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 6:31AM||Sunset 5:50PM||Sunday February 28, 2021 8:32 PM MST (03:32 UTC)||Moonrise 8:35PM||Moonset 8:37AM||Illumination 94%|
7 Day Forecast for Marine Location Near Raymer (New Raymer), COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 010250 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 750 PM MST Sun Feb 28 2021
UPDATE. Issued at 746 PM MST Sun Feb 28 2021
The upper trough continues its slow advance over the Rockies and northeast Colorado is now behind the trough axis. Skies are mostly clear, except for a few clouds around some of the high peaks of the Divide, and should remain so overnight with light subsidence aloft. Continue to expect clear, dry and warming conditions tomorrow. The forecast is on track without changes this evening.
SHORT TERM. (This evening through Monday) Issued at 239 PM MST Sun Feb 28 2021
The current airmass is cool and dry but fairly unstable, so we still have quite a bit of shallow convection west of the Front Range, and a few little cumulus clouds further east. The current batch of clouds will diminish with the loss of heating this evening. There was an earlier patch upstream in the models and the real world but there's just a little of it left with clouds mainly limited to over the mountains in southwest Wyoming. This could keep some clouds over Grand and Summit counties during the night, but it still looks like it shouldn't be enough to hold the temperatures up much. It may well wind up just being some little clouds clinging to the ridges. Even that should dissipate Monday morning.
Elsewhere no changes are needed to the forecast as the remaining winds will diminish this evening. The current forecast has lows near the colder GFS MOS guidance which looks good and highs near the guidance about 10-15 degrees warmer on Monday.
LONG TERM. (Monday night through Sunday) Issued at 239 PM MST Sun Feb 28 2021
An upper ridge over the area Monday evening will slowly move southeast, with a good surface pressure gradient in place along the foothills. With very light winds aloft, even reverse profile in the evening, should see gusty west winds east of the divide down the foothills as a mountain wave sets up. Luckily mountain top winds are quite light, so the enhanced winds that are produced will only be around 35 mph. This will keep temperatures moderated overnight, with readings into the upper 20s along the foothills and western urban corridor.
Tuesday and Wednesday will see a dry and warming pattern as flow aloft turns more westerly. Temperatures will warm about 5 to 10 degrees, the most over the plains due to downsloping where readings will be near 60, 10 degrees above climatology. Slightly stronger winds on Tuesday due to a weak dry front into the northeastern plains may increase fire weather concerns briefly Tuesday afternoon. Winds will be weaker on Wednesday.
Models are starting to display better congruency for Thursday. All three now bring the center of the low somewhere over Colorado, much further north than 24 hours ago, with the GFS now the slowest solution. Either way, the further north solution will mean a better chance for precipitation for more of the forecast area. Temperatures still look mild however, so snow levels will likely only be down to 6k-7k feet, leaving rain across the plains.
The upper low will quickly push east by Friday morning, with ridging building in. There may be still some showers over the southeastern part of the forecast area in the morning, but clear skies becoming widespread quickly. Models agree that ridging will last through at least Saturday afternoon, with solutions diverging after that. Will keep Saturday dry and warm, with a chance of snow for the mountains moving in Sunday.
AVIATION. (For the 00Z TAFS through 00Z Monday evening) Issued at 746 PM MST Sun Feb 28 2021
Expect VFR conditions at all terminals through the TAF period, with mostly clear skies and no precipitation. Light winds will persist through the evening and turn to drainage overnight. Expect light SE winds again tomorrow and drainage winds again tomorrow night.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Direnzo SHORT TERM . Gimmestad LONG TERM . Kriederman AVIATION . Direnzo
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|Greeley, Greeley-Weld County Airport, CO||37 mi||36 min||S 3||10.00 mi||Fair||26°F||6°F||42%||1024 hPa|
Link to 5 minute data for KGXY
Wind History from GXY (wind in knots)
|1 day ago||N||N||N||SE||SE||NW||NW||Calm||SE||S||Calm||NE||W||W||N||N||N|
|2 days ago||Calm||NE||Calm||Calm||S||Calm||SW||SW||Calm||NW||W||NE||SW||S||Calm||W|
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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