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Posted inRegional

Warm and dry weather continues with temperatures 5 to 10 degrees above average

Warm and dry weather with temperatures returning to average by mid-week. Discussion Clear skies cover the region early this morning. Stratus is extensive along the coast and the marine layer is around 1.5k ft deep. Surface pressure gradients are a little more onshore, and the increased Delta Breeze has brought minimal cooling inland to the […]

Posted inRegional

Flooding impacts possible from thunderstorms and rain later today and Wednesday

Showers and thunderstorms over interior NorCal through Wednesday. High temperatures well below normal through mid-week, returning to near normal by next weekend. Ash & debris flow concerns on recent burn areas and urban flooding concerns today due to heavy downpours. Discussion Quasi-stationary mid/upper low continues to spin off the coast west of the Bay Area. […]

Posted inRegional

Flooding impacts possible from thunderstorms and rain today through Wednesday

Showers and thunderstorms over interior NorCal through Wednesday. High temperatures well below normal through mid-week, returning to near normal by next weekend. Ash & debris flow concerns on recent burn areas and urban flooding concerns today due to heavy downpours. Discussion Low remains nearly stationary just offshore to the southwest of Cape Mendocino. Frontal zone […]

Posted inRegional

Widespread rain, chances for thunderstorms Monday through Wednesday

Showers and thunderstorms possible over interior Northern California through Wednesday. High temperatures well below normal through midweek, returning to near normal by next weekend. Discussion Large 550 DM upper low centered about 150 NM west of KUKI this morning with embedded vorticity maxima rotating around it into NorCal. Radar showing light to moderate showers over […]

Posted inRegional

Widespread rain Sunday into early next week – with a side of smoke

Cooling trend through this weekend with below normal temperatures continuing next week. Widespread shower chances late Saturday into early next week with possible afternoon thunderstorms. Smoke from the Mosquito Fire could bring locally low visibility Sunday morning. Discussion Long wave trough along the West Coast as 553 DM low over B.C. digs into it over […]

Posted inRegional

Widespread rain this weekend into early next week

Cooling trend through this weekend. Smoke from area wildfires will persist over portions of interior NorCal, mainly foothill and mountain locations. Widespread shower chances return late Saturday into early next week. Discussion Flat zonal upper level pattern will prevail for one last day, before heights begin to lower with troughing over the weekend as upper […]

Posted inRegional

Widespread rain possible this weekend and early next week

Cooling trend this week. Smoke from area wildfires will persist over portions of interior NorCal, mainly foothill and mountain locations. Widespread shower chances return late Saturday into early next week. Discussion Flat zonal upper level pattern will prevail over Norcal today into Friday, as upper level low takes shape over British Columbia. Ensembles and clusters […]

Posted inRegional

Cooling trend continues, chance of precip on Sunday

Cooling trend this week. Smoke from area wildfires will persist over portions of interior NorCal. Shower chances return this weekend. Discussion Clear to partly cloudy skies cover the region early this morning. Onshore flow continues, though the surface gradient from the coast to the valley has slackened since Tuesday afternoon. The cooling trend continues with […]

Posted inRegional

Cooling trend this week, with a side of smoke

Cooling trend this week. Smoke from area wildfires will continue to impact portions of interior NorCal. Late-day thunderstorms are possible over the northern Sierra Nevada through the middle of the week. Discussion Mostly cloudy skies cover interior NorCal as moisture from Kay remains over the region. A few sprinkles, or light showers, persist to the […]

Posted inRegional

Last day of dangerous heat and elevated fire weather conditions

Dangerous heat will persist through today. Smoke from area wildfires will continue to impact portions of interior northern California. Thunderstorms are possible over the northern Sierra Nevada this weekend into early next week. Discussion This will be the last day of dangerous heat with near record and record heat for the interior. The mountains and […]

Posted inRegional

Dangerous heat and elevated fire weather conditions through Friday, Mountain thunderstorms possible into next week

Dangerous heat will persist through the end of the week. Monsoon moisture will bring a slight chance of thunderstorms to the northern Sierra Nevada. A more significant moisture surge is possible over the weekend into early next week. Discussion Dangerous heat will continue today with record heat continuing. Although we have been trending cooler this […]

Posted inRegional

Dangerous Heat and Elevated Fire Weather Conditions through the Workweek

An extended period of dangerous heat is expected for most of this week. Well above normal temperatures are expected to continue each day through the middle of next week, with the most significant heat forecast for Sunday through Wednesday. Monsoon moisture could push into the Sierra bringing ~5-15% chance of thunderstorms south of Highway 50 […]

Posted inRegional

Dangerous heat and high fire danger over the holiday weekend into the middle of next week

An extended period of dangerous heat is expected for the Labor Day holiday weekend into next week. Above normal temperatures are expected to continue each day through the middle of next week, with the most significant heat forecast for Sunday through Tuesday. Discussion Warm temperatures are lingering over interior Northern California early this morning under […]

Posted inRegional

Elevated fire weather conditions over the holiday weekend

An extended period of dangerous heat expected for the holiday weekend into next week. Excessive Heat Warning from 11 AM Saturday to 8 PM Tuesday. Record heat along with very low daytime humidity will lead to increased fire weather conditions. Discussion Clear skies cover interior NorCal early this morning. Surface pressure gradients are nearly identical […]

Posted inRegional

Dangerous Heat and Elevated Fire Weather Conditions over the Holiday Weekend and beyond

An extended period of dangerous heat expected for the holiday weekend into next week. Excessive Heat Watch from Saturday morning through Tuesday evening. Discussion We are seeing southwest flow and quiet conditions today. Overall temperatures are within a few degrees of yesterday and we should see similar highs today as yesterday. We will then see […]

Posted inRegional

Dangerous heat and elevated fire weather conditions over the Holiday Weekend

Hot weather gradually builds this week, peaking over the Labor Day weekend. A few thunderstorms will be possible over the Sierra south of Lake Tahoe this afternoon. Discussion Some mid and high clouds associated with the closed low to the southwest of the Bay Area cover portions of the region early this morning, but overall […]

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