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June 7, 2018 – Interior Northern California will have seasonable temperatures and dry conditions through Friday. A weak weather system moves across the north part of the region over the weekend. Its main effect will be cooler temperatures and the chance for showers north of Redding. The showers may have isolated thunder beginning Saturday afternoon. Dry weather returns Sunday with a warming trend starting Monday with seasonably hot weather returning by midweek.
No significant changes to the forecasts this morning. Still expect the cool, dry weather to continue as a trough of low pressure over the Western Pacific Ocean approaches the region. The main impact from this trough will be cooler than normal temperatures through the weekend and breezy conditions as the trough moves across the area Saturday night and early Sunday.
Extended discussion (Monday through Thursday)
Dry through the extended period under flat upper level ridging. Daytime highs will warm through mid week starting at a few degrees above normal on Monday then climbing to 10 to 15 degrees above normal by mid week. Daytime highs Wednesday and Thursday are forecast to push up to near 100 throughout much of the central valley. Winds should remain fairly light under the ridge. ECMWF moves a Gulf of Alaska low onto the the coast by the end of next week which could bring some cooling and possibly some precipitation to the northern zones but GFS not in agreement with this scenario. Have kept up daytime temperatures for next Thursday and will wait for better model consistency.