Thursday, October19, 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 6:55AMSunset 6:11PM Thursday October 19, 2017 2:22 AM PDT (09:22 UTC) Moonrise 6:43AMMoonset 6:33PM Illumination 1% Phase: Waning Crescent; Moon at 29 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- 152 Am Pdt Thu Oct 19 2017
.small craft advisory for winds in effect from this evening through late Friday night...
Today..Wind variable less than 10 kt...becoming W 10 kt with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 7 seconds and sw 3 ft at 15 seconds.
Tonight..Wind W 10 to 15 kt with gusts to 20 kt. Wind waves 2 ft or less...becoming 3 to 4 ft after midnight. Mixed swell W 2 to 3 ft at 7 seconds and sw 2 to 3 ft at 14 seconds. Patchy drizzle after midnight.
Fri..Wind W 10 to 20 kt with gusts to 25 kt. Wind waves 4 ft. Mixed swell W 4 to 5 ft at 7 seconds and sw 2 ft at 14 seconds. Patchy drizzle in the morning.
Fri night..Wind nw 10 to 15 kt with gusts to 20 kt. Wind waves 3 to 4 ft in the evening...becoming 2 ft or less. Mixed swell W 4 to 5 ft at 17 seconds and sw 1 to 2 ft at 13 seconds.
Sat..Wind E to 10 kt...becoming nw in the afternoon. Gusts to 20 kt. Wind waves 2 ft or less. Mixed swell W 3 to 5 ft at 16 seconds and sw 1 ft at 13 seconds.
Sat night..Wind N 10 to 15 kt with gusts to 20 kt. Wind waves 2 ft or less. Mixed swell W 3 to 4 ft and S 1 ft.
Sun..Wind ne 10 kt...becoming nw with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 1 to 2 ft.
Sun night..Wind N 10 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft.
Mon..Wind ne 10 kt...becoming W with gusts to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 ft and S 2 ft.
Mon night..Wind N 10 kt. Gusts to 15 kt in the evening. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft.
PZZ700 152 Am Pdt Thu Oct 19 2017
Synopsis for the far southern california coast..At 1 am, a 1021 mb high was about 760 nm west southwest of san diego, and a 1012 mb low was over the southern california bight. Mostly weak onshore flow will previal through today, then a low pressure system could bring wind gusts from the west- northwest to 25 knots tonight and Friday. Offshore flow will develop over the weekend. An elevated short period northwest swell could bring rough seas Friday and Saturday.

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 190418
afdsgx
area forecast discussion
national weather service san diego ca
917 pm pdt Wed oct 18 2017

Synopsis
A deepening trough over the west will bring a cooling trend and a
deepening marine layer through Friday. Expect night and morning
marine layer clouds over the coast and western valleys tonight and
Thursday morning and then over the coast, valleys and coastal
slopes with possible drizzle Thursday night and Friday morning.

Locally strong and gusty west winds also likely in the mountains
and deserts Thursday and Friday. Santa ana winds and a building
strong ridge of high pressure will bring significant warming and
drying to the region Saturday through Monday. Hot conditions
possible all the way to the coast Sunday and Monday, with weather
almost as hot on Tuesday.

Discussion For extreme southwestern california including orange...

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

No changes were made to the forecast this evening. The previous
forecast discussion remains valid, below...

afternoon water vapor satellite imagery shows a weak short-wave
trough moving east over southern nevada san bernardino county with
a few high clouds over the deserts associated with this trough.

Humidity observations at the coast indicate dew points in the
50s 60s, which shows that the marine layer has finally returned.

The 12z miramar sounding shows a surface based marine layer
inversion and a moist layer from around 700 mb to 400 mb. Pressure
gradients continue to trend onshore this morning, with the san
diego to thermal gradient up to 4.5 mb onshore, while 24 hours ago
it was only 2.3 mb onshore. With the return of onshore flow and
large scale trough deepening over the pacific northwest,
temperatures at 1 pm are around 5-10 degrees lower than 24 hours
ago, although highs today will still be several degrees above
normal. Local WRF shows that marine layer stratus will likely
develop and deepen tonight in the coast and western valleys, with
help from a coastal eddy which appears to already be developing
according to coastal wind observations.

