Monday, September25, 2017 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 6:49AMSunset 6:51PM Monday September 25, 2017 2:34 PM MDT (20:34 UTC) Moonrise 12:03PMMoonset 10:22PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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 251713
afdbou
area forecast discussion
national weather service denver boulder co
1113 am mdt Mon sep 25 2017

Update
Issued at 1110 am mdt Mon sep 25 2017
still monitoring subtle weather features, making cloud and precip
forecasts difficult. A few showers over the southern foothills
have begun to push northeast off the the hills and help break up
some of the cloud cover over the metro areas. The brief break will
likely cloud up again as some convection is able to form. Still
not expected thunderstorms over most of the area... .If any do form
it seems like the high terrain would have the best chance with the
plains remaining mostly cloudy. Some thunder over the southeastern
co plains should skirt to the east of the area as well.

Have adjusted pops down over the high terrain this morning as well
as slightly lower for this afternoon as the best moisture will be
east of the divide. Otherwise the forecast remains good for the
day and evening. Still some hints of some showers remaining over
the plains south of i70 past midnight, but will continue to
investigate this potential. Fog potential over the northern plains
and mountains will still be there as well - still need to watch
about over the plains near the palmer divide if the clouds clear
quicker.

Short term (today and tonight)
issued at 458 am mdt Mon sep 25 2017
lots of subtle things happening this morning. Moist cool low level
air remains in place, but there was a little drier air working in
from the northern border into denver since midnight. This brought
a little clearing, which has now largely filled in again after a
couple degrees of cooling. Meanwhile, low levels are still moister
out on the plains and south of denver. Another jet streak will
pass over eastern colorado today. This is producing rain over the
southeast border areas, and lighter showers further west as far as
salida at this time. This will spread north across northeastern
colorado and should bring an increase in the light rain and or
drizzle later this morning into the afternoon. This may be moving
away from our area by late afternoon. Meanwhile, there is
agreement on an area of lift rotating out from underneath the low
across the northern mountains in the afternoon and possibly early
evening. Like the wave yesterday, this should bring some showers
to the mountains, and the lift could enhance the drizzle again
late in the day, mainly north of denver. One difference is that
there is this pocket of low level dry air currently north and west
of denver. Over the plains this may be wiped out by the midday
wave, but the low level dry air is better established over the
mountains, and should limit the amount of precipitation there
today.

For tonight, drier air aloft moves in, and the low mid level
drying will also try to edge eastward. However, moisture will
remain south of a mid level deformation zone, across southern
colorado. Some disagreement on how this boundary shifts. Better
odds of clearing across areas north of denver, but it could spread
south to denver and limon during the night before coming northward
again Tuesday morning. This will have some impact on low
temperatures, though areas that clear will see a lot of
condensation, possibly patchy fog, and possibly frost in the
colder spots. It should be too warm to worry about freezing on the
plains except maybe in the cool spots northeast of greeley, but we
will have to try to pin down the clearing and frost potential
today.

Long term (Tuesday through Sunday)
issued at 458 am mdt Mon sep 25 2017
Tuesday and Tuesday night, the models continue to show a cool but
dry west southwest flow aloft as the first trough exits to the
north and east and another digs into the great basin. Only qpf
generated in the models appears to be around south park in the
late aftn and early evening period. Wednesday and Wednesday
night, a weak diffluent southerly flow aloft will be in place
with the closed upper low over northern arizona. Temperatures will
moderate a bit with moisture increasing across southern and
western co. Will keep chance pops primarily in the mountains with
the highest coverage south of interstate 70. Aside from isolated
pops near the foothills and palmer divide, no QPF generated by the
models over the northeast plains. Thursday into Friday, the
models want to lift the closed low to the north and east. It is
progged to be along the co ut line by midday Thursday, then opens
up as it continues to lift to the north and east, over
southeastern wy by 12z Friday. Warming trend will continue, with
enough heating to include a chance of thunderstorms as well.

Highest coverage will be in the mountains, with isolated to
scattered coverage over the northeast plains both days.

Temperatures will be at to slightly above normal by the the
weekend. GFS and ECMWF are about 90 degrees out of phase at that
time, so confidence in the weekend period is on the low side.

Generally slgt chc pops in the grids both days, primarily in the
mountains.

Aviation (for the 18z tafs through 18z Tuesday afternoon)
issued at 1110 am mdt Mon sep 25 2017
MVFR conditions will prevail through this evening as light
easterly upslope flow continues, with areas of ifr until about
19z. Some heavier showers may push off the foothills and over the
area airports between 21-00z, helping to raise ceilings a bit. There
may be some clearing after 06z tonight, which may allow some
patchy fog to develop Tuesday morning. So there is a chance of
MVFR or ifr conditions for Tuesday morning as well.

Bou watches warnings advisories
None.

Update... Kriederman
short term... Gimmestad
long term... Cooper
aviation... Gimmestad kriederman


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver, Denver International Airport, CO8 mi42 minNE 610.00 miMostly Cloudy53°F42°F66%1015.4 hPa
Buckley Air Force Base Airport, CO15 mi97 minN 410.00 miOvercast47°F46°F98%1016.4 hPa
Denver Nexrad, CO16 mi48 minN 610.00 miMostly Cloudy52°F44°F77%1019 hPa
Erie Municipal Airport, CO16 mi37 minENE 410.00 miOvercast53°F42°F68%1020 hPa
Broomfield / Jeffco, CO19 mi48 minE 320.00 miMostly Cloudy52°F41°F67%1018.6 hPa

Wind History from DEN (wind in knots)
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Last 24hrE12E14E12E11NE12E9NE8N7N6N6N7N9NE8E5NW11N7N8N5N8NE7N7NE7NE7NE6
1 day agoN9N11N16N15N17N13NE11NE8NE6E8NE3CalmCalmCalmCalmE3SE3CalmCalmNE8NE7NE11E12E13
2 days agoNW11NW22
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N17NW10NW13NW12N11N7NE9NW7NW7N6N4N7N7NE8N6NE5E3SE7E3N10

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 (16,3,4,5)
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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.