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 6:43AM||Sunset 7:01PM||Saturday September 19, 2020 11:35 AM MDT (17:35 UTC)||Moonrise 9:12AM||Moonset 8:42PM||Illumination 6%|
7 Day Forecast for Marine Location Near Calhan, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 191643 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 1043 AM MDT Sat Sep 19 2020
UPDATE. Issued at 1040 AM MDT Sat Sep 19 2020
Clouds are starting to dissipate after a somewhat cloudy morning across our forecast area. KDEN has reached 82 degrees at the time of this discussion which is a much warmer start than the past couple days. With less smoke in the air and a warmer start, Denver seems poised to reached 90 degrees and set the record for most 90 degree days.
I increased the PoPs slightly this evening across the mountains as the best forcing from the approaching trough should move through at that time. Otherwise, brief gusts from elevated showers are expected to be the only impact today.
SHORT TERM. (Today and tonight) Issued at 316 AM MDT Sat Sep 19 2020
An upper level trough will move across the nrn Rockies today thru tonight. At the sfc, a lee trough will be in place along the front range, with gusty south winds, over the far ern plains.
Overall, there is quite a bit of mid and high level moisture moving across the area today, however, lower levels will remain dry. Meanwhile MLCAPE is very low with soundings having an Inverted V shape. Thus, any shower activity this aftn, will be high based with mainly virga and gusty winds, over the higher terrain and possibly along the front range. As for highs, readings across nern CO will range from the mid 80s to lower 90s. Depending on cloud cover and lingering smoke, readings could be a few degrees lower than fcst in some areas.
For tonight, the nose of an upper level jet will move across srn WY and nrn CO along with some mid level cooling. Thus, the best chc of shower activity along with isold storms, will be in the nrn mtns this evening. Across nern CO, it will be dry, although I can't rule out an isold shower or two, late this evening, north of Denver to the Wyoming border. Finally, as the upper level jet moves across and subsidence occurs, may see a period of stronger winds, in the 06z-12z period, over portions of the nrn mtns and foothills.
LONG TERM. (Sunday through Friday) Issued at 420 AM MDT Sat Sep 19 2020
Models have flat upper ridging in place over the CWA along with weak zonal flow aloft Sunday through Monday night. There is weak downward vertical velocity progged on the QG Omega fields for the CWA Sunday into Monday morning, then weak upward motion the rest of Monday and Monday night. The low level pressure and wind fields keep weak troughing east of the mountains and normal diurnal wind trends Sunday through Monday night. Concerning moisture, precipitable water values are in the 0.40 to 0.80 inch range range Sunday through Monday night. The better moisture is progged on Monday. Instability is lacking for much of CWA on Sunday, with only a tad of CAPE indicated over the mountains. CAPE is better on Monday with decent amounts in the mountains and even a tad over the northeastern corner. For pops, will keep some minor pops in over the mountains late day Sunday, but better pops in mountains for late day Monday. Will even need a bit of measurable rainfall. For temperatures, Sunday's highs are 0-1.5 c cooler than today's expected highs. Monday's readings are very close to Sunday's highs. For the later days, Tuesday through Friday, upper ridging will remain in control of the CWA's weather. The upper ridge is centered over the south central U.S. on Tuesday, then is over the southwestern U.S. Wednesday through Friday. The flow aloft remains weak all four days. There is okay moisture for Tuesday, less Wednesday then very little Thursday and Friday. Temperatures are to stay above seasonal normals all four days.
AVIATION. (For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1028 AM MDT Sat Sep 19 2020
Southwesterly flow is persisting this morning but should weaken and veer towards northeasterly by the early afternoon. While much of the morning was spent using ILS due to smoke, there has been improvement and ILS is not expected to be needed for the rest of the day. Later this afternoon, virga may develop over the terminals which could produce brief gusty winds potentially up to 25 knots. Winds should eventually transition to drainage this evening and continue overnight.
FIRE WEATHER. Issued at 420 AM MDT Sat Sep 19 2020
Elevated fire danger will exist over much of the area this afternoon into the early evening hours due to warm temperatures and dry conditions. Winds will be gusty over the higher terrain and far eastern plains as well.
Fire danger will elevated Sunday afternoon and early Sunday evening over the some of the plains with fairly low relative humidities expected.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Danielson SHORT TERM . RPK LONG TERM . RJK AVIATION . Danielson FIRE WEATHER . RPK/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.
|ELLICOTT-B AFA, CO||18 mi||98 min||N 3||10.00 mi||Mostly Cloudy||74°F||30°F||20%||1014.5 hPa|
Link to 5 minute data for KABH
Wind History from ABH (wind in knots)
|1 day ago||SW||SW||S||S||S||S||S||SE||SE||E||SE||N||NE||N||N||N||N||N||Calm||E||W||S||S|
|2 days ago||N|
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. Disclaimer:
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.