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Home , Dust storm warning, Excessive heat warning, Excessive heat watch, Flash flood watch, Freeze warning, Freeze watch

Warning Flood (FLWPSR) (NPWPSR) Heat Advisory Flood Advisory (FLSPSR) Advisory Flood Excessive Blowing Dust Advisory Advisory Blowing Dust Blowing Dust WarningBlowing Dust Heat Watch Excessive Severe Severe Public ProductPublic WarningStorm Dust Flash Warning Flood Statement (SPSPSR) Statement High Wind Warning Flash Watch (SVRPSR) WarningTornado Special Weather Dust Advisory Dust (NPWPSR) (NPWPSR) (NPWPSR) (NPWPSR) (NPWPSR) (NPWPSR) (DSWPSR) (FFWPSR) (TORPSR) (FFAPSR) Thunderstorm producing wind gusts of at least 50 knots (58 mph) and/or hail size of one inch hail (U.S.and/or one larger sizequarter-size) mph) of or (58 diameter knots Thunderstorm producing50 least windat gustsof Elevated stream flow or ponding of water occurs within six hours of heavy rainfall;nuisance-typenot routineor flooding heavy does within that hours of ponding occurs six or water flow of stream Elevated Gradual rise in water that is expected to threaten life and/or property (typically for 6+ hours); also issued for river forecast points forecast river issued for also hours); 6+ for (typically property threatenlifeand/or Gradual to is expected thatin rise water Normally issued 6-48 hours in advance of when hydrometeorological conditions capable of producing capable conditions of flash flooding whenhydrometeorological possible isor in hours of advance issuedNormally 6-48 Zones 557 (MazatalZones Mountains, 557 (Pinal/Superstition Mountains),558 and (Southeast 563 County): Gila "High" High" significant(dangerous) "Very (deadly)of or risk heat-related illnessand imminent areoccurring healthimpacts or

Note: Sustained wind speeds of 40 mph or greater and/or any non-convective wind gusts of 58 mph or greater are occurring or greaterareoccurring or or mph wind 58 gustsof anynon-convective greaterand/or Sustained or mph wind 40 speeds of Normally issued 2-7 days in advance of when a "high" or "very high" risk of heat-related illness is expected following the following high" heat-relatedillnessis expected risk of whena"high" "very days inadvanceof or issuedNormally 2-7 Note: These zone-based advisories are for widespread, long-duration events typically lasting for 90 minutes or more. or minutes 90 for lasting typically events long-duration forwidespread, are advisories zone-based Note: These Note: These polygon-based advisories are for localized, short-duration events typically lasting for 90 minutes or less. or minutes 90 for lasting typically events short-duration forlocalized, are advisories polygon-based Note: These Note: These zone-based warnings are for widespread, long-duration events typically lasting for 90 minutes or more. more. or minutes 90 for lasting typically events long-duration are forwidespread, warnings zone-based Note: These Note: These polygon-based warnings are for localized, short-duration events typically lasting for 90 minutes or less. or minutes 90 for lasting typically events short-duration are forlocalized, warnings polygon-based Note: These Rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a above creek or instream rise a arapid level area, or water dry normally high a into of water Rapidflow and extreme NWS Phoenix (PSR)Warning,Watch, NWS and Criteria Advisory Widespread blowing dust reducing visibilities to 1 mile or less, but greater than 1/4 mile, is occurring or imminent. is occurring imminent. mile, or Widespreadbut less, greater than blowingor 1/4 dustreducing mile 1 visibilitiesto

Localized blowing dust reducing visibilities to 1 mile or less, but greater than 1/4 mile, is occurring imminent. mile, or but less,greater than blowingLocalized or 1/4 dustreducing mile 1 visibilitiesto "HeatRisk" considers how much above normal high and low temperatures are (using a 1985-2014 climatology), the the climatology), 1985-2014 a temperatures(using are low and high normal above much how "HeatRisk" considers predetermined flood level within six hours of heavy rainfall or a dam/levee failure is occurring imminent. rainfall or adam/levee heavy or withinhours of six level predetermined flood based on the "HeatRisk" forecast product (shown at https://www.wrh.noaa.gov/wrh/heatrisk/?wfo=psr). https://www.wrh.noaa.gov/wrh/heatrisk/?wfo=psr). at product(shown forecast "HeatRisk" based the on risk of heat-related illness and health impacts following the experimental "HeatRisk" forecast product. forecast heat-related illness "HeatRisk" andexperimental risk of following the healthimpacts warrant warninga (includesUrban and Advisories). Flood Areal and SmallStream that are expected to rise above flood stage or is already at or above flood stage during stage flood above rapid or isalreadyrises. at or stage flood above rise to expected that are Note: Heat advisories are not issued for the rest of the CWA's lower elevation forecast zones. zones. forecast CWA'selevation rest the lower for the of issued not are advisories Note: Heat occurring or imminent (based on radar (basedon occurring indication, imminent indication reliable satellite or and/or reports). duration of unusual heat, and (as represented by overnight low temperatures). temperatures). low overnight represented by (as humidity and heat, unusual of duration Widespread blowing dust reducing visibilities to 1/4 mile or less is occurring imminent. less Widespreador or blowing mile dustreducing 1/4 visibilitiesto Localized blowing dust reducing visibilities to 1/4 mile or less is occurring imminent. less or blowingLocalized mile dustreducing 1/4 visibilitiesto when there is concern about a potential dam or levee failure that is not imminent. failurenot that is levee or dam a potential about is concern when there Radar indication and/or reliable reports of a tornado or developing tornado. or Radartornado a indication reliableof and/or reports Highlights the threat of a thunderstorm that is just below severe criteria. severe Highlights is justbelow thunderstorm that a of the threat experimental "HeatRisk" forecast product. forecast "HeatRisk" experimental imminent. imminent. (updated 6 October 2020) 2020) October 6 (updated "Moderate" (significant) "Moderate"

