January 31, 2018 – Dry and mild for the next week with above average daytime temperatures. Areas of night and morning valley fog.
Flat high pressure aloft over the west coast bringing dry conditions with mainly fair skies. Some patchy fog has formed in the central valley this morning from about Marysville southward. Surface winds in this area are calm this morning with variable high clouds spilling over the ridge so not expecting the fog to become widespread. Overall airmass changes little today from Tuesday so expecting daytime highs today to come in similar to Tuesday remaining several degrees above normal. Upper ridge continues to amplify over the west coast on Thursday bringing still warmer temperatures. Patchy fog will be likely again in the morning hours. With amplification of the ridge, believe any precipitation will be shunted north of the CWA so have elected to remove any precipitation from the northern mountains Thursday. Upper ridge continues to build Friday and Saturday for still warmer temperatures. By Saturday afternoon, daytime highs will be pushing close to record territory.
Extended discussion (Sunday through Wednesday)
Warm and dry weather will continue through at least the middle of next week due to a persistent high pressure ridge over the eastern Pacific. High temperatures at or above 70 degrees are expected across much of the Valley and foothill locations. Hot spot will likely be the northern Sacramento Valley, where northerly winds will bring about some dry adiabatic warming. Morning fog will be possible in the Valley, though might be limited due to drier conditions and northerly winds.