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000
NOUS41 KWBC 202011
PNSWSH

Service Change Notice 18-120 Updated
National Weather Service Headquarters Washington DC
415 PM EST Wed Feb 20 2019

To:   Subscribers:
   -NOAA Weather Wire Service
   -Emergency Manager Weather Information Network
-NOAAPORT
Other NWS partners and NWS employees

From:     Michelle Hawkins, Chief
   Severe, Fire, Public and Winter Weather Services
    Branch

Subject:   Updated: Change in Fire Weather Forecast Zones and
   Boundaries for WFO Morristown, TN and WFO Nashville,
   TN, Effective April 2, 2019

Updated to change implementation date to April 2, 2019 due to
the Government Lapse in Appropriations.

Effective 1400 (UTC) April 2, 2019, the NWS Weather Forecast
Offices in Morristown, TN, (MRX) and Nashville, TN, (OHX) will
change the current fire weather forecast zones to be identical
to the current public weather forecast zones.

Current fire weather forecast zones for WFO OHX in middle
Tennessee (TNZ400, TNZ501, TNZ502) will transition to county-
based zones. Current fire weather forecast zones for WFO MRX in
east Tennessee (TNZ150, TNZ200, TNZ300, TNZ301, TNZ302, TNZ303),
southwest Virginia (VAZ600) and southwest North Carolina
(NCZ300), will transition to county-based zones.

If April 2, 2019, is declared a Critical Weather Day, this
implementation will be postponed to April 4, 2019.

Transitioning to smaller county-based zones will provide a more
accurate and detailed forecast for the MRX and OHX fire weather
community. By moving to county-based zones both WFOs will have
the ability to adjust zone groupings dependent upon expected
weather conditions. MRX will keep the split counties in east
Tennessee for mountain fire weather zones.

Additionally, due to forecast familiarity and associated
forecast accuracy, WFO OHX will take over fire weather
responsibility from WFO MRX for Coffee, Grundy, Van Buren and
Franklin counties in south central Tennessee.

The following section details the breakup of the current Fire
Weather Zones into the new county-based zones and transfer of
fire weather responsibility.

Tennessee Fire Weather Zone 150, East Tennessee District - East,
will be broken up into the following new Zone Numbers and new
Zone Names:
New Zone Number  New Zone Name  WFO

TNZ015 Hancock  MRX
TNZ016 Hawkins  MRX
TNZ017 Sullivan  MRX
TNZ038 Grainger  MRX
TNZ039 Hamblen  MRX
TNZ040 Northwest Cocke  MRX
TNZ042 Northwest Greene  MRX
TNZ044 Washington  MRX
TNZ046 Northwest Carter  MRX

Tennessee Fire Weather Zone 200, East Tennessee District - West,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name   WFO

TNZ012 Scott  MRX
TNZ013 Campbell  MRX
TNZ014 Claiborne  MRX
TNZ035 Morgan   MRX
TNZ036 Anderson  MRX
TNZ037 Union  MRX
TNZ067 Roane  MRX
TNZ068 Loudon   MRX
TNZ069 Knox  MRX
TNZ070 Jefferson  MRX
TNZ071 Northwest Blount  MRX
TNZ073 North Sevier  MRX
TNZ086 Northwest Monroe  MRX

Tennessee Fire Weather Zone 300, Cumberland District - South,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name  WFO

TNZ081 Sequatchie  MRX+
TNZ083 Rhea  MRX
TNZ084 Meigs  MRX
TNZ085 McMinn   MRX
TNZ098 Marion   MRX
TNZ099 Hamilton  MRX
TNZ100 Bradley  MRX
TNZ077 Coffee   OHX
TNZ079 Grundy   OHX
TNZ080 Van Buren  OHX-
TNZ097 Franklin  OHX

Tennessee Fire Weather Zone 301, Northern Cherokee National
Forest, will be broken up into the following new Zone Numbers
and new Zone Names:
New Zone Number  New Zone Name  WFO

TNZ018 Johnson  MRX
TNZ041 Cocke Smoky Mountains  MRX
TNZ043 Southeast Greene  MRX
TNZ045 Unicoi   MRX
TNZ047 Southeast Carter  MRX

Tennessee Fire Weather Zone 302, Southern Cherokee National
Forest, will be broken up into the following new Zone Numbers
and new Zone Names:

