Marine Weather and Tides
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:59AM||Sunset 4:37PM||Monday November 30, 2020 10:46 AM MST (17:46 UTC)||Moonrise 5:58PM||Moonset 8:12AM||Illumination 100%|
7 Day Forecast for Marine Location Near Foxfield, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 301726 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 1026 AM MST Mon Nov 30 2020
UPDATE. Issued at 1026 AM MST Mon Nov 30 2020
No changes to the forecast planned. Surface high pressure sliding east across Colorado will bring sunny skies and mild temperatures for the rest of today. Other than breezy west winds along and near the foothills at times, winds will be light.
SHORT TERM. (Today and tonight) Issued at 452 AM MST Mon Nov 30 2020
Today looks like the warmest day of the work week. A short wave ridge moves across the state today with west-northwest flow aloft and neutral temperature advection until Monday evening. There is some decent downslope flow across the east slope foothills and parts of the adjacent plains, and combined with 700 mb temps around 0, highs across the plains should reach the low to mid 50s other than areas east and northeast of Denver, extending to Morgan County, where there is still decent snowpack. Highs should just reach the upper 40s there. Across the mountain valleys, expect highs in the 30s. The air is exceptionally dry at all levels today, so break out the lip balm and moisturizer. We expect PW values to be near 0.05".
Tonight cold advection aloft begins in earnest a little before sunrise Tuesday. Increasing northwest flow at 700 mb associated with the passing of a trough axis that should extend from E. WY and MT into north central Colorado by early morning. 700 mb temps crash during this time to below -10 degC. Until then, temperatures will actually be fairly warm across the east slope foothills and urban corridor tonight via mechanical mixing and downslope flow east of the Divide. Expect lows around 30 degrees in the locations that have downslope flow all night along and west of I- 25. Further east lows should be in the teens to low 20s. Across the mountain valleys west of the Divide, lows will be in the single digits with mostly clear skies and very dry air. With how dry it is on the backside of the first trough early Tuesday, it will take a while for the atmosphere to moisten, so just some mountain pops starting by sunrise Tuesday with increased upslope, instability, and slightly more than bone dry for moisture. The long term discussion will cover further precipitation details next.
LONG TERM. (Tuesday through Sunday) Issued at 452 AM MST Mon Nov 30 2020
There's decent general agreement on the large scale pattern, and some convergence on the details. A complex trough will drop across the Rockies Tuesday and Wednesday. The first part will drag colder air and a broad area of QG lift across the central Rockies on Tuesday as the flow goes northerly. A second pocket of cold air will dig the trough further west on Wednesday, bringing the deep flow to an easterly component by late Wednesday. There's a second shot of weak lift as this goes past, with some disagreement on how strong it will be and whether it's mainly over western Colorado and Utah or comes across our area. In general, the ingredients for snow are present much of this time, though often weak. The initial air on Tuesday may be dry at low levels, but the cooling and lift eventually should bring saturation. There's decent neutral stability at low levels on Tuesday, and this layer is actually pretty deep during the day Wednesday as the 500 mb temperature drops to -38 C. While the winds won't be that strong outside of a few hours of north winds on the plains behind the cold fronts each day, there will be periods of upslope against the Front Range and the Palmer Divide. All this adds up to a decent chance of snow, just not big amounts, focused on Tuesday afternoon and during the day Wednesday. We've raised PoPs a bit, and they may need to come up more. But we're still looking at totals for both days under 2 inches on the plains, there could be 6 or 8 inches for the whole event on the ridges and east slopes of the Front Range. It should all be light enough to have little or no travel impact.
Forecast temperatures are close to model guidance and look alright, probably falling in the 30s Tuesday afternoon and in the 20s Wednesday, maybe eking out some low 30s.
After that, the upper ridge settles over the northwest with light northerly flow. We'll have that unusual warming from the north, with more warming aloft than at low levels for the first couple of days. Some models lose the cool air layer, while some EC runs keep us in the 40s through the weekend . possibly a combination of their low level pattern and more snow in those runs? Cooler may be legitimate for Thursday and Friday if the trough is slow to leave and we have enough snow cover to hold things back for an extra day, but the blended solution seems good for now. A little more northwest component to the low level flow and we could be a little warmer for the weekend.
AVIATION. (For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 1026 AM MST Mon Nov 30 2020
Clear skies will prevail today. High clouds will increase tonight as a storm systems drops south across Northern Rockies. This system will move south across the Central Rockies on Tuesday. A cold front will push through Tuesday morning with gusts to around 30 knots. Northerly upslope winds may help produce light snow at the Denver airports late Tuesday morning and afternoon. In addition to the chance for snow, ceilings are expected to fall below 6000 feet at times during this time frame.
BOU WATCHES/WARNINGS/ADVISORIES. None.
UPDATE . Meier SHORT TERM . Schlatter LONG TERM . Gimmestad AVIATION . Meier
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||6 mi||54 min||SW 9||10.00 mi||Fair||45°F||7°F||21%||1024.1 hPa|
|Buckley Air Force Base Airport, CO||7 mi||49 min||S 9||10.00 mi||Fair||44°F||8°F||23%||1022.8 hPa|
|Denver, Denver International Airport, CO||16 mi||54 min||SSW 10||10.00 mi||Fair||43°F||12°F||29%||1023 hPa|
Link to 5 minute data for KAPA
Wind History from APA (wind in knots)
|1 day ago||Calm||SE||Calm||Calm||Calm||N||Calm||Calm||SW||SW||S||S||SE||E||W||N||NW||NW||N||N||N||Calm||NE||N|
|2 days ago||N||N||Calm||Calm||S||Calm||Calm||Calm||W||S||S||S||SE||SE||SE||S||S||SE||S||S||S||SE||E||Calm|
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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.
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