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 6:39AM||Sunset 5:47PM||Wednesday February 24, 2021 10:42 AM MST (17:42 UTC)||Moonrise 3:51PM||Moonset 6:20AM||Illumination 95%|
7 Day Forecast for Marine Location Near Nunn, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 241130 CCA AFDBOU
Area Forecast Discussion . CORRECTED National Weather Service Denver/Boulder CO 430 AM MST Wed Feb 24 2021
Corrected highlights to have Zone 39 in Winter Weather Advisory.
SHORT TERM. (Today and tonight) Issued at 359 AM MST Wed Feb 24 2021
Satellite pictures have some upper level cloudiness over the CWA in places, but most areas are mostly clear at this time. A cold front moved across the CWA last evening. Most of the plains have some sort of upslope component to the winds at this time. There is some Stratus cloudiness just south of the CWA in El Paso County and it is pushing into Elbert and Lincoln Counties at this time.
Models have some weak upward vertical velocity over the CWA today and tonight as an upper trough moves into western Colorado by 12Z Thursday morning. There is fairly strong west-southwesterly jet level flow in place today and most of the tonight. The low level winds have an upslope component to them through today and much of tonight. Moisture isn't expected to move into the CWA in earnest until this afternoon, and then it gets fairly deep this evening and overnight. The QPF fields show fairly decent precipitation over the foothills and adjacent plains. I added Zones 39 and 35 to the Winter Weather Advisory that is in effect from 5 PM MST time through tonight into Thursday morning at 6 AM MST. For temperatures, todays's highs are about 4-9 C colder than Tuesday's highs were.
LONG TERM. (Thursday through Tuesday) Issued at 127 AM MST Wed Feb 24 2021
Appears this weather system is just a tad slower than indicated yesterday so we'll probably have lingering light snow (less than an inch) and slick roads to contend with early Thursday morning. That snow will end from north to south during the rush hour but current advisories may need to be extended to cover that due to the slowing of the upper level trough, weak lift, and cessation of upslope. Clouds will break up with the trough axis passage, resulting in more sunshine for the afternoon hours. Temperatures will be well below normal with some fresh snow along the Front Range and deep cold pool across the forecast area.
Friday will see modest warming with strengthening downslope flow and lee troughing. Attention will turn toward the strengthening winds, as cross mountain component increases to almost 50 knots. At this time, there does not appear to be a mountain top stable layer, so looks like mainly a brute force event. That would keep the highest winds over the Front Range peaks, with more typical gusty winds spreading down the foothills and adjacent plains through the day. Mountain areas will also likely see some snow develop with an increase in mid level moisture and the strong orographics, but amounts should remain quite light with limited moisture below ~650 mb.
Mountain snowfall may see an uptick late Friday night and Saturday as another shot of moisture and cold advection arrive. This would also combine with potential for upper level support in the form of an upper level speed max.
The next upper level trough appears to then dig into the southwest U.S. Saturday night and Sunday, but this is where model consistency falls apart and confidence decreases considerably in the forecast. There could still be some upper level support given the proximity of the upper level jet and trough axis, so we can't rule out some light snow spilling out onto the plains. However, chances of measurable snow look rather low in the lower elevations considering the overall westerly downslope component still in place. Temperatures will remain below normal through the weekend.
A warmup is expected to get underway early next week, but confidence is still rather low. That's taking into consideration the potential for an ejecting trough out of the southwest, or just simply ridging if the first trough ends up being more progressive. We'll keep the consensus forecast in tact with moderating temperatures here.
AVIATION. (For the 06Z TAFS through 06Z Wednesday night) Issued at 359 AM MST Wed Feb 24 2021
Southeast winds have dominated at DIA overnight. Models have, mainly, due easterlies winds a the airport much of today, becoming north-northeasterly tonight. Models don't show low level moisture getting into the airport until around 00Z late this afternoon. Ceilings of BKN-OVC010-020 can be expected most of tonight with visibilities in the 3/4SM-2SM -SN BR range.
BOU WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory from 5 PM this afternoon to 6 AM MST Thursday for COZ035-036-039-041.
SHORT TERM . RJK LONG TERM . Barjenbruch AVIATION..,,.RJK
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|Fort Collins/Loveland - Northern Colorado Regional Airport, CO||16 mi||47 min||S 10||10.00 mi||Fair||34°F||14°F||44%||1022.8 hPa|
|Greeley, Greeley-Weld County Airport, CO||21 mi||47 min||S 9||10.00 mi||Fair||36°F||14°F||40%||1024.7 hPa|
Link to 5 minute data for KFNL
Wind History from FNL (wind in knots)
|1 day ago||SE||W||W||NW||NW||NW||W||Calm||W||E||SE||N||NE||NE||NE||N||NE||SW||Calm||N|
|2 days ago||SE||S|
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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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