California, 2021

Drought in California, September 1 to 30, 2021

September 1 to 30, 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 Aug 31, 12:58 PM PST, 11 hours 2 minutes earlier.

Area forecast discussion, Aug 31, 12:58 PM PST, 11 hours 2 minutes before
Area Forecast Discussion
National Weather Service Sacramento CA
158 PM PDT Tue Aug 31 2021

.SYNOPSIS...
Gusty southwest winds will result in critical fire weather
conditions over portions of the northern Sierra and southern
Cascades through tomorrow. Cooler temperatures expected through
Thursday, with a warming trend returning Friday into the weekend.

&&

.DISCUSSION...
Winds have increased early this afternoon over higher terrain with
widespread gusts ranging from 15 to 30 mph reported, locally higher.
The fire plume from the Caldor Fire is noted on radar, with visible
satellite showing a defined pyrocumulus cloud over the area. To the
north, the Dixie continues to burn hot with smoke plumes bringing
widespread smoke to areas northeast of the fire. Humidity values
this afternoon are reaching into the single digits and teens in much
of the mountains and foothills, with higher values noted in the
Valley near Delta influenced areas. A Red Flag Warning continues for
the Northern Sierra and Southern Cascades through tonight due to
these dry conditions and winds.

The trough located over British Columbia deepens slightly tonight
and tomorrow bringing continued gusty winds tomorrow, mainly in the
afternoon and evening. The strongest winds look to continue mainly
over the Northern Sierra this day, and this is where the Red Flag
Warning continues through tomorrow evening due to the potential for
the rapid spread of new of existing wildfires. Gusts tomorrow may be
slightly less than today, although still may see some gusts from 20
to 25 mph, with the highest values on ridgetops.

As for smoke, it looks to linger in portions of the northern and
central Valley through at least tomorrow, along with anywhere near
area wildfires. Winds become a bit lighter and more terrain driven
Thursday and Friday which may lead to smoke or haze in the
foothills/Valley, especially in the mornings.

Finally, temperatures cool around 8 to 12 degrees below normal
tomorrow, with only slightly warmer temperatures on Thursday. A
warming trend to slightly above normal temperatures begins on Friday
and continues into the weekend.

&&

.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)...
Ensemble guidance is in decent agreement high pressure will build
over the region throughout the extended forecast period. A low
pressure area is also forecast to cut off offshore from Southern
California. This low is expected to weaken and remain offshore.
Therefore, decent confidence in a gradual warming trend into next
week is forecast over Northern California.

&&

.AVIATION...
MVFR to IFR at times for the northern Sacramento Valley terminals
next 24 hrs due to area wildfire smoke. VFR expected at other
Valley terminals. MVFR to locally IFR possible near active
wildfires, particularly over the Sierra. Gusts 15 to 30 kts
vicinity Delta and high Sierra. Elsewhere, winds generally under
12 kts.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 11 PM PDT this evening for Burney Basin
and Northeast Plateau in Shasta County Including Northwest
Lassen NF north of Lassen NP-Eastern Portion of Shasta/Trinity
NF-Northern Motherlode From 1000 to 3000 Ft. Includes portions
of Nevada-Yuba-Placer-Amador and ElDorado Units-Northern Sierra
Foothills from 1000 to 3000 Ft. Includes portions of Shasta-
Trinity and Butte Units-Northern Sierra Including Lassen NP and
Plumas and Lassen NF/S West of the Sierra Crest (West of Evans
Peak-Grizzly Peak-Beckworth Peak)-Northern Sierra Including the
Tahoe and ElDorado NF/S West of the Sierra Crest-Southern
Motherlode From 1000 to 3000 Ft. Includes portions of Calaveras-
Tuolumne Unit-Stanislaus NF West of the Sierra Crest.

&&

Event by event

12 drought. Local standard time, as filed.

Drought, Shasta Lake/North Shasta County

When
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Shasta Lake/North Shasta County forecast zone
Reported by
Drought Monitor

For the month of September, the U.S. Drought Monitor kept 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Burney Basin/Eastern Shasta County forecast zone
Reported by
Drought Monitor

For the month of September, the U.S. Drought Monitor kept 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Northern Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Mountains Southwestern Shasta County to Western Colusa County forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Northeast Foothills/Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Mt Shasta/Western Plumas County forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Central Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Southern Sacramento Valley forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Carquinez Strait and Delta forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Northern San Joaquin Valley forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Motherlode/Camptonville to Groveland forecast zone
Reported by
Drought Monitor

For the month of September, 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
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
West Slope Northern Sierra Nevada forecast zone
Reported by
Drought Monitor

For the month of September, 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, September 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: 987045, 987046, 987047, 987048, 987049, 987050, 987051, 987052, 987053, 987054, 987055, 987056.