Marine Weather and Tides
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:42AM||Sunset 7:06PM||Friday September 17, 2021 8:49 AM PDT (15:49 UTC)||Moonrise 5:49PM||Moonset 2:53AM||Illumination 84%|
7 Day Forecast for Marine Location Near Topaz, CAHourly EDIT Help
Area Discussion for - Reno, NV  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KREV 171040 AFDREV
Area Forecast Discussion National Weather Service Reno NV 324 AM PDT Fri Sep 17 2021
Today will bring afternoon and evening breezes along with warm temperatures. A system will bring gusty winds, increased fire danger, and much cooler temperatures this weekend. Rain showers are possible Saturday night into Sunday north of Highway 50 in eastern California and far western Nevada, and north of Interstate 80 in west-central Nevada. Warmer and drier weather returns next week.
The main forecast story remains the impacts from a trough/cold front due to move through Sunday, with pre-frontal winds and lower humidity of concern Saturday-Saturday night for most areas (Mono and Mineral counties may see lingering issues into Sunday). Some rain remains likely for northeast CA and northwest NV (details below). After the frontal passage, attention turns to colder temperatures with sub-freezing chances increasing for rural and suburban lower valleys for Monday and Tuesday mornings. Let's break it down some more .
* WINDS: Winds will be gusty this weekend with air and ground travel difficulties, choppy lake conditions, and areas of blowing dust. Winds will also bring an increased risk of fire danger; see the fire section below for additional details.
We're expecting gusts 30-45 mph on Saturday with winds remaining elevated Saturday night ahead of the cold front for northeast CA and far western and northwestern NV, especially for wind-prone areas and above valley floors. On Sunday, most of the region will be post-frontal with winds between 25-35 mph although higher gusts remain possible for Mono and Mineral counties as that area waits for the frontal passage in the afternoon and evening.
* TEMPERATURES: Anticipate about a 15-20 degree drop in high temperatures by Sunday-Monday (highs 60s and 70s) as compared to today. Sub-freezing temperatures are likely for outlying rural and suburban lower valleys Monday, and especially Tuesday morning as winds die off for better potential radiational cooling. Well below freezing temps in the highs teens and 20s are likely for mountain valleys away from the immediate shores of larger lakes. Be sure to cover sensitive vegetation if your outdoor gardens are still producing.
* RAIN/SNOW POTENTIAL: Best chances for rainfall will be in northeast California, primarily north of Donner Pass, and for northern Washoe County Saturday night into Sunday. The potential drops off considerably as one gets to I-80 and Hwy 50 in western NV with the best forcing and instability remaining well north per the latest projections. Still, there could be a few light showers blowing past the Carson Range into far western NV early Sunday.
* THUNDERSTORMS: There is a 10% chance for thunderstorms developing in extreme northeast California and northwest Nevada Saturday night.
LONG TERM. next week .
Next week's weather looks rather tranquil with high pressure rebuilding near or off the West Coast for the early part of next week. A shortwave trough may brush across the Pacific Northwest and northern Rockies by midweek, then high pressure appears more likely to rebuild over the western US later next week.
Below average temperatures continue into Monday with highs mainly in the upper 60s-lower 70s for most lower elevations and Sierra valleys. Tuesday morning looks to have chilly conditions again with lows below freezing in some of the typically colder low elevation sites in northeast CA/western NV. Then temperatures warm up to near average (lower-mid 80s lower elevations/70s for Sierra valleys) from Tuesday-Friday with minor fluctuations depending on the track of Wednesday's shortwave.
Precipitation chances next week look minimal with generally light winds, except for potentially enhanced zephyr breezes on Wednesday (gusts near 30 mph) with the most likely scenario of a brush-by shortwave trough. Of course, this wind potential would vary if guidance trends favor a track farther north or south which wouldn't be surprising as we transition into the autumn season. MJD
VFR conditions for most areas continues today with wildfire smoke from the Sequoia and Kings Canyon National Parks creating some slantwise visibility restrictions mainly from Mono-Mineral counties northward into west central NV mainly east of US-95. Some reductions in surface visibility may reach KMMH at times later this morning and again late tonight-Saturday morning with brief MVFR conditions possible.
Winds this afternoon will be relatively typical with gusts mainly 20-25 kt. More significant winds are expected Saturday with peak gusts 30-35 kt for the western NV terminals, and potential for stronger gusts and areas of blowing dust reducing visibility for parts of northwest and west central NV. For Sunday the stronger wind gust potential shifts to areas south of US-50. There is also potential for light rain with a period of lowering CIGS/VIS Saturday night-early Sunday morning mainly from I-80 northward. MJD
* Saturday is looking to have more widespread potential for critical wind and RH conditions, compared to Sunday.
The current watches will remain in place with the stronger winds still favored from US-50 northward on Saturday, and south of US-50 on Sunday. More simulations are indicating a faster cold front passage which would lead to Saturday having more widespread potential for critical fire weather conditions, with the peak wind gusts (35-45 mph) and lowest RH. Sunday's winds behind the front will remain notable, but less likely to reach Saturday's peak gust speeds and accompanied by higher RH, except for portions of Mineral and eastern Mono counties. Mid slopes and ridge tops are likely to see periods of gusty winds starting tonight and continuing through Saturday night.
As for wetting rain potential, northeast CA and far northwest NV continue to be the favored areas Saturday night into Sunday morning, with chances dropping off southward to I-80 (although still about a 50% probability near the Sierra crest west of Tahoe), and little or no rain near and south of US-50. This could still fluctuate as the trough and cold front come nearer. Lightning potential has also decreased, with maybe a 10% chance north of Gerlach to the Oregon border Saturday evening and overnight, but very unlikely elsewhere. MJD
REV Watches/Warnings/Advisories. NV . Fire Weather Watch from Saturday afternoon through Saturday evening NVZ420-423-429-458.
Fire Weather Watch from Sunday afternoon through Sunday evening NVZ421-429.
CA . Fire Weather Watch from Saturday afternoon through Saturday evening CAZ270-278.
Fire Weather Watch from Sunday afternoon through Sunday evening CAZ274.
For more information from the National Weather Service visit . http://weather.gov/reno
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|South Lake Tahoe, Lake Tahoe Airport, CA||30 mi||56 min||S 3||9.00 mi||Fair||39°F||33°F||79%||1017.8 hPa|
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