The cooling trend will continue through Friday as the trough
continues to deepen and move inland, with possibly enough lift and
moisture for some drizzle and or light showers over and west of
the coastal slopes Friday morning. Expect highs 5-10 degrees
below normal by Friday. Onshore flow will strengthen as well, with
onshore pressure gradients forecast to reach around 10 mb from san
diego to las vegas on Friday, so expect west winds gusting 35-45
mph with local gusts to 50 mph in the mountains and deserts
Thursday and Friday. The marine layer will continue to deepen as
well (up to 4000-4500 ft msl), with stratus filling the coastal
basin and likely moving into the passes and coastal slopes
Thursday night Friday morning and again Friday night before
offshore winds clear clouds out from the north Saturday morning.

On Saturday, surface high pressure over the great basin will build
in the wake of the trough that moves over that area. This will
create offshore pressure gradients at around 7 mb from san diego
to tonopah, resulting in weak santa ana winds that day. A building
ridge from the southwest, in addition to the santa ana winds, will
result in significant warming that day in the coast and valleys,
as well as clearing out the marine layer. The ridge will will
continue to build over the region Sunday through Monday, becoming
anomalously strong by Monday with 500 mb heights reaching 596 dm
according to the ECMWF and canadian models (gfs is weaker at
around 595 dm). Although they do not look strong at the moment
(offshore pressure gradients from san diego to tonopah increasing
to 10 mb with 850 mb winds of only 10-15 kt), the santa ana winds
will continue as well, bringing hot weather all the way to the
coast. The ECMWF also shows 850 mb temperatures reaching 24 deg c
on Monday, which translates to 101+ degree surface temperatures
west of the mountains. Once again, the GFS isn't as warm, showing
850 mb temperatures around 23 deg c. Although we start to trend
back onshore on Tuesday, the ridge could be almost as strong
which means that inland areas may be almost as hot as they were on
Monday, and in the case of the mountains and deserts they may be
even hotter.

Aviation
190330z... Coast valleys... Low clouds will continue to form along the
coast and over the western valleys through 15z Thursday. Look for
ceilings near 1,000 ft msl and tops around 1,600 ft msl. Reduced
visibility of 1 sm or less is possible near higher coastal and
valley terrain. Clearing is expected between 16z and 18z Thursday,
with sct AOA 20,000 ft msl and light winds between 18z Thursday and
00z Friday. Low clouds will return to the coast after 00z Friday,
with bases near 2000 ft msl. Forecast confidence is moderate.

Mountains deserts... Sct AOA 20,000 ft msl, unrestricted visibility,
and light winds will continue through 22z Thursday. Westerly winds
will increase after 22z, resulting in mountain wave activity over
and east of the desert slopes, areas of llws and moderate
up downdrafts. Patchy bldu is also possible. Kpsp and ktrm will see
increasing NW winds after 22z. Forecast confidence is high.

Marine
Quiet conditions over the coastal waters on Thursday will give way
to more unsettled weather Friday as a front traverses the region.

Northwest winds will increase to 15-25 kt Friday, and be accompanied
by combined seas of 5-9 ft. Highest seas and strongest winds can be
expected near and south of san clemente island. Conditions will
slowly improve on Saturday, with light winds and tamer seas forecast
for early next week.

Beaches
A 2-3 ft 14-16 second south southwest swell will continue to impact
beaches north of solana beach through Thursday. This will produce
elevated surf of 3-5 ft with sets to 6 ft, along with strong rip and
longshore currents. A beach hazard statement remains in effect
through Thursday evening to account for these conditions. The
south southwest swell will diminish Thursday night, and be replaced
by an elevated short period northwest swell Friday and Saturday.

Fire weather
Increasingly cool and more humid today through Friday as a trough
moves in over the west. Gusty westerly onshore winds in mountains
and deserts Thursday and Friday, with gusts 30-40 mph and local
50 mph.

Weak to moderate strength santa ana winds likely Saturday through
at least Monday, with day-time humidity falling down to at or
below 10 percent Sunday and Monday (with very poor overnight
recoveries) along with hot conditions and gusty northeast winds
(15-25 mph gusting 30-40 mph and locally 50 mph). This would
likely result in critical fire weather conditions through and
below the mountain passes and into the coastal slopes and
foothills Sunday through Monday, and possibly into Tuesday as
well. Also, late Saturday there could be critical fire weather
conditions near the cajon pass.

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

Sgx watches warnings advisories
Ca... Beach hazards statement through Thursday evening for orange
county coastal areas-san diego county coastal areas.

Pz... None.

