Wenatchee/Okanogan Forecast

Date Issued: 2021-05-14 17:41:48 (viewed 23 times)

Discussion:

A weak trough made its way through the ridge over the region, becoming a closed low in California. The ridge will begin rebuilding overnight tonight to keep temperatures well above protection thresholds. Temperatures aloft combined with dew points in the upper 20s to mid 30s place potential minimums around the low 40s, but most locations are likely to have lows in the upper 40s or warmer. A modest pressure gradient from northwest to southeast will keep drainage flow active on valleys leading out of the Cascades and British Columbia.

A warming trend is expected for the weekend with the warmest temperatures coming Sunday and Sunday night. During the day Saturday and Sunday look for highs well into the 80s with lows also following the warming trend. Potential minimums Saturday and Sunday nights are around the low 40s, but many stations will probably not get below 50.

A marine push from the Pacific Ocean is forecast to moderate high temperatures somewhat Monday, though highs in the upper 70s and 80s are still expected for most. The push will raise dew points to the mid 30s to near 40 degrees. Tuesday a cold front reaches the coast and moves eastward, resulting in increased cloudiness and breezy winds that will inhibit development of nocturnal temperature

inversions. Some rain showers are possible Tuesday night, but these will probably be limited to upslope areas. Both Monday and Tuesday nights are currently expected to remain above protection thresholds.

Okanogan:

-The 5 pm PDT temperature at Omak Airport was 81 degrees with a dew point of 36 degrees.

Tonight

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Min Temp: Mid 40s to low 50s.
Protection: Should not be needed.
Ceiling or Inversion: Moderate. No cigs.

Saturday and Saturday Night

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Max Temp: Low to mid 80s.
Min Temp: Upper 40s to mid 50s.
Protection: Should not be needed.

Further Outlook
Sunday and Sunday Night

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Max Temp: Mid 80s to near 90.
Min Temp: Upper 40s to mid 50s.
Protection: Should not be needed.

Monday and Monday Night

Weather: Partly cloudy, dry conditions expected.
Wind: W/NW with breezy areas.
Max Temp: Low to mid 80s.
Min Temp: Mid 40s to near 50.
Protection: Should not be needed.

Tuesday and Tuesday Night

Weather: Increasing clouds overnight, low chance of upslope showers.
Wind: W/NW and breezy.
Max Temp: Low to mid 70s.
Min Temp: Mid 40s to near 50.
Protection: Should not be needed.

Key Station Forecasts (2021-05-15 00:00:00)
E.OrovilleAFOkanogan (CW)AF
EllisfordeAFMalott (CW)AF
Ellisforde (CW)AFBrewster.N (CW Brewster Flat)AF
Loomis ValleyAFBrewester.SAF
Tonasket.SAFBridgeport (CW)AF
Pogue FlatAFMethow (CW)AF
All Stations are AgWeatherNet Stations
(CW) = Indicates an Absorbed Clearwest Station
(CW XXX) = Indicates an Absorbed Clearwest Station and Original Name of Clearwest Station
SAF = slightly above 32 (33 or 34); AF = above 32 (35 or higher)

Wenatchee:

-The 5 pm PDT temperature at Wenatchee-Pangborn Airport was 82 degrees with a dew point of 34 degrees.

Tonight

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Min Temp: Upper 40s to mid 50s.
Protection: Should not be needed.
Ceiling or Inversion: Moderate. No cigs.

Saturday and Saturday Night

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Max Temp: Low to mid 80s.
Min Temp: Upper 40s to mid 50s.
Protection: Should not be needed.

Further Outlook
Sunday and Sunday Night

Weather: Mostly clear, dry conditions expected.
Wind: Generally light, dependent on topography.
Max Temp: Mid 80s to near 90.
Min Temp: Low to upper 50s
Protection: Should not be needed.

Monday and Monday Night

Weather: Partly cloudy, dry conditions expected.
Wind: W/NW with breezy areas.
Max Temp: Low to mid 80s.
Min Temp: Mid 40s to low 50.
Protection: Should not be needed.

Tuesday and Tuesday Night

Weather: Increasing clouds overnight, low chance of upslope showers.
Wind: W/NW and breezy.
Max Temp: Low to mid 70s.
Min Temp: Mid 40s to near 50.
Protection: Should not be needed.

Key Station Forecasts (2021-05-15 00:00:00)
Wenatchee.W (TFREC)AFE.Wenatchee (CW)AF
Peshastin.N (CW Leavenworth)AFOrondo (CW)AF
Cashmere (CW)AFBrays LandingAF
Stemilt (CW)AFBoyd DistrictAF
Malaga (CW)AFManson (CW)AF
All Stations are AgWeatherNet Stations
(CW) = Indicates an Absorbed Clearwest Station
(CW XXX) = Indicates an Absorbed Clearwest Station and Original Name of Clearwest Station
SAF = slightly above 32 (33 or 34); AF = above 32 (35 or higher)
Extended Outlook

Tuesday’s cold front is forecast to usher in a more active weather pattern with upper level troughing becoming the dominant factor in Pacific Northwest weather. Repeated chances of rain showers are in place for the entire extended period, but it’s hard to pin down specific details at this point because of disagreements between weather models regarding the timing of specific synoptic and mesoscale features within the larger upper level trough. During this period, much of the rain will be focused on upslope areas but some showers are possible in the lowlands. While precipitation values are likely to be low, persistent mostly cloudy to overcast skies is forecast to limit radiational cooling through the overnight hours. A tight west-to-east pressure gradient is possible through the extended period, which should keep drainage flow active out of mountain areas. This is expected to be enhanced by shortwave disturbances within the low to keep many spots breezy and limit development of nocturnal inversions.

Ingalls

Washington State University