Marine Weather and Tide Forecast for Raymer (New Raymer), CO

DISCUSSION /Through Sunday/
Issued at 1243 AM MDT Mon Aug 3 2026

We will kick off the work week with one more day of hotter than normal temperatures before a cold front brings some relief for Tuesday and Wednesday. The Heat Advisory remains in place through 6 PM tonight along the I-25 corridor and Weld County. With poor overnight recoveries (much of the lower elevations remain in the 70s and 80s as of 230 AM), it won't take long for temperatures to heat back up to uncomfortable values. Of course, there is the possibility that the cold front picks up its pace and arrives sooner than expected, which would prevent temperatures from heating to the current forecast highs. Considering temperatures are a few degrees warmer tonight compared to this time yesterday, and most locations hit the mid 90s by early afternoon on Sunday, confidence remains fairly high that most locations will reach the triple digits before the front arrives, with highest confidence for locations from Fort Collins and Greeley southward across metro Denver. While most people will be happy to see a few days of relief from the heat, we are expecting smoke concentrations to increase with the approaching airmass from fires outside our region.

Precipitation chances will remain fairly low today, with the general expectation being that high-based showers will develop early afternoon across the higher elevations and bring gusty outflow winds and microburst potential as they pass by. DCAPE values will range from 1500-2000 J/kg, which would make for potential for an isolated severe gust, but expecting 35-45 mph gusts with the majority of what develops. If any precipitation does manage to make it to the ground, it is expected to remain very light (a few hundredths). Winds are expected to become gusty with the frontal passage that will likely see some localized elevated to near-critical fire weather conditions until relative humidity has time to improve behind the front. There is a slight chance that a few thunderstorms develop along the front that could lead to some dry lightning concerns as well since little precipitation is expected. Overnight lows tonight are expected to be about 10-15 degrees cooler than Sunday night across the lower elevations.

On Tuesday, northern Colorado will sit on the southern edge of a 40 kt 500 mb jet that will increase winds across the higher elevations. While the lower elevations will see much cooler temperatures compared to the past few days, as 700 mb temperatures cool by about 10C over the plains, there will be far less cooling across the mountain valleys (700 mb temps only cool by a few degrees C). Afternoon highs will struggle to get out of the 70s across the lower elevations, where North and Middle park will warm into the mid 80s. With the increasing winds expected across our mountain valleys coinciding with relative humidities in the mid- teens, we are expecting elevated to critical fire weather conditions to develop in North and Middle Park in the afternoon.
The jet is expected to drop slightly southward on Wednesday that will keep critical fire weather concerns in place for the higher elevations once again, where relative humidities are expected to drop into the single-digits.

Precipitation chances will remain limited through the week, with the best chances for any accumulations expected over the Central Mountains on Tuesday afternoon, and our northeastern corner on Wednesday. By Thursday, the ridge is expected to rebuild over the western CONUS and temperatures are expected to gradually increase each day until they approach the triple-digits again by next weekend.

AVIATION /12Z TAFS through 12Z Tuesday/
Issued at 530 AM MDT Mon Aug 3 2026

There are three main topics to discuss for potential impacts across the Denver TAF sites this TAF period. The first will be with the potential for high-based virga showers developing over the higher elevations by early afternoon and moving eastward over the TAF sites by the 19/20Z time frame. The latest trend in guidance has moved closer to the 20Z start time. DCAPE values are expected to be fairly impressive (1500-2000 J/kg), and with little moisture expected, the main concern will be with strong gusty outflows/microbursts producing gusts between 35-45 kts as they pass by. Timing for greatest potential will be between 20Z to 0Z. The next concern is with the arrival of a cold front. There is still some uncertainty with its exact arrival time, but gusty northerly winds are expected beginning around 22-24Z for KDEN/KBJC followed by KAPA about an hour after. The initial northerly push is expected to bring 20-25 kt northerly winds, with winds expected to increase by another 10-15 kts by 3/4Z. While there isn't a lot of moisture expected behind the front, there will be low potential for an isolated thunderstorm to develop with the frontal passage. Probabilities aren't high enough to add in the TAF at this point, but there is a nonzero chance that we see something develop outside of the current PROB30. With north/northeasterly flow expected behind the front, we could see a few hours of ceilings drop to around BKN040-050 late tonight (around 6/7Z), before gradually lifting early Tuesday morning.

Finally, smoke concentrations are expected to intensify significantly behind the front that will likely bring visibility concerns through the rest of the TAF period. Depending on the exact timing of the front, there could be slant-range visibility concerns as early as sunset tonight, but the greater concentrations aren't expected until 3/4Z tonight.

BOU WATCHES/WARNINGS/ADVISORIES
Heat Advisory until 6 PM MDT this evening for COZ038>043.