Marine Weather and Tides
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:13AM||Sunset 5:09PM||Friday January 22, 2021 8:05 AM MST (15:05 UTC)||Moonrise 1:22PM||Moonset 2:50AM||Illumination 68%|
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 221104 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 404 AM MST Fri Jan 22 2021
SHORT TERM. (Today and tonight) Issued at 404 AM MST Fri Jan 22 2021
Current satellite and radar data is showing some light snow falling in the high mountains along the divide, mainly north of I-70 to the Wyoming border. Zonal flow aloft is expected over the forecast area today, becoming a bit more west-southwesterly tonight. There is a piece of a jet maximum over the southern CWA this evening. There is little in the way of any synoptic scale forcing today, but tonight some upward vertical velocity is progged, more so over the western half of the CWA. The low level winds are progged to be upsloping much of today, with more normal drainage patterns expected tonight. Cross sections show pretty deep moisture over the mountains today and tonight. The plains will see mid and upper level moisture but little in the lower levels. The QPF fields have measurable snow over the mountains the first two periods. For pops, the moisture is good and there is the minor synoptic scale energy. The mountain top flow is generally southwesterly through tonight, not that great for orographic enhancement. Will go with 50-70%s in the high mountains today, and 60-90%s tonight. Zone 31 looks to get enough snowfall to warrant a highlight, so will go with a winter weather advisory there starting this evening at 00Z. For temperatures, today's highs should be similar to Thursday's readings.
LONG TERM. (Saturday through Thursday) Issued at 334 AM MST Fri Jan 22 2021
Active weather pattern will prevail this weekend and early next week across much of the country. Moisture with these system will be rung out by the mountains to the west leaving just light snow for the northern and central Colorado mountains. On Saturday, a weakening trough will move across the Great Basin and into Wyoming in the southwest flow aloft. Most of the lift associated with this trough will remain over western Colorado and Wyoming. Will have an advisory for the mountains of western Jackson and western Grand counties. A surface low forms over eastern Colorado Saturday and a cold front drops southward. Best chance for snow east of the mountains will be behind this front Saturday evening. Any snowfall is expected to be light. Cross sections show low levels stay moist late Saturday night and into Sunday. Could see flurries or freezing drizzle if this moist/saturated layer deepens. With cloudy skies in place, highs Sunday should be cool and in the 30s across northeast Colorado.
The next wave moving through the region will track across the southern Rockies late Sunday and Sunday night. Best lift and moisture should remain over southern Colorado. Will have low PoPs for this system. Again any snowfall that occurs will be light. A weak ridge will move across Colorado Monday ahead of the next system that is poised to track across the Central Rockies Monday night and Tuesday. Model generally agree this trough will move across Colorado Tuesday, but details are still fuzzy. This should bring a round of light snow to the mountains Monday night and Tuesday. Also, this looks to be the best chance for snow east of the mountains in the next 7-10 days. Limited moisture and the quick speed of this system is expected to keep snowfall on the light side.
For Wednesday and Thursday, models fall into better agreement once the upper level trough exits the region. An upper level ridge will prevail behind this exiting trough. However, the timing is about a half day off between the ECMWF and GFS. Wednesday is expected to be cool and dry with a ridge moving across the Central Rockies. Flow aloft backs to the southwest Thursday as an upper level low digs south across California once again. This southwest flow should bring warmer temperatures and dry conditions for Thursday and Friday.
AVIATION. (For the 12Z TAFS through 12Z Saturday morning) Issued at 404 AM MST Fri Jan 22 2021
Due westerly winds are blowing at DIA at this time. Models have northeasterly upslope winds a the airport by late morning continuing through mid evening. Weak normal drainage winds are expected after that. No ceiling issues are expected.
BOU WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory from 5 PM this afternoon to 11 PM MST Saturday for COZ031.
SHORT TERM . RJK LONG TERM . Meier AVIATION . RJK
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.
|Denver - Centennial Airport, CO||12 mi||73 min||N 0||10.00 mi||A Few Clouds||26°F||15°F||63%||1014.7 hPa|
|Broomfield / Jeffco, CO||16 mi||81 min||N 0||10.00 mi||A Few Clouds||25°F||14°F||63%||1013.2 hPa|
|Denver, Denver International Airport, CO||18 mi||73 min||W 4||10.00 mi||A Few Clouds||22°F||14°F||71%||1014.8 hPa|
|Erie Municipal Airport, CO||21 mi||71 min||N 0||10.00 mi||Fair||16°F||13°F||89%||1013.9 hPa|
Link to 5 minute data for KBKF
Wind History from BKF (wind in knots)
|1 day ago||Calm||N||N||N||N||NE||N||NE||NE||N||Calm||E||E||Calm||S||S||S||S||S||S||S||Calm||S||S|
|2 days ago||N||W||NW||NW||W||W||NW|
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
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. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply 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.