Saturday, December16, 2017 L-36.com


Marine Weather and Tides
Imperial Beach, CA

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 6:42AMSunset 4:46PM Saturday December 16, 2017 10:49 AM PST (18:49 UTC) Moonrise 6:11AMMoonset 5:00PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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PZZ750 Coastal Waters From San Mateo Point To The Mexican Border And Out To 30 Nm- 228 Am Pst Sat Dec 16 2017
Today..Wind sw 10 kt with gusts to 15 kt... Becoming S to 10 kt in the afternoon. Wind waves 2 ft or less. SWell W 3 to 5 ft at 15 seconds. Slight chance of showers in the afternoon.
Tonight..Wind ne to 10 kt. Gusts to 15 kt after midnight. Wind waves 2 ft or less. SWell W 4 to 6 ft at 12 seconds.
Sun..Wind ne 10 to 15 kt...becoming nw in the afternoon. Wind waves 3 ft in the morning...becoming 2 ft or less. SWell W 2 to 5 ft at 13 seconds.
Sun night..Wind ne 10 kt with gusts to 15 kt. Wind waves 2 ft or less. SWell W 2 to 3 ft at 12 seconds.
Mon..Wind E to 10 kt...becoming W in the afternoon. Gusts to 15 kt. Wind waves 2 ft or less. SWell W 1 to 2 ft at 12 seconds.
Mon night..Wind nw 10 kt with gusts to 15 kt in the evening... Becoming variable less than 10 kt. Wind waves 2 ft or less. SWell W 1 to 2 ft.
Tue..Wind variable less than 10 kt...becoming W 10 kt in the afternoon. Wind waves 2 ft or less. SWell W 1 to 2 ft.
Tue night..Wind variable less than 10 kt. Wind waves 2 ft or less. SWell W 1 to 2 ft.
Wed..Wind variable less than 10 kt...becoming W 10 kt in the afternoon. Wind waves 2 ft or less. SWell W 1 to 2 ft.
Wed night..Wind W 10 kt. Gusts to 15 kt in the evening. Wind waves 3 ft in the evening...becoming 2 ft or less. SWell W 1 to 4 ft.
PZZ700 228 Am Pst Sat Dec 16 2017
Synopsis for the far southern california coast.. At 2 am, a 1035 mb high was 500 nm west of eureka, california, and a 1007 mb low was near death valley. Onshore flow will occur today under a trough of low pressure, but then offshore flow will return tonight through Tuesday except for northwest winds during the afternoons. Weak onshore flow will return Wednesday.

7 Day Forecast for Marine Location Near Imperial Beach city, CA
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location: 32.53, -117.14     debug


Area Discussion for - San Diego, CA
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Fxus66 ksgx 161612
afdsgx
area forecast discussion
national weather service san diego ca
811 am pst Sat dec 16 2017

Synopsis
A trough of low pressure moving through southern california today
will bring stronger onshore flow with cooling... More clouds... And
perhaps a few showers over western san diego county. Gusty westerly
winds will turn back offshore on Sunday as surface high pressure
builds south over the great basin. Very dry air will return, along
with strong northeast wind gusts through and below some passes and
canyons. For Wednesday and Thursday, another low pressure system
moving through the great basin will bring strong onshore flow again,
with cooling, more clouds, and higher humidity. Winds will be strong
and gusty over the mountains and deserts. Moderate to strong
offshore flow may return again late Thursday into Friday.

Discussion For extreme southwestern california including orange...

san diego... Western riverside and southwestern san bernardino
counties...

skies were mostly cloudy across the forecast area this morning as a
sheet of high clouds drifted from NW to SE above lower marine clouds
surging inland. Surface pressure gradients were weak but showed
strong onshore trends. A few spots in the mountains already had sw
wind gusts of 25 mph or more, however most areas reported light
winds. Dewpoints remained very low, even at the coast. A narrow mid-
level front with moderate radar returns was moving from NW to se
across the area with a few sprinkles snow showers. The higher mtn
resorts have indicated some trace amounts of snow from this early
today. The 12z miramar sounding indicated cooling with increasing
westerly winds at 25 to 50 kts, but still exceedingly dry.

Expecting the onshore flow today will boost dewpoints, resulting in
more comfortable rh values through tonight. We are also watching for
possible convective development over the ca bight as mid-level cold
advection and increasing spin aloft spike instability. Most of the
model suite this morning all show some precip developing today over
the water. San diego proper will have the best chance for measuring
some rainfall if this activity develops. Otherwise the forecast is
on track.

From previous discussion...

