Monday, December9, 2019
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Marine Weather and Tides
Englewood, CO

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:07AMSunset 4:37PM Monday December 9, 2019 2:53 PM MST (21:53 UTC) Moonrise 3:15PMMoonset 4:21AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Englewood, CO
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location: 39.68, -105     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 091847 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 1147 AM MST Mon Dec 9 2019

UPDATE. Issued at 1142 AM MST Mon Dec 9 2019

Last of the QG lift coming over the mountains the next couple of hours, but the airmass is drying already with clearing almost to Steamboat Springs. We're probably seeing the last attempt at a shower band on the plains near Ft Collins and Greeley now, but it's falling into drying low level air so we don't expect much if any accumulation there either. Minor adjustments to slow the decrease in very light snow over the mountains and add some wind over the ridges. The rest of the forecast looks good.

UPDATE Issued at 547 AM MST Mon Dec 9 2019

A few snowbands stretching out over the northern and western suburbs as well as the northern plains this morning is likely being induced by a little jet max as well as surface convergence. This has disrupted the stratus over the Denver area and against the Palmer Divide and foothills, making it dissipate earlier than expected. Though still expect it to reform and persist through the morning as winds should be weak upslope.

SHORT TERM. (Today and tonight) Issued at 355 AM MST Mon Dec 9 2019

An upper trough will drop southeast across the state this morning, with moisture levels decreasing. The northwest flow aloft is favored in our mountains, so having an expiration of the Winter Weather Advisory in the late morning remains good. Snow will continue in the high country, with another 1 to 4 inches possible through the day. Wind gusts up to 40 mph will continue to cause areas of blowing snow. A cold frontal passage last night pushed in low stratus up against the foothills and Palmer Divide, covering parts of the metro area. The northwesterly surface winds over the plains will continue to make a clockwise turn into the foothills, keeping these low clouds in until late morning at least, with some hints of it lasting into the early afternoon in the foothills of Boulder and Larimer counties. Some isolated snow showers will be found over the northern plains early this morning, but these should drift east and dissipate by sunrise. The rest of the plains should remain dry, though the areas under the stratus could end up producing some flurries or light snow showers. A bit of low level instability looks to form over the Palmer Divide later this afternoon as surface winds converge over the area, have added a slight chance of snow showers.

Another jet will push south from the Northern Rockies tonight to create some lift, just enough to squeeze out any remaining moisture in the orographic flow. Have added some light snow showers over the northern mountains to account for this. Expecting less than 2 inches over the 12 hours, however winds will increase with gusts up to 55 mph to cause more blowing snow.

LONG TERM. (Tuesday through Sunday) Issued at 355 AM MST Mon Dec 9 2019

Models are in pretty good agreement with the pattern change that will take place in the latter part of this week, which could lead to significant snow and wind in the Colorado mountains Friday into next weekend.

For Tuesday, we'll see some moderation in temperatures with westerly flow and warm advection just off the deck. There will likely be some mountain wave clouds to contend with, and lee troughing will be weak. Therefore, valley areas will struggle to break out of the colder temperatures, while Denver and the mountains will see highs rebounding closer to normal. Gusty winds to around 50 mph can be expected over the mountains and wind prone areas of the foothills, as cross sections shows a mountain top stable layer and cross mountain component of 30-40 knots.

Wednesday should feature continued moderation with mid level warm advection. However, a backdoor cold front could slip across the northeast plains keeping temperatures cooler there. Thursday should see similar conditions. Dry weather will persist Tuesday through Thursday.

The weather pattern for us will change by Thursday night and Friday as a powerful 140+ knot jet moves off the Pacific. Ensembles continue to point toward a plume of high integrated vapor transport (2-3 standardized anomalies) reaching Colorado. This, in combination with strong orographics, relatively high 700-500 mb specific humidity levels of 2+ g/kg, and proximity of the upper level jet should result in a period of significant mountain snow/blowing snow. There is potential for more periods of significant snow/blowing snow into Sunday depending on the evolution of the Pacific jet stream and location/depth of embedded short waves. The vast majority of the models/ensembles are now trying to point to another wave late Saturday or Sunday. This one would bring a better chance of accumulating snow onto the plains as well, given the expected forcing and return to upslope flow behind a frontal passage. Until then, we could very likely see bouts of gusty downslope winds along the Front Range and adjacent plains. Temperatures will turn colder and drop below normal for much of next weekend behind the frontal passage.

AVIATION. (For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 1142 AM MST Mon Dec 9 2019

VFR through tonight. Some uncertainty about wind direction this afternoon. The lastest few runs of the HRRR look alright with the winds going ENE at KDEN for a few hours this afternoon. Not high confidence it will go to much of a northerly component. Winds will then go back to southerly by early evening, probably 00z-01z.

BOU WATCHES/WARNINGS/ADVISORIES. None.

UPDATE . Gimmestad SHORT TERM . Kriederman LONG TERM . Barjenbruch AVIATION . Gimmestad


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver - Centennial Airport, CO12 mi60 minE 710.00 miMostly Cloudy34°F19°F54%1015.7 hPa
Buckley Air Force Base Airport, CO14 mi2.9 hrsE 810.00 miA Few Clouds34°F20°F57%1013.9 hPa
Broomfield / Jeffco, CO17 mi62 minENE 610.00 miMostly Cloudy37°F23°F56%1014.2 hPa
Denver, Denver International Airport, CO22 mi60 minENE 610.00 miPartly Cloudy33°F21°F61%1015.8 hPa
Erie Municipal Airport, CO23 mi59 minE 410.00 miPartly Cloudy36°F22°F60%1016.3 hPa

Link to 5 minute data for KAPA

Wind History from APA (wind in knots)
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Last 24hrCalmN5W5NW3W11
G14
5NW16
G22
NW15
G25
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NW5NW11NE13
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NE7NE7CalmCalmSE7SE5SE8SE8E8E8E7E7
1 day agoCalmNW7NW4S4CalmS4S4S6E3S7S5SE7SE5S7S4S3S6S6N3CalmSE3E3E3Calm
2 days agoCalmCalmS5S5S6S5S3S3S4S4S8S7S8S6S7S5SW8SW14SW12SW14
G22
SW9SW10NW4NE4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_P
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 (16,3,4,5)
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Ground Weather Radar Station Denver/Boulder, CO
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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 numerious 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.