The weekend is ending on a nice note, with partly sunny skies and warm temperatures. Most of us are in the middle 60s as of the 1 PM observations. Clouds will gradually increase through the afternoon hours, with skies becoming cloudy tonight. Showers will begin to move in late tonight, with the best chance of [...]
A good Saturday to you! After lots of morning sunshine, high level clouds moved in quickly after the noon-time hour. We’ll gradually see a decrease in clouds tonight, with lows in the lower 40s. Sunday will be a rather nice day for us, as temperatures warm into the middle and upper 60s. Clouds will be [...]A good Friday to you! After a cold start to the day, temperatures have modified nicely this afternoon. Many of us are in the upper 50s, with sunny skies. We’ll deal with another cold night, as lows approach freezing. With an area of high pressure right over us and clear skies, we can expect widespread [...]Happy Thanksgiving! The weather turned out perfect for the holiday, with lots of sun and cool temperatures. It is quite cold out there tonight and lows will be near freezing for many locations. Tomorrow is going to be a very similar day, with highs only reaching the 50s. As I sit in the weather center [...]Good afternoon and an early Happy Thanksgiving to you! It has been a beautiful Wednesday across West Alabama. The sky will remain clear through tonight, with lows in the 30s. Another surge of cold and dry air will arrive late tomorrow. It is going to be a sunny Thanksgiving Day, but rather cool, with an [...]A cold front is moving our way and this feature will bring more clouds and the chance for a stray shower tonight. Winds will become northwesterly, with another surge of dry air arriving. Most areas will remain dry tonight and tomorrow will also be a very dry day. Highs will reach the 60s, with a [...]
We’re starting off this short work-week on a mostly cloudy note and it’s feeling quite chilly out there. Tonight the sky will remain cloudy, with winds calming. Lows will be in the 40s and there may be some fog around after midnight. We’re calling for highs in the 60s tomorrow; however, it is going to [...]A good Sunday to you! It has been a raw day weather-wise, with cloudy skies, cooler temperatures and occasional mist. With a good deal of clouds, our temperatures couldn’t get out of the 50s. We’ll hang on to the clouds tonight, so our temperatures won’t drop much from where we are now; we can expect [...]
A good Saturday to you! Our weather will change over the remainder of the afternoon, with increasing light rain from the southwest. A surface low developing along the gulf coast will spread light rain in here this evening and tonight. The rain won’t be all that heavy, but we can expect periods of light rain [...]
: skip to main skip to sidebar Cliff Mass Weather Blog This blog provides my latest forecast or comments on current weather Friday , November 13, 2009 Convective snow over the higher lowlands There is snow falling in convective showers tonight . The air aloft is cool and heavy showers can drive the snow level down to the surface due to evaporation and . melting The latest radar shows a strong band over the northern Sound . this is not your classical PS convergence zone , but rather a secondary convergence zone in the lee of Vancouver Island . something we don't talk about much . There is convergence and resulting upward motion between northerly flow moves southward down the Strait of Georgia and westerly inflow through the Strait . Check the wind plot below to see . this Posted by Cliff Mass Weather Blog at 10:12 PM 7 comments : JewelyaZ said . Beautiful plot . no snow here at 210' in East Bellevue . I'm OK with that November 13, 2009 10:57 PM Liembo said . We still have some rimy , frozen hail on the ground in north Kirkland from last night . A few flashes of lightning around 6:30pm last night , . too November 14, 2009 9:01 AM Blake said . A slight dusting of icy snow' here on: skip to main skip to sidebar Cliff Mass Weather Blog This blog provides my latest forecast or comments on current weather Friday , November 13, 2009 Major Pineapple Express 5:30 PM update on Friday . its snowing in Everett . intense convergence zone convection plus cold temps aloft have brought thundersnow to the ground . The numerical forecast models are consistently calling for a major pineapple expresss atmospheric river event starting Sunday and extending through early Wednesday . These are amazing phenomena . I have an active project now studying them with a graduate student Michael Warner . Huge flux of moisture in what appears from satellite imagery vertically integrated water vapor , above as a narrow plume of . moisture Check out the 24-h precipitation from the 12-km WRF run at the UW for the periods ending 4 PM on Monday and Tuesday graphics Vancouver Island and the Cascade Coast Mountains on the mainland get hammered with a number of areas getting 5-10 inches and more . The Olympics and the northern Cascades also get large amounts . but less . The central Cascades receive far less good for the Green River A major issue is that the freezing levels will move way up ,: skip to main skip to sidebar Cliff Mass Weather Blog This blog provides my latest forecast or comments on current weather Saturday , November 7, 2009 Crazy Weather Heavy showers one minute and sun the next . Followed by more showers . The reaction one often hears is that NW weather is crazy and unpredictable Such things don't happen over the east coast But it turns out that showers and sunbreaks are an essential aspect of NW weather and if you are aware of what is going on and can see a radar image on the web you can take advantage of . it Convective showers and sunbreaks typically follow the passage of cold or occluded fronts across our region . On satellite pictures , one sees a mottled looking fields of clouds , with the dark regions being the clear zones between the showers . These are instability clouds--cumulus , cumulus congestus and cumulonimbus--- the occur when the atmosphere is unstable . see my book for pictures of these The atmosphere becomes unstable when the temperature declines rapidly with height . The analog is your hot cereal being prepared in a saucepan over the stove . You put the burner on the bottom gets hot . a large temperature change occurs in your: skip to main skip to sidebar Cliff Mass Weather Blog This blog provides my latest forecast or comments on current weather Monday , November 2, 2009 Somewhat of a forecast bust Today , both I and the NWS was expecting a dry day over Puget Sound , with perhaps a sprinkle overnight when no one would notice . then improving conditions tomorrow . nbsp The basis of these forecasts were the output from computer forecast models--such as the ones shown below three hour rainfall ending 1 pm and 4pm , probabilistic forecasts from the UW ensemble system--red indicates 90 probability of rain The approaching front was somewhat stronger than forecast and moved in more quickly , so that there were some light showers during the midafternoon see radar images at 1 and 2:42 PM Not the forecast bust of the century , but it shows how things can go wrong , even for a short-term . forecast Posted by Cliff Mass Weather Blog at 8:23 PM 11 comments : smokejumper said . Well usually if the weather deviates the day of the event , they issue short term forecasts but todays case in Seattle , it was too late , the showers came and went . Why Well , maybe if the entire SW quadrant of the radar wasn't missing ,