Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Mammoth Lakes, CA

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 7:47PM Saturday April 29, 2017 4:18 AM PDT (11:18 UTC) Moonrise 8:59AMMoonset 11:36PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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 Mammoth Lakes, CA
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location: 37.67, -118.99     debug


Area Discussion for - San Joaquin Valley/Hanford, CA
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Fxus66 khnx 291030
afdhnx
area forecast discussion
national weather service san joaquin valley - hanford ca
330 am pdt Sat apr 29 2017

Synopsis
Gusty downsloping winds are expected over parts of the sierra and
foothills this early Saturday morning. Lighter winds, warming
temperatures and dry weather will then prevail this weekend into
early next week as high pressure strengthens over the region.

Discussion
Strong winds lingering over the region this morning as Friday's
disturbance continues to move eastward. Before pushing eastward,
the disturbance managed to produce wind gusts in excess of 40 mph
across the san joaquin valley Friday afternoon. At this point,
strong winds will be confined to higher elevations, mainly the
sierra nevada, during the early morning hours this Saturday. Short
range model upper-air analysis is showing 60-70 knot
northwesterly winds which will diminish to lower values during the
afternoon and evening hours. Therefore, support for this
morning's winds are mainly surface based as surface pressure
gradients remain tight from northern nevada to south-central
california. Yet, as the air-mass continues to modify, pressure
gradients will relax and allow for lighter winds tonight and the
rest of the weekend.

Beyond the current wind situation, the next major weather feature
to affect the region will be an east-pac high. Initially,
temperatures will see a slow rise during the next few days. This
slow rise is due mainly to the upper level disturbances keeping
the ridge at bay. Models show the disturbances riding over the
ridge and through the pacific-northwest through at least Monday.

By Tuesday, the last weak disturbance pushes east and toward the
northern rockies as the ridge begins to amplify. At that point,
temperatures will begin a more significant rise to well above
climatology. Longer range models show the ridge pattern shifting
eastward during the week. By Wednesday, models prog the placement
of the ridge axis over the west coast as warming peaks out.

Standardized anomaly chart support this trend to well above
seasonal norms as they place the region under 2 positive standard
deviations during the mid-week period. Therefore, confidence is
high in raising temperatures some 10 to 15 deg-f above normal
before another disturbance approaches the region.

While models do agree on the development of a trof pattern latter
in the forecast periods, confidence in the timing is very low.

Will not introduce any mention of precipitation during the week
while uncertainty remains high. Currently, the ecmwf/canadian and
navy's nogaps show the faster solutions while GFS lags behind.

Modified the weather forecast grids to reflect a more unsettled
pattern toward the end of the forecast cycle. At the moment, will
opt for the ECMWF solution of introducing the influence of the
disturbance during the day on Friday, with its passage during the
evening and into Saturday morning. Again, will wait for better
consensus of the longer range models before the any mention of
precipitation.

Aviation
Surface wind gusts above 35kt are expected across the foothills
and higher elevations of the sierra nevada through 18z Saturday.

Otherwise,VFR conditions and light winds will prevail across the
central ca interior during the next 24 hours.

Air quality issues
None.

Certainty
The level of certainty for days 1 and 2 is high.

The level of certainty for days 3 through 7 is medium.

Certainty levels include low... Medium... And high. Please visit


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mammoth Yosemite Airport, CA9 mi44 minW 510.00 miFair22°F12°F67%1023.4 hPa

Wind History from MMH (wind in knots)
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Last 24hrW8W8NW4NW4NW5NW6N15
G20
N14
G21
N11
G18
N19
G24
N18
G21
N18
G26
NW15
G21
NW14
G21
NW14
G19
NW6N6CalmNW5W6W3CalmNW3N4
1 day agoNW18
G25
NW12
G20
NW13
G18
N10
G17
N11W14
G27
W20
G29
W16
G24
W13
G23
W26
G30
W21
G33
W20
G26
W21
G37
W18
G31
W14
G27
W18
G21
NW12N13W11W11W8W6W6W9
2 days agoW9NW9N8
G15
NW7NW15
G20
NW14
G25
W18
G31
SW22
G36
W24
G33
W26
G33
W25
G30
W28
G34
W27
G37
W20
G31
SW27
G38
W27
G33
W19
G27
NW14
G29
NW21
G24
NW17
G22
NW14
G21
NW17
G25
NW17
G22
NW18
G26

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
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Joaquin Valley/Hanford, CA (7,2,3,4)
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Ground Weather Radar Station San Joaquin Valley, CA
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weather_mapweather_map weather_map

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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.