Short term (today through Monday)
A trough of low pressure is moving through southern california
early this morning. This will bring stronger onshore flow with
significant cooling... More clouds... And gusty southwest to west
winds in the mountains and deserts. For inland coastal areas... The
valleys... And the mountains... High temperatures today will be 15
to 20 degrees cooler than on Friday... 10 to 15 degrees cooler
towards the coast and in the upper deserts... And 5 to 10 degrees
cooler in the lower deserts. A brief return of lower level
moisture will bring slight chances for light showers... Mainly for
central and southern coastal areas of san diego for late morning
into the afternoon with any rainfall a few hundredths of an inch
at most.

The flow will turn offshore for tonight and Sunday with stronger
and gusty north to northeast winds developing along and below
coastal mountain slopes and below passes and canyons for portions
of san bernardino... Riverside... And orange counties for late
tonight into Sunday morning with gusts to 50 mph and isolated
gusts to 60 mph. Weaker northeast winds will spread into the
mountains and inland valleys in san diego county on Sunday. Winds
will weaken and become more localized for Sunday night and
Monday. High temperatures for coastal and valley areas will warm
on Sunday while the mountains and deserts continue to cool. The
warming will spread inland on Monday.

Long term (Tuesday through Friday)
Warmer with weaker winds for Tuesday with weakening high pressure
aloft over california. A low pressure system off the pacific
northwest coast on Tuesday... Will move into the pacific northwest
early Wednesday... And into the great basin late Wednesday and
Wednesday night. For southern california... This will bring
stronger onshore flow with cooling for Wednesday into
Thursday... A possible return of the marine layer with night and
morning coastal low clouds and fog... And strong gusty west winds
in the mountains and deserts for Wednesday and Wednesday night.

For Thursday into Friday... Upper level low pressure to the east
and surface high pressure over the great basin will bring periods
of moderate to strong northeast winds. There remain differences
with the location and strength of that upper level low pressure
among the global models along with the duration and strength of
the offshore flow. The ECMWF is weaker with the offshore flow
along with lesser duration of the offshore flow. The ECMWF also
advertises deamplification of the high amplitude pattern across
the mid latitudes of the eastern pacific and north america for
early the week of christmas. In between for next weekend... The
differences across southern california are significant with some
global models maintaining closed upper level low pressure over
the southwest states and the ECMWF developing upper level high
pressure from the subtropical eastern pacific into california.

Aviation
161600z... Areas of stratus with bases 1200-1800 ft msl and tops to
4000 ft. Stratus is already clearing into orange county and a slow
clearing trend will continue from NW to SE through early this
evening. A few -shra is possible near kcrq and especially ksan this
afternoon.

After 05z tonight, most areas will be clear, but locally gusty
northeast winds 15-30 knots with gusts 35-45 knots will develop
along southwest mountain slopes and through below passes and
canyons, continuing Monday morning. Lighter winds will occur in san
diego county.

Marine
Combined seas could reach 8-9 feet in the outer waters tonight, just
below small craft advisory criteria, due to a wnw swell around 12
seconds. Winds will increase out of the NE tonight with the highest
winds of 15-20 kt over the offshore waters towards san clemente
island.

Fire weather
Onshore flow will bring increasing rh and gusty westerly winds over
the mts deserts today. Offshore flow will return late tonight and
Sunday as surface high pressure builds south over the great basin.

Northeast winds 15 to 30 mph with gusts 40 to locally 55 mph are
expected to return across portions of san bernardino... Riverside...

and orange counties late tonight. Strongest winds are expected on
Sunday morning. Farther south across san diego county... Winds will
generally be weaker with peak gusts 35 to 40 mph on the wind-prone
coastal slopes on Sunday, peaking Sunday evening. Rh will drop to
around 15% on Sunday resulting in marginal red flag conditions for
several hours, mainly northern areas. Rh values will drift higher
Sunday evening into Monday as the winds ease.

Another round of moderate to strong northeast winds is possible for
Thursday into Friday with low inland humidity.

Skywarn
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

Sgx watches warnings advisories
Ca... Fire weather watch from Sunday morning through Sunday evening
for san diego county inland valleys-san diego county
mountains-including the palomar and descanso ranger
districts of the cleveland national forest.

Red flag warning from 8 am to 8 pm pst Sunday for orange county
coastal areas-orange county inland areas-riverside county
mountains-including the san jacinto ranger district of the
san bernardino national forest-san bernardino county
mountains-including the mountain top and front country
ranger districts of the san bernardino national forest-san
bernardino and riverside county valleys -the inland empire-
san gorgonio pass near banning-santa ana mountains-
including the trabuco ranger district of the cleveland
national forest.

