Looking at the models here, things are going pretty good as far as the weekend goes as we should have mostly sunny skies during this time frame with off shore flow as a large cut-off low drops south along west coast. It also appears that this mornings GFS runs has this low even farther off the off-shore waters of the west coast. So other than perhaps some passing highs clouds at times from that cut-off low, skies should be generally sunny and mild. Not only that, but Easterly to ESELY flow is showing up at the 850/925mb level, which in turn should 'heat' us up due to down sloping winds off the Cascades. Low level temps just above the surface look to rise nicely as by later Sun into Mon, 925mb temps are near +16c with 850mb temps near +8c on the 12zWRF though temps just a tad cooler on the operational 6z/12zGFS, but still a nice rise none the less. Now however what the 12zWRF shows(108hr) that the NCEP GFS model don`t, is what appears to be a weak 1008mb thermal-low that gets ejected out of the southward moving low. This thermal low looks to move up into NW Oregon by Monday afternoon with 925mb temps of +16c with East to SELY flow. Should be quite warm for the models are worth.
Now as far as temps goes, highs on Sat look to be near 60 or in the low 60`s with mid 60`s to possible few upper 60`s on Sun. Now here`s where it gets nice`n and warm, though the model could certainly be over doing it. You ready? Mon highs on the 12zWRF show possible lower 70`s with lows on Sun/Mon being in the low 50`s. So some nice and very spring-like weather still looks pretty good at this point. And for the extended period, the Mon-wed still looks mainly dry, mild and probably a bit above normal. GEM/Canadian/EURO also show weak ridging of sorts for first half of the work week. But again, models can over do things, so we`ll just how warm it gets over the weekend. On the other hand, think Seattle NWS is forecasting lower 60`s, while 12zMRF-MOS is too cool in my opinion as it shows 50 on Sat/ 59 Sun/ 62 Mon. So I think the MOS may be playing it on the cool side and not really factoring in what is being shown in the models as the low levels do dry up and warm up some on Sat with further drying/warming on Sun. But over all, it`ll be a nice break from this cool and rainly weather we`ve been having lately.
Thursday, April 2, 2009
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