California, 2015

Drought in California, September 1 to 30, 2015

September 1 to 30, 2015 · NWS STO · 7 events in 7 counties and zones

The long term drought continued through September with little change. Reservoirs across the area were continuing to drop well below normal levels.

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
7

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.

The long term drought continued through September with little change. Reservoirs across the area were continuing to drop well below normal levels. All major reservoirs across the state were less that 40% of capacity. Folsom Lake was down to 18% of capacity, approaching near-record low levels for September, seen last in 1977. 70 homes in Butte County are without well water. The numbers reflect cumulative reports of household water shortages by county reported to the state since January 2014.

A growing number of residential wells are running dry. The Household Water Supply Shortage Reporting System showed 70 homes in Butte County without well water. Other counties reported residential water shortages as follows: Tuolumne 333, Glenn County 27; Shasta County 2; Tehama County 34.

Extreme drought continued to be detected by the U.S. Drought Monitor across most the region, with exceptional drought for the northern San Joaquin Valley, the central and southern Sacramento Valley, the Burney Basin and the Sierra.

The continued dry weather and periods of hot temperatures left vegetation parched and ready to burn. Wildfire activity was far above normal levels in September, with the Valley Fire becoming the 3rd most destructive wildfire in California history, and the Butte Fire the 7th most destructive.

Governor Jerry Brown declared a drought emergency for the entire state of California January 17, 2014 and this continued to be in effect.

Local Emergency Proclamations have been issued for El Dorado, Glenn, Lake, Plumas, San Joaquin, Shasta, Sutter, Tuolumne, and Yuba counties. The cities of Live Oak Lodi, and Ripon continue in a drought emergency. Drought task forces have been established in Butte, Lake, Nevada, Placer, Plumas, Sacramento, San Joaquin, Stanislaus, Sutter, Tehama, Tuolumne, and Yolo counties to coordinate response to the drought.

Mandatory water reductions of 25 percent as ordered by Governor Brown continued to be in effect statewide, the first time such mandatory restrictions have been enacted.

Agriculture has been heavily impacted, with numerous farm and farm related jobs lost. The UC Davis Center for Watershed Sciences released a new report indicating that California’s ongoing drought will impact the state’s agricultural economy this year by an estimated $2.7 billion and eliminate more than 21,000 jobs. The state continued to supply food assistance to those impacted, along with California Disaster Assistance Act money for those who have lost drinking water due to dry wells. Approximately 743,642 boxes of food were distributed to 391,003 households in affected communities that suffered high levels of unemployment from the drought. Nonprofit organizations in the San Joaquin Valley were struggling to meet the needs of their clients for drought-related programs. One area crop which is being heavily impacted is rice production, which is expected to fall by about 30 percent due to water shortages.

Low runoff in streams and rivers on fish and ecological continues to cause adverse affects on forests and wildlife, including the endangered Delta Smelt and winter run Chinook Salmon. High temperatures in the Sacramento River are having a particularly strong effect on young salmon, and could repeat the major fish kill seen in the summer of 2014.

Air quality in the Valley has been poor throughout the drought, particularly in the San Joaquin Valley, due to the lack of rain to wash particles from the air and dust from unplanted fields and newly dug wells. Smoke from recent fires has worsened air quality significantly, causing problems even for healthy people. Asthma has become a much bigger problem in the Valley since the start of the drought.

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, 7:44 PM PST, 4 hours 16 minutes earlier.

Area forecast discussion, Aug 31, 7:44 PM PST, 4 hours 16 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
844 PM PDT MON AUG 31 2015

.SYNOPSIS...
September will start near normal but become cooler this week as a
weather system moves through. No moisture with this system, just
an increase to the winds in the delta and higher elevations across
Northern CA. For the Holiday weekend, dry conditions will continue
with temperatures warming back to near 90.

&&

.DISCUSSION...
Weak ridging over the area will be replaced by a broad trough
that will drop down along the coast from Canada Tuesday and
Wednesday. temperatures for Tuesday will be a little cooler than
today but near seasonal normals. The trough continues to deepen
over the area Wednesday and Thursday to bring cooler than normal
temperatures to the area...80s valley and 60s to lower 70s for the
mountains. This trough does not look like it will bring any
precipitation to most of the interior at this time with models
indicating some possible showers north of Shasta County. The
trough will likely generate breezy conditions Tuesday and
Wednesday as it deepens towards the area.

