Marine Weather and Tide Forecast for Calhan, CO

DISCUSSION /Through Wednesday/
Issued at 111 PM MDT Wed Oct 14 2026

Water vapor satellite imagery shows the upper level low near the Four Corners at this time. It is still forecast to track northeast across Colorado, but models favor a slightly more northerly track than earlier advertised. We nudged precipitation amounts down slightly because of this track shift. Easterly low level flow continues to produce widespread low clouds and drizzle east to the Continental Divide. This easterly flow is a downslope component west of the divide and satellite imagery currently shows mostly sunny skies at this time. As the upper level low nears, ridge top winds turn more southerly, which should cut off the downslope flow. The next batch of lift and precipitation is over south central Colorado and will lift northeast, bringing rain and mountain snow late this afternoon and evening.  Then overnight as the low shifts over northeast Colorado, northwest flow (more typical) is expected to lead to orographic lift in addition to the deformation zone. Meanwhile, eastern Colorado is expected to see a lull in precipitation, except for continued drizzle. The deformation zone shifts east over northeast Colorado bringing rain showers. The heaviest rainfall amounts and best chance for rain will be over the northern part of the state. If the more northerly low trend continues, areas along and south of I-70 may see very little additional precipitation Thursday. Rain and mountain snow will end Thursday afternoon as the upper level low weakens and moves east of the area. 

The remnants of the upper level low will be northeast of the State by Thursday evening. Much drier air will move into the area leading to clearing skies during the evening. This will lead to good radiational cooling and a chilly overnight period Thursday night/Friday morning. Most locations are expected to see a frost or hard freeze therefore, we have issued a freeze watch for Thursday night and into Friday morning. We maintain a northwest flow aloft on Friday as a ridge develops to our west and a trough to our east. Surface high pressure over Colorado will lead to a sunny day with light winds and cool temperatures for Friday. Highs will be slightly below normal with readings in the mid to upper 50s.  

The ridge to the west moves over Colorado Saturday and we see ridging continue through Monday. A weak trough passes through the ridge on Sunday. There's enough moisture for clouds, but not enough for precipitation. So we may see a slight dip in temperatures Sunday with the increase in cloud cover. Highs are expected to be in the 70s Saturday through Monday, with some upper 60s possible Sunday if cloud cover persists for much of the day.
Southwest flow aloft is expected for Tuesday and Wednesday as a strengthening trough along the west coast pushes the ridge east of the region. Temperatures will continue to run above normal under this pattern with dry conditions persisting. This trough along the west coast is the next system to watch for precipitation across our area late next week. 

AVIATION /18Z TAFS through 18Z Thursday/
Issued at 111 PM MDT Wed Oct 14 2026

As an upper level trough continues to move through our area, low clouds will be persistent through tomorrow midday. There will be slight variations in the ceiling heights with the afternoon today and the morning tomorrow having relatively higher ceilings than this evening and overnight tonight. Radar and satellite are showing another round of steadier rain currently developing over the Sangre De Cristo Mountains that will move over the terminals late this afternoon and evening. These could produce visibility between 2-5 SM.

Later this evening and overnight, mist or drizzle will develop and there is a chance that fog develops at all airports. The most likely visibility will be between 1-2 SM but visibility could get as low as 1/2 SM.

Wrap around showers on the back end of the trough will move over the terminals tomorrow morning. Ceilings, however, will slowly raise throughout the day with skies scattering out around 22-00Z Thursday afternoon.

As for winds, there will be a steady easterly flow at DEN through the afternoon. A weak cyclone will develop tonight which will likely shift winds to the northeast then north. During the day tomorrow, winds will increase substantially. North winds will gust up to 30 knots with sustained speeds between 15-18 knots during the late morning hours.

BOU WATCHES/WARNINGS/ADVISORIES
Winter Weather Advisory until 6 AM MDT Thursday for COZ031-033- 034.

Freeze Watch from late Thursday night through Friday morning for COZ038>051.