California, 2021

Drought in California, August 1 to 31, 2021

August 1 to 31, 2021 · NWS STO · 12 events in 12 counties and zones

Northern California typically experiences a wet season, October through May, and a dry season May through September. Last year's water year, October 2019 through September 2020, was one of the driest on records.

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
12

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS STO wrote it up.

Northern California typically experiences a wet season, October through May, and a dry season May through September. Last year's water year, October 2019 through September 2020, was one of the driest on records. This likely contributed to the U.S. Drought Monitor's decision to place portions of interior northern California into extreme drought on September 29, 2020. Portions of Shasta, Tehama, Butte, Glenn, Colusa, Yolo, Solano, Yuba, Nevada, and Sacramento counties remain in extreme drought. The rest of interior northern California was placed into severe drought (D2) on December 8; however, the state of California has not announced that these locations are in drought. On 4/21/2021 the Biden-Harris administration announced the formation of an Interagency Working Group to address worsening drought conditions in the West. On 5/10/2021 Governor Gavin Newsom significantly expanded his April 21 drought emergency proclamation to include Klamath River, Sacramento-San Joaquin Delta and Tulare Lake Watershed counties where accelerated action is needed to protect public health, safety and the environment. In total, 41 counties are now under a drought state of emergency, representing 30 percent of the state’s population. By late June more wildlife was observed in urban interfaces than normal, notably bears and rattlesnakes, in search of wetter, cooler conditions. Widespread water theft has also been reported. On July 8th, the Governor of California asked for all Californian's including businesses, to voluntarily reduce water usage by 15%. On August 10th DWR reported the drought has led to a 123% increase in the number of acres burned this year, compared to 2020. DWR also reported that the low reservoir water levels have also affected energy supplies, agriculture, communities and state recreation parks.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sacramento, CA wrote its last area forecast discussion before the first event at Jul 31, 9:42 PM PST, 2 hours 18 minutes earlier.

Area forecast discussion, Jul 31, 9:42 PM PST, 2 hours 18 minutes before
Area Forecast Discussion
National Weather Service Sacramento CA
1042 PM PDT Sat Jul 31 2021

.SYNOPSIS...
Late day mountain thunderstorm chances expected through the
weekend. Near normal temperatures will continue through the rest
of the weekend into next week.

&&

.DISCUSSION...
The Evening Update: Cloud cover from the Desert SW has been shifting
Ewd this evening as the Ern Pac trof moves inside 130W. This will be
the trend into Sun as the Sierra convection will be farther E, near
the Sierra Crest and mostly to the east, as SWly flow will prevail
over Norcal. This will push smoke from the Dixie Complex generally
off to the NE as well.

Weakening of the ridge has allowed virtually the entire CWA to enjoy
some cooling. Save for KSMF at 05z, the other sites were running
from 1 to 11 degrees cooler, albeit the Delta Breeze is weaker and
the marine layer just slightly deeper. Temps on Sun expected to be
similar to today in the Delta influenced areas and near their
respective normals while again reaching into the triple digits in
the Nrn Sac Vly. Forecasts suggest energy within the Ern Pac trof W
of 130W will be dropping Swd on Sun which should slow the Ewd
progression of the trof allowing for warmer temps away from the
Delta influence.  JHM

.Previous Discussion...
Upper level ridging is weakening, with a little cooler onshore flow
spreading in. South to west winds are generally gusting up to 15 to
20 mph, locally up to 30 mph in the Delta. Temperatures are less hot
this afternoon by 5 to 10 degrees compared to 2 pm yesterday. For
the northern Sacramento Valley it was seasonably hot at 100 for
Redding, 97 for Red Bluff.

Monsoonal moisture continue to bring afternoon and evening shower
and thunderstorm chances. The main areas of development are around
Lassen National Park/Burney Basin and the Sierra south of Highway
50. Shear is limited and storms are tending to pop up and collapse
fairly quickly. Some brief heavy rain and small hail are possible
into this evening, though, so be prepared if outdoors or driving
in the area. Strongest storms so far have been further to the
south in Yosemite or east of the crest. One last afternoon of
thunderstorms is possible on Sunday, followed by drier weather for
the rest of the week as monsoonal moisture shifts to the east.

Southwesterly flow continues next week with near normal
temperatures.

&&

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)...

Clusters and ensemble guidance continue to favor dry, southwest
flow aloft through the end of next week with an upper level ridge
parked over the Desert Southwest / southern California and a
trough off the West Coast. National Blend of Models has a moderate
spread in the 25th to 75th percentile temperatures by Thursday --
96 to 103 deg F for KRDD and 93 to 100 deg F for KSAC. A few
clusters hint at the shortwave trough clipping far northwest
California late next week, though still plenty of uncertainty this
far out. Overall generalization for mid/late next week has
temperatures within about 5 deg F of normal with occasional breezy
conditions around the Delta. // Rowe

&&

.AVIATION...

