Marine Weather and Tides
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 6:47AM||Sunset 6:56PM||Thursday September 23, 2021 8:32 PM MDT (02:32 UTC)||Moonrise 8:30PM||Moonset 9:20AM||Illumination 93%|
7 Day Forecast for Marine Location Near Castle Pines, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
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 StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Denver - Centennial Airport, CO||8 mi||40 min||NE 5||10.00 mi||Mostly Cloudy||70°F||25°F||18%||1016.2 hPa|
|Buckley Air Force Base Airport, CO||21 mi||35 min||NE 7||10.00 mi||Mostly Cloudy||70°F||24°F||18%||1015 hPa|
|Elbert Mountain - Monument Pass, CO||21 mi||58 min||NNE 3||10.00 mi||Partly Cloudy||61°F||23°F||23%||1024.4 hPa|
Link to 5 minute data for KAPA
Wind History from APA (wind in knots)
|1 day ago||SE||SE||S||S||S||SW||SW||S||SW||SW||S||SE||S||Calm||S||E||NE||E||E||E||E||SE|
|2 days ago||E|
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