&&
.EXTENDED DISCUSSION (Friday THROUGH Monday)

Upper trough will dominate the weather on Friday with dry, cool
weather. Temperatures expected to be 5-10 degrees below normal
that afternoon. Valley highs will be in the mid 80s up to 90 while
highs across the mountains and foothills range in the 60s to low
80s. Over the weekend, the GFS and ECMWF models paint a different
outcome for the trough. The GFS has it weakening and lifting ENE
over the weekend. The ECMWF shows the low's center pushing
southward into NorCal on Saturday before lifting NE on Sunday
afternoon. Have trended more towards the GFS and have a gradual
warming trend over the weekend while maintaining dry weather. By
Sunday and Monday, daytime highs should be slightly above normal
with valley highs back in the 90s.  JBB

&&

.AVIATION...

VFR conditions tonight through tomorrow for the interior.

&&

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

Event by event

7 drought. Local standard time, as filed.

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
Newspaper

California ski resorts were offering incentives, such as discounts or guarantees to increase sales of season passes, which have been hurt in recent years by poor snow conditions. Dry conditions resulted in a continued loss of trees, numbering potentially in the millions, with heightened wildfire activity (see Butte Fire entry).

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
Newspaper

Agriculture continued to be impacted in September with some crops having a reduced harvest, bringing a significant loss of jobs. Rice production was forecast to drop by 30 percent in the Sacramento Valley. Tree mortality across the Valley increased, including even normally drought resistant oak trees. Golf courses faced pressure to use less water and were doing so, bringing a dry, brown appearance to the turf, and some remained shut down due to a lack of water. Many people reduced landscape watering at homes or removed grass lawns. Grass fires enhanced by the dry conditions were common. Wildlife such as the winter run Chinook Salmon in the Sacramento River suffered losses due to changes from the drought, such as an increase in water temperature.

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
Newspaper

Agriculture continued to be impacted in September with some crops having a reduced harvest, bringing a significant loss of jobs. Rice production was forecast to drop by 30 percent in the Sacramento Valley. Tree mortality across the Valley increased, including even normally drought resistant oak trees. Golf courses faced pressure to use less water and were doing so, bringing a dry, brown appearance to the turf, and some remained shut down due to a lack of water. Many people reduced landscape watering at homes or removed grass lawns. Grass fires enhanced by the dry conditions were common. Wildlife such as the winter run Chinook Salmon in the Sacramento River suffered losses due to changes from the drought, such as an increase in water temperature.

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
Newspaper

Agriculture continued to be impacted in September with some crops having a reduced harvest, bringing a significant loss of jobs. Rice production is forecast to drop by 30 percent in the Sacramento Valley. Tree mortality across the Valley increased, including even normally drought resistant oak trees. Golf courses faced pressure to use less water and were doing so, bringing a dry, brown appearance to the turf, and some remained shut down due to a lack of water. Many people reduced landscape watering at homes or removed grass lawns. Grass fires enhanced by the dry conditions were common. Wildlife such as the winter run Chinook Salmon in the Sacramento River suffered losses due to changes from the drought, such as an increase in water temperature.

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
Newspaper

Agriculture continued to be impacted in September during the harvest, with a significant loss of jobs. Rice production was forecast to drop by 30 percent in the Sacramento Valley. Bee keepers scaled back honey production due to a lack of nectar and honey to sustain their bees. Tree mortality across the Valley increased, including even normally drought resistant oak trees. Golf courses faced pressure to use less water and were doing so, bringing a dry, brown appearance to the turf, and some remained shut down due to a lack of water. Many people reduced landscape watering at homes or removed grass lawns. Grass fires enhanced by the dry conditions were common.

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
Newspaper

The drought continues to impact agriculture in the Delta. Wildlife such as the endangered Delta smelt and winter run Chinook Salmon are suffering losses due to changes from the drought, such as an increase in water temperature and salinity levels. Wildfire activity was enhanced.

Drought, Clear Lake/Southern Lake County

When
September 1, 12:00 AM PST to September 30, 11:59 PM PST
Where
Clear Lake/Southern Lake County forecast zone
Reported by
Newspaper

The drought continued to impact Lake County, with a reduced harvest yield reported. The harvest was very early, mainly completed by the end of September. Grape sizes were smaller than normal. Extremely dry conditions increased wildfire danger. The worst of these was the Valley Fire, which devastated multiple communities (see damage under wildfire entry).

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 2015Every state in 2015This day in weather historyWarnings in California, September 2015

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: 598036, 598037, 598038, 598039, 598040, 598041, 598042.