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PNSWSH



Service Change Notice 25-93 Updated

National Weather Service Headquarters Silver Spring MD

1110 AM EST Tue Feb 3 2026



To:	 Subscribers:

	 -NOAA Weather Wire Service

	 -Emergency Managers Weather Information Network

	 -NOAAPORT

	 Other NWS Partners, Users and Employees



From:	 Mary Mullusky, Chief

	 Operations Services Division



Subject: Updated: Changes to Fire Forecast Zones for WFO Eureka,

CA effective March 3, 2026



Updated to correct Fire Weather zone names in Table 2 for zones

405, 407, and 408.



Effective Tue, March 3, 2026, at 1:00 PM Pacific Standard Time

(ST), 2100 Coordinated Universal Time (UTC), the NWS Weather

Forecast Office in Eureka, CA (EKA) will change Fire Weather

Forecast Zones encompassing Del Norte, Humboldt, Trinity,

Mendocino, and Lake Counties in northwestern California. After

this change, all forecasts and related products will use the

zone numbers and names shown in Table 2 below.



If March 3, 2026 is declared a Critical Weather Day, this

implementation will be postponed to March 4, 2026 at 2100 UTC.



These changes will result in more geographically precise

forecast, watch and warning products for the general public and

will enhance web-based graphical product consistency and

appearance.



Ten current zones will be converted into 21 separate zones.

These new zones are being divided to optimize issuance of hazard

products for conditions that vary significantly in the rugged

terrain of northwestern California.  The new zones are listed in

Table 2.



Table 1. Universal Geographic Codes (UGC): Current Fire Forecast

Zone Name

----------------------------------

CAZ201: North Coast

CAZ202: Coastal Mendocino

CAZ203: Upper Smith

CAZ204: Lower Middle Klamath

CAZ211: Hoopa

CAZ212: Van Duzen/Mad River

CAZ264: Lake County Portion of Lake/Napa/Sonoma RU

CAZ276: Interior Mendocino

CAZ277: W Mendocino NF/E Mendocino Unit

CAZ283: Trinity



Table 2. UGC: New Fire Forecast Zone Name

-------------------------------

CAZ401: Coastal Del Norte

CAZ402: Interior Del Norte Including the Smith River Valley

CAZ403: Northeastern Interior Humboldt and Southwestern Siskiyou

	Including Orleans

CAZ404: Northern Coastal Humboldt

CAZ405: Northwestern Interior Humboldt Including the Bald Hills

CAZ406: Eastern Interior Humboldt Including Willow Creek and

	Hoopa

CAZ407: Southwestern Humboldt Including the King Range and the

	Eel River Valley

CAZ408: Southeastern Interior Humboldt Including Kneeland and

	Alderpoint

CAZ409: Northwestern Trinity Including Salyer and Big Bar

CAZ410: Northeastern Trinity Including Trinity Lake

CAZ411: Eastern Trinity Including Weaverville and Hayfork

CAZ412: Southern Trinity Including Ruth Lake and the Yolla

	Bollys

CAZ413: Coastal Mendocino

CAZ414: Northern Interior Mendocino Including Leggett and

	Willits

CAZ415: Northeastern Interior Mendocino Including Covelo

CAZ416: Southeastern Interior Mendocino Including Ukiah and

	Potter Valley

CAZ417: Southwestern Interior Mendocino Including Booneville

CAZ418: Northern Lake Including Gravelly Valley

CAZ419: Eastern Lake Including Clearlake and Middletown

CAZ420: Southern Lake Including Cobb and Konocti

CAZ421: Western Lake Including Lakeport



Table 3. NWS products affected by the WFO Eureka, CA,

by these Fire Weather forecast zone changes are listed below.



Product Name			   WMO Heading	  AWIPS ID

-------------			   -----------	  --------

Fire Weather Forecast		   FNUS56 KEKA	  FWFEKA

Red Flag Warning		   WWUS86 KEKA	  RFWEKA

Fire Warning			   WOUS46 KEKA	  FRWEKA



NWS partners and users will need to make necessary changes to

their communications systems to accommodate these weather

forecast zone changes.



Preliminary shapefiles for fire weather forecast zones are

available online at:



https://www.weather.gov/gis/FireZones



Final versions of these shapefiles will be available on February

13, 2026.



A graphical depiction of this change is online at:



https://www.weather.gov/eka/2026_Fire_Zone_Change



For more information, please contact:



Ryan Aylward

Warning Coordination Meteorologist

NWS Eureka, CA

ryan.aylward@noaa.gov



or

James White

Fire Weather Team Lead

NWS Eureka, CA

james.h.white@noaa.gov



National Service Change Notices are online at:



https://www.weather.gov/notification/