Yakima Valley/Central Basin Forecast

Date Issued: 2021-05-14 17:41:56 (viewed 25 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 across the Cascades will keep drainage flow active on valleys leading out of the mountains.

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 (and even a few 90s) 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 80s are still expected for most. This will raise dew points to around 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. Both Monday and Tuesday nights are currently expected to remain above protection thresholds.

Yakima Valley:

-The 5 pm PDT 3500 foot wind at Rattlesnake Mountain was NNW at 2 mph, gusting to 8 mph.
-The 5 pm PDT temperature at Yakima Airport was 82 degrees with a dew point of 27 degrees.

Tonight

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

Further Outlook
Sunday and Sunday Night

Weather: Clear, dry conditions expected.
Wind: Generally light and dependent on topography.
Max Temp: Upper 80s to mid 90s.
Min Temp: Low to upper 50s.
Protection: Should not be needed.

Monday and Monday Night

Weather: Mostly clear, dry conditions expected.
Wind: W with breezy areas.
Max Temp: Mid to upper 80s
Min Temp: Mid 40s to near 50
Protection: Should not be needed.

Tuesday and Tuesday Night

Weather: Increasing clouds overnight. Slight chance of rain mainly W of Yakima.
Wind: W and breezy.
Max Temp: Upper 70s to mid 80s.
Min Temp: Mid 40s to near 50
Protection: Should not be needed.

Key Station Forecasts (2021-05-15 00:00:00)
Yakima AirportAFWapato.SEAF
Gromore (CW)AFW.Wapato (CW)AF
Summitview Ext. (CW)AFLombard Loop (CW)AF
CowicheAFBuenaAF
Tieton.NAFCherry HillAF
E.Tieton (CW)AFSunnyside AirportAF
Naches Hghts (CW)AFGrandviewAF
NachesAFProsser.NAF
Gleed.NE (CW Gleed)AFWhitstran (CW)AF
Selah-Speyers (CW)AFBenton CityAF
PonomaAFSouth KennewickAF
Moxee.N (CW Moxee)AFE.Kennewick (CW)AF
N.Wapato (CW)AF100 CirclesAF
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)

Central Basin:

-The 5 pm PDT temperature at Grant County International Airport in Moses Lake was 84 degrees with a dew point of 30 degrees.

Tonight

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

Further Outlook
Sunday and Sunday Night

Weather: Clear, dry conditions expected.
Wind: Generally light and dependent on topography.
Max Temp: Upper 80s to mid 90s.
Min Temp: Low to upper 50s.
Protection: Should not be needed.

Monday and Monday Night

Weather: Mostly clear, dry conditions expected.
Wind: W with breezy areas.
Max Temp: Mid to upper 80s.
Min Temp: Mid 40s to near 50.
Protection: Should not be needed.

Tuesday and Tuesday Night

Weather: Increasing clouds overnight, dry conditions expected.
Wind: W and breezy.
Max Temp: Upper 70s to mid 80s.
Min Temp: Mid 40s to near 50.
Protection: Should not be needed.

Key Station Forecasts (2021-05-15 00:00:00)
Moses Lake AirportAFQuincyAF
Radar HillAFMattawa.EAF
RingoldAFFrenchmanAF
Pasco AirportAFRoyal City.EAF
FishhookAFGeorge (USBR)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