VFR conditions expected at the TAF sites the next 24 hours. Areas
of smoke near the Dixie and McFarland fires will bring localized
MVFR conditions. Southerly winds 7-15 knots, locally stronger in
the Delta region. Isolated-scattered showers and thunderstorms
over the mountains.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

Event by event

12 drought. Local standard time, as filed.

Drought, Shasta Lake/North Shasta County

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Shasta Lake/North Shasta County forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor expanded D4 in the far northwestern portion of Shasta County in Zone 13 which covers northwestern Shasta County. The majority of zone 13 was in exceptional drought (D4) with the remaining areas of Zone 13 in extreme drought (D3). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of Zone 13 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. As of July 1st, fire restrictions on public lands were put in place until further notice. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed. Concern was noted that nearly all endangered winter-run Chinook salmon could perish this fall. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems.

Drought, Burney Basin/Eastern Shasta County

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Burney Basin/Eastern Shasta County forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor expanded D4 west in zone 14 which covers eastern Shasta County. The majority of zone 14 was in exceptional drought (D4) with the remaining areas of Zone 14 in extreme drought (D3). They mentioned that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 14 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. On July 1st, fire restrictions on public lands were put in place until further notice. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems.

Drought, Northern Sacramento Valley

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Northern Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept all of zone 15, which includes portions of Shasta and Tehama counties, in exceptional drought (D4). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. Some of the impacts the region continues to see include: reduced forage, decreased stock weights, selling of livestock, livestock stress, reduced grazing on public lands, reduced market price for cattle, and increased pricing for small grain and hay crops. The area also saw: decreased water allocation, hauling of water, increased groundwater use, land subsidence, low to dry rivers/ponds/springs, dry wells, and installation of new wells. All of zone 15 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. As of July 1st, fire restrictions on public lands were put in place until further notice. An emergency resolution made on July 14th by the Tehama County Board of Supervisors continues that allows residents with dry wells to purchase water directly from the county. Farmers planted about 100,000 fewer acres of rice in the Sacramento Valley, leading to less food and increased potential for disease for birds migrating through the Pacific Flyway. Concern was noted that nearly all endangered winter-run Chinook salmon could perish this fall. Drought has also reduced California’s almond harvest by 13%. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Mountains Southwestern Shasta County to Western Colusa County

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Mountains Southwestern Shasta County to Western Colusa County forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor continued exceptional drought (D4) for roughly half of zone 63, which covers western Tehama, Glenn, and Colusa counties, and kept all of the remaining parts of the Zone 63 in extreme drought (D3). They continue to mention drought impacts including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 63 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. On July 1st, fire restrictions on public lands were put in place until further notice. Glenn County bottled water distribution program that started on July 12th for residents impacted by dry wells continues. The 45-day moratorium on agricultural well drilling in Glenn County that started on July 21st continues. An emergency resolution made on July 14th by the Tehama County Board of Supervisors continues that allows residents with dry wells to purchase water directly from the county. Ranchers also reported a 10-25% reduction in herds due to feed shortages. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Northeast Foothills/Sacramento Valley

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Northeast Foothills/Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept all of Zone 66 in exceptional drought (D4), which covers the northeast foothills and portions of the Sacramento Valley. They mentioned that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 66 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. As of July 1st, fire restrictions on public lands were put in place until further notice. Butte county continues a local drought emergency in the county declared in July. An emergency resolution made on July 14th by the Tehama County Board of Supervisors continues that allows residents with dry wells to purchase water directly from the county. Ranchers also reported a 10-25% reduction in herds due to feed shortages. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Mt Shasta/Western Plumas County

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Mt Shasta/Western Plumas County forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor did not make any changes to Zone 68. The majority of the Zone is in exceptional drought with includes the eastern portions of Tehama, Butte and Shasta counties (Lassen National Park) and western Plumas County. Extreme drought (D3) continued for the remainder of Zone 68, which covers west central Plumas County. They mentioned that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 68 is in the official drought emergency proclamation. The countywide drought emergency declared by the Shasta County Board of Supervisors in June continues, including the water conservation program. As of July 1st the Nevada Irrigation District approved a mandatory 20 percent water-use reduction for both raw and treated water customers. As of July 1st, fire restrictions on public lands were put in place until further notice. Butte county continues a local drought emergency in the county declared in July. An emergency resolution made on July 14th by the Tehama County Board of Supervisors continues that allows residents with dry wells to purchase water directly from the county. August 11th DWR, in coordination with the State Water Resources Control Board, directed $25 million to 10 small water systems including Shasta County. The funds will support a range of projects including emergency water system repairs, infrastructure such as new wells and water storage tanks, and improvements to intakes and distribution systems. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Central Sacramento Valley

