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Rain into the overnight hours with improvement Thanksgiving Day

Posted at 4:29 PM, Nov 21, 2018

Update: 8:34pm: Rain across SLO county came down hard enough that an Urban and Small Stream Flood Advisory was posted thru 10:15pm due to heavy rain rates which locally may have exceeded .50″ per hour causing minor flooding on roadways.

At 801 PM PST, Doppler radar continued to indicate moderate to heavy rain
 across the advisory area. Automated rain gauges have shown hourly rainfall
 rates between one quarter and one half inch across many portions of the advisory
 area, with a few sites reporting rates between one half and eight tenths of 
 an inch per hour.  This has caused urban and small stream 
 flooding in the advisory area. California Highway Patrol has reported
 street flooding across portions of the county, including San Luis Obispo,
 Morro Bay, and Templeton.
Rainfall reports as of 8:05pm

SBA NORTH CST & VLYS
 CELITE............................ 0.42
 SUDDEN PEAK....................... 0.31
 RANCHO SAN JULIAN................. 0.23
 LOS ALAMOS........................ 0.06
 LOMPOC............................ 0.05
 BUELLTON.......................... 0.04
 SOLVANG........................... 0.03
 SANTA MARIA (KSMX)................ 0.02
 SISQUOC........................... 0.02
 VANDENBERG (KVBG).................    T
 
 .SBA SOUTH COAST
 REFUGIO HILLS RAWS................ 0.29
 DOULTON TUNNEL.................... 0.05
 MARIA YGNACIO RIDGE............... 0.01
 GAVIOTA COAST..................... 0.01
 SANTA BARBARA..................... 0.01
 SANTA BARBARA(KSBA)...............    T
 
 .SBA MTNS & FTHLS
 REFUGIO PASS...................... 0.20
 SAN MARCOS PASS................... 0.03
 EL DESEO.......................... 0.02
 
 .SLO COUNTY COAST
 SLO RSVR.......................... 0.79
 HIGHWAY 46........................ 0.75
 SAN LUIS OBISPO SCG............... 0.71
 ARROYO GRANDE..................... 0.57
 SAN SIMEON........................ 0.55
 CAMBRIA........................... 0.47
 CANET............................. 0.41
 SAN LUIS OBISPO(KSBP)............. 0.34
 SLO - CAL POLY.................... 0.32
 PISMO BEACH....................... 0.12
 OCEANO............................ 0.08
 MORRO BAY......................... 0.05
 
 .SLO COUNTY CENTRAL
 ROCKY BUTTE....................... 1.89
 ATASCADERO........................ 1.11
 SOUTH PORTAL...................... 0.94
 UPPER TORO CREEK ROAD............. 0.91
 LAS TABLAS........................ 0.55
 SANTA MARGARITA BOOSTER........... 0.48
 TEMPLETON......................... 0.44
 SALINAS DAM....................... 0.44
 SANTA MARGARITA................... 0.20
 LAKE LOPEZ........................ 0.11
 PASO ROBLES (KPRB)................ 0.02

The cold front expected to bring rain to much of California is here. Rain began along the north coast in the early afternoon and that line will move south thru SLO and SB counties into the early overnight hours. Along with the rain some healthy S-SE winds of 15-25mph have developed and gusts of 30 are possible. There are no local advisories with this storm but caution during travel is advised.

There will also be enough instability with the upper trough and front to warrant a slight chance of thunderstorms this evening over SLO/SB counties and over parts of Southern California later tonight, including the Woolsey and Hill burn areas.

Rainfall totals through Thursday morning can be expected to be about 0.25 to 0.75 inches across SLO and SBA Counties, with local totals of 1 to 1.50 inches in the foothills and mountains. Isolated totals up to 2 inches are possible across the higher terrain of northwestern SLO County. Across Ventura and Los Angeles Counties, rainfall totals of generally between 0.30 and 0.70 inches are forecast. Local totals of 0.70 inches to 1.25 inches are possible in the foothills and mountains of Ventura and Los Angeles counties, especially in western Ventura County and in the Santa Monica Mountains.

Local Microclimate Rain Forecast
SoCal Microclimate Rain Forecast
NorCal Microclimate Rain Forecast

Rain will turn to scattered showers in by Thursday morning, with showers mostly ending elsewhere. Skies should become partly cloudy in all areas for Thanksgiving with highs nearly everywhere on the Central Coast in the 60s.

Daytime highs will continue to be mild and range from the low to upper 60s through the end of the week and warm next week into the lower 70s.

Another storm drops into Northern California Friday for significant rain in some of the recent burn areas. Flash Flood Watches are in place and debris flow potential is high. Also a lot of snow is expected above 7000ft. in The Sierra.

That Friday system could produce a few local showers as the tail end of the cold front looks to brush the area but totals would be light if any at all. The rest of the weekend looks quiet, and partly cloudy.

Later next week the state could see another round of active weather which could continue into early December.