Wednesday, April26, 2017

Marine Weather and Tides
Brighton, CO

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:03AMSunset 7:50PM Tuesday April 25, 2017 11:56 PM MDT (05:56 UTC) Moonrise 5:54AMMoonset 7:02PM 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 260209
area forecast discussion
national weather service denver/boulder co
809 pm mdt Tue apr 25 2017

Issued at 759 pm mdt Tue apr 25 2017
pcpn was gradaully shifting southward along the
front range this evening and was mainly along and south of line
from denver eastward into southern washington county. Based on
current trends most othe pcpn should end around midnight except
over SRN lincoln county. There has been some snow over the palmer
divide and could see another few inches before pcpn ends by

Short term (this evening through Wednesday)
issued at 301 pm mdt Tue apr 25 2017
scattered showers and thunderstorms will continue through the
afternoon and into the early evening hours. Airmass is slightly
unstable with CAPE less than 500 j/kg. Because of the cool airmass
in place most of the thunderstorms will produce small hail. In
the mountains, brief heavy snow will accompany the showers and
storms where a quick inch or 2 will be possible in an hours.

A cold front will drop south across eastern colorado late this
afternoon and early evening. This will help trigger additional
showers and thunderstorms. Behind the front, north-northeast
upslope winds will help produce lift and expect stratiform rain to
form in the upslope favored areas south and west of denver.

Precipitation is expected to shift south across the area this
evening and exit the area around midnight. It becomes cold enough
for snow down to 5000 feet, so any precipitation that lingers
through mid evening will likely change to snow. Drier air and
subsidence moves in after midnight bringing clearing skies with
it. Could see fog in low lying areas along the front range if
enough radiational cooling takes places. Expect enough wind over
the eastern plains to keep fog from forming. Lows will be chilly
tonight with lower 30s expected over northeast colorado.

For Wednesday, subsidence and dry air is expected to produce
partly cloudy to mostly sunny skies during the morning. Orographic
lift over the mountains due to northwest flow aloft may produce a
few snow showers during the morning. Moisture and instability
over the mountains and adjacent plains increases during the
afternoon. Expect scattered afternoon showers over the mountains
with isolated showers and storms possible over the plains. Like
today it will be cool with readings in the mid to upper 50s.

Long term (Wednesday night through Tuesday)
issued at 301 pm mdt Tue apr 25 2017

Unsettled weather pattern through Saturday...

Wednesday night into Thursday QG energy will increase with a finger
of the 100kt jet moves over NE colorado Wednesday evening through
early Thursday. Pacific moisture will increase combining with
decent lapse rates to bring continued snow showers to the high
country Wednesday night into Thursday. Snow level should drop to
around 8000 ft with 3 to 6 inches expected by Thursday afternoon.

On the plains there is a slight chance of rain showers with a
frontal boundary pushing south by the afternoon increasing
convergence over the northern plains. Some isolated thunderstorms
are possible by late Thursday afternoon but at this time cape
values are only showing in the 200 to 300 j/kg range with deep
shear in the 20s. Temperatures on Thursday will continue to show
cooling with highs in the 50s and lows overnight dropping to just
above freezing after cold frontal passage.

For Friday and Saturday models are showing more agreement with the
path of the storm minus the tail end on Saturday. The upper level
trough will flatten out as the closed low begins to move south by
Friday morning bringing upper level flow more westerly. Westerly
flow over the higher terrain combined with a deepening inverted
trough at the surface will help to increase downsloping at the
base of the foothills through Friday afternoon. This will keep
areas along the urban corridor dry while the mountains and
portions of the eastern plains continue to see increased chances
of precipitation. The upper low will continue to drop south during
the day Friday along with the surface low increasing easterly
flow on the plains by Friday evening into Saturday. This will
increase upslope and bring moderate precipitation to the foothills
and plains late Friday into Saturday. Snow levels will be low
enough for snow on the plains by Friday afternoon with
temperatures in the 40s on Friday decreasing to below freezing
overnight into Saturday. Snow amounts will vary on the plains with
anywhere from 2 to 8 inches possible by late Saturday. As
mentioned before the models start to diverge on Saturday afternoon
with the GFS having the low center moving faster to the SE then
the euro. If the euro solution comes to fruition then more snow
would be possible as favorable upslope would continue longer. Will
keep confidence low at this time given variations in the models.

Temperatures will stay in the 30s on Saturday with temperatures
dropping into the 20s overnight into Sunday.

By Sunday into Monday the upper low will transition to the south and
east with increasing subsidence over the region helping to clear out
precipitation. Temperatures will slowly rebound through Monday with
highs expected to return to the 60s.

Aviation (for the 00z tafs through 00z Wednesday evening)
issued at 759 pm mdt Tue apr 25 2017
one more band of steadier rain may affect dia by 9 pm and
then activity will be more sct in nature fm 9-10 pm. After
10 pm pcpn should gradually end. Ceilings between 3000 and
5000 ft will continue thru midnight and then should rise
abv 10000 ft as drier air moves across. Winds will
remain nne between 15-20 mph for the next few hours but should
decrease by 10 pm or so. Late tonight winds will become drainage
around 11z.

Bou watches/warnings/advisories

Update... Rpk
short term... Meier
long term... Bowen
aviation... Rpk

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver, Denver International Airport, CO8 mi63 minNNE 1310.00 miOvercast33°F27°F78%1008.5 hPa
Buckley Air Force Base Airport, CO15 mi2 hrsNNE 1110.00 miOvercast35°F35°F99%1008 hPa
Denver Nexrad, CO16 mi5 hrsN 12 G 3010.00 miRain45°F37°F76%1005.8 hPa
Erie Municipal Airport, CO16 mi62 minNE 810.00 miOvercast35°F28°F76%1011.8 hPa
Broomfield / Jeffco, CO19 mi2.2 hrsNE 1215.00 miOvercast37°F32°F81%1010.8 hPa

Wind History from DEN (wind in knots)
Last 24hrN7NW14NW9E5SE5S5SW9W19
1 day agoSW9S10SW10NW10NE6E8SE9SE7NE10E8
2 days agoS17S17S18S17S16S10W9W9SW10W12W8W66SE11

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 (1,6,7,8)
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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.