Flash Flood Warning 39, NWS Hanford, CA

099 
WGUS76 KHNX 100117
FFSHNX

Flash Flood Statement
National Weather Service San Joaquin Valley CA
617 PM PDT SAT SEP 9 2017

CAC029-100125-
/O.EXP.KHNX.FF.W.0039.000000T0000Z-170910T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kern CA-
617 PM PDT SAT SEP 9 2017

...THE FLASH FLOOD WARNING FOR EAST CENTRAL KERN COUNTY HAS
EXPIRED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3529 11770 3529 11776 3549 11773 3551 11798
      3560 11804 3568 11777 3553 11764

$$

CB

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
429 PM PDT Sat Sep 9 2017

.UPDATE...Updated air quality issues.

&&

.SYNOPSIS...
An upper level low pressure system off the central California
coast will be nearly stationary this weekend through the middle
of next week. Increased southerly flow will bring tropical
moisture northward across the region Sunday and Monday with
increased chances of showers and thunderstorms. Low will move
inland on Wednesday.

&&

.DISCUSSION...
Cut-off low off the west coast making today's forecast a bit more
challenging while raising the threat of monsoonal convection.
Current position of the low just southwest of Monterey is keeping
the flow aloft over the district under a slight southwesterly
component. This direction in the flow is placing the bulk of
today's monsoonal moisture surge over the Colorado River Valley
– where convection is already occurring. Satellite Precip-Water
imagery is showing the plume of moisture extending from Yuma, AZ
through Las Vegas, as the gradient of drier air extends toward the
Kern County Desert. Upper air observations from this morning
(1200 UTC) show the desert southwest locations reporting precip-
water values at or near their climo max values. Therefore, while
models do show significant instability over the Central California
Interior, the best values currently reside over the Desert
Southwest where the plume of moisture is also located. Yet, with
monsoonal moisture surging northward, afternoon convection can not
be ruled out as any little piece of energy rotating around the
closed low can fire-up a thunderstorm over the mountains.

Later tonight, models showing high confidence in shifting the low
southward to a position about 300 miles west of San Diego. This
change in the position of the low's center will shift the flow
aloft to a more southerly to southeasterly direction. In addition,
possible difluent flow over the district late tonight and Sunday
may help support better precipitation efficiency during the heavy
precipitation event. Therefore, will maintain the Flash Flood
Watch for Sunday and Sunday Night across the Kern County Mountains
and Desert. Once the flow turns more southeasterly, precip-water
values of over one inch will surge toward Central California.
Along with pieces of vort max energy rotating around the closed
low and some orographic effects could provide for heavy rain in a
flash flood prone areas.

After dropping toward Southern California, the cut-off low begins
lifting northward back to the Monterey area early next week.
While confidence in this solution decreases, model consensus does
lean toward this possibility. While not eliminating the threat of
thunderstorms, the threat will become more isolated toward mid-
week. Therefore, by mid-week, models still progging the closed low
being caught-up in the digging trof that will push into the
Pacific Northwest by Wednesday night. With confidence levels at
around the medium level on a low passage by mid-week, will
maintain the threat of precipitation through at least Wednesday.
By Thursday, the cut-off low finally leave the region as a
disturbance moves into the Pacific Northwest/Inter-mountain region
and turns to flow over Central California to an onshore (westerly
to northwesterly) direction. Cooling that will be felt early in
the week as the low pushes through will be re-enforced once the
onshore flow kicks-in. At that point, the threat of convection
will finally diminish through the end of the forecast period. Weak
ridge next weekend allow slow down the cooling trend, but another
trof in the long term progs may prevent any big warm-up beyond
day seven.

&&

.AVIATION...
Areas of smoke from wildfires will continue to produce MVFR
visibility over the southern Sierra Nevada and adjacent foothills.
Scattered thunderstorms in the afternoon over the Southern Sierra
Nevada producing local mountain obscurations through 04Z Sun.
Otherwise, VFR conditions can be expected over the Central CA
Interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Sunday September 10 2017... Unhealthy for sensitive groups in
Fresno... Kern... Kings 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...
Flash Flood Watch from Sunday morning through late Sunday night
CAZ095-099.

&&

public...Molina
avn/fw...Riley/BSO
synopsis...Molina

weather.gov/hanford

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HANFORD CA
441 PM PDT SAT SEP 9 2017

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

0400 PM     FLASH FLOOD      7 SW RIDGECREST         35.55N 117.73W
09/09/2017                   KERN               CA   LAW ENFORCEMENT

            CHP REPORT OF FLASH FLOODING ON SOUTH BROWN
            ROAD BETWEEN WIKNICH ROAD AND STATE ROUTE
            395 SOUTH OF INYOKERN. ROAD WAS CLOSED DUE
            TO THE FLOODING.

&&

JA