Marine Weather and Tides
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 6:09AM||Sunset 7:45PM||Thursday April 22, 2021 9:06 PM MDT (03:06 UTC)||Moonrise 2:34PM||Moonset 3:59AM||Illumination 85%|
7 Day Forecast for Marine Location Near Deer Trail, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 230158 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 758 PM MDT Thu Apr 22 2021
UPDATE. Issued at 754 PM MDT Thu Apr 22 2021
Some areas of light snowfall are ongoing in the high country, and some isolated showers are making it east out over the adjacent plains but producing only light rain and virga. We made some minor adjustments to PoP to match observed precipitation, mainly in the Front Range Mountains along the Continental Divide where there was a few hours of moderate snowfall in the late afternoon and early evening. Showers are already rapidly diminishing for the evening behind the exiting shortwave. Expect partly cloudy skies overnight ahead of the next shortwave, which is currently advancing in to the Desert Southwest. It still looks like lows tonight will be slightly warmer than those last night, in the upper 20s and lower 30s F on the plains and upper teens to lower 20s F in the mountains. The forecast is on track with only minor adjustments this evening.
SHORT TERM. (This evening through Friday) Issued at 240 PM MDT Thu Apr 22 2021
Area radars have some light rain showers now getting over the western plains. There are some snow showers in the mountains and foothills. The convection is moving due easterly. Can't find any lightning at this time.
Models show an upper level trough to move slowly eastward across the CWA tonight and Friday morning. There is north-northwesterly flow aloft in place over the CWA by Friday afternoon. There is upward vertical velocity progged for the CWA on the QG Omega fields later tonight into early Friday afternoon, then downward velocity moves in. The low level winds are progged to be normal diurnal trends tonight an Friday.
Cross sections indicate some moisture to stick around overnight, with decent moisture expected on Friday. There is limited CAPE progged on Friday as well, covering most of the CWA. For pops, will go with 10-40%s for the mountains, foothills and adjacent plains through about mid evening. Will go with "chance"s for the plains on Friday and "likely"s in the mountains and foothills. For temperatures, Friday's highs should be 1-4 C warmer than this afternoon's readings.
LONG TERM. (Friday night through Thursday) Issued at 130 PM MDT Thu Apr 22 2021
On Friday evening, a weak disturbance in the northwest flow will be moving across far Northern Colorado. Current forecast has a slight chance of showers over northern sections in this looks fine as the trof passes by.
On Saturday, there will be weak ridging of high pressure across Colorado as the flow aloft shifts back more westerly. Expect the warmup to continue as 700mb temperatures rise to close to +4c at Denver with readings across the plains rising into the 60s. There could be a few showers in the mountains late Saturday with a bit of moisture and marginal instability.
For Sunday, the flow aloft will shift to the southwest as the Pacific disturbance moves inland across the west coast. Even warmer yet as 700mb temperatures jumps to close to +9c and readings another 10 degrees warmer. The airmass will be a bit drier with the southwest flow so no pops needed. Monday will be another warm day as an approaching system moves into the Great Basin. Any showers in the mountains will likely hold off until Monday evening.
Bigger changes in store from Monday night through early Wednesday the Western trof moves across Colorado with moderate QG ascent, much colder temperatures and a cold front with a good upslope component along the Front Range. There are some timing differences between the GFS and European with the GFS still the most progressive model while the European is a bit slower. Still forecast in good shape with the trend for cooler conditions and a return to rain and snow showers.
AVIATION. (For the 00Z TAFS through 00Z Friday evening) Issued at 754 PM MDT Thu Apr 22 2021
Expect VFR conditions to persist overnight and possibly through the TAF period. Light showers should be in the vicinity of the terminals until around 03Z, then rapidly diminish this evening behind the exiting shortwave. Skies should remain scattered overnight and Friday, then mid and upper level cloudiness increases again in the afternoon with more light showers or even isolated thunderstorms possible in the vicinity of the terminals by around 20Z as the next weak shortwave moves over Colorado. They may be periods of MVFR conditions with passing showers or storms Friday afternoon and evening.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Direnzo SHORT TERM . RJK LONG TERM . Entrekin AVIATION . Direnzo
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