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Effective Tuesday, April 4, 2017, at 1000 AM Pacific StandardTime, 1100 AM Mountain Standard Time, 1800 Coordinated UniversalTime (UTC), the NWS WFO in Phoenix, Arizona (WFO PSR), willchange all public forecast zone names and boundaries. Uponimplementation of this change, all public forecasts and relatedproducts will use the zone numbers and names shown below. The zone changes will improve services by allowing more fine-tuned warnings and advisories for hazards such as dust, fog, andwinter weather and reflect changes in transportation andpopulation growth throughout the area. The new zone numbers and names are listed below: WFO Phoenix, Arizona, Public Weather Forecast Zones Zone Number Zone Name--------------- --------------------AZ530 Parker ValleyAZ531 KofaAZ532 YumaAZ533 Central La PazAZ534 Aguila ValleyAZ535 Southeast Yuma CountyAZ536 Gila River ValleyAZ537 Northwest ValleyAZ538 Tonopah DesertAZ539 Gila BendAZ540 Buckeye/AvondaleAZ541 Cave Creek/New RiverAZ542 Deer ValleyAZ543 Central PhoenixAZ544 North Phoenix/GlendaleAZ545 New River MesaAZ546 Scottsdale/Paradise ValleyAZ547 Rio Verde/Salt RiverAZ548 East ValleyAZ549 Fountain Hills/East MesaAZ550 South Mountain/AhwatukeeAZ551 Southeast Valley/Queen CreekAZ552 SuperiorAZ553 Northwest Pinal CountyAZ554 West Pinal CountyAZ555 Apache Junction/Gold CanyonAZ556 Tonto BasinAZ557 Mazatzal MountainsAZ558 Pinal/Superstition MountainsAZ559 Sonoran Desert Natl MonumentAZ560 San CarlosAZ561 Dripping SpringsAZ562 Globe/MiamiAZ563 Southeast Gila CountyCA560 Joshua Tree NP WestCA561 Joshua Tree NP EastCA562 Imperial County SouthwestCA563 Salton SeaCA564 Chuckwalla MountainsCA565 Imperial County SoutheastCA566 Imperial County WestCA567 Imperial ValleyCA568 Chiriaco SummitCA569 Palo Verde ValleyCA570 Chuckwalla Valley These zones will be replacing existing zones: Zone Number Zone Name--------------- --------------------AZ027 Southwest Maricopa CountyAZ023 Greater Phoenix AreaAZ022 Northwest Maricopa CountyAZ020 Lower Colorado River Valley AZAZ021 West Central DesertsAZ028 Northwest and North Central Pinal CountyAZ025 Yuma/Martinez Lake and VicinityCA032 Riverside County/Eastern DesertsCA033 Imperial CountyAZ024 Southern Gila/Tonto NF FoothillsAZ026 Southwest DesertsCA030 Joshua Tree National ParkCA031 Lower Colorado River Valley CA The zone changes are described at the following two links. Updated public zone shapefiles are online at: http://www.nws.noaa.gov/geodata/catalog/wsom/html/pubzone.htmA graphical depiction of this change is online at: http://www.wrh.noaa.gov/psr/general/zones/psr-zones04-17.html For more information, please contact: Ken WatersWarning Coordination Meteorologist