A weak ridge of high pressure will build into the West today, bringing seasonable temperatures and mostly sunny skies for the afternoon. Temperatures will start off cool this morning though — there is a frost advisory in effect for the West Side through 8am. The coolest temperatures will be across the Illinois Valley.
This beautiful weather will be short lived and only through Wednesday. Spring showers are moving in for Thursday, Friday and Saturday. An area of low pressure will track to our north by tomorrow, bringing first a warm front inland and then later a cold front into Thursday evening.
Rain will move into the Coast by early morning tomorrow, and by mid to late morning, rain will begin pushing into Josephine County. By midday and early afternoon, most inland locations will be under showers. The rain is expected to pick up a bit into early evening, just in time for the evening commute. About a half an inch of rain will fall along the Coast and in the mountains, and between a tenth and quarter of an inch across the West Side. This storm is looking a little more potent than it had earlier in the week, which is great news since we need the rain.
A weaker disturbance will keep us under the clouds on Saturday and keep around some showers as well. By Sunday, drier air begins to move in and a warming trend will then begin into the middle of next week. High temperatures will again climb well above average — West Side Valleys are expected to again be in the mid 80′s.