Marine Weather and Tide Forecast for Calhan, CO

DISCUSSION /Through Monday/
Issued at 242 AM MDT Tue Jun 9 2026

GOES-19 satellite imagery is showing some areas of stratus across our area. In addition, radar shows some isolated strong showers and thunderstorms for our northeastern counties particularly in Weld County. Some fog is possible into the early morning for areas where winds are light given the dewpoints in the 50s and the rain that occurred on Monday afternoon and evening.

Hot and windy conditions are the main story for today and Wednesday. Given southwest flow aloft and downsloping winds, high temperatures for today will easily reach the low to mid 90s for the plains. The record high at Denver International Airport is 95 degrees F, which is within reach, but we will likely fall just shy of it. Today also brings a low risk of severe weather for the far northeastern plains, where a marginal risk is in effect (Level 1 out of 5). MLCAPE is expected to be between 500 to 1000 J/kg for these locations. The highest threats will be strong gusty winds and isolated hail of about 1 inch in diameter. Additionally, high- based showers/virga (with little to no measurable precipitation)
are possible mainly from Denver eastward this afternoon. DCAPE values could exceed 1500 J/kg. Given environmental winds of 30 to 35 kts and any additional acceleration from passing showers/thunderstorms, localized areas of wind gusts between 45 and 60 mph are possible this afternoon. A Red Flag Warning remains in effect for the plains east of I-25 from 12pm to 9pm today. No changes were made to the RFW in this forecast package. A weak cold front will move through late tonight.

Thus, Wednesday will be slightly "cooler" than Tuesday with high temperatures for the plains right around 90 degrees F. Wednesday will also be another day of critical fire weather conditions. We have issued a Fire Weather Watch for the plains east of I-25 from 12pm to 8pm. See the Fire Weather Discussion for more details.
Cross sections show a strong jet overhead with cross barrier flow and winds of about 35 kts in the 500 to 700 mb layer. Thus, even outside of the Fire Weather Watch area, winds gusts in the mountains could reach 40 to 50 mph on Wednesday afternoon. For the plains, wind gusts will be a touch lower, but the typical windy locations near I- 25 north of Fort Collins and our northern tier of counties could see wind gusts between 30 and 40 mph.

A stronger cold front is still expected to move through on Wednesday night, briefly dropping high temperatures for the plains into the upper 70s and low 80s on Thursday. By Thursday, zonal flow aloft will be in place for the area. High temperatures on Friday will be in the upper 80s to low 90s. Models continue to show that the next decent chance for any measurable precipitation could come on Saturday with a trough moving in from Canada. The trough will bring a cooldown for the area with below average temperatures becoming increasingly likely starting on Sunday and lasting into early next week.

AVIATION /06Z TAFS through 06Z Wednesday/
Issued at 1218 AM MDT Tue Jun 9 2026

Outflow easterly winds have pushed back across KDEN to start this TAF period, and with that comes the threat of patchy fog. We'll add VCFG to the TAF til about 14Z as we'll likely be on the edge of low level stratus deck, narrow T/Td spreads, and lack of a pure S-SW drainage wind.

The S-SW winds should eventually develop toward 14Z-15Z, taking any fog/stratus threat with it. Then a much drier and hotter airmass will spread in with increasing SW winds, now expected closer to 17Z at KDEN, a bit sooner at KAPA, but a good 3-4 hours later at KBJC. Wind speeds should increase to around 20-22kts with G30-32kts. We are also more concerned about virga and in this setup it won't take much to get a stronger (most likely SSW direction) outflow gust to 40-45+ kts. We have added a TEMPO to address the stronger wind potential. Winds are then expected to diminish around 02Z. A weak frontal push is expected toward 06Z Wednesday with a light wind shift or VRB winds thereafter.

FIRE WEATHER
Issued at 242 AM MDT Tue Jun 9 2026

Critical fire weather conditions are expected in some areas for today and Wednesday. The fuel status update we received on Monday shows that vegetation remains quite dry in the lower elevations.
Therefore, conditions will be favorable for rapid fire spread, mainly for areas that did not receive significant rainfall on Monday. We have kept the Red Flag Warning in place from 12pm to 9pm today for the plains east of I-25. Winds could gust between 30 and 40 mph and relative humidity will drop into the lower teens this afternoon. For Wednesday, we have issued a Fire Weather Watch from 12pm to 8pm for the plains east of I-25. Similar conditions to today are expected for Wednesday afternoon. Some spotty fire weather conditions are possible on Thursday and Friday, but will be limited in duration and scope, especially on Friday.



BOU WATCHES/WARNINGS/ADVISORIES
Red Flag Warning from noon today to 9 PM MDT this evening for COZ240>251.

Fire Weather Watch from Wednesday afternoon through Wednesday evening for COZ240>251.