1,237 first-hand accounts of flood events in Arizona, ranked by impact. Each is a NOAA-written narrative of the moment.
A classic bow echo developed along the Mogollon Rim in central Arizona around 1900MST on the 13th and merged with thunderstorm clusters that developed in south-central Arizona around 2030MST to form one southwestward-moving MCS that progressed all the way to the town of Yuma in…
Read the full account →A deep closed low along the California coast and broad upper level ridging centered over the southern Plains promoted deep southerly flow across the Desert Southwest.
Read the full account →Anomalous snowfall across the high terrain of Arizona as well as lower elevation rainfall led to greater than normal runoff into the Salt and Verde watersheds.
Read the full account →A retrograding upper level low combined with anomalously high moisture levels led to showers and isolated thunderstorms producing heavy rainfall and numerous instances of considerable flash flooding across south-central Arizona on the 25th.
Read the full account →Favorable monsoonal conditions promoted the development of severe thunderstorms across the region on the 18th. Abundant moisture (PWATs of 1.7-2.0) and instability (MUCAPE 1,000-2,000 J/kg) was in place across south-central and southwest Arizona, while increased easterly…
Read the full account →What was Major Hurricane Rosa crossed the northern Baja peninsula as a tropical depression October 1st. The remnant circulation entered southwest Arizona on October 2nd. Moisture ahead of these remnants fueled thunderstorms in southeast Arizona on September 30th.
Read the full account →A slow moving upper level weather system produced periods of heavy rain across southeast Arizona July 24 and 25, especially in Pinal and Pima counties.
Read the full account →A slow moving upper level weather system produced periods of heavy rain across southeast Arizona July 24 and 25, especially in Pinal and Pima counties.
Read the full account →A slow moving upper level weather system produced periods of heavy rain across southeast Arizona July 24 and 25, especially in Pinal and Pima counties.
Read the full account →A retrograding upper level low combined with anomalously high moisture levels led to showers and isolated thunderstorms producing heavy rainfall and numerous instances of considerable flash flooding across south-central Arizona on the 25th.
Read the full account →A retrograding upper level low combined with anomalously high moisture levels led to showers and isolated thunderstorms producing heavy rainfall and numerous instances of considerable flash flooding across south-central Arizona on the 25th.
Read the full account →An upper level trough and lead-on shortwave trough moved through Arizona during the day on the 18th. Moderate to high instability and high moisture content supported scattered strong thunderstorms.
Read the full account →Multiple rounds of thunderstorms developed and moved across southeast Arizona from mid morning of August 16 through the early evening of August 17.
Read the full account →Thunderstorm activity developed across much of eastern AZ, along the higher terrain features, during the early afternoon hours. Outflow boundaries emanating from the activity over the higher terrain areas sparked a complex of robust thunderstorms over Pinal County.
Read the full account →During the early morning hours on September 23rd, copious tropical moisture began to spread north and into south-central Arizona. A weather system dropping south out of Nevada began to act on the moisture, resulting in the development of numerous showers and thunderstorms.
Read the full account →Daytime heating combined with divergence aloft associated with an easterly wave near the Arizona/New Mexico border promoted thunderstorm initiation across southeast Arizona during the afternoon of the 30th.
Read the full account →High pressure situated south of the International Border led to a westerly flow aloft, which caused dry air advection. However, there was still sufficient moisture (PWAT around 1.5 inches) and instability (MLCAPE 1000-2000 J/KG) as well as a subtle disturbance in the…
Read the full account →A nearly stationary upper-level trough combined with tropical moisture remnants from Tropical Storms Priscilla and Raymond, which developed off the eastern Pacific, led to scattered to widespread thunderstorm activity across much of south-central AZ.
Read the full account →An upper-level trough moving through the area providing strong upper-level ascent combined with MLCAPE values between 1500-3000 J/kg and PWAT values between 1.8-2.0 (associated with the remnants of Tropical Cyclone Lorena) resulted in numerous showers and thunderstorms across…
Read the full account →A very active monsoon period occurred September 12th and September 13th across Southeastern Arizona. Strong to severe thunderstorms began in the late morning on September 12th and continued through the overnight hours of September 13th.
Read the full account →A retrograding upper level low combined with anomalously high moisture levels led to showers and isolated thunderstorms producing heavy rainfall and numerous instances of considerable flash flooding across south-central Arizona on the 25th.
Read the full account →Strong to severe thunderstorms developed in an unstable atmosphere in the afternoon of the 22nd. Storms initially developed over the high terrain of northern and eastern Arizona as well as near the Table Top mesa area south of Phoenix.
Read the full account →A classic bow echo developed along the Mogollon Rim in central Arizona around 1900MST on the 13th and merged with thunderstorm clusters that developed in south-central Arizona around 2030MST to form one southwestward-moving MCS that progressed all the way to the town of Yuma in…
Read the full account →Daytime heating combined with divergence aloft associated with an easterly wave near the Arizona/New Mexico border promoted thunderstorm initiation across southeast Arizona during the afternoon of the 30th.
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