Thursday, July29, 2021
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Marine Weather and Tides
Topaz, CA

Version 3.4
NOTICE
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 5:57AMSunset 8:15PM Thursday July 29, 2021 6:01 PM PDT (01:01 UTC) Moonrise 11:40PMMoonset 11:46AM Illumination 69% Phase: Waning Gibbous; Moon at 20 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 Topaz, CA
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location: 38.67, -119.53     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 291958 AFDREV

Area Forecast Discussion National Weather Service Reno NV 1258 PM PDT Thu Jul 29 2021

SYNOPSIS. Daily thunderstorm chances are in the forecast through this weekend with locally heavy rain possible. Smoke and haze from nearby wildfires will also continue. Temperatures will be variable, but generally within 5 degrees of normal, outside of this weekend which will be cooler. Drier conditions with the return to more typical westerly winds arrives around August 3-4.

DISCUSSION.

Main change to the forecast was to add a Flash Flood Watch for Friday for Alpine, Mono, Douglas, Lyon and Mineral Counties.

Increasing moisture will keep the threat for showers and thunderstorms with heavy rain/intense rainfall rates, and strong outflows going into at least Saturday. Some drying could occur Sunday with a more certain decrease in thunderstorm activity Monday. The area should be thunderstorm free by Tuesday with afternoon and evening breezes off the Sierra. Afternoon highs could nudge closer to 100 degrees for the NV valleys Tuesday- Wednesday.

Heavy rain and Flash Flood Potential Friday . Primary area for the Flash Flood Watch is Alpine, Mono, Douglas, Lyon and Mineral Counties. Heavy rain is also possible around the Tahoe Basin, Reno Metro/southern Washoe county, Carson City and Storey County. Simulations have remained consistent with the moisture content tomorrow (precipitable water values above 0.70 inch) with good instability and surface bases heating for shower/thunderstorm development. Storms may kick of as early as 10-11 am Friday.

Debris flows off recent burn scars is our main concern which includes, the Tamarack, Numbers, Slink, Boot, and Mountain View burn scars. Heavy rain could also lead to rapid rises on small creeks, water ponding/flowing over roads, and rock slides in areas of moderate to steep terrain.

Thunderstorms Saturday to Monday . Saturday remains a challenge with varying model solutions on forcing and cloud cover. Some simulations show minimal thunderstorm activity due to extensive cloud cover and afternoon highs down in the 80s. Have maintained the previous forecast with the abundant moisture in place an no sign of it drying out until Monday. Even minimal surface heating should lead to at least showers and a few thunderstorms. If the forcing aloft materializes or there is minimal cloud cover for surface based instability; convection will easily turn strong and maintain the flash flood threat Saturday. Recent simulations show less drying for Sunday, would cloud keep showers and thunderstorms around much of the region. A dry and stable southwest flow arrives Monday though a few thunderstorms may develop over northern Lassen/Washoe and areas east of Highway 95.

Smoke . The Dixie Fire remains the main contributor to reduced air quality into the weekend. Southerly flow the next couple days could keep and new smoke from pushing into Reno-Tahoe and points south. Heavy rain and some gusty outflow winds from thunderstorms could improve air quality for any lingering haze/smoke trapped in valleys. Brong

AVIATION.

An active period of thunderstorm potential is expected through the weekend as monsoon moisture continues to filter northward into the region. Showers and isolated thunderstorms will be possible through this evening (approx. 09z), though most storms are likely to wind down by 04-06z tonight. Increasing storm coverage and chances will increase on Friday and Saturday as additional moisture streams across the Sierra and western Nevada.

Most area terminals will be impacted from these storms, whether it be from heavy rain, lowering cigs/vis, and outflow winds potentially exceeding 40 kts. The strongest winds are likely into the Nevada Basin and Range, with the heaviest rain potential in the Sierra and western Nevada near/south of I-80. Anticipate areas with mountain obscuration due to the storms, especially in the Sierra.

As far as smoke, the Dixie Fire remains the primary contributor. The worst conditions remain around Lake Almanor, Portola, Susanville, and the Honey Lake Basin. Otherwise, general haze and slantwise visibility reductions will remain across the region. Fuentes

REV Watches/Warnings/Advisories. NV . Flash Flood Watch from Friday afternoon through Friday evening NVZ001>003.

CA . Flash Flood Watch from Friday afternoon through Friday evening CAZ072-073.



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
South Lake Tahoe, Lake Tahoe Airport, CA30 mi69 minS 15 G 2310.00 miThunderstorm in Vicinity Light Rain68°F50°F53%1021.9 hPa

Link to 5 minute data for KTVL

Wind History from TVL (wind in knots)
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Last 24hrNE6N4CalmCalmS4CalmS4S4S3CalmS4S3S3S3CalmNE6N7N8--Calm4SE4S15
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1 day agoS7CalmCalmCalmS3CalmS6S3S3CalmS3S3S3SE3Calm54NE9--4E7CalmS5Calm
2 days agoS5S5S5S5S6CalmCalmS4CalmCalmS4S6S7S4S4S6S9S6645SW8
G18
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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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