Pz... None.

Public... Jad 17
fire weather... Jad
aviation marine... Gregoria


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIXC1 - Tijuana River Reserve, CA 3 mi64 min SSW 5.1 60°F 1009 hPa
SDBC1 - 9410170 - San Diego, CA 13 mi49 min 64°F1007.7 hPa (-1.0)
46232 - Point Loma South, CA (191) 15 mi68 min 64°F6 ft
LJPC1 - La Jolla, CA (073) 24 mi89 min SE 4.1 3 ft
LJAC1 - 9410230 - La Jolla, CA 24 mi49 min SSE 5.1 G 7 62°F 67°F1006.6 hPa (-0.9)
46254 24 mi91 min 62°F3 ft
46258 24 mi49 min 62°F4 ft
46225 - Torrey Pines Outer, CA (100) 31 mi58 min 62°F4 ft
46224 - Oceanside Offshore, CA (045) 48 mi49 min 62°F3 ft
46086 - San Clemente Basin 48 mi59 min W 7.8 G 9.7 61°F 63°F6 ft1006.8 hPa (-1.1)

Wind History for USS MIDWAY South Navy Pier, San Diego, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Imperial Beach Naval Outlying Field - Ream Field, CA4 mi1.9 hrsSW 88.00 miMostly Cloudy60°F52°F75%1008.6 hPa
San Diego, Brown Field Municipal Airport, CA9 mi56 minS 79.00 miPartly Cloudy60°F53°F78%1007.8 hPa
San Diego, North Island, Naval Air Station, CA12 mi57 minS 810.00 miMostly Cloudy62°F55°F80%1006.9 hPa
San Diego, San Diego International-Lindbergh Field, CA14 mi58 minSSE 109.00 miMostly Cloudy61°F55°F81%1007.6 hPa
San Diego, Montgomery Field, CA21 mi56 minSE 97.00 miMostly Cloudy62°F52°F70%1007.1 hPa
Gillespie Field Airport, CA23 mi62 minN 010.00 miMostly Cloudy52°F24°F35%1007.8 hPa
San Diego, Miramar MCAS/Mitscher Field Airport, CA24 mi54 minSE 89.00 miMostly Cloudy64°F52°F65%1006.6 hPa

Wind History from NRS (wind in knots)
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Last 24hrN4N7NW10NW10NW10NW8NW4CalmE5E3NE4NE5E9CalmS5E5E7NE3E7E3E7E4SW8S6
1 day agoW5W6W7NW6NW5NW4SW4S4CalmE6NE7E9E10E7NE6E9NE8NE6NE45E8E7N4N6
2 days agoW6W6W7W5CalmW4W3CalmS6N4CalmN3E5E5E8E5E7NE5E5E4E3E7E5W5

Tide / Current Tables for Imperial Beach, California
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Imperial Beach
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Sat -- 01:25 AM PST     1.62 feet Low Tide
Sat -- 05:11 AM PST     Moonrise
Sat -- 06:43 AM PST     Sunrise
Sat -- 07:45 AM PST     5.98 feet High Tide
Sat -- 02:42 PM PST     -0.53 feet Low Tide
Sat -- 04:00 PM PST     Moonset
Sat -- 04:44 PM PST     Sunset
Sat -- 09:02 PM PST     3.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.71.72.23.14.25.15.865.54.43.11.60.4-0.4-0.5-0.10.81.92.93.63.93.73.1

Tide / Current Tables for San Diego Bay Entrance, California Current
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San Diego Bay Entrance
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Sat -- 01:54 AM PST     0.00 knots Slack
Sat -- 05:11 AM PST     Moonrise
Sat -- 05:17 AM PST     1.55 knots Max Flood
Sat -- 06:44 AM PST     Sunrise
Sat -- 08:07 AM PST     -0.00 knots Slack
Sat -- 11:32 AM PST     -2.26 knots Max Ebb
Sat -- 03:18 PM PST     0.00 knots Slack
Sat -- 04:00 PM PST     Moonset
Sat -- 04:44 PM PST     Sunset
Sat -- 06:16 PM PST     1.47 knots Max Flood
Sat -- 09:15 PM PST     -0.00 knots Slack
Sat -- 11:44 PM PST     -1.10 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1-0.60.10.71.31.51.40.90.1-0.9-1.7-2.2-2.2-1.8-1.1-0.20.61.21.51.40.90.2-0.5-1

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 Southwest    EDIT
Geos

Wind Forecast for San Diego, CA (13,3,4,5)
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Ground Weather Radar Station San Diego, CA
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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.