Thursday, January18, 2018 L-36.com


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 7:16AMSunset 5:03PM Wednesday January 17, 2018 10:35 PM MST (05:35 UTC) Moonrise 8:37AMMoonset 6:48PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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 180402
afdbou
area forecast discussion
national weather service denver boulder co
902 pm mst Wed jan 17 2018

Update
Issued at 902 pm mst Wed jan 17 2018
just a few high thin clouds drifting in from the northwest this
evening. Good radiational cooling setting up for valley locations
again with light winds and dry atmosphere. Goes-16 3.9 micron
imagery showing warm downslope in place across the foothills, and
light downslope winds there should keep them on the warmer side
overnight. Forecast on track.

Short term (this evening through Thursday)
issued at 355 pm mst Wed jan 17 2018
dry and warmer conditions are expected through Thursday under an
upper level ridge. Warming will be due, in part, to 700mb
temperatures rising to near 3 degrees c. Latest satellite imagery
shows cirrus over montana. Some of this moisture should spill
over the ridge and move into colorado tonight potentially leading
to thin clouds. Impacts from the thin clouds on temperatures
should be minimal.

Long term (Thursday night through Wednesday)
issued at 355 pm mst Wed jan 17 2018
Thursday night, a positively tilted upper ridge passes over the
forecast area causing the northwest 700-500 mb flow to turn
southwesterly overnight. The shift in direction begins ushering in
high-level moisture as well as warmer air with a 4-5 deg c increase
in the 700-500mb temp from 12z Thu to 00z fri. Model guidance
indication MAX temps on the plains in the mid 60s to low 70s in the
greater denver metro area with the help of a swly downslope wind.

Will be most pronounced. Farther out across the plains, temperatures
not quite as warm as per the models. SE little reason to go against
them, although not all that sure we'l see any 70 deg readings. That
said, the record high for denver on Thursday is 68f. I feel pretty
confident we'll at least tie this record, assuming the high-level
mtn wave cloud band doesn't become as thick as that indicated on the
gfs. High country temperatures also quite warm for this time of year
with 40s and lower 50s on valley floors. If it were not for 25-35
pct min rhs, the 10-20kt swly winds in north and south parks Friday
afternoon would further elevate wild fire concerns in these areas.

Min rhs near 15 pct along the foothills and palmer divide adjacent
to the denver area Fri afternoon, but wind speeds are generally
expected to be less than 15 mph. While winds will be much stronger
on the high mtn ridges where gusts will be in the 35-50kt range.

Friday night into Saturday... Mid and high-level moisture streaming
up from the desert SW ahead of an open wave upper trough will spread
over the region during the period. Model consensus has this trough
moving over nevada Friday night and over utah on Saturday. The mean
layer flow just ahead of the trough is nearly longitudinal which
will continue to advect warm mid-level air over eastern colorado
during the day Saturday. And, the low-level flow on the plains is
still south-southwesterly. So, one more day of above average
temperatures, warmest along the SRN foothills and palmer divide
where mid-upper 50s appear reasonable even with increasing and
lowering cloud cover. Model QG fields indicate a steady increase in
large scale ascent through the day and with it the development of
scattered rain and snow showers across the high country. Snow level
starts out high, around 10,000 feet around midday. By evening snow
levels fall to around 6500 ft asl, with rain showers on the plains
mixing with and changing to snow with the arrival of colder air
behind a not so impressive looking cold front. The GFS drops it
through the denver metro by mid-evening, while other models hold off
until after midnight. This storm system looks moisture starved based
on mean layer specific humidity and precipitable water fields.

There's quite a bit of uncertainty as to how much if any snow
accumulation areas east of the front range will see by midday
Sunday. Depending on how soon the rain-snow change over occurs,
areas along the front range and over the palmer divide could see
anywhere from 1 2 to 4 inches, maybe a bit more on the palmer dvd
with the nly post-frontal winds. Do not see all that much upslope
forcing along the foothills, so foothill areas may not receive all
that much snow either. The odd man out, the impressive QG forcing
with this system. Models indicate the strongest deepest ascent over
the fcst area just after frontal passage. Unfortunately, moisture
isn't look all that great.

On Sunday, moisture and cold air wrapping around the back side of
this trough may give us our best chance for snow accumulation east
of the mtns. However, by the afternoon with sfc-700mb winds turning
nwly, could see a fairly dramatic drop off in precip over the along
the front range, while mostly light snowfall continues farther out
on the plains. Temperatures not as cold with this system, so high s
on the plains Sunday are expect to be above freezing. Should see a
steady drop off in snowfall in the high country and northeast
plains during the evening hours.

Looks ahead to early next week, dry and slightly warmer conditions
return to the region, although some of the models show a weak
clipper system possibly brushing the higher mtns with snow and
gusty winds on Tuesday.

Aviation (for the 06z tafs through 06z Thursday night)
issued at 902 pm mst Wed jan 17 2018
vfr conditions with only increasing high clouds above 20 thousand
feet agl through Thursday night. Normal diurnal wind patterns
will occur through this period.

Bou watches warnings advisories
None.

Update... Barjenbruch
short term... Sullivan
long term... Baker
aviation... Barjenbruch


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver, Denver International Airport, CO8 mi43 minS 910.00 miFair25°F15°F66%1025.2 hPa
Buckley Air Force Base Airport, CO15 mi38 minS 1010.00 miFair30°F13°F49%1024.6 hPa
Denver Nexrad, CO16 mi41 minS 810.00 miFair30°F18°F62%1023.4 hPa
Erie Municipal Airport, CO16 mi42 minN 010.00 miFair23°F14°F69%1025.1 hPa
Broomfield / Jeffco, CO19 mi51 minSSW 530.00 miClear36°F3°F25%1023.4 hPa

Wind History from DEN (wind in knots)
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Last 24hrSW6SW5SW5W3SW3CalmCalmNW3CalmSW5SW7SW7W83SE4E43CalmE3SE6S9S12S11S9
1 day agoSE10SE9S10SE10S10S8SW7SW3SW4S8S4SW4SW4SE4E4SE3SE3SE6SE8SE8S9S7S10SW6
2 days agoE14E11CalmCalmCalmE12E10NE18NE11NE8NE11NE12NE10N9E5NE8NE11NE11NE5E7E6E8SE6SE9

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
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IR Satellite Image from GEOS
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GOES Local Image of CentralPlains    EDIT
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Wind Forecast for Denver/Boulder, CO (0,6,7,8)
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Ground Weather Radar Station Denver/Boulder, CO
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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 numerious 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.