Saturday, November18, 2017

Marine Weather and Tides
Brighton, CO

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:47AMSunset 4:41PM Saturday November 18, 2017 6:22 PM MST (01:22 UTC) Moonrise 7:45AMMoonset 6:16PM Illumination 0% Phase: New Moon; Moon at 0 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 Brighton, CO
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location: 39.94, -104.76     debug

Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 182036
area forecast discussion
national weather service denver boulder co
136 pm mst Sat nov 18 2017

Short term (this evening through Sunday)
issued at 136 pm mst Sat nov 18 2017
benign weather and seasonable temperatures forecast tonight and
Sunday. 500mb ridge axis centered over the pacific coast states at
00z tonight will shift east and align over the rockies by this
time Sunday, although upper flow flattens out when a weak vort max
moves across idaho montana on Sunday. Model soundings showing an
increase in moisture above 500mb on northwest flow after mid day
Sunday, and will result in a scattered to broken layer of cirrus.

At the surface high pressure centered over the intermountain
west, while a lee trough will set up on the colorado plains.

Generally west wind in the mountains, west to southwest in the
foothills to i25, and southerly surface wind on the plains.

Temperatures driven by radiational cooling tonight and solar
warming on Sunday, and will be very close to seasonal normals.

Lows in the teens in the mountains and low to mid 20s on the
plains are right on the normal mark. Sunday MAX temps will be near
to just a few degrees above normal, with highs in the 40s in the
mountains and mid to upper 50s on the plains.

Northeast colorado seeing wind 20-25 mph gusting over 30 mph in area
northeast of fort morgan, and higher mountain elevations in similar
wind speeds. Wind to subside this evening as daytime mixing
decreases and high pressure builds in. Previous forecast had patchy
blowing snow in windier areas of high terrain, and continued that
the rest of the afternoon until wind subsides.

Long term (Sunday night through Friday night)
issued at 136 pm mst Sat nov 18 2017
northwest flow continues Sunday night into Monday, and increases
throughout the day as the nose of another strong pacific jet
comes onshore across oregon and then moves into colorado late
Monday. Ahead of the jet a weak short wave trough in the
northwest flow looks to impact our area during the day, resulting
in increased winds area-wide. Strong mid-level subsidence on the
backside of the trough should aid in transporting strong winds
(45-50 kts at 700 mb) to the surface most areas Monday afternoon
and evening. Neutral temperature advection at all levels mean
temps will be similar to Sunday, close to 60 plains and 40s in the

The 120-136 kt jet stream out of the northwest translates across
the state late Monday and throughout much of Tuesday, carving out
a long wave trough across the mississippi valley. Synoptic scale
lift is negligible, remaining far east of our area. The available
sources of lift are from the left exit region of the jet and
northwest upslope flow. Best chance of precipitation will be
confined to the west slope mountains (though still pretty low),
and should begin late Monday evening into Tuesday as the core of
the jet approaches northern colorado, which is coincident with the
arrival of some moisture in the northwest flow. Models differ on
amount of moisture available but they all agree the QPF will be
light. Most of the snow will be confined to the northern
mountains, along and north of i-70. Despite the strong northwest
flow, neutral temperature advection occurs throughout Tuesday
with 700 mb temps remaining between 0 and -4 degc during the best
chances of precipitation, though still supporting snow everywhere
in our area west of the continental divide. The jet departs late
on Tuesday, and then just light upslope snow showers could
continue into early Wednesday. The GFS advects more moisture into
the northern mountains Wednesday morning than all the other
models. Given a lack of synoptic lift and the departure of the
jet, feel precipitation should shut off everywhere but maybe the
park range by late Tuesday. Light snow may continue across the
park range through midday Wednesday.

With strong northwest downslope flow Tuesday through Wednesday,
everywhere below ~9000 feet east of the continental divide should
continue to be dry. Temperatures briefly drop into the mid to
upper 50s across the plains on Tuesday with a weak cold front and
out of the northwest and more cloud cover, but rebound into the
mid 60s on Wednesday with the departure of the jet and a
strengthening ridge aloft. Like Monday, Tuesday's winds will be
strong (but not as strong as Monday) coming off the cheyenne ridge
and along and west of i-25 into the foothills. Winds will
decrease area-wide Tuesday afternoon with the departure of the
jet. Wednesday will again have winds similar to Tuesday's winds
with a weak short wave trough passing by the northeast plains,
transporting 20-30 kt NW winds to the surface.

Thanksgiving day and Friday will be dry area-wide and well above
normal temperature-wise with a ridge aloft and downsloping east
of the continental divide. Denver's normal high for november 23
is 49, expect highs in the upper 60s plains and upper 40s to mid
50s in the mountains both days. Models then differ on what happens
to the ridge after Friday.

Aviation (for the 18z tafs through 18z Sunday afternoon)
issued at 136 pm mst Sat nov 18 2017
wind direction has settled down this afternoon out of the south.

Some high-resolution models continue to show a turn to easterly in
the 20z-24z timeframe. Strongest signal for kapa and have that in
the forecast, but left kden kbjc with more of a southerly
component through the afternoon. After 00z mainly south winds all
terminals for remainder of TAF period. OtherwiseVFR clear and no
obstruction to vis.

Bou watches warnings advisories

Short term... Hanson
long term... Schlatter
aviation... Hanson

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver, Denver International Airport, CO8 mi29 minS 910.00 miFair33°F21°F64%1024.1 hPa
Buckley Air Force Base Airport, CO15 mi84 minN 010.00 miA Few Clouds37°F20°F51%1023.9 hPa
Denver Nexrad, CO16 mi32 minSE 710.00 miA Few Clouds32°F26°F80%1023.4 hPa
Erie Municipal Airport, CO16 mi22 minWSW 910.00 miFair36°F11°F37%1024.4 hPa
Broomfield / Jeffco, CO19 mi35 minW 1450.00 miA Few Clouds41°F3°F20%1022.7 hPa

Wind History from DEN (wind in knots)
Last 24hrNE12N11CalmW9W8NW10NW24
1 day agoSW9SW15SW14S12S8SW13SW16W7SW21
2 days agoSW7W4SW3SW8SW5W66E6NE8NW5W10SW12SW13S13SW10SW13SW10S96SE3S4W4CalmW11

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralPlains    EDIT

Wind Forecast for Denver/Boulder, CO (20,4,5,8)
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Ground Weather Radar Station Denver/Boulder, CO
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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 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 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.