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 7:00AM||Sunset 4:36PM||Monday November 30, 2020 9:44 PM MST (04:44 UTC)||Moonrise 5:57PM||Moonset 8:13AM||Illumination 99%|
7 Day Forecast for Marine Location Near Lochbuie, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 010414 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 914 PM MST Mon Nov 30 2020
UPDATE. Issued at 914 PM MST Mon Nov 30 2020
Cloudiness is increasing across the area as the upper trough continues its approach from the northwest. The cold front is still somewhat poorly defined but appears to be moving through southern Idaho, northwest Wyoming, and southern Montana at this time due to a general wind shift and increase in surface humidity in this area. This keeps it on pace to push through northeast Colorado tomorrow morning. Surface winds will increase behind the front, with strong northerlies sustained around 25 mph with gusts up to 40 mph. The forecast for a chance of light snow tomorrow continues to look sound as the system continues to lack moisture. Mountains should see more widespread light snow and less virga due to the relatively dry low levels. Expect high end accumulations of only up to a few inches in the high country, with only a dusting to 1 inch in lower elevations. Overnight lows in the foothills may be slightly warmer than expected tonight due to downsloping westerlies and some developing mountain wave clouds. Otherwise, the forecast is on track without significant changes this evening.
SHORT TERM. (This evening through Tuesday) Issued at 205 PM MST Mon Nov 30 2020
Surface high pressure system that brought the mild and dry conditions today will continue to move southeast and away from Colorado. An upper level trough over the Northern Rockies will dive southeast tonight and track across the Central Rockies. A cold front associated with this system will push south across the state Tuesday morning. Northerly winds to 40 mph will prevail behind the front. Moisture will be limited with this system. However, orographic lift, QG lift, and lapse rates of 6-8 c/km is expected to produce snow showers Tuesday. Light snow may enter north central Colorado late tonight. Snowfall amounts are expected to be light with up to 4 inches in the mountains where orographic lift is expected to wring out the most moisture. For the lower elevation, snowfall is expected to be short lived and less than an inch. Can't rule out a few slick spots late in the afternoon as the sun sets.
It will be mild ahead of this system tonight, but cold air advection will keep temperatures from warming much on Tuesday. Temperatures could fall Tuesday afternoon due to the cold advection.
LONG TERM. (Tuesday night through Monday) Issued at 205 PM MST Mon Nov 30 2020
Snow shower activity will wane a bit Tuesday night as the best synoptic scale lift departs the area. There still will be enough moisture across the higher elevations for continued light snow showers through the night, with only a few isolated snow showers expected over the plains. Only minor accumulations are expected with up to an inch or two on the higher peaks and less than half an inch for the plains.
Another surge of cold air arrives on Wednesday which will help force the trough axis further west. Most guidance suggests a closed 500mb low over Oklahoma, with the trough axis stretching essentially due west towards the Four Corners region. There's still disagreement in where the best synoptic forcing will end up, with solutions varying from over Western Colorado to the far east Plains. Either way, the general pattern would suggest an easterly component to the northerly flow aloft with a pocket of moisture hanging around the area which would favor some light upslope flow. Some near surface dryness may limit coverage of snow showers during the day over the plains, but light snow showers should continue through the day across most of the forecast area on Wednesday, with the best chances across portions of the Front Range/Foothills and Palmer Divide. Additional accumulations of less than an inch in the plains to a couple inches over the high mountains are expected. It will also be quite cold across the area during the afternoon, with highs in most places unlikely to hit 30F.
The pattern starts to become much quieter on Thursday as the upper trough slowly sinks south. Cloud cover should slowly erode through the day as moisture decreases, and highs will be about 5F warmer than on Wednesday across the area. A continued warming trend into the weekend looks likely as a Rex Block sets up over the West Coast, with dry but mild northerly flow aloft. The biggest question during that time period will be how warm temperatures get each afternoon, which will depend on the strength of the ridge to our northwest and the cutoff upper low to the southwest of the state. Blended forecast guidance has highs in the low 50s most days, which seems like a good starting point for the time being.
AVIATION. (For the 06Z TAFS through 06Z Tuesday night) Issued at 914 PM MST Mon Nov 30 2020
Skies are mostly clear but cloudiness will increase overnight as an upper trough approaches from the northwest. The system will push a cold front through northeast Colorado tomorrow. Westerly and southwesterly winds overnight will turn northwesterly before the front in the early morning, and then northerly behind the front around 16Z. Winds will increase behind the front and gusts to 30 kts are expected. Skies will be broken to overcast across the area with bases lowered beneath 6 kft through the afternoon and evening. There will be a chance of light snow across the Denver area through the afternoon and evening, but less than an inch of accumulation is expected at this time. Snowfall may reduce visibility below thresholds for a few hours.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Direnzo SHORT TERM . Meier LONG TERM . Hiris AVIATION . Direnzo
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, Denver International Airport, CO||7 mi||52 min||SSW 10||10.00 mi||A Few Clouds||35°F||9°F||34%||1014.8 hPa|
|Buckley Air Force Base Airport, CO||15 mi||47 min||S 8||10.00 mi||A Few Clouds||31°F||9°F||40%||1015.3 hPa|
|Erie Municipal Airport, CO||19 mi||70 min||N 0||10.00 mi||Fair||38°F||5°F||25%||1015.2 hPa|
|Broomfield / Jeffco, CO||22 mi||50 min||W 6||10.00 mi||Clear||46°F||6°F||20%||1014.9 hPa|
Link to 5 minute data for KDEN
Wind History from DEN (wind in knots)
|1 day ago||SW||SW||N||N|
|2 days ago||SW||S||SW||SW||SW||SW||SW||SW||SW||SW||SW||SW||SW||SW||S||S||S||SE||SE||SE||SE||S||S||SW |
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.