Marine Weather and Tides
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 5:35AM||Sunset 8:19PM||Friday May 29, 2020 6:17 PM PDT (01:17 UTC)||Moonrise 12:12PM||Moonset 1:30AM||Illumination 54%|
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 292057 AFDREV
Area Forecast Discussion National Weather Service Reno NV 157 PM PDT Fri May 29 2020
Strong high pressure continues to bring very warm to hot temperatures for the remainder of today. Chances for showers and thunderstorms in eastern California and western Nevada develop later this afternoon and increase early Saturday as low pressure moves into northern California. Windy and much cooler conditions are expected for Saturday with average temperatures and chances for showers continuing into next week.
Very little changes were made to the short term forecast this afternoon. For the most part, everything looks to be on track. Hot temperatures and isolated thunderstorms for the rest of this afternoon/evening and then more thunderstorm activity early Saturday with strong winds and cooler temperatures thanks to the presence of a low pressure system moving into northern California.
On the drive into the office this morning, some altocumulus clouds were visible suggesting the mid to upper-levels were beginning to moisten up. As the morning progressed, thunderstorm activity for this afternoon was questioned due to cloud cover continuing to increase possibly reducing overall heating which could inhibit thunderstorm development. But, taking a look at the current visible satellite imagery over the region, there is a back edge to these mid to upper-level cloud decks along the western slopes of the Sierra. Therefore, some breaks in this cloud cover should take place within the next hour or so. Not much on radar yet, but short term models are showing convection to begin in the next few hours along the eastern Sierra and into the Tahoe Basin. A few cells are also possible to form around the Reno-Sparks and Carson City- Minden areas during this time.
Here are the details regarding temperatures, showers and thunderstorms, and winds for the rest of today into Saturday:
* TEMPERATURES: With the ridge axis over the Four Corners region, very warm temperatures for eastern California and western Nevada are currently being felt with highs expected to be in the low to mid 80s for Sierra valleys and mid to upper 90s for western Great Basin valleys. The incoming upper low for Saturday will cause a huge temperature swing as compared to today's with highs 20-25 degrees colder. Highs rebound to near average on Sunday with mid 60s to lower 70s in Sierra valleys and mid 70s to lower 80s for Basin valleys.
* SHOWERS AND THUNDERSTORMS LATER THIS AFTERNOON-EVENING: Later this afternoon into the evening, cumulus buildups in the Sierra south of I-80 and out into far western Nevada are expected to develop into isolated-scattered showers with a few thunderstorms. Since the best forcing with the aforementioned upper low arrives late tonight and Saturday morning, convection later today will still be largely dependent on instability from daytime heating and convergence from zephyr flow off the Sierra. Still, with rather classic inverted-V soundings and at least a few hundred J/KG of CAPE likely (HREF progs, NAM/GFS soundings) near the Sierra, thunderstorms could bring an enhanced threat for outflow gusts up to 40-50 mph in addition to the standard brief light-moderate rain and chance for cloud-to-ground lightning strikes.
* RAIN WITH EMBEDDED THUNDERSTORMS LATE TONIGHT-SATURDAY: Forcing with the negative-tilt upper low and an associated 100+knot jet arrives in earnest by around daybreak Saturday for northern and northeastern CA. This is expected to result in a blossoming of showers and a few embedded thunderstorms in northeast CA Saturday morning with a good chance at wetting rains from about I-80 northward. Meanwhile, western and northwestern NV will be on the periphery of the best forcing so precipitation may be more of a quick shot with considerably lower totals than farther west. However, some mesoscale simulations from the HRRR continue to show the possibility for thunderstorms (low confidence) in far western NV Saturday morning which could amp up local rainfall totals quite a bit. Even farther east into west- central NV, conditions look mainly dry with wind being the main impact on Saturday.
* WINDS TODAY AND SATURDAY: Most areas will continue to see unremarkable breezes today (outside of any thunderstorm outflows); however, the Chalfant Valley in southeast Mono County and areas east of Hwy 95 and south of Hwy 50 in the Basin look to see considerably higher winds per MOS guidance and short-range model guidance . with gusts 30-40 mph possible. For Saturday, we have issued a Wind Advisory for Pershing, Churchill, and Mineral counties along with Lake Wind Advisories for area lakes, including Tahoe. Winds will pick up area-wide with widespread sustained winds 15-25 mph with gusts 30-45 mph. Some guidance even shows the possibility for winds 20-35 mph with gusts to around 50 mph east of Highway 95 out in the Basin and Range. These winds would be quite likely, if they develop, to pick up dust and spread it northward across Hwy 50 and I-80 near/east of Hwy 95 Saturday afternoon and evening.
