California, 2015

Drought in California, December 1 to 27, 2015

December 1 to 27, 2015 · NWS STO · 5 events in 5 counties and zones

The long term drought continued through December, though there was near normal precipitation in the mountains and above normal snow pack by the end of the month. Reservoirs across the area began to slowly fill but continued to be well below normal levels.

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
5

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 December, though there was near normal precipitation in the mountains and above normal snow pack by the end of the month. Reservoirs across the area began to slowly fill but continued to be well below normal levels.

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.

Governor Jerry Brown declared a drought emergency for the entire state of California January 17, 2014 and this continued to be in effect. He extended the executive order requiring Californians to continue conserving water through October 2016.

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 state continued to supply food assistance to those impacted by the drought, along with California Disaster Assistance Act money for those who have lost drinking water due to dry wells. Nonprofit organizations in the San Joaquin Valley struggled to meet the needs of their clients for drought-related programs.

Drought stressed and killed many trees in California’s forests, with as much as 20 percent of the state’s forests, or about 120 million trees, potentially dying from drought stress.

Low runoff in streams and rivers continued to cause adverse affects on fish and other wildlife, though there was some improvement in flows from rain events through the month of December. The endangered Delta Smelt and winter run Chinook Salmon were heavily impacted late in the year. The Chinook Salmon lost an estimate 95 percent of hatchlings on the Sacramento River due to the effects of the drought, and may be in danger of extinction. This is also impacting the California salmon fishing industry, which produces an estimated $1.4 billion annually.

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 Nov 30, 9:22 PM PST, 2 hours 38 minutes earlier.

Area forecast discussion, Nov 30, 9:22 PM PST, 2 hours 38 minutes before
Area Forecast Discussion
National Weather Service Sacramento CA
922 PM PST MON NOV 30 2015

.SYNOPSIS...
A FEW SHOWERS ARE POSSIBLE THROUGH WEDNESDAY OVER SHASTA COUNTY.
THE NEXT STORM SYSTEM ARRIVES THURSDAY AFTERNOON WITH WET AND
WINDY WEATHER. SNOW WILL BE LIKELY OVER THE MOUNTAINS THURSDAY
EVENING WITH POSSIBLE TRAVEL DELAYS.

&&

.DISCUSSION...
A weak system passed through the region earlier and brought some
light showers to the interior. That system is now east of the area
and in Nevada. Winds are becoming light but we will have some
cloud cover that will help to keep temperatures a little warmer
than the past several nights. Temperatures should still cool off
to the lower to mid 30s by morning.

Weak ridging over the interior during the day will keep things dry
ahead of a shortwave near 40N and 130W. That system will bring a
chance of some light precipitation to from the Central Sacramento
valley northward Tuesday night into Wednesday evening. Snow levels
over the north may be on the low side initially around 3500 feet
but should rise Tuesday night and Wednesday eventually up to near
7000 feet.

The next decent system will arrive on Thursday and should bring
some decent amount of snow to the higher elevations and windy
conditions. In the valley .25 to .50 of an inch of rain looks
like a fairly good estimate at this time but we will have to keep
a watch on the system in case it enhances a little before landfall.
Winds will increase on Thursday as the system moves through with
sustained winds 20 to 35 mph possible and gusts up to 45 mph. The
strongest winds will occur from mid to late morning through most
of the afternoon hours before subsiding.

&&
.EXTENDED DISCUSSION (Friday THROUGH Monday)

Pacific frontal system moves through Thursday into Friday then
models showing increasing subsidence over Interior NorCal late
Friday into Saturday as upper ridge moves inland. Models differ
Sunday into early next week with track and depth of short wave
troughs. Although confidence low during this time frame, forecast
leans towards the EC/GEM solutions with a deeper system moving
through Sunday followed by another wave Monday.

&&

.AVIATION...

Mainly VFR conditions with NW winds up to 12 kts through Tuesday.
Patchy fog may form in the Valley from Sacramento southward
between 12-16z Tuesday.

Dang

&&

.STO Watches/Warnings/Advisories...
None.
&&

Event by event

5 drought. Local standard time, as filed.

Drought, Northern Sacramento Valley

When
December 1, 12:00 AM PST to December 27, 11:59 PM PST
Where
Northern Sacramento Valley forecast zone
Reported by
Drought Monitor

The Household Water Supply Shortage Reporting System indicated there were some homes without well water due to dry wells, with 2 in Shasta County, 34 at Tehama County. Wildlife such as the winter-run Chinook Salmon in the Sacramento River suffered catastrophic losses, with the National Marine Fisheries Service reporting in October that 95 percent of the winter-run Chinook eggs, hatchlings and juvenile salmon died this year in the Sacramento River due to changes from the drought, such as an increase in water temperature.

Drought, Central Sacramento Valley

When
December 1, 12:00 AM PST to December 27, 11:59 PM PST
Where
Central Sacramento Valley forecast zone
Reported by
Drought Monitor

The Household Water Supply Shortage Reporting System indicated there were some homes without well water due to dry wells, with 70 in Butte County, 28 in Glenn County, and 8 in Colusa County. Wildlife such as the winter-run Chinook Salmon in the Sacramento River suffered catastrophic losses, with the National Marine Fisheries Service reporting in October that 95 percent of the winter-run Chinook eggs, hatchlings and juvenile salmon died this year in the Sacramento River due to changes from the drought, such as an increase in water temperature.

Drought, Northern San Joaquin Valley

When
December 1, 12:00 AM PST to December 27, 11:59 PM PST
Where
Northern San Joaquin Valley forecast zone
Reported by
Drought Monitor

The Household Water Supply Shortage Reporting System indicated there were some homes without well water due to dry wells, with 82 in Stanislaus County, and 22 in San Joaquin County.

Drought, Southern Sacramento Valley

When
December 1, 12:00 AM PST to December 27, 11:59 PM PST
Where
Southern Sacramento Valley forecast zone
Reported by
Drought Monitor

The Household Water Supply Shortage Reporting System indicated there were some homes without well water due to dry wells, with 8 in Yolo County, 1 in Sacramento County. Wildlife such as the winter-run Chinook Salmon in the Sacramento River suffered catastrophic losses, with the National Marine Fisheries Service reporting in October that 95 percent of the winter-run Chinook eggs, hatchlings and juvenile salmon died this year in the Sacramento River due to changes from the drought, such as an increase in water temperature.

Drought, Carquinez Strait and Delta

When
December 1, 12:00 AM PST to December 27, 11:59 PM PST
Where
Carquinez Strait and Delta forecast zone
Reported by
Drought Monitor

The Household Water Supply Shortage Reporting System had 2 homes without well water in Solano County. Wildlife such as the winter-run Chinook Salmon in the Sacramento River suffered catastrophic losses, with the National Marine Fisheries Service reporting in October that 95 percent of the winter-run Chinook eggs, hatchlings and juvenile salmon died late in the year in the Sacramento River due to changes from the drought, such as an increase in water temperature. Waterfowl in the Delta were significantly impacted by decreased wetlands habitat.

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, December 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: 605770, 605771, 605772, 605773, 605774.