Thursday, September23, 2021
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Marine Weather and Tides
Castle Pines, CO

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:47AMSunset 6:56PM Thursday September 23, 2021 8:32 PM MDT (02:32 UTC) Moonrise 8:30PMMoonset 9:20AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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 Castle Pines, CO
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location: 39.45, -104.89     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 232035 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 235 PM MDT Thu Sep 23 2021

SHORT TERM. (This evening through Friday) Issued at 105 PM MDT Thu Sep 23 2021

Veiled skies today under a thin layer of smoke, most of which is aloft resulting in a return to slightly hazy skies. Cumulus development can be observed over the mountains, where a few elevated showers and thunderstorms may form this afternoon and evening. Moisture will be confined to mid and upper levels of the atmosphere, with a dry sub-layer limiting activity to just virga or light rain in most cases. Locally gusty outflow winds will be possible nonetheless.

Over in the plains, low relative humidity below 15% combined with locally breezy conditions will sustain elevated to briefly critical fire weather conditions through early this evening. Abundant clouds will stream over the area tonight, and will help keep low temperatures on the milder side in the 40's for much of the plains, and low 50's for the Denver metro. Some of the high valleys may still fall below freezing.

Friday will be a little cooler as the shortwave trough currently just west of the forecast area moves on east. Highs in the plains will stay in the 70's, with 60's for most of the high country. Skies should become progressively clearer through the day. As for smoke, the passing shortwave looks to flush most of it out to our east, so expecting an improvement in visibility as a result.

LONG TERM. (Friday night through Thursday) Issued at 105 PM MDT Thu Sep 23 2021

Temperatures will climb back towards 90 over the weekend as a ridge of high pressure builds over the West. The flow aloft will remain dry and transition from northwesterly on Saturday to westerly on Sunday. In addition, the models still indicate a weak lee trough developing over eastern CO. The fire danger will be elevated in spots due to the dry and unseasonably warm conditions. By early next week, a weak closed low over Baja CA over the weekend will slip northeast towards the Four Corners, and the lee trough over eastern CO weakens. Still above average in terms of temperatures, but there will be some slight cooling. This disorganized system meanders across southern CO/NM on Tuesday, with the ridge axis shifting eastward into the Central Plains. By mid week, another trough will extend from the northern Rockies into the Great Basin. This is poorly organized as well but it should provide more seasonal temperatures with a better chance of showers/thunderstorms for the forecast area through the latter part of next week, as it slowly shifts eastward across CO. Extended models not in sync regarding the timing of the next system, but the trend for more seasonal temperatures with a better chance of precipitation still looks on track for now.

AVIATION. (For the 18Z TAFS through 18Z Friday afternoon) Issued at 105 PM MDT Thu Sep 23 2021

VFR conditions are likely to prevail through the TAF period. There is a small amount of smoke aloft, however concentrations are limited so impacts on slant visibility should be either minor or negligible. Expecting most of the smoke to clear by Friday. Otherwise, just expect an increase in high clouds this evening and tonight, at/above 18,000 ft MSL.

North/northeast winds associated with a weak surface front will peak this afternoon, then become southeasterly this evening before returning to drainage overnight. Typical diurnal wind pattern expected for Friday.

FIRE WEATHER. Issued at 105 PM MDT Thu Sep 23 2021

Widespread elevated to locally briefly critical fire weather conditions will continue through early this evening for the plains, particularly Weld, Morgan and Lincoln counties, due to the combination of breezy winds and low humidity below 15%. The fire danger will be elevated over the weekend in spots due to the dry and unseasonably warm conditions. Min rh values will be in the 10-15% range but with more marginal wind criteria, so no highlights anticipated at this time.

BOU WATCHES/WARNINGS/ADVISORIES. None.



SHORT TERM . Rodriguez LONG TERM . Cooper AVIATION . Rodriguez FIRE WEATHER . Rodriguez/Cooper


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver - Centennial Airport, CO8 mi40 minNE 510.00 miMostly Cloudy70°F25°F18%1016.2 hPa
Buckley Air Force Base Airport, CO21 mi35 minNE 710.00 miMostly Cloudy70°F24°F18%1015 hPa
Elbert Mountain - Monument Pass, CO21 mi58 minNNE 310.00 miPartly Cloudy61°F23°F23%1024.4 hPa

Link to 5 minute data for KAPA

Wind History from APA (wind in knots)
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Last 24hrSE10S12S15S9S6S7SE7S6S5CalmSE3SE3W8W4NW5NW5E5E5E10
G16
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1 day agoSE5SE7S7S6S8SW8SW6S5SW7SW6S5SE3S4Calm6S4--E7NE6E7E8E6E6SE6
2 days agoE12
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NE9N9NE5NE5E6E5S3SW5CalmCalmSW3N4N5CalmCalm6NE33NE8NE6NE8
G15
NE4E4

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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