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PSA SIG GROUP CHARTS

erc chart

The Energy Release Component (ERC) is an NFDRS (National Fire Danger Rating System) index related to how hot a fire could burn. It is directly related to the 24-hour, potential worst case, total available energy (BTUs) per unit area (in square feet) within the flaming front at the head of a fire.

The ERC can serve as a good characterization of fire season as it tracks seasonal fire danger trends well. The ERC is a function of the fuel model and live and dead fuel moistures. Fuel loading, woody fuel moistures, and larger fuel moistures all have an influence on the ERC, while the lighter fuels have less influence and wind speed has none. ERC has low variability, and is the best fire danger component for indicating the effects of intermediate to long-term drying on fire behavior (if it is a significant factor) although it is not intended for use as a drought index.

Charts are from selected RAWS in each PSA and are arranged generally from the northern part of the Geographic Area to the southern part. The weather stations used represent the best fire danger conditions for that PSA. Most stations contain at least twenty years of historical weather data. Data collected prior to 1976 is not used in these analyses due to an issue with the relative humidity measurements before that time.

Winter conditions of snow covered fuels require that the ERC and fuel moisture graphs be temporarily discontinued. The graphs for this page are generated by FireFamily Plus. Weather station data imported into FireFamily Plus during the months of snow covered fuels does not contain all required information to generate accurate NFDRS outputs. This is due to missing Wet Fuels flag information in the imported FWX data and the FireFamily Plus program not being programmed to utilize the information imported using the FW9 format. Accurate values can be obtained from the Weather Information Management System (WIMS) - if the daily observation represents the snow covered fuels by properly “forcing” the Wet Fuels flag entry.

 

Updated Daily

   
YRSC
CHARTS

Eastern Sierra PSA SIG Group

Stations Used:

Crestview
Rock Creek

Model: Short Needle (Heavy Dead) (G)

Central Sierra PSA SIG Group

Stations Used:

Beaver
Mt. Elizabeth
Shaver

Model: Short Needle (Heavy Dead) (G)

Southern Sierra PSA SIG Group

Stations Used:

Black Rock
Cedar Grove
Johnsondale
Park Ridge
Sugarloaf

Model: Short Needle (Heavy Dead) (G)

Sierra Foothills PSA SIG Group

Stations Used:

Catheys Vly
Esperanza
Fancher Ck
Green Spr
Mariposa
Trimmer
Oak Opening
North Fork

Model: Short Needle (Heavy Dead) (G)

Central Valley PSA SIG Group

Stations Used:

Kettleman Hills
Fancher Ck

Model: Short Needle (Heavy Dead) (G)

Central Coast Interior PSA SIG Group

Stations Used:

Parkfield
Carrizo
Hernandez
La Panza
Carrizo

Model: Short Needle (Heavy Dead) (G)

Central Coast PSA SIG Group

Stations Used:

Los Prietos
Las Tablas
Arroyo Seco
Arroyo Grande

Model: Short Needle (Heavy Dead) (G)

South Coast PSA SIG Group

Stations Used:

Case Springs
Cheeseboro
Claremont
Malibu Hills
El Cariso
Saugus
Valley Center
Devore

Model: Short Needle (Heavy Dead) (G)

Western Mountains PSA SIG Group

Stations Used:

Chilao
Chuchupate
Ozena
Mill Creek (ANF)
Rose Valley
Warm Springs
Tanbark
Mormom Rock

Model: Short Needle (Heavy Dead) (G)

Eastern Mountains PSA SIG Group

Stations Used:

Converse
Big Pine Flat
Fawnskin

Model: Short Needle (Heavy Dead) (G)

Southern Mountains PSA SIG Group

Stations Used:

Alpine
Descanso
Julian
Keenwild
Mt. Laguna
Oak Grove

Model: Short Needle (Heavy Dead) (G)

Lower Deserts PSA SIG Group

Stations Used:

Squaw Lake

Model: Short Needle (Heavy Dead) (G)

Eastern Deserts PSA SIG Group

Stations Used:

Squaw Lake
Rice Valley

Model: Short Needle (Heavy Dead) (G)

Central Mojave PSA SIG Group

Stations Used:

Horse Thief Spring
Yucca Valley
Mojave River Sink

Model: Short Needle (Heavy Dead) (G)

Upper Deserts PSA SIG Group

Stations Used:

Acton
Poppy Park
Saddleback Butte

Model: Short Needle (Heavy Dead) (G)

Northern Deserts PSA SIG Group

Stations Used:

Benton
Panamint
Oak creek
Horse Thief Spring

Model: Short Needle (Heavy Dead) (G)

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