Friday, October23, 2020
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Marine Weather and Tides
Mono City, CA

Version 3.4
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8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:17AMSunset 6:11PM Friday October 23, 2020 7:36 PM PDT (02:36 UTC) Moonrise 2:35PMMoonset 12:00AM Illumination 48% Phase: First Quarter Moon; Moon at 7 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 Mono City, CA
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location: 38.11, -119.09     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 232155 AFDREV

Area Forecast Discussion National Weather Service Reno NV 255 PM PDT Fri Oct 23 2020

SYNOPSIS.

More seasonable temperatures are expected through Saturday. A strong cold front will move through Saturday night into Sunday bringing well below average temperatures along with gusty north to east winds. Stronger winds will persist into Monday in the Sierra causing Fire Weather concerns for the Sierra. Hard freezes are certain for all valleys Monday and Tuesday mornings.

DISCUSSION.

No major shifts occurred in the thinking or messaging for this weekend's strong cold front. Winds Sunday through Monday will bring Fire Weather concerns back to the region, and temperatures will be anomalously cold for October Sunday night through Tuesday. Otherwise, some minor adjustments were made based on latest model guidance. Most notably, frontal passage timing has increased by a couple hours which has implications for duration of frontal wind gusts and precipitation amounts.

Winds * A strong cold front continues to be projected to move through the region Saturday afternoon and evening with initially weak to jet support and a lag in colder temperatures. Gusts Sunday will not be overwhelming, generally 20-30 mph. While this isn't the greatest setup for strong winds along the frontal boundary itself, upper level winds ramp up as a strong NE-SW oriented 120kt jet maximum moves drops southward out of the Rockies of Montana/Idaho. This is translating to 50kt winds at 700 mb maximizing Sunday night. As such, a westerly directed downsloping event is expected. Gusts across the Tahoe Basin will generally be 25-35 mph out of the east with strongest winds along the west-shore, around 50 mph along the west slopes of Tahoe extending northward along terrain through around Lassen Peak, and 70+ mph over the Sierra crest. With the state of the vegetation and timber, expect fire weather concerns with these wind speeds; see the fire weather section below for more details.

Expect some limb damage for Sierra locations and around a 10-15% chance of some trees being blown down. Easterly wind events are not completely anomalous, but happen with enough rarity that root systems for trees are not as resilient to this flow pattern. Hazardous lake conditions can be expected for Lake Tahoe Sunday evening through Monday as well, especially from mid lake to the western shore. Finally, blowing dust will be likely Sunday through Monday for western Nevada locations. This dust could degrade air quality like it did Thursday. Temperatures * Hard freezes are on tap for the entire region Sunday night through Tuesday morning. Overnight lows for western Nevada will range from the upper teens to mid 20s with single digits and low teens for Sierra valleys. This will be an issue for sensitive populations that may be under-prepared for such an abrupt shift in temperatures. Also, if you haven't done so, winterizing of irrigation systems should be finish by tomorrow. I'll be getting one last watering in before these cold temperatures finish off my garden.

Precipitation * Very minimal precipitation will occur with this system. Best chances for a snow flurry and up to 0.05" of liquid equivalent remains along upslope areas in the Sierra of Mono County. The higher elevations around Tahoe could see a flurry, but liquid equivalent has been reduced to 0.01" or less this forecast cycle due to a faster passage of the cold front. Cloud cover was increased behind the front through as upslope flow should keep the Sierra Front at least partly cloudy from Interstate 80 through Mono County. Smoke * Smoke, and associated air quality issues, will continue to be a factor for southern Mono County through at least Saturday when the cold front pushes through. Smoke will push westward by Sunday allowing for improving air quality and a much deserved break from these conditions.

Temperatures will warm back to more seasonable levels mid next week onward as offshore ridging persists and begins to move inland. Boyd

AVIATION.

MMH continues to see periods of MVFR conditions due to smoke layers associated with the Creek Fire. Expect the smoke layer to lower overnight as winds drop and more smoke filters through low points over the Sierra crest. IFR conditions will be possible again Saturday morning. Smoke will clear from the MMH area late Saturday as a cold front switches winds and pushes smoke west of the Sierra crest.

Elsewhere, conditions will remain VFR and dry through Saturday evening. Cloud cover will increase Saturday night and a few flurries will be possible over the Sierra and upslope areas along the Carson Range. The biggest flight weather concern will be later Sunday as a strong jet creates turbulent conditions over the Sierra with winds downsloping towards central California. LLWS will be possible for Sierra terminals along the cold frontal boundary and as easterly gradient winds increase Sunday night. Boyd

FIRE WEATHER.

Main change today was to upgrade the Fire Weather Watches to Red Flag Warnings in the Tahoe Basin along the Sierra Crest north into western Lassen County for Sunday afternoon through Monday afternoon. For areas near the Sierra Crest this will be the strongest wind event of the season. The strongest winds may not ramp until the late evening hours in the Tahoe Basin with the strongest winds expected overnight.

Very strong cold front moving through the region Saturday night into Sunday will create a strong temperature and pressure gradient along the Sierra crest with strong downsloping winds along the west slope of the Sierra. For the eastern side of the Sierra crest, the most widespread effects are expected from the Tahoe Basin north into western Lassen County. Wind gusts are expected to increase to 30 to 35 mph in the lower elevations with gusts of 40 to 50 mph along the midslopes and wind prone areas. The strongest winds, right along the Sierra Crest, could gust to 70-80+ mph. The Sierra crest along Alpine and Mono Counties are also expected to be very gusty with this event, but the worst conditions are expected to be more confined to areas right along the crest.

Very dry air associated with this cold front will create poor recoveries in the higher elevations with some areas near the crest only seeing a max RH of around 30% Sunday night with drier air continuing to move into the region on Monday. Humidities on Monday will be in the low teens and single digits with widespread poor recoveries on Monday night. Some areas in Mono and Mineral counties could see isolated critical conditions on Monday behind the cold front, but most of the coverage for Monday is expected to be farther east and south. -Zach

REV Watches/Warnings/Advisories.

NV . CA . Red Flag Warning from 5 PM Sunday to 5 PM PDT Monday CAZ271-272.



For more information from the National Weather Service visit . http://weather.gov/reno


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mammoth Yosemite Airport, CA36 mi61 minN 010.00 miOvercast46°F19°F34%1020.7 hPa

Link to 5 minute data for KMMH

Wind History from MMH (wind in knots)
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Last 24hrW9W10W8W7W12W10W3N3N3CalmCalmCalmCalmCalmSE5SE6SE3E6E6E7E9E8SW3Calm
1 day agoW4CalmNW3N4CalmCalmCalmN4NW4CalmCalmN5N3SE3SE7SE4SE7E8SE7E9SE8E5SE6Calm
2 days agoN4N3N3N4CalmNW4NW3N3N3CalmCalmN4CalmSE4CalmSE4S3SE5SE6SE8SE8E5S3Calm

Tide / Current Tables for
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Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Ground Weather Radar Station Reno, NV
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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 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 numerous 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.