Public fire weather... Harrison jmb
aviation marine beaches... Albright


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIXC1 - Tijuana River Reserve, CA 3 mi97 min SW 1.9 65°F 1014 hPa63°F
SDBC1 - 9410170 - San Diego, CA 13 mi52 min 74°F1013.5 hPa
46232 - Point Loma South, CA (191) 15 mi41 min 71°F5 ft
LJPC1 - La Jolla, CA (073) 24 mi62 min S 2.9 2 ft
LJAC1 - 9410230 - La Jolla, CA 24 mi52 min SSE 1.9 G 4.1 69°F 71°F1012.5 hPa
46254 24 mi94 min 69°F2 ft
46258 24 mi54 min 71°F4 ft
46225 - Torrey Pines Outer, CA (100) 31 mi61 min 69°F4 ft
46224 - Oceanside Offshore, CA (045) 48 mi52 min 71°F4 ft
46086 - San Clemente Basin 48 mi92 min W 14 G 18 67°F 70°F5 ft1012.9 hPa (+0.0)

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 mi26 minS 39.00 miOvercast67°F62°F84%1013.1 hPa
San Diego, Brown Field Municipal Airport, CA9 mi29 minSW 42.00 miFog/Mist61°F61°F100%1012.7 hPa
San Diego, North Island, Naval Air Station, CA12 mi90 minSSW 37.00 miMostly Cloudy68°F64°F90%1012.7 hPa
San Diego, San Diego International-Lindbergh Field, CA14 mi31 minSSW 47.00 miMostly Cloudy69°F63°F81%1013.3 hPa
San Diego, Montgomery Field, CA21 mi29 minSSW 38.00 miOvercast70°F62°F76%1012.8 hPa
Gillespie Field Airport, CA23 mi27 minN 09.00 miOvercast64°F60°F88%1013.2 hPa
San Diego, Miramar MCAS/Mitscher Field Airport, CA24 mi87 minSSW 56.00 miFog/Mist70°F64°F82%1012.4 hPa

Wind History from NRS (wind in knots)
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Last 24hrE3E3E4E7E7CalmSW6SW13
G17
SW13SW11SW9W12W9SW9SW8SW7S4SW5CalmW4S3CalmS6S3
1 day agoNE5NE6N7NE4NE4E7E7SW4W8W7W6W6W11W9W5S3S4E4NE3CalmE5SW4S4SW5
2 days agoNE3E6E8NE6NE5NE6NE5NE5NW9W8W10NW13W6W94W8SW3SW3SE4E7E5NE5NE5NE4

Tide / Current Tables for Imperial Beach, California
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Imperial Beach
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Thu -- 03:23 AM PDT     0.50 feet Low Tide
Thu -- 06:43 AM PDT     Moonrise
Thu -- 06:55 AM PDT     Sunrise
Thu -- 09:39 AM PDT     5.90 feet High Tide
Thu -- 12:12 PM PDT     New Moon
Thu -- 04:01 PM PDT     -0.05 feet Low Tide
Thu -- 06:10 PM PDT     Sunset
Thu -- 06:33 PM PDT     Moonset
Thu -- 10:10 PM PDT     4.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.42.21.10.50.61.32.53.855.85.95.34.12.71.30.3-0.10.31.12.33.54.44.84.6

Tide / Current Tables for San Diego Bay Entrance, California Current
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San Diego Bay Entrance
Click for Map
Thu -- 12:48 AM PDT     -1.90 knots Max Ebb
Thu -- 03:55 AM PDT     0.00 knots Slack
Thu -- 06:43 AM PDT     Moonrise
Thu -- 06:56 AM PDT     Sunrise
Thu -- 07:04 AM PDT     1.82 knots Max Flood
Thu -- 09:59 AM PDT     -0.00 knots Slack
Thu -- 12:12 PM PDT     New Moon
Thu -- 01:08 PM PDT     -2.20 knots Max Ebb
Thu -- 04:31 PM PDT     0.00 knots Slack
Thu -- 06:10 PM PDT     Sunset
Thu -- 06:33 PM PDT     Moonset
Thu -- 07:33 PM PDT     1.68 knots Max Flood
Thu -- 10:30 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.7-1.9-1.5-0.80.10.91.61.81.61-0-1-1.8-2.2-2-1.4-0.50.41.21.61.61.20.5-0.5

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of Southwest    EDIT
Geos

Wind Forecast for San Diego, CA (5,6,7,8)
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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.