Flash Flood Warning 59, NWS Hanford, CA

Area Forecast Discussion
National Weather Service Hanford CA
1254 PM PDT Mon Aug 21 2023

.SYNOPSIS...
Remnants of Tropical Storm Hilary will continue to bring
widespread rainfall to the area through this morning and into
tonight. Thunderstorms are also possible this afternoon. The
system is expected to exit our area Tuesday morning and dry
conditions will begin to prevail Wednesday with some showers
along the Sierra Nevada crest possible on Thursday and Friday.
Flooding will continue to impact the area as the water from
yesterday's excessive rainfall recedes.

&&

.DISCUSSION...
Current satellite imagery shows a broad area of low pressure
spinning off the California coastline. Abundant moisture and
instability from Hilary are present over our CWA with Surface
Based CAPE sitting over 1000 J/kg. The HRRR runs this morning have
been showing quite an active afternoon with thunderstorms firing
off by noon (which are ongoing as we speak) and trekking across
the valley this afternoon into the evening hours. Expect hail of
at least 1/2 inch and strong winds to 50 mph with some of these
storms capable of producing larger hail and stronger winds.
Rotation has been observed on radar already this afternoon and
funnel clouds and/or brief touchdowns of tornadoes is certainly
possible.

With the amount of rainfall some areas received yesterday, any
precipitation with showers or thunderstorms today could help to
exasperate more flooding concerns. Be weary of any standing water
you encounter and always head on the side of caution and avoid
driving through any amount of water in roadways.

After this afternoon, expect conditions to begin to taper back to
seasonal norm for our area with temperatures rebounding back to
near normal and much drier conditions present. Longer range models
are showing a possible heat up by next Tuesday.

&&

.AVIATION...
Widespread MVFR and areas of mountain obscuring IFR conditions in
and near showers and thunderstorms across Kern County mountains
and Sierra Nevada. Showers and thunderstorms will also impact the
remainder of the Central CA interior with areas of MVFR.

&&

.AIR QUALITY ISSUES...
ISSUED:  08/20/2023 13:29
EXPIRES: 08/21/2023 23:59
None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is medium.
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.html for additional information
and/or to provide feedback.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
None.
&&

JMC

weather.gov/hanford

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Preliminary Local Storm Report
National Weather Service Hanford CA
207 PM PDT Mon Aug 21 2023

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

0141 PM     Flood            9 S Los Banos           36.93N 120.84W
08/21/2023                   Merced             CA   911 Call Center

            Report of roadway flooding.

&&

JMC

Special Weather Statement
National Weather Service San Joaquin Valley CA
220 PM PDT Mon Aug 21 2023

CAZ300-301-305-212215-
West Side of Fresno and Kings Counties CA-Los Banos - Dos Palos CA-
West Side Mountains north of 198 CA-
220 PM PDT Mon Aug 21 2023

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL FRESNO COUNTY
THROUGH 315 PM PDT...

At 220 PM PDT, Doppler radar was tracking a strong thunderstorm 14
miles northwest of Cantua Creek, or 35 miles southwest of Madera,
moving northeast at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Panoche Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3654 12054 3660 12060 3679 12053 3668 12038
TIME...MOT...LOC 2120Z 215DEG 8KT 3660 12054

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

KM

Special Weather Statement
National Weather Service San Joaquin Valley CA
223 PM PDT Mon Aug 21 2023

CAZ301-302-212200-
Los Banos - Dos Palos CA-Merced - Madera - Mendota CA-
223 PM PDT Mon Aug 21 2023

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN MADERA...CENTRAL
MERCED AND NORTHWESTERN FRESNO COUNTIES THROUGH 300 PM PDT...

At 223 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles east of South Dos Palos, moving north at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This storm will remain over mainly rural areas of southwestern
Madera, central Merced and northwestern Fresno Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3691 12044 3694 12059 3710 12056 3706 12037
TIME...MOT...LOC 2123Z 201DEG 11KT 3699 12050

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

AS

Special Weather Statement
National Weather Service San Joaquin Valley CA
231 PM PDT Mon Aug 21 2023

CAZ308-309-313-212200-
Buena Vista CA-Buttonwillow - Lost Hills - I5 CA-
West Side Mountains South of 198 CA-
231 PM PDT Mon Aug 21 2023

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL KERN COUNTY THROUGH
300 PM PDT...

At 230 PM PDT, Doppler radar was tracking a strong thunderstorm over
Derby Acres, moving north at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
McKittrick and Derby Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3516 11956 3518 11956 3517 11960 3520 11967
      3526 11967 3526 11973 3546 11968 3536 11940
      3516 11955
TIME...MOT...LOC 2130Z 201DEG 11KT 3526 11961

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

AS

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