Cold in California, April 24 to 28, 2020

Area Forecast Discussion
National Weather Service Sacramento CA
341 AM PDT Fri Apr 24 2020

.Synopsis...
Dry weather with above normal temperatures continues through the
middle of next week, with Valley highs in the mid to upper 80s
through early next week. Near record highs are expected Tuesday,
with many locations in the 90s.

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.Discussion...
Warmer temperatures are expected today with eastern Pacific
ridging building in. Northerly winds will continue but will
be a little less than yesterday as the ridge axis shifts closer
and the surface gradient weakens. Wind gusts up to 15-20 mph are
possible in the Valley in the afternoon. High temperatures today in
the Valley will climb into the mid to upper 80s, which is 10 to
15 degrees above normal.

Guidance continues to show some flattening of the ridge over the
weekend, as weak disturbances track through the Pacific Northwest.
This should result in some minor cooling. Highs Saturday will be a
degree or so less than Friday, then drop a few more degrees on
Sunday, in the low to mid 80s. About the same is expected Monday,
maybe a degree or two higher as the ridge begins to rebuild. EK

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.EXTENDED DISCUSSION (Tuesday THROUGH Friday)...

A prominent upper ridge will be a fixture in the forecast over the
western U.S. While the positive height anomaly is centered across
the Desert Southwest, a northward extension of this ridge promotes
ample warmth over northern California for Tuesday and Wednesday.
Climatologically speaking, the 582-dm mid-level heights sit around
2 to 2.5 standard deviations above average. Forecast 850-mb
temperatures sit around 19-21C which a deep, well-mixed boundary
layer would support widespread highs in the low 90s, locally into
the mid 90s in some locations. Relative to historical records,
some of these forecast highs will close in on a few of these
numbers. Based on the latest guidance suite, the eastern extent of
an upstream trough will slightly reduce heights on Wednesday which
could shave a few degrees off highs relative to the day previous.
Overall high temperatures will run around 10 to 20 degrees above
climatology. Considering overnight impacts, the persistent of
northerly winds could keep numbers on the mild side, perhaps
mid/upper 60s in the more favorable thermal belts (i.e., Sierra
foothills).

From Thursday onward, as the early week ridge exits toward the
Rockies, a gradual cooling trend is likely. Although daily
temperatures will remain above average, highs in the 90s will be
replaced with widespread 80s. Moving into the following weekend,
the approach of a shortwave trough will introduce additional cloud
cover along with further cooling. 24-hour precipitation
probabilities are low, but non-zero, which suggests some light showers
may return to the region, mainly over the mountains. ~BRO

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.AVIATION...

VFR conditions expected through 12Z Saturday with periods of
scattered high clouds. Winds diminish in strength but can expect
10 to 15 knot northwest to northerly winds between 18Z Friday and
03Z Saturday over the southern Sacramento/northern San Joaquin
Valley terminals. ~BRO

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.STO WATCHES/WARNINGS/ADVISORIES...
None.
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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
803 AM PDT FRI APR 24 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0640 AM     NON-TSTM WND GST 1 NE BLUE CANYON        39.28N 120.70W
02/09/2020  M44 MPH          PLACER             CA   ASOS

            ASOS STATION KBLU BLUE CANYON.

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
807 AM PDT FRI APR 24 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1222 PM     NON-TSTM WND GST 1 NNE CERES             37.62N 120.95W
02/09/2020  M45 MPH          STANISLAUS         CA   ASOS

            ASOS STATION KMOD MODESTO AIRPORT.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
841 AM PDT FRI APR 24 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0139 PM     NON-TSTM WND DMG 1 NE SOULSBYVILLE       38.00N 120.25W
02/09/2020                   TUOLUMNE           CA   FIRE DEPT/RESCUE

            TUOLUMNE COUNTY DEPARTMENT CREATED A
            FACEBOOK POST THAT MULTIPLE TREES AND POWER
            LINES CAME ACROSS THE COUNTY DOWN DUE TO
            STRONG WINDS. LOCATION OF THIS LSR IS NOT
            EXACT.

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
849 AM PDT FRI APR 24 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1222 PM     NON-TSTM WND DMG 1 NNW RIPON             37.75N 121.14W
02/09/2020                   SAN JOAQUIN        CA   BROADCAST MEDIA

            THE MEDIA RECEIVED AN IMAGE OF LARGE FENCE
            BLOWN ON TO HIGHWAY 99 NEAR RIPON. TIMING OF
            THIS REPORT IS ESTIMATED BASED ON PEAK WIND
            GUSTS. LOCATION OF THIS REPORT IS NOT
            APPROXIMATE.

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