Wednesday, May27, 2020
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Marine Weather and Tides
Pierce, 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 5:32AMSunset 8:21PM Tuesday May 26, 2020 11:23 PM MDT (05:23 UTC) Moonrise 8:46AMMoonset 12:00AM Illumination 25% Phase: Waxing Crescent; Moon at 5 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 270147 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 747 PM MDT Tue May 26 2020

UPDATE. Issued at 747 PM MDT Tue May 26 2020

Pretty quiet evening with scattered to broken mid level clouds passing across the forecast area. Perhaps a couple of sprinkles in the mountains. Most of the clouds will be clearing overnight, with pleasant temperatures and light winds expected. On Wednesday, we'll see moisture gradually increase as the ridge axis shifts east and a weak cold front drops across the plains. Forecast for scattered shower and storm coverage looks good, with most of it holding off until late afternoon or evening for the I-25 Corridor and plains. Gusty winds and brief moderate rainfall expected for the most part given limited CAPE under 500 J/kg and DCAPE near 1000 J/kg.

SHORT TERM. (This evening through Wednesday) Issued at 224 PM MDT Tue May 26 2020

A ridge of high pressure will keep a dry and subsident airmass over the forecast area tonight. On Wednesday, the ridge will shift slightly to the south and east, as a weak disturbance moves across WY/northern CO in the afternoon. Scattered showers and thunderstorms will develop over the mountains of Jackson/Larimer counties, then shift to the southeast in the afternoon. Surface winds will become northwest as a weak frontal boundary passes across northeast CO. RAP20 soundings show inverted-v type soundings. ML CAPES range from 300 j/kg in Denver to 800 j/kg around Ft Collins. DCAPE 800-1100 j/kg. Consequently the main threat from the storms would appear to be strong wind gusts up to 45 mph and brief light/moderate rainfall. In terms of timing, it looks like the storms will not make it to the far eastern zones (46,47,48>51) until Wednesday evening.

LONG TERM. (Wednesday night through Tuesday) Issued at 224 PM MDT Tue May 26 2020

A short wave trough passing to the north of Colorado will bring scattered showers and thunderstorms Wednesday evening. Some of the showers are expected to linger overnight. A cold front drops south across eastern Colorado early Thursday morning. Northeast winds behind it will usher in cooler and more stable air. There will be a chance for showers and thunderstorms over the mountains and higher foothills where it will be above the inversion. Due to northerly winds aloft, storms are expected to travel southward. This should keep convection confined to the higher terrain Thursday afternoon and evening.

An intensifying upper level ridge over the Desert Southwest will move eastward Friday and on Saturday the center of the ridge progresses east across Colorado. This ridge will bring warmer temperatures. By Saturday, highs will be approaching 90F across northeast Colorado. Models indicate subtropical moisture will lift north under the ridge and over Colorado. Convection Friday is expected to be isolated to scattered. On Saturday, convection expected to be scattered with the best chance over the higher terrain and near by plains.

For Sunday and early next week, the upper level ridge will very slowly inch eastward across the Southern/Central Plains and then into the southeast part of the country. Out west, a large upper level trough will be along the west coast and over the western states. This will put Colorado under a south to southwest flow aloft. Warm temperatures will prevail under this pattern with highs in the upper 80s to lower 90s expected through the weekend and into Tuesday. Models differ on the amount of moisture that will be lifted northward. The GFS is very robust and has scattered to numerous showers and thunderstorms Saturday through Tuesday. The ECMWF has daily convection as well, but not as much. Best chance for storms will be over and near the higher terrain. With steering winds pushing storms to the north to northeast, the storms may have a tough time making it to eastern Colorado.

AVIATION. (For the 00Z TAFS through 00Z Wednesday evening) Issued at 747 PM MDT Tue May 26 2020

VFR conditions expected through Wednesday. Next concern will be for gusty outflow winds from showers and a couple storms late Wednesday afternoon and evening. Any chance will likely be after 21Z-22Z, with the best chance 00Z-04Z. Gusty outflow winds to 30-35 knots the main threat, and enough threat to put TEMPO gusty winds in the TAFS for this period. Outside of that, south/southwest winds tonight will likely turn northeasterly toward 15Z Wednesday, and then northeasterly toward 19-20Z. Speeds mostly 10 knots or less.

BOU WATCHES/WARNINGS/ADVISORIES. None.

UPDATE . Barjenbruch SHORT TERM . Cooper LONG TERM . Meier AVIATION . Barjenbruch


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO18 mi27 minSE 1010.00 miMostly Cloudy66°F37°F36%1012.3 hPa
Greeley, Greeley-Weld County Airport, CO18 mi27 minESE 310.00 miMostly Cloudy60°F42°F52%1014.5 hPa

Link to 5 minute data for KFNL

Wind History from FNL (wind in knots)
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Last 24hrCalmNE3N6N6N7NE5N3Calm4CalmS4SE3W54NW6SW54W6SW6W6SW4W3E11SE10
1 day agoSE4N4NE5N5N3NE4N3CalmNW3CalmCalm35SW45533CalmSW3S3S4CalmSE7
2 days agoN19
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N13NE7NE8NE6NE5CalmN5NW3NW63CalmNE8N5N11N17
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N4CalmSE4SE4S4S5S4S5

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Denver/Boulder, CO (1,6,7,8)
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Ground Weather Radar Station Cheyenne, WY
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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.