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Central Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor continued to have all of zone 16 in exceptional drought (D4). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. Some of the impacts to the region included: reduced forage, decreased water allocation, decreased stock weights, selling of livestock, completely dry wells, hauling water, and low to dry rivers/ponds/springs. All of zone 16 is in the official drought emergency proclamation. On July 1st, fire restrictions on public lands were put in place until further notice. The Nevada Irrigation District continues its mandatory 20 percent water-use reduction for both raw and treated water customers. Glenn County bottled water distribution program that started on July 12th for residents impacted by dry wells continues. The 45-day moratorium on agricultural well drilling in Glenn County that started on July 21st continues. Butte county continues a local drought emergency in the county declared in July. By July 23rd The Office of Emergency Services reported 117 dry wells, 75% of which were family homes. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed. Concern was noted that nearly all endangered winter-run Chinook salmon could perish this fall. By July 23rd, all paved boat ramps on Lake Oroville were closed due to low water levels. On August 5th DWR State Water Project operations managers reported the Hyatt Powerplant at Lake Oroville is offline due to falling lake levels. This is the first time Hyatt Powerplant has gone offline as a result of low lake levels. Drought has also reduced California’s almond harvest by 13%. Farmers planted about 100,000 fewer acres of rice in the Sacramento Valley, leading to less food and increased potential for disease for birds migrating through the Pacific Flyway.

Drought, Southern Sacramento Valley

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Southern Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor continued to have all of zone 17, which includes portions Yolo, Solano, Sutter, and Sacramento County in exceptional drought (D4). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. The area saw: reduced forage, decreased water allocation, decreased stock weights, selling of livestock, hauling of water, low rivers/ponds/springs, and installation of new wells. All of zone 17 is in the official drought emergency proclamation. The Nevada Irrigation District continues its mandatory 20 percent water-use reduction for both raw and treated water customers. As of July 7th, the city of Sacramento asked residents and businesses to voluntarily reduce their water use by 10 percent. As of July 28th a local drought emergency proclaimed in Yolo County continues after one-fifth of the county’s wells reached an all-time low. Concern was noted that nearly all endangered winter-run Chinook salmon could perish this fall. Drought has also reduced California’s almond harvest by 13%. Farmers planted about 100,000 fewer acres of rice in the Sacramento Valley, leading to less food and increased potential for disease for birds migrating through the Pacific Flyway. Ranchers are seeing 10-25% reduction in herds due to feed shortages. By July, the waters of Folsom Lake receded low enough to reveal Mormon Island, a Gold Rush village, settled in the 1840s by prospectors. Starting August 9, Roseville residents are required to reduce their water use by 20%. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Carquinez Strait and Delta

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Carquinez Strait and Delta forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept all of zone 18 in exceptional drought (D4). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. Farmers north and south of the Sacramento-San Joaquin River Delta will continue to receive no water from the Central Valley Project. All of zone 18 is in the official drought emergency proclamation. The Delta cross channel gates remain closed. Concern was noted that nearly all endangered winter-run Chinook salmon could perish this fall. Drought has also reduced California’s almond harvest by 13%. Farmers planted about 100,000 fewer acres of rice in the Sacramento Valley, leading to less food and increased potential for disease for birds migrating through the Pacific Flyway. Ranchers are seeing 10-25% reduction in herds due to feed shortages. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Northern San Joaquin Valley

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Northern San Joaquin Valley forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept the majority of Zone 19 in exceptional drought (D4) with only a small portion of the far southwestern part of Stanislaus County of Zone 19 in extreme drought (D3). They continue to mention that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 19 is in the official drought emergency proclamation. Ranchers are seeing 10-25% reduction in herds due to feed shortages. Drought has also reduced California’s almond harvest by 13%. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, Motherlode/Camptonville to Groveland

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
Motherlode/Camptonville to Groveland forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept all of Zone 67 in exceptional drought (D4), which covers the Motherlode. They mentioned that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. The area continued to see: reduced forage, decreased water allocation, decreased stock weights, and hauling of water. All of zone 67 is in the official drought emergency proclamation. The Nevada Irrigation District continues its mandatory 20 percent water-use reduction for both raw and treated water customers. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

Drought, West Slope Northern Sierra Nevada

When
August 1, 12:00 AM PST to August 31, 11:59 PM PST
Where
West Slope Northern Sierra Nevada forecast zone
Reported by
Drought Monitor

For the month of August, the U.S. Drought Monitor kept roughly half of zone 69 in exceptional drought (D4), which covers the upper foothills into the west slope of the Sierra Nevada. The higher elevations of the eastern portions of the continued remained in extreme drought (D3). They mentioned that we will see drought impacts expand into the summer, including but not limited too: agriculture, water supplies, recreation, and ecosystems. All of zone 69 is in the official drought emergency proclamation. On July 1st, fire restrictions on public lands were put in place until further notice. Effective on August 19, the State Water Resources Control Board released an emergency curtailment order that would deprive thousands of farmers of the use of rivers and streams in the Sacramento-San Joaquin Delta watershed.

What these are

Drought
A drought reaching severe (D2) or worse on the US Drought Monitor, or with notable impacts.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in California in 2021Every state in 2021This day in weather historyWarnings in California, August 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 986439, 986440, 986467, 986475, 986993, 986994, 986995, 986996, 986997, 986998, 986999, 987000.