WIND DUST SEVERE T-STORM FLOODING HEAT High Wind Watch Normally issued 12-48 hours in advance of when sustained wind speeds of 40 mph or greater and/or any non-convective wind (NPWPSR) gusts of 58 mph or greater are expected.

Wind Advisory (NPWPSR) Sustained wind speeds of 30-39 mph and/or any non-convective wind gusts of 40-57 mph are occurring or imminent. WIND

Extreme fire danger and/or fire behavior is occurring or imminent due to critically dry fuels and strong winds (determined by the geographical criteria given below) combined with relative of 15% or lower: Fire Weather Zones 131, 132, 13, 221 (Arizona and Lower Colorado River Valley): "High", "Very High", or "Extreme" NFDRS fire (RFWPSR) danger with 20-ft (33-ft) winds sustained at 20+ mph (25+ mph) or gusts of 35+ mph lasting for 3+ hours. Fire Weather Zones 230 and 232 (SE California excluding the Lower Colorado River Valley): "Very Dry" or "High Risk" Significant Fire Potential with 20-ft or 33-ft wind gusts of 35+ mph lasting for 6+ hours (or widespread dry lightning).

Fire Weather Watch FIRE WEATHER Normally issued 12-72 hours in advance of when there is a high potential of extreme fire danger and/or fire behavior. (RFWPSR)

Winter weather conditions (including heavy snow, sleet, ice, and/or blowing snow) that pose a significant threat to life and/or Warning property are occurring or imminent. Warnings for heavy snow are issued based on elevation as follows: (WSWPSR) Below 5000 feet: 4+ inches in 24 hours (including for the desert floor); Above 5000 feet: 8"+ in 24 hours An impactful winter weather event is occurring or imminent including any freezing rain or drizzle, blowing snow that is causing visibilities of 1/4 mile or less, or snow. Advisories for snow are issued based on elevation as follows: (WSWPSR) Below 5000 feet: 2-3+" in 24 hours (or any snow accumulation on desert floor); Above 5000 feet: 3-7"+ in 24 hours Normally issued 12-96 hours in advance of impactful winter weather conditions (including heavy snow, sleet, ice, and/or blowing (WSWPSR) snow) that may pose a significant threat to life and property. Temperatures of 32oF or lower are occurring or imminent for the first time of the winter season or any occurrence in major (NPWPSR) population areas. Note: Also issued after first verifying freeze elsewhere if widespread impacts are possible. Normally issued 2-5 days ahead of when temperatures of 32oF or lower are expected for the first time of the winter season (or (NPWPSR) any occurrence in major population areas or if widespread impacts are possible elsewhere). WINTER WEATHER Temperatures of 28oF or lower are occurring or imminent for any occurrence in major population or lower desert areas or the first Hard Freeze Warning time of the winter season for higher elevation zones. Note: Also issued after first verifying hard freeze for the higher deserts (NPWPSR) (Wickenburg & Globe) if widespread impacts are possible; Not issued for higher elevation zones. Hard Freeze Watch Normally issued 2-5 days ahead of when temperatures of 28oF or lower are expected for major population or lower desert areas (NPWPSR) (or widespread impacts are possible for the higher deserts). Note: Not issued for higher elevation zones. Dense Advisory Widespread or localized (patchy) fog reducing visibilities to 1/4 mile or less is occurring or imminent. (NPWPSR) Triggered when the Arizona Department of Environmental Quality (ADEQ) issues a high pollution advisory due to ozone or coarse Air Quality Alert (AQAPSR) OTHER or fine particles. This product is most frequently issued for Maricopa, Pinal, and Yuma Counties.