Flash Flood Warning 16, NWS Hanford, CA

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
311 PM PDT Thu May 9 2019

.SYNOPSIS...
A low pressure system will drop southward from the northern Rocky
Mountain region into our area by this evening and bring unsettled
showery conditions to the central CA interior by this afternoon
and much cooler temperatures by Friday. Thunderstorms will be
possible across our area today and again on Friday.

&&

.DISCUSSION...
Showers and thunderstorms developed over the Sierra Nevada this
afternoon as upper level energy drops south from the Great Basin.
Radar estimated high rain rates over half inch per hour with the
stronger storms. Storms are moving very slow with a weak mid
level storm flow. This will increase the threat of flooding over
parts of the southern sierra through the evening. Satellite
precipitable water estimates are fairly high across the district
near three quarters of an inch which is 2-3 sigmas above normal.
These high PW remains across central CA through saturday. Snow
levels starting fairly high near 9kft will increase the likelihood
of flooding in the sierra rivers and streams with rain on top of the
sierra snowpack. The snow levels lower to near 7500 feet towards
by Friday morning 12z Friday and start to rise Friday afternoon.
Will continue with a winter weather advisory as several inches of
accumulating snow will be probable over the high sierra country.
Higher resolution models indicate the focus for precipitation
shifting into the south valley and Tehachapi Mountains overnight
into Friday morning with the upper low moving slowly south and
closing off over the central valley tonight, then moving to near
point conception Friday afternoon. This should favor the south
valley for rainfall as storms could move off the sierra and
tehachapi mountains as the storm steering flow turns NE to E.
Convective storms development will favor the Kern County area
Friday afternoon and evening as the low moves over the Channel
Islands. A few storms may be possible towards the Tehachapis
Saturday with day time instability and the low finally moving
onshore through Baja.

A ridge builds from the Pacific over North CA for early next week
bring a dry and warming trend. A Pacific trough is progged to
reach the western Conus coast by the middle of next week which may
bring another round of cooler temperatures and unsettled weather
across central CA.

&&

.AVIATION...
An incoming low pressure system will produce scattered showers at
times through the next 24 hours. Isolated afternoon and evening
thunderstorms are possible across the central CA interior through
06Z Friday and again after 18Z Friday. This will create areas of
mountain obscuring IFR over the Sierra and Kern County mountains,
while areas of MVFR with local IFR conditions can be expected in the
San Joaquin Valley and desert areas. Otherwise, VFR conditions are
expected during the next 24 hours.

&&

.AIR QUALITY ISSUES...
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
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
Winter Weather Advisory until 11 PM PDT Friday ABOVE 8000 FEET
FOR THE CAZ192>194.

&&

public...MV
avn/fw...BS
synopsis...MV

weather.gov/hanford

Special Weather Statement
National Weather Service San Joaquin Valley CA
604 PM PDT THU MAY 9 2019

CAZ195-196-198-199-100145-
Indian Wells Valley CA-Lake Isabella CA-Kern County Desert CA-
Tehachapi Area CA-
604 PM PDT THU MAY 9 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN KERN COUNTY UNTIL
645 PM PDT...

At 604 PM PDT, Doppler radar was tracking a strong thunderstorm 13
miles southwest of Inyokern, or 18 miles southwest of Ridgecrest,
moving north at 10 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

This storm will remain over mainly rural areas of northeastern Kern
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3539 11780 3544 11814 3565 11816 3561 11774
TIME...MOT...LOC 0104Z 190DEG 7KT 3549 11795

ab

Special Weather Statement
National Weather Service San Joaquin Valley CA
656 PM PDT THU MAY 9 2019

CAZ194-195-100245-
Lake Isabella CA-Sequoia Kings CA-
656 PM PDT THU MAY 9 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN KERN AND
SOUTHEASTERN TULARE COUNTIES UNTIL 745 PM PDT...

At 656 PM PDT, Doppler radar was tracking a strong thunderstorm 22
miles east of East Porterville, or 26 miles east of Porterville,
moving east at 10 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Johnsondale, Uhl, Pascoes and Kernville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3581 11868 3606 11864 3602 11830 3577 11835
TIME...MOT...LOC 0156Z 281DEG 9KT 3593 11859

ab

Special Weather Statement
National Weather Service San Joaquin Valley CA
713 PM PDT THU MAY 9 2019

CAZ190-192-100300-
Central Sierra CA-Central Sierra Foothills CA-
713 PM PDT THU MAY 9 2019

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MARIPOSA...CENTRAL MADERA
AND NORTHERN FRESNO COUNTIES UNTIL 800 PM PDT...

At 711 PM PDT, trained weather spotters reported a strong
thunderstorm, producing pea sized hail, near Bootjack, or 8 miles
southwest of Yosemite South Entrance, moving to the south at around
15 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Yosemite South Entrance, Oakhurst, Yosemite Lakes, Bootjack, Metcalf
Gap, Batterson, Fish Camp, Wawona, Coarsegold, Bass Lake, Jerseydale,
Ahwahnee, Mariposa Grove and Auberry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3760 11994 3763 11964 3712 11949 3709 11981
TIME...MOT...LOC 0211Z 354DEG 32KT 3745 11976

BS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HANFORD CA
716 PM PDT THU MAY 9 2019

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

0708 PM     HAIL             PONDEROSA               36.11N 118.53W
05/09/2019  E0.25 INCH       TULARE             CA   TRAINED SPOTTER

            A TRAINED STORM SPOTTER REPORTED PEA SIZED
            HAIL IN PONDEROSA AT 708 PM PDT.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HANFORD CA
743 PM PDT THU MAY 9 2019

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

0732 PM     DEBRIS FLOW      5 NNW MIDPINES          37.61N 119.97W
05/09/2019                   MARIPOSA           CA   LAW ENFORCEMENT

            THE CALIFORNIA HIGHWAY PATROL REPORTED THAT
            CALTRANS DISTRICT 10 IS CLOSING STATE ROUTE
            140 NEAR BEAR CREEK DUE TO DEBRIS FLOW
            FLOODING.

&&

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