Sunday, December15, 2019
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Marine Weather and Tides
Pierce, 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 7:14AMSunset 4:35PM Sunday December 15, 2019 8:12 AM MST (15:12 UTC) Moonrise 9:19PMMoonset 11:22AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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 Pierce, CO
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location: 40.66, -104.8     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 151106 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 406 AM MST Sun Dec 15 2019

SHORT TERM. (Today and tonight) Issued at 259 AM MST Sun Dec 15 2019

An upper level disturbance will move across srn CO late today and tonight. Deepest moisture and best QG ascent with this feature will stay over southern Colorado. In fact, most models keep any significant snow south of the CWA. At this point, it appears any decent snow later today and tonight would be mainly over Park county. Meanwhile other areas south of I-70 will see scattered areas of light snow with amounts of an inch or less late this aftn and tonight. As far as highs will keep readings in the upper 20s to mid 30s across nern CO.

LONG TERM. (Monday through Saturday) Issued at 345 AM MST Sun Dec 15 2019

The shortwave trough responsible for bringing the southern half of our CWA snow today and tonight will move off into Kansas on Monday. A weaker shortwave trough will then move over northern Colorado during the day on Monday providing weak QG ascent. Some light snow showers will be possible mainly over the mountains but a few could also fall over the Denver metro and the Palmer Divide. Very little, if any, accumulation is expected from these showers. Otherwise, temperatures will be rather chilly with highs 10 to 15 degrees below normal. Across mountain ridges and passes, wind chills will reach the -20s.

On Tuesday, ridging will develop aloft over Colorado which will lead to dry conditions and temperatures warming about 5 degrees above Monday's highs. The axis of this ridge will be over our CWA on Wednesday with increasing downslope, westerly winds at the surface. Highs will warm 5 to 10 degrees above normal with continued dry conditions.

A moderately strong trough will move through Colorado on Thursday. Since this trough will be moisture starved, no precipitation is expected outside of a few flurries in the mountains. Winds will be gusty, especially in the mountains, with gusts up to 40 mph.

Strong ridging quickly develops on Friday and lasts through next weekend. Dry conditions are expected with temperatures potentially reaching well above normal.

AVIATION. (For the 12Z TAFS through 12Z Monday morning) Issued at 259 AM MST Sun Dec 15 2019

There was an area of locally dense fog which was close to DIA early this morning. Visibilities could drop below 1/2 mile and may linger until 14z. The fog should begin to lift after the sun comes up. Otherwise for the rest of today, there could be a slight chance of light snow by late aftn which may continue through the evening hours. At this time not expecting any accumulation. Winds will become more north by mid morning and then shift to the east northeast by early aftn. By early evening they will become southeast and then go drainage by 06z.

BOU WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory from 11 AM this morning to midnight MST tonight for COZ037.



SHORT TERM . RPK LONG TERM . Danielson AVIATION . RPK


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO18 mi16 minW 410.00 miFair18°F15°F88%1015 hPa
Greeley, Greeley-Weld County Airport, CO18 mi16 minN 1110.00 miFair22°F14°F71%1017.2 hPa

Link to 5 minute data for KFNL

Wind History from FNL (wind in knots)
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Last 24hrN7N5E6NE3NE10N8NE4W3CalmE3N3N6CalmCalmS3NE6SE3S4N9N8N8SW8SW3W4
1 day agoW13
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NW11N10N9N12S3NE8S5S6S7S6S6S5SE3E8E5NE6NE7
2 days agoN4NE3CalmSW3NE4E8NE5N3NE4CalmCalmE3S3S964N7CalmS6NE3NW5CalmW5W7

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 (10,2,3,4)
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Ground Weather Radar Station Cheyenne, WY
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weather_mapweather_map weather_map

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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.