LONG TERM. Next week .
As we begin the month of June (how crazy is that?), forecaster confidence is increasing in a broad troughiness pattern setting up for most of the west coast through next week. This translates to around average low and high temperatures, breezy afternoon winds, with chances for isolated to scattered rain showers and afternoon/evening thunderstorms. No signals for any significant storms or high pressure ridges forming over the region for next week.
Expect isolated thunderstorms later this afternoon in the Sierra with a 20-30% chance for a storm in the vicinity at KMMH, KTVL, and KTRK. There will also be slight chances for thunderstorms for portions of western Nevada and northeast California later this afternoon, possibly impacting KRNO, KCXP, and KMEV. Showers and thunderstorms are forecast to continue overnight into early Saturday morning for the Tahoe Basin, northeast California, and portions of western Nevada although there will be a lull for a time between later this evening and early Saturday morning ahead of lifting from an incoming upper low. Expect IFR/MVFR conditions at times and possible strong outflow gusts, small hail, brief downpours, and lightning are near any thunderstorms.
Winds become gusty this afternoon across Mineral County and far southern Mono county with gusts up to 35 kts. Southwest winds on Saturday are expected to be moderately strong across most of the Sierra and western NV with gusts in the 25-40 kt range. Moderate turbulence, especially if traveling over the Sierra, is anticipated for much of Saturday afternoon. Winds look to ease by midnight Sunday. JCM/LaGuardia
Red Flag Warning across the eastern Sierra and western NV starts at 8 AM Saturday. No big change in the forecast reasoning with low pressure moving through California tonight and Saturday. Winds should increase rather quickly Saturday morning, perhaps sooner than the official start time of the Red Flag Warning.
Thunderstorms this afternoon and this evening should remain confined to the Sierra Front and west of Yerington to Pyramid Lake, including the Tahoe Basin and Plumas NF. Storms should move quick enough to limit rainfall raising the treat for a few lightning ignitions. Gusty outflows are also possible if any stronger storms develop. Showers and a few thunderstorms should re-fire after 3 am Saturday when the low reaches the Sac Valley. Some decent potential for wetting rains from Tahoe northward to Lassen Saturday morning.
* Red Flag Warning Details .
Southern Mono County . Breezy south to southwest winds (gusts near 30 mph) and low humidity today, may not let up much tonight as low pressure approaches. Thunderstorm chances this far south look to be only 5-10%. Winds will shift toward the southwest and west Saturday with an uptick in humidity, peak gusts could reach 40-45 mph. Some concern the stronger gusts may kick rather early tonight after 2am or so.
The Sierra Front . A few thunderstorms this afternoon and again Saturday morning followed by southwest to west winds with gusts 30- 45 mph the main concern. Humidity may rise above 30% during the day Saturday with much cooler temperatures. Recent warm/dry weather, threat for a few lightning ignitions, and strong winds are enough to have a heightened awareness Saturday.
Pershing, Churchill and Mineral Counties . South winds will kick in Saturday morning with 30-50 mph gusts and humidity below 20%. Winds should decrease by Saturday evening along with rising humidity. Brong
REV Watches/Warnings/Advisories. NV . Red Flag Warning from 8 AM to 8 PM PDT Saturday NVZ423-429.
Wind Advisory from 8 AM to 8 PM PDT Saturday NVZ001-004.
Red Flag Warning from 8 AM to 8 PM PDT Saturday NVZ420.
Red Flag Warning from 8 AM to 8 PM PDT Saturday below 7000 feet in NVZ421.
Lake Wind Advisory from 8 AM to 8 PM PDT Saturday NVZ002.
Lake Wind Advisory from 8 AM to 8 PM PDT Saturday for Washoe Lake in NVZ003.
CA . Red Flag Warning from 8 AM to 8 PM PDT Saturday below 7000 feet in CAZ274.
Lake Wind Advisory from 8 AM to 8 PM PDT Saturday CAZ073.
Lake Wind Advisory from 8 AM to 8 PM PDT Saturday CAZ072.
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||25 min||SE 5||9.00 mi||Thunderstorm in Vicinity Light Rain||73°F||48°F||43%||1014.6 hPa|
Link to 5 minute data for KTVL
Wind History from TVL (wind in knots)
|1 day ago||Calm||Calm||S||S||S||Calm||S||Calm||S||Calm||Calm||Calm||Calm||Calm||N||N||N||NE||S|
|2 days ago||S||SW||Calm||S||Calm||S||S||Calm||Calm||Calm||S||Calm||Calm||NE||NE||NE|
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Wind Forecast for Reno, NV (21,6,7,8)(on/off)  Help
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