Arnold, CA…Flash Flood & Thunderstorm Warnings in Effect. Details are below…

Flash Flood Watch
Flood Watch
National Weather Service Sacramento CA
1143 AM PDT Mon Aug 21 2023

CAZ067-069-220700-
/O.CON.KSTO.FF.A.0003.230821T2000Z-230822T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Motherlode-West Slope Northern Sierra Nevada-
Including the cities of Grass Valley, Blue Canyon, and Jackson
1143 AM PDT Mon Aug 21 2023

…FLASH FLOOD WATCH FOR THE MOSQUITO AND CALDOR WEST BURN SCARS
REMAINS IN EFFECT THROUGH THIS EVENING…

* WHAT…Flash flooding and debris flows caused by excessive
rainfall from thunderstorms continue to be possible over the
Mosquito and Caldor West burn scars.

* WHERE…A portion of northern California, including the following
areas, Motherlode and West Slope Northern Sierra Nevada.

* WHEN…Through this evening.

* IMPACTS…Thunderstorms with heavy rainfall over the Mosquito and
Caldor West burn scars are expected up to and during the period of
the watch. The heaviest rainfall is expected between 4 PM and 8
PM. Residents near the Mosquito and Caldor West burn scars should
prepare for potential flooding impacts. Be sure to stay up to date
with information from local authorities. Heavy rainfall could
trigger flash flooding of low-lying areas, urbanized street
flooding, and debris flows in and near recent wildfire burn scars.

* ADDITIONAL DETAILS…
– National Weather Service Meteorologists are forecasting heavy
rainfall over the Mosquito and Caldor West burn scars, which
may lead to flash flooding and debris flows.
– http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS…

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IDS

Special Weather Statement
Special Weather Statement
National Weather Service Sacramento CA
341 PM PDT Mon Aug 21 2023

CAZ066>069-212315-
Northeast Foothills/Sacramento Valley CA-Motherlode CA-
West Slope Northern Sierra Nevada CA-
Western Plumas County/Lassen Park CA-
341 PM PDT Mon Aug 21 2023

…Strong thunderstorms will impact portions of central Tuolumne,
southern Plumas, west central Alpine, El Dorado, northeastern Placer,
southeastern Butte, northeastern Calaveras, Sierra, northeastern
Yuba, Nevada and central Amador Counties through 415 PM PDT…

At 340 PM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from Scotts Flat to near Angels City. Movement was
north at 25 mph.

HAZARD…Winds in excess of 30 mph and half inch hail.

SOURCE…Radar indicated.

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

Locations impacted include…
Grass Valley, Placerville, Sonora, Brush Creek Rs, Downieville, San
Andreas, Cisco, Calaveras Big Trees SP, Blue Canyon, Big Bend Summit,
Bear Valley, Pulga, Sierra City, Baxter, Quincy, Lake Of The Pines,
East Quincy, Colfax, Stirling City and Rail Road Flat.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

If outdoors, consider seeking shelter inside a building.

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

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

&&

LAT…LON 3790 12029 3818 12067 3932 12121 3996 12162
3991 12076 3971 12072 3970 12062 3807 11985
3790 11989 3789 11983 3788 11983
TIME…MOT…LOC 2240Z 162DEG 20KT 3927 12093 3814 12052

MAX HAIL SIZE…0.50 IN
MAX WIND GUST…30 MPH

$$

Rowe/KF/JW/EK