Emergency Management Radio Systems Comprehensive Emergency Management Network (CEMNET)

The Emergency Management Division (EMD) operates a statewide, very high frequency (VHF) low-band radio system, as the primary backup communication link between the state EOC and local EOC's throughout the state. It also serves as a link to other agencies such as the state departments of Ecology and Health, the UW Seismology Lab, and Harborview Medical Center.

The following map depicts the location of the twelve mountaintop base stations that comprise the backbone of the network. The CEMNET base stations are controlled from the state EOC through the Washington State Patrol microwave system.

CEMNET operates primarily on three (3) frequencies, designated for accountability purposes as F1- 45.200 MHz, F2 - 45.360 MHz, and F3- 45.480 MHz. In radios set up primarily for CEMNET use, this will usually correspond to channels 1, 2, and 3.

The State Emergency Operations Officer (SEOO) located within the State EOC monitors the network on a 24-hour basis. For operational purposes, the state has been divided into five regions (see table below), with a channel designated for use within that region. The State Emergency Operations Officer (SEOO) will monitor the designated channel (frequency) for both routine and emergency traffic and respond accordingly. Should traffic build-up cause a problem within the network, the State EOC will act as Net Control.

CEMNET is tested weekly with local emergency management jurisdictions on the following schedule:

  • Western Washington stations: Tuesday, 0900 hours
  • Central Washington stations: Wednesday, 0900 hours
  • Eastern Washington stations: Thursday, 0900 hours

Local emergency management jurisdictions are authorized to use the designated CEMNET region channel for local operations.

Northwest Southwest Central Northeast Southeast
F1 (45,20 MHz) F2 (45.36 MHz) F3 (45.48 MHz) F1 (45.20 MHz) F2 (45.36 MHz)
Clallam Clark Adams Ferry Asotin
Island Cowlitz Benton Lincoln Columbia
Jefferson Grays Harbor Chelan Okanogan Garfield
King Lewis Douglas Pend Oreille Whitman
Kitsap Mason Grant Spokane
San Juan Pacific Franklin Stevens
Skagit Pierce Kittitas
Snohomish Skamania Klickitat
Whatcom Thurston Yakima
Bellevue Wahkiakum Walla Walla
Kent Tacoma
SW Snohomish Lacey
Seattle Shelton
Auburn Puyallup
Kirkland
Snoqualmie
Port Angeles
Redmond

Local jurisdictions should use the region channel assignment as identified in the preceding table for local "base station" to mobile / portable communications in support of local day-to-day and emergency needs. Each local jurisdiction is authorized at least five (5) mobiles per license.

Additionally, MAST helicopters from Fort Lewis and/or Army National Guard may communicate on Channel F1 on their FM systems.

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