Transition to (+PNA) Pacific North American Circulation Pattern underway with Ridge in the West and Trof in the East…..Short Wave System for Thursday will Weaken with clouds and some cooling….
Friday January 2, 2015
Posted at 9:31 pm by Howard
As of Saturday morning the 3rd….
A strong upper ridge is currently building with 500MB heights well into the 580s early next week. Strong Temperature inversions will be the theme. Expect highs this weekend in town climbing well into the 40s then 50s first half of the week. Winds will continue to be light. Early morning lows will range with single digits and teens along thee highway 395 corridor….The Town of Mammoth will be in the teens and 20s early in the weekend then 20s and 30s as we go into next week. The Upper ridge will peak out Tuesday with the Freezing level topping 14,000 ft during the day. Thereafter, a slow weakening of the ridge will take place through Friday where the Freezing level falls to 8K that morning. This is associated with a short wave that will bring cooling, clouds, some wind and a slight chance of showers. Heights rise again over the following weekend along with the freezing level. A temperatures inversion is expected to set up again. Thus the Long Wave ridge position will anchor over the 6 to 10 day and possibly even out to the 8 to 14 day period near 120West. Heights “in the mean” at 500mb will be in the low 570s. This is common during the month of January. Hence the term January thaw……Longer range charts weeks 3 and 4 of the ECMWF shows the possibility of the upper Asian Jet extending back to CA for more snowfall…..
Next update January 13th……