National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

NOAA / NWS News and Local CNRFC Information

Late December 2022-January 2023 and Late February-March 2023 Storm Summaries - The CNRFC has published two in-depth storm summaries documenting the historic period of storms affecting the region during the 2023 Water Year. The studies include a summary of winter conditions between December 2022 and March 2023, an analysis of observed precipitation data, a discussion of weather conditions and resulting hydrologic impacts, and a deep dive into precipitation verification. To view "Section 1: Late December 2022 and January 2023", visit the link here, and to view "Section 2: Late February and March 2023", visit the link here.

CNRFC ArcGIS StoryMap: 2023 Water Year Summary - The CNRFC has published an ArcGIS StoryMap reviewing the historic 2023 Water Year. This document provides a summary of the antecedent conditions, the series of winter storms to affect the region, the resulting impacts of these storms, and the prolonged spring and summer snowmelt period. To access this ArcGIS StoryMap, please visit the link here. Also, we will soon be publishing a two part "Storm Summary" for the active weather pattern from late December 2022 through March 2023 that details the overall weather pattern, resulting precipitation and hydrology, and a discussion of verification.

CNRFC Daily Briefing - View a graphical summary of current & forecast weather & hydrologic conditions. Updated by 10 AM PT.

Alert MessageAt Least One River Guidance (Flood Forecast) Point Is Currently or Forecast to Exceed Monitor StageAlert Message

 
Recently-Issued CNRFC Text Products:  
 

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Geographic
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    2023    2022    2021
 

Topography

Topography/USGS

ESRI Topography

Shaded Relief

Imagery

Nat'l Geographic

Topo/Rivers

Topo/Hydro

Light Gray
 
The number inside each circle above represents the number of gages with observed conditions inside that category.
The number inside each circle above represents the number of gages with forecast conditions inside that category.
The number inside each circle above/below represents the number of gages with conditions inside that category.
Forecast
(large dots)
The number inside each circle above represents the number of gages with observed conditions inside that category.
The number inside each circle above represents the number of gages with forecast conditions inside that category.
The number inside each circle above/below represents the number of gages with conditions inside that category.
Observed
(small dots)



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Rivers/Reservoirs

Deterministic 5-Day Forecasts 

Data updated:

Ensemble Forecasts
Data updated:


Peak Exceedance Probabilities*
Data updated:
10%25%50%75%90%
5-Day Peak
10-Day Peak
*Exceedance probabilities are only available for selected forecast points.

Observed Data
Data updated:

Latest Hour 1 Hr Ago 2 Hrs Ago 3 Hrs Ago
Forecast Points
Other Points
Reservoirs

Deterministic Forecast + Observed Data
Fcst data updated:
Obs data updated:
Forecast Points 
Link to





Significant River Flood Outlook
Data updated:
Valid:

      National Significant River Flood Outlook

Water Resources

Data updated (unless otherwise noted):


 

 








Monthly Archive
Month/Year:     

Reservoir Storage
(Data to 1925 for all reservoirs/1951 for "major")
% Normal % Capacity

Snow Data

National Gridded Data



Select date:     To:

Point Data
Data updated:
SWE
SWE Change



Data updated:
Snow Depth
Snow Depth Change

Daily Archive (Data back to Apr 2014)
M/D/Y:     
  Basin Elevation Zones % Avg % Apr 1
Avg
Value
Simulated
Basin
Avg
Middle/Upper
Lower/Only
All Zones

Monthly Archive (Data back to Jan 1998)
Month/Year:     
  % Avg Value
Point*
* Jan-Jun only prior to 2019.

Observed Precipitation (QPE)

Radar Data
 
 


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Short-Range Point Data

Raw data updated:
QC data updated:   
Most Recent Hours (Raw):












6-Hour Totals (QC'd = Quality-Controlled)
Ending 18Z (10 AM PST) Ending 00Z (4 PM PST) Ending 06Z (10 PM PST) Ending 12Z (4 AM PST)
 
 
 
 
24-Hour Totals (QC'd = Quality-Controlled)



Short-Range Gridded Data
Images created:






     

Monthly/Water Year Archive (starts Oct 1996)
Month/Year:     
Note: The water year starts on October 1 of the previous reference year and ends on September 30 of the reference year. For example, the 2020 Water Year began on October 1, 2019 and ended on September 30, 2020.
    % Avg Value Departure Avg
Point Month
   
WY
   
Grid Month
WY
Basin
Avg
Month
     
WY
     
Forecast
Group
WY
     


 From Water Year:   to: 

Forecast Precipitation (QPF)

CNRFC Forecast Data
Forecast issued:
 
 

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WPC Forecast Data
Day 1 issued:
Day 2 issued:
Day 3 issued:
Days 1-3 issued:
Days 1-7 issued:
WPC 6-Hourly QPF
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WPC 24-Hourly QPF
Select forecast time:  


WPC 72-Hourly QPF

WPC 7-Day QPF

Observed Temperatures

Point Data
Data updated:
QC data updated:
Instantaneous Temperatures
Temp Change:
Max/Min Temperatures
24-Hour Max
Ending 12Z
(4 AM PST)
24-Hour Min
Ending 12Z
(4 AM PST)
Daytime
Max *
Overnight
Min **
* Updated: 9 PM   **Updated: 9 AM  

Gridded Data
Images created:
 
 

Select obs time:  











Forecast Temperatures

Basin Temperature Plots
Images created:


Forecast Temperature Grids
Images created:




  








  




Freezing Levels

Observed Freezing Levels
Images created:
  

Select forecast time:  


Forecast Freezing Levels
Forecast issued:
  

Select forecast time:  


Flash Flood Guidance/Debris Flow

Flash Flood Guidance Grids
Images created:



Note: Recent burn areas are typically more vulnerable to flash flooding and debris flows. Check with your local NWS Forecast Office for fire specific guidance.