New Zone Number  New Zone Name  WFO

TNZ087 Southeast Monroe  MRX
TNZ101 West Polk  MRX
TNZ102 East Polk  MRX

Tennessee Fire Weather Zone 303, TN portion of the Great Smoky
Mountains National Park, will be broken up into the following
new Zone Numbers and new Zone Names:

New Zone Number  New Zone Name  WFO

TNZ072 Blount Smoky Mountains   MRX
TNZ074 Sevier Smoky Mountains   MRX

Tennessee Fire Weather Zone 400, Cumberland District - North,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name  WFO

TNZ009 Macon  OHX
TNZ010 Clay  OHX
TNZ011 Pickett  OHX
TNZ029 Trousdale  OHX
TNZ030 Smith  OHX
TNZ031 Jackson  OHX
TNZ032 Putnam   OHX
TNZ033 Overton  OHX
TNZ034 Fentress  OHX
TNZ063 Cannon   OHX
TNZ064 De Kalb  OHX
TNZ065 White  OHX
TNZ066 Cumberland  OHX
TNZ078 Warren   OHX

Tennessee Fire Weather Zone 501, Highland Rim District - North,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name   WFO

TNZ005 Stewart  OHX
TNZ006 Montgomery  OHX
TNZ007 Robertson      OHX
TNZ008 Sumner   OHX
TNZ023 Houston  OHX
TNZ024 Humphreys  OHX
TNZ025 Dickson  OHX
TNZ026 Cheatham     OHX
TNZ027 Davidson  OHX
TNZ028 Wilson   OHX
TNZ059 Williamson  OHX
TNZ062 Rutherford  OHX

Tennessee Fire Weather Zone 502, Highland Rim District - South,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name   WFO

TNZ056 Perry  OHX
TNZ057 Hickman  OHX
TNZ058 Lewis  OHX
TNZ060 Maury  OHX
TNZ061 Marshall  OHX
TNZ075 Bedford  OHX
TNZ076 Moore  OHX
TNZ092 Hardin   OHX
TNZ093 Wayne  OHX
TNZ094 Lawrence  OHX
TNZ095 Giles  OHX
TNZ096 Lincoln  OHX

North Carolina Fire Weather Zone 300, Nantahala National Forest,
will be broken up into the following new Zone Numbers and new
Zone Names:

New Zone Number  New Zone Name  WFO

NCZ060 Cherokee  MRX
NCZ061 Clay  MRX

Virginia Fire Weather Zone 600, Jefferson National
forest/Virginia Forestry District 6, will be broken up into the
following new Zone Numbers and new Zone Names:

New Zone Number  New Zone Name       WFO

VAZ001 Lee       MRX
VAZ002 Wise       MRX
VAZ002 Wise (City of Norton)       MRX
VAZ005 Scott       MRX
VAZ006 Russell       MRX
VAZ008 Washington       MRX
VAZ008 Washington (City of Bristol)  MRX

Once again, Coffee (TNZ077), Grundy (TNZ079), Van Buren
(TNZ080), and Franklin (TNZ097) will transfer from MRX to OHX.
Graphical descriptions of the old and new fire weather forecast
zones are online at:

http://www.weather.gov/mrx/firezonechange-2019
and
http://www.weather.gov/ohx/firezonechange-2019

NWS watch, warning and forecast products affected by these
changes are:

PRODUCT    WMO HEADING       AWIPS ID

Fire Weather Watch  WWUS84 KMRX      RFWMRX
Red Flag Warning   WWUS84 KMRX       RFWMRX
Fire Weather Planning Forecast   FNUS54 KMRX       FWFMRX
Fire Weather Watch   WWUS84 KOHX       RFWOHX
Red Flag Warning   WWUS84 KOHX       RFWOHX
Fire Weather Planning Forecast   FNUS54 KOHX       FWFOHX

NWS partners and users will need to make necessary changes to
their communications systems to accommodate these fire weather
forecast zone changes.

A shapefile of the new fire weather forecast zones for WFO OHX
and MRX is online at:

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

For more information, please contact:
Sam Roberts
Fire Weather Program Leader
NWS Morristown, TN 37814
423-586-3771
sam.roberts@noaa.gov
  or
John Cohen
Fire Weather Program Leader
NWS Nashville, TN 37138
615-754-8500
john.cohen@noaa.gov

National Service Change Notices are posted at:

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


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