Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

341
FXUS66 KHNX 251201
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
501 AM PDT Sun Jun 25 2017

.SYNOPSIS...
Temperatures will remain well above normal today, with just a few
afternoon and evening thunderstorms possible over the Southern
Sierra Nevada. Dry conditions and more noticeable cooling will
begin Monday, with temperatures lowering to near normal by
midweek.


&&

.DISCUSSION...
The week disturbance and associated mid level moisture, which
helped fire off thunderstorms over the Sierra and Kern County
mountains Sunday, is moving East away from our area leaving a
drier southwesterly flow in place. As the upper ridge rebounds
slightly behind the departing shortwave trough, some locations
today will see temperatures a degree or so higher than Saturday.
Desert areas will see max temps as high as 109-113, and the
Excessive Heat Warning continues there today. Although there has
been a slight cooldown across the area, there is still some
elevated heat risk today across the San Joaquin Valley, the
foothills and the Kern County mountains. A Heat Advisory remains
in effect there today. Expect less convective activity today in
the drier southwest flow, no more than a few isolated
thunderstorms possible near the Sierra crest.

A more significant cooldown will take place Monday through
Wednesday as a low pressure system moves onshore to our north and
weakens and suppresses the upper ridge extending north across our
region. This will drop temperatures to around climo by the middle
of the week. The lower temperatures may slow the runoff of
melting snow from the Sierra and help to alleviate some of the
flooding concerns downstream. But for now, large water releases
continue from Pine Flat Dam and a Flood Warning remains in effect
for portions of Northern Kings, Northwest Tulare and Central
Fresno Counties. A Flood Advisory remains in effect for areas
along the San Joaquin River in Central Fresno and Madera Counties
downstream of Friant Dam, as elevated water releases continue
there.

Models remain in moderately good agreement for the latter half of
the week. The upper ridge is progged to build only slightly before
another shortwave trough tracks into the west coast. Temperatures
are expected to climb only slightly through the end of the week
with no more than a few triple digit highs in the Desert areas.
No thunderstorms are progged through the end of the week.




&&

.AVIATION...
Isolated thunderstorms are possible over the higher elevations of
the Southern Sierra Nevada from 21z Sunday to 04z Monday.
Otherwise, VFR conditions will prevail across the central CA
interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Sunday June 25 2017... Unhealthy for sensitive groups in
Fresno... Kern and Tulare Counties and Sequoia National Park and
Forest.
Further information is available at Valleyair.org

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is medium.

Certainty levels include low...medium...and high. Please visit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
Heat Advisory until 9 PM PDT this evening CAZ089>095.

Excessive Heat Warning until 9 PM PDT this evening CAZ098-099.

&&

$$

public...JEB
avn/fw...DCH
synopsis...JEB

weather.gov/hanford



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.