Marine Weather and Tide Forecast for Portola, CA
May 21, 2024 7:21 AM PDT (14:21 UTC) Change Location
 | Sunrise 5:40 AM Sunset 8:14 PM Moonrise 5:49 PM Moonset 3:24 AM |
FXUS65 KREV 210924 AFDREV
Area Forecast Discussion National Weather Service Reno NV 224 AM PDT Tue May 21 2024
SYNOPSIS
Several upper level waves will bring periods of afternoon breezes and seasonal temperatures this week. There may even be a storm or two in the Sierra Friday. Look for a general warming trend region wide late in the Memorial Day weekend.
DISCUSSION
Key Points:
* Temperatures will bounce up and down around seasonal normals with Wednesday being the warmest day of the week. Then a general warming trend starts early next week.
* Plan on typical afternoon breezes through the week. Coinciding with passage of attendant short wave troughs, Wednesday and Saturday will see enhanced afternoon breezes spreading across western NV.
* There is still a 10-15% chance for some Sierra showers and isolated thunder Thursday/Friday afternoon into the holiday weekend, possibly a bit higher Friday afternoon.
Details:
Little change from previous forecast discussion. The wave of cooler below seasonal average overnight lows are projected to rebound into more seasonal values through the remainder of this week. A short wave ridge racing across the region later Tuesday will help boost Wednesday daytime highs that will be perched mostly in the 70s across western NV with some lower valley areas reaching into the low 80s. Sierra locations with benefit from this temporary hiatus in temperatures with Wednesday daytime highs topping out in the upper 50s and 60s. Clear skies, dry conditions, and a cooler air mass reinforced with passage of each successive upper short-wave trough will keep temperatures near seasonal averages this week.
Therefore, don’t look for any worthwhile warming until later in the holiday weekend into next week.
Several troughs either brush-by or drop back-door like through the region this week. The first upper wave will pass over the region Wednesday that is projected to enhance our typical afternoon breezes.
As far as the week is concerned, the highest wind gusts will peak this day with wind gusts to 35-40 mph mixing down into lower valley areas of western NV. Some of the more wind prone areas look to see gusts reaching 50 mph in the afternoon. The direct result will be bumpy aviation conditions across higher terrain of the Sierra eastward into western NV, and choppy surfaces on area lakes. As we move towards late spring/summer, fire concerns need to be kept in mind. Regional fuels and vegetation are not in a state to cause any significant fire spread, but we want to avoid any activities that could bring about an early season fire especially during these periods of stronger breezes.
There is even a slight chance (15-20%) of a few showers passing across far northeast CA, and far northern Washoe County close to the OR border later this afternoon into the evening. Subsequent upper waves will bring a potential for some showers and an isolated storm or two Thursday afternoon along the Sierra crest with an even better potential (15-25% chance) later Friday afternoon.
Memorial Day Weekend: Looking at a general warming trend with afternoon breezes continuing over the holiday weekend. There will also be a lingering shower and thunderstorm potential across higher terrain of the Sierra as well (less than 15%). Some ensemble simulations are stubbornly holding fast to that notion going into this weekend. For the most part, the weekend is looking dry but if you plan on recreating in the Sierra back-country during the Memorial Day weekend, it’s advised to have an escape plan handy to minimize any harm from an increased lightning threat.
-Amanda
AVIATION
* VFR conditions will continue for main terminals with easterly winds 10 kt or less for area main terminals today. Increased northeast flow above FL100 may continue to produce periods of light to moderate turbulence west of the Sierra crest till 15-18Z this morning.
* Several upper-level troughs passing over the region this week will bring afternoon breezes that will be enhanced Wednesday with gust to 25-30kts, near normal temperatures, and some late- day showers and thunderstorms mainly over the Sierra Friday afternoon. VFR conditions will still prevail outside of any showers/thunderstorms. Look for an increased chance for periods of light to moderate mountain wave turbulence especially across the Sierra and eastward when FL100 winds top 30-35kts, especially Wed/Sat.
