Marine Weather and Tides
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 7:02AM||Sunset 5:20PM||Wednesday January 27, 2021 7:03 PM PST (03:03 UTC)||Moonrise 5:13PM||Moonset 7:31AM||Illumination 100%|
7 Day Forecast for Marine Location Near Mammoth Lakes, CAHourly EDIT Help
Area Discussion for - San Joaquin Valley/Hanford, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS66 KHNX 280027 AAA AFDHNX
Area Forecast Discussion UPDATED National Weather Service Hanford CA 425 PM PST Wed Jan 27 2021
. Update to Air Quality Issues Section .
SYNOPSIS. A potent storm will continue over the region. Heavy lower elevation rain along with heavy snow over the mountains above 5,000 feet will be observed during the storms passage. The storm will persist into Friday when precipitation will begin to taper off. Very strong winds will accompany this storm and buffet parts of the San Joaquin Valley through this evening. Another system will bring precipitation throughout Central California by early next week.
DISCUSSION. A persistent band of moderate precipitation continues mainly in Fresno County and northward towards Merced and Mariposa Counties. Otherwise, light showers are occurring elsewhere. Gusty south to southeast winds are also impacting portions of the Central Valley, Tehachapi Mountains, and the West Side Hills. The band of precipitation has moved northward a bit since this morning, based on latest radar data. Expect the windy conditions to continue until tonight. Also, minor street flooding has been reported in some areas today, including where the heavier rain has fallen. Snow levels will likely rise to 5,000 feet by tonight and have been gradually rising through the day today.
Precipitation is expected to last until at least Friday morning, while the heavier precipitation gradually moves southward during Thursday. Precipitation will be mainly showery on Thursday and Friday, at least in the San Joaquin Valley and lower elevations. Snow levels will likely remain steady at around 5,000 feet or just above on Thursday into Friday, including in the Sierra Nevada to the Kern County mountains. Forecast rain and snow amounts for these days are impressive and could cause additional impacts. As we progress with this system, impacts include, but are not limited to, ponding of water on roadways, fallen trees, rocks rolling onto roads, and heavy snow covering roadways in the higher elevations.
Below average temperatures will prevail until Friday as a result of the precipitation, before warming slightly over the weekend into Monday. A weak system is possible towards Merced County and Yosemite on Saturday, so there is a slight chance of precipitation on that day. Otherwise, dry conditions will return for the weekend.
Confidence regarding next week's weather is medium. However, precipitation amounts will likely be lower than with the current system. The storm will arrive late Sunday evening towards the northern portion of our forecast area, or mainly Merced and Mariposa Counties. By Monday afternoon, the system will move southward, including into Kern County. Once precipitation arrives, temperatures will likely fall back to slightly below seasonal averages. Showers will continue until at least Tuesday morning before tapering off by the afternoon or evening. Additional precipitation will likely occur in the form of rain below 6,000 feet initially on Sunday night into Monday, but the snow level will lower to around 5,000 feet by Tuesday morning. Snow levels will continue to fall through the day on Tuesday, although the bulk of the precipitation will have already occurred. It appears dry weather will return by the middle of next week, though with continued cool temperatures.
AVIATION. In the San Joaquin Valley and West Side Hills, strong southerly winds will be possible until 03Z Thursday with gusts reaching 35-50 KT in Merced County and along the West Side Hills. Areas of MVFR in low clouds and rain with local IFR in heavy rain over at least the next 24 hours. In the Sierra Nevada, adjacent foothills and the Tehachapi Mountains, gusty winds, areas of MVFR and local mountain obscuring IFR in low clouds becoming widespread mountain obscuring IFR in moderate to heavy precipitation and low clouds for at least the next 24 hours. Strong southerly winds with gusts around 50-60 KT over the Grapevine and Tehachapi Mountains are expected until late tonight. In the Kern County desert areas, areas of MVFR visibility in rain.
AIR QUALITY ISSUES. Please see SFOAQAHNX for an Air Quality Alert.
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 www.weather.gov/hnx/certainty.html for additional information an/or to provide feedback.
HNX WATCHES/WARNINGS/ADVISORIES. Winter Storm Warning until 4 AM PST Friday for CAZ190>197.
Wind Advisory until 7 PM PST this evening for CAZ180>182.
Wind Advisory until 2 AM PST Thursday for CAZ189.
High Wind Warning until 7 PM PST this evening for CAZ179.
Public/Aviation/Fire Wx . BSO/JA PIO/IDSS . MV/JA/JDB
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Mammoth Yosemite Airport, CA||9 mi||69 min||SE 6||1.00 mi||Light Snow||21°F||21°F||100%||1008.8 hPa|
Link to 5 minute data for KMMH
Wind History from MMH (wind in knots)
|1 day ago||W||N||W||NW||NW||W||NW||Calm||N||Calm||Calm||Calm||SE||SE||E||SE||SE||SE||E||E||NW||W|
|2 days ago||NW||NW||Calm||E||SE||E||W||W||W||S||Calm||W||NW||Calm||Calm||Calm||NW||NW||W|
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GEOS Local Image of CentralWestCoast EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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