Tuesday, January21, 2020
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Marine Weather and Tides
Denver, CO

Version 3.4
NOTICE
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 7:14AMSunset 5:06PM Tuesday January 21, 2020 11:22 AM MST (18:22 UTC) Moonrise 5:35AMMoonset 3:18PM Illumination 12% Phase: Waning Crescent; Moon at 26 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 Denver, CO
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location: 39.76, -104.88     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 211735 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 1035 AM MST Tue Jan 21 2020

UPDATE. Issued at 1035 AM MST Tue Jan 21 2020

The mountain areas are in between two systems late this morning, in the dry air behind last night's weak disturbance and ahead of the moisture associated with the next disturbance. Satellite imagery shows some brief clearing over the mountains now, which will be replaced by high level clouds later this afternoon. A band of convective showers is also evident over Utah which will be moving over Colorado later tonight. Radar imagery from the western slope shows quite a bit of coverage from light precipitation, so the north central mountains should be filling in later this afternoon. The only changes to the forecast will be to decrease the chances of snow showers from now through mid-afternoon. Snow amounts from tonight will still be light, although the shift of winds to more west and northwest will help with the production of snowfall later tonight.

SHORT TERM. (Today and tonight) Issued at 251 AM MST Tue Jan 21 2020

An upper level disturbance will move across Colorado today through this evening, providing abundant cloud cover, a bit cooler temperatures, and snow showers for the mountains. Currently, first wave of moisture is moving across the area with ceilings lowering between 7000 and 10000 ft agl across the adjacent plains. Observations in the mountains showing snow showers developing and expect periodic snow showers expected today and continuing tonight. Quite a bit of subtropical moisture moving in ahead of the main trof and riding along a strong 100kt jet which will shift south of Colorado by later this afternoon. In fact, even some low clouds have developed over far eastern Colorado with moistening southeast low level flow.

Cross sections over the mountains showing moisture deepening this afternoon with mountain top flow shifting a bit more west and northwest but speeds still only 10-20kt. Cold air advection settles in this evening with trof passage and improving lapse rates. QG fields showing only weak ascent with this trof so overall snowfall amounts expected to be on the light side with up to 3 inches today and similar amounts/slightly heavier for tonight. Still amounts below advisory number so no hilites planned for this event. Heaviest amounts likely in zone 31, around Rabbit Ears Pass.

Across lower elevations today, abundant cloud cover expected in the mid/upper levels. This may hold high temperatures down a bit this afternoon or similar compared to yesterday. No precipitation expected on the plains but could see some virga showers with the lowering ceilings.

LONG TERM. (Wednesday through Monday) Issued at 251 AM MST Tue Jan 21 2020

NW flow aloft will be across the area on Wed. Although moisture depth in the mtns is rather shallow, favorable orographics combined with lapse rates in the 6-7 c/km range, should allow for generally light orographic snow. Across nern CO, northwest low level flow will be in place, with only some mid level moisture moving across, so will not mention any precip. Winds will be gusty across the plains with highs similar to Tue.

For Wed night into Thu, an upper level trough will intensify across the central plains, with increasing NW flow aloft over the area. Cross-sections continue to show moisture embedded in the flow affecting the mtns, however, lapse rates are fcst to become more stable. Thus, despite favorable orographics, any additional snow will be on the light side. Over nern CO, it will remain dry, with another day of gusty north to northwest winds, as a cool front affects the area. This front will drop highs back into the lower to mid 40s.

Looking ahead to Fri, the flow aloft will remain northwesterly. There is still some moisture embedded in the flow, however, lapse rates will remain stable in the mtns, so will only mention a slight chc of snow. Across nern CO, there is a stg upper level jet which will affect the far nern plains. Thus this feature could end up producing a slight chc of snow, if there is enough moisture available. Otherwise, it will remain dry, with highs mainly in the 40s over nern CO.

For the weekend, Sat looks dry, except for a chc of snow in the mtns, as a weak disturbance embedded in NW flow aloft moves across. On Sun, an upper level ridge will build into the region with dry conditions. Temperatures over nern CO will be above normal both days.

AVIATION. (For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1035 AM MST Tue Jan 21 2020

Ceillings should remain above 6000 feet AGL through this afternoon and tonight as a couple of weak weather disturbances pass over the state. Surface pressure gradients will remain weak with wind speeds generally less than 10-12 knots for the next 24 hours. Northeasterly winds win the afternoon will transition back to drainage southerlies after sunset.

BOU WATCHES/WARNINGS/ADVISORIES. None.

UPDATE . Dankers SHORT TERM . Entrekin LONG TERM . RPK AVIATION . Dankers


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Buckley Air Force Base Airport, CO7 mi85 minN 010.00 miMostly Cloudy43°F21°F41%1014.5 hPa
Denver, Denver International Airport, CO13 mi30 minNE 510.00 miMostly Cloudy43°F17°F35%1013.9 hPa
Denver - Centennial Airport, CO14 mi30 minWNW 410.00 miMostly Cloudy52°F25°F35%1013.5 hPa
Broomfield / Jeffco, CO16 mi34 minNNE 825.00 miOvercast45°F15°F31%1014.2 hPa
Denver Nexrad, CO18 mi29 minNE 410.00 miOvercast46°F21°F37%1014.6 hPa
Erie Municipal Airport, CO19 mi23 minN 310.00 miFair42°F16°F36%1016.3 hPa

Link to 5 minute data for KBKF

Wind History from BKF (wind in knots)
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Last 24hrCalmE6E7E7E4E5SE9S10SW6S9S8S12S12SW6SW7NW3CalmCalmS6W3CalmS4CalmW4
1 day agoCalmCalmE3E4NE5E6E7SE9SE8S9S8S10S10S11S7S3S7S8S8SW8S8SW5SW6SW4
2 days agoCalmCalmN11N6NE6E3CalmW4N6CalmS6S7S6S5S6S7S6CalmCalm--SW3SW3S4Calm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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

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Wind Forecast for Denver/Boulder, CO (13,3,4,5)
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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 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.