Marine Weather and Tides
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
|Sunrise 7:11AM||Sunset 5:13PM||Sunday January 26, 2020 1:05 PM MST (20:05 UTC)||Moonrise 9:34AM||Moonset 8:03PM||Illumination 3%|
7 Day Forecast for Marine Location Near Holly Hills, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 261822 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 1122 AM MST Sun Jan 26 2020
UPDATE. Issued at 1122 AM MST Sun Jan 26 2020
Thin high clouds should increase this afternoon, mainly over and near the mountains, at the same time the lower clouds over the mountains break up a bit. Today's forecast looks good, with a similar wind pattern to yesterday but lighter speeds. A little west wind will spill off the mountains eventually, but most of the Denver area will remain in a pocket of lighter winds. Forecast highs look good.
Looking ahead to tomorrow, our paltry forecast may still be a bit optimistic as the low level winds will struggle to get an easterly component. For the most part it's looking like this will skip over Denver, but there's still a chance of a little snow.
SHORT TERM. (Today and tonight) Issued at 402 AM MST Sun Jan 26 2020
Last night's weak short wave and upper level speed max brought a little light snow to the northern mountains, with just a dusting of it reaching as far south as the I-70 corridor. Satellite shows this wave has passed by, but again, we're still dealing with a little mid level moisture trapped in the high country. This will bring a few more light snow showers this morning before clouds finally break a little for the afternoon and evening.
On the plains, look for another mild and dry January day with highs pushing into the mid 50s in all areas. There will be concern of a pesky but fairly narrow wave cloud along the Front Range, which may impact temps a couple degrees, but the eastern plains will certainly see plentiful sunshine. The increased heating and mixing will bring a return of northwest breezes across the plains, with speeds of 15-20 mph common. The I-25 Corridor may see a mix of diurnal easterlies and a few channels of west/northwest winds pushing off the foothills.
For tonight, moisture and lift ahead of the next upper level trough will spread across the forecast area. Light snow is expected to start by/shortly after midnight in the far northern mountains, spreading to the Front Range Mountains and Summit County toward daybreak Sunday.
LONG TERM. (Monday through Saturday) Issued at 402 AM MST Sun Jan 26 2020
The upcoming week will feature a pair of weather disturbances moving over the state. The first weather system will arrive tomorrow with snow developing in the mountains after midnight tonight and then continuing through tomorrow. The mountains will pick up a couple inches of snow for each 12 hour period as the weather system is moving over. Scattered snow showers will also continue after the upper trough passes, as the flow aloft becomes northwesterly which will favor some orographic snow shower development. The expected snow amounts are too light to justify any highlights at this time. As the upper trough moves out over northeast Colorado Monday afternoon and evening, light precipitation is expected to spread out onto the plains. With Monday afternoon temperatures in the lower to mid 40s, precipitation will probably begin as rain and then change over the light snow. No snow accumulation is expected on the plains due to the warm ground temperatures from the past couple weeks of dry and mild weather.
The second storm system of the week will move through on Thursday. This system is a bit trickier to forecast since models are showing the base of this trough digging west and then south of Colorado with the trough axis moving over forecast area. There should be plenty of dynamic forcing with the trough to produce at least light snow in the mountains and eventually out over part of the plains. Mountain areas will have the highest probability of precipitation for now. If the main part of the trough develops too far west and south of us, then very little precipitation will result over north central and northeast Colorado. The development of this system will be monitored through the first half of the week. With these two weather systems moving over the state, temperatures will be around normal.
The end of the week and through the weekend looks like a warming trend as a strong upper ridge builds over the eastern Pacific and southwestern United States. Temperatures on Saturday and Sunday look like they will be well into the 60s for the first couple days of February.
AVIATION. (For the 18Z TAFS through 18Z Monday afternoon) Issued at 1122 AM MST Sun Jan 26 2020
VFR through tonight. Winds this afternoon will be light with some variability, but mainly from the east at KDEN/KAPA. At KBJC west winds are expected to develop, with gusts to 20 knots possible this afternoon. Winds will go to S/W drainage this evening. MVFR conditions are expected to develop 12z-15z Monday with a chance of light snow showers. No accumulation is expected.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Gimmestad SHORT TERM . Barjenbruch LONG TERM . Dankers AVIATION . Gimmestad
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Buckley Air Force Base Airport, CO||11 mi||68 min||N 0||10.00 mi||Mostly Cloudy||51°F||16°F||26%||1015.2 hPa|
|Denver - Centennial Airport, CO||12 mi||73 min||SE 5||10.00 mi||Mostly Cloudy||50°F||16°F||26%||1016.3 hPa|
|Broomfield / Jeffco, CO||16 mi||76 min||ESE 5||10.00 mi||A Few Clouds||52°F||17°F||26%||1016.9 hPa|
|Denver, Denver International Airport, CO||18 mi||73 min||E 7||10.00 mi||Partly Cloudy||50°F||19°F||29%||1015.2 hPa|
|Erie Municipal Airport, CO||21 mi||66 min||N 0||10.00 mi||Fair||51°F||15°F||25%||1018.6 hPa|
|Denver Nexrad, CO||22 mi||79 min||ESE 9||10.00 mi||Partly Cloudy||50°F||19°F||30%||1017.6 hPa|
Link to 5 minute data for KBKF
Wind History from BKF (wind in knots)
|1 day ago||SW||W||N||N||NE||E||SE||SE||SE||S||S||S||S||SW||SW||SW||SW||Calm||Calm||S||S||W||NW||N|
|2 days ago||N||N||NE||E||E||SE||SE||S||S||SE||S||S||S||SE||S||SE||S||SW||E||S||S||S||SW||W |
EDIT Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map(on/off)  Help Weather Map
GEOS Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Denver/Boulder, CO (15,3,4,5)(on/off)  Help
Ad by Google
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.