Post-Wildfire Debris-Flow Basin Probability
Debris Flow Probability (peak 15-min rainfall intensity of 24 mm/hr)

More info: USGS post-wildfire debris-flow hazards

Water Temperatures

Data updated:






Climate/Drought

U.S. Drought Monitor

Select issuance date range:

From:     To:

Climate Prediction Center Outlooks
Drought Outlooks
Extended Range Outlooks
Precipitation
Temperatures
Long Lead Outlook
Precipitation
Temperatures

QPF Verification

24-Hour QPF Verification Grids
Images created:
Date: (ending 4am PST / 5am PDT) Select forecast to verify:
Day 1 forecast created Fri Mar 1, 2024


    QPE    
QPF

Watches/Warnings/Advisories

Last updated:
 

Mid-Atlantic RFCOhio RFCNortheast RFCNorth-Central RFCMissouri Basin RFCLower Mississippi RFCWest Gulf RFCArkansas-Red Basin RFCSoutheast RFCNorthwest RFCColorado Basin RFCCalifornia-Nevada RFCAlaska-Pacific RFCMap showing all 13 RFCs
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River Guidance Points Forecast Above Specified Stage Definitions  (Select NWS ID for Specified Graphical RVF)
NWS IDRiver / CreekGage / StationMonitor
Stage
Flood
Stage
Danger
Stage
Latest Observed
Stage / Flow
Latest Observed
Date / Time
Max Forecast
Stage / Flow
Forecast
Status
CLAC1SACRAMENTO COLUSA WEIR 60.970.171.162.96  /  1,77103/02 06:00 AM PST63.2  /  2,520Above Monitor
TISC1SACRAMENTO TISDALE WEIR 44.151.652.646.67  /  11,97503/02 05:15 AM PST46.7  /  12,045Above Monitor
FMWC1SACRAMENTO FREMONT WEIR 32.039.540.533.50  /  82,51503/02 06:15 AM PST33.4  /  80,031Above Monitor
RVBC1SACRAMENTO RIO VISTA 7.411.912.97.6  /  NA03/02 05:45 AM PST7.4  /  NAAbove Monitor
LSBC1YOLO BYPASS LISBON 13.019.026.216.0  /  NA03/02 06:15 AM PST16.0  /  NAAbove Monitor
CLKC1CLEAR LAKE LAKEPORT 8.09.08.04  /  335,96403/02 05:15 AM PST8.5  /  357,719Above Monitor
MHBC1COSUMNES MICHIGAN BAR 7.012.08.77  /  8,76703/02 05:30 AM PST7.7  /  5,470Above Monitor
MCNC1COSUMNES MCCONNELL 38.544.539.4  /  NA03/02 06:15 AM PST38.9  /  NAAbove Monitor

** NOTE **  Stage is presented in "Feet" while Flow (Storage at CLKC1) is presented in "cfs" ("Acre-Feet").

River Guidance Forecast Group Issuance and Next Update Times  (Select Forecast Group for Specified Text RVF)
FG IDForecast GroupIssuance TimeNext Update Time
SENorth Coast[ Alternate Link ]CSVMar 01 2024 at 2:19 PM PSTMar 02 2024 at 9:00 AM PST
RNRussian Napa[ Alternate Link ]CSVMar 01 2024 at 8:53 PM PSTMar 02 2024 at 9:00 AM PST
USAUpper Sacramento[ Alternate Link ]CSVMar 01 2024 at 7:55 PM PSTMar 02 2024 at 9:00 AM PST
LSCLower Sacramento[ Alternate Link ]CSVMar 01 2024 at 2:02 PM PSTMar 02 2024 at 9:00 AM PST
SJSan Joaquin[ Alternate Link ]CSVMar 01 2024 at 8:25 PM PSTMar 02 2024 at 9:00 AM PST
CCCentral Coast[ Alternate Link ]CSVMar 01 2024 at 2:20 PM PSTMar 02 2024 at 9:00 AM PST
SCASouthern California[ Alternate Link ]CSVMar 01 2024 at 2:20 PM PSTMar 02 2024 at 9:00 AM PST
ESEastern Sierra[ Alternate Link ]CSVMar 01 2024 at 2:21 PM PSTMar 02 2024 at 9:00 AM PST
HBTHumboldt[ Alternate Link ]CSVMar 01 2024 at 2:22 PM PSTMar 02 2024 at 9:00 AM PST
SAC Sacramento Delta (Tides) [ Alternate Link ] Mar 02 2024 at 6:09 AM PSTMar 03 2024 at 9:00 AM PST
 
** NOTE 1 **  The Klamath and North Coast river guidance points are included in the North Coast Forecast Group.
** NOTE 2 **  The Feather Yuba, American, and Cache Putah river guidance points are included in the Lower Sacramento River Forecast Group.
** NOTE 3 **  The Delta Region, Upper and Lower San Joaquin, and Tulare river guidance points are combined in the San Joaquin River Forecast Group.
** NOTE 4 **  The Salinas Pajaro and South Bay river guidance points are included in the Central Coast Forecast Group.
** NOTE 5 **  The Southern California and San Diego/Inland river guidance points are included in the Southern California Forecast Group.

CNRFC Daily Briefing
Observed Precipitation Graphical Discussion Forecast Precipitation
** Note ** Click on Indvidual Images to Expand.