering the very steep low-level lapse rates and warm surface temperatures into the mid 80's to lower 90's.

The south/southeast flow pattern is reinforced on Tuesday, allowing for greater vapor transport into the region, seeing precipitable water values climb to around 0.90". However, this will be countered by a more stable airmass and a general lack of forcing, limiting thunderstorm potential for the plains and also rainfall amounts, with generally light scattered showers expected.
The mountains will be better positioned to benefit from the pattern, with orographic lift boosting precipitation and bringing wetting rain to most of the high country, especially north of I-70. Increased cloud cover will moderate temperatures somewhat, though we should still break 80F in the lower elevations. The southerly winds will be quite pronounced over the plains in the afternoon with gusts 35-45 mph, resulting in elevated fire weather conditions for any areas that receive little to no rain.

A pronounced closed low is set to dominate the Great Basin region starting Wednesday and stalling into Thursday, feeding continued moisture into our area as precipitation chances peak Wednesday when afternoon showers and thunderstorms look to be most widespread. Coverage should dwindle some on Thursday with higher pressure in place over eastern Colorado. Friday into Saturday, the low is progged to quickly lift NE through the Intermountain West as it merges with the broader flow pattern. Warm surface temperatures will continue, but with cooling air aloft, we should see some better destabilization and thus favorable conditions for afternoon thunderstorm development across much of the region.

AVIATION /06Z TAFS through 06Z Tuesday/
Issued at 1105 PM MDT Sun May 24 2026

Winds will be drainage overnight and continue thru Mon morning.
Sct showers and a few tstms will be possible between 20z and 00Z on Mon. Most of this activity will be high based and may produce brief wind gusts from 35 to 50 mph as they move across. Winds will be erratic Mon aftn due to outflow boundaries from the showers and storms. By early Mon evening, the tstm threat will diminish with just a chc of high based showers thru 03z. Winds will be NW by early evening and then transition to drainage by 06z.

BOU WATCHES/WARNINGS/ADVISORIES
None.