* A warming trend will take place Memorial Day weekend with very low chances for showers and thunderstorms (less than 15%).
-Amanda
REV Watches/Warnings/Advisories
NV...None.
CA...None.
Area Forecast Discussion National Weather Service Reno NV 224 AM PDT Tue May 21 2024
SYNOPSIS
Several upper level waves will bring periods of afternoon breezes and seasonal temperatures this week. There may even be a storm or two in the Sierra Friday. Look for a general warming trend region wide late in the Memorial Day weekend.
DISCUSSION
Key Points:
* Temperatures will bounce up and down around seasonal normals with Wednesday being the warmest day of the week. Then a general warming trend starts early next week.
* Plan on typical afternoon breezes through the week. Coinciding with passage of attendant short wave troughs, Wednesday and Saturday will see enhanced afternoon breezes spreading across western NV.
* There is still a 10-15% chance for some Sierra showers and isolated thunder Thursday/Friday afternoon into the holiday weekend, possibly a bit higher Friday afternoon.
Details:
Little change from previous forecast discussion. The wave of cooler below seasonal average overnight lows are projected to rebound into more seasonal values through the remainder of this week. A short wave ridge racing across the region later Tuesday will help boost Wednesday daytime highs that will be perched mostly in the 70s across western NV with some lower valley areas reaching into the low 80s. Sierra locations with benefit from this temporary hiatus in temperatures with Wednesday daytime highs topping out in the upper 50s and 60s. Clear skies, dry conditions, and a cooler air mass reinforced with passage of each successive upper short-wave trough will keep temperatures near seasonal averages this week.
Therefore, don’t look for any worthwhile warming until later in the holiday weekend into next week.
Several troughs either brush-by or drop back-door like through the region this week. The first upper wave will pass over the region Wednesday that is projected to enhance our typical afternoon breezes.
As far as the week is concerned, the highest wind gusts will peak this day with wind gusts to 35-40 mph mixing down into lower valley areas of western NV. Some of the more wind prone areas look to see gusts reaching 50 mph in the afternoon. The direct result will be bumpy aviation conditions across higher terrain of the Sierra eastward into western NV, and choppy surfaces on area lakes. As we move towards late spring/summer, fire concerns need to be kept in mind. Regional fuels and vegetation are not in a state to cause any significant fire spread, but we want to avoid any activities that could bring about an early season fire especially during these periods of stronger breezes.
There is even a slight chance (15-20%) of a few showers passing across far northeast CA, and far northern Washoe County close to the OR border later this afternoon into the evening. Subsequent upper waves will bring a potential for some showers and an isolated storm or two Thursday afternoon along the Sierra crest with an even better potential (15-25% chance) later Friday afternoon.
Memorial Day Weekend: Looking at a general warming trend with afternoon breezes continuing over the holiday weekend. There will also be a lingering shower and thunderstorm potential across higher terrain of the Sierra as well (less than 15%). Some ensemble simulations are stubbornly holding fast to that notion going into this weekend. For the most part, the weekend is looking dry but if you plan on recreating in the Sierra back-country during the Memorial Day weekend, it’s advised to have an escape plan handy to minimize any harm from an increased lightning threat.
-Amanda
AVIATION
* VFR conditions will continue for main terminals with easterly winds 10 kt or less for area main terminals today. Increased northeast flow above FL100 may continue to produce periods of light to moderate turbulence west of the Sierra crest till 15-18Z this morning.
* Several upper-level troughs passing over the region this week will bring afternoon breezes that will be enhanced Wednesday with gust to 25-30kts, near normal temperatures, and some late- day showers and thunderstorms mainly over the Sierra Friday afternoon. VFR conditions will still prevail outside of any showers/thunderstorms. Look for an increased chance for periods of light to moderate mountain wave turbulence especially across the Sierra and eastward when FL100 winds top 30-35kts, especially Wed/Sat.
* A warming trend will take place Memorial Day weekend with very low chances for showers and thunderstorms (less than 15%).
-Amanda
REV Watches/Warnings/Advisories
NV...None.
CA...None.
Reno, NV,
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