Flash Flood Warnings Extend Across Arizona Counties as Heavy Rain Continues

Multiple flash flood warnings and a severe thunderstorm warning remain in effect overnight across parts of Arizona, New Mexico, Missouri and New Jersey as Doppler radar shows thunderstorms producing heavy rain and flash flooding.

Active Flash Flood Warnings in Arizona

The National Weather Service in Tucson has extended a Flash Flood Warning for southeastern Pima County in southeastern Arizona and north central Santa Cruz County in southeastern Arizona until 2:15 a.m. MST. [1] At 12:39 a.m. MST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. [1] Between 0.5 and 1.5 inches of rain have fallen, with additional rainfall amounts of 0.5 to 1.5 inches possible in the warned area. [1] Flash flooding is ongoing or expected to begin shortly. [1] The National Weather Service in Tucson has also issued a Flash Flood Warning for central Pima County in southeastern Arizona until 2:15 a.m. MST. [4] At 12:13 a.m. MST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. [4] Flash flooding is ongoing or expected to begin shortly. [4] The hazard in both warnings is flash flooding caused by thunderstorms, with the source listed as radar indicated. [1] [4] The impact includes flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. [1] [4]

Flash Flooding Underway in New Mexico

At 1:33 a.m. MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area in Quay County, New Mexico. [2] Between 1.5 and 3 inches of rain have fallen, with additional rainfall amounts up to 0.5 inches possible in the warned area. [2] Flash flooding is ongoing or expected to begin shortly. [2] The hazard is flash flooding caused by thunderstorms, with the source listed as radar indicated. [2] The impact includes flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. [2]

Ongoing Flooding in New Jersey

At 3:06 a.m. EDT, Doppler radar and automated rain gauges indicated thunderstorms produced heavy rain across the warned area in Morris County, New Jersey. [5] Between 1.5 and 2.5 inches of rain have fallen. [5] Flooding impacts will continue, but no additional rainfall is expected. [5] Flash flooding is ongoing or expected to begin shortly. [5] The hazard is flash flooding caused by thunderstorms, with the source listed as radar and automated gauges. [5] The impact includes flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other poor drainage and low-lying areas. [5]

Severe Thunderstorm Warning in Missouri

At 2:16 a.m. CDT, severe thunderstorms were located along a line extending from near La Monte to near Sedalia to near Green Ridge in Pettis County, Missouri, moving east at 35 mph. [3] The hazard is 60 mph wind gusts, with the source listed as radar indicated. [3] The impact includes expected damage to roofs, siding, and trees. [3] Locations impacted include Sedalia, La Monte, Smithton, Green Ridge, Houstonia, Hughesville, and Sedalia Memorial Arpt. [3]

Radar-Indicated Thunderstorm Activity

All of the active warnings rely on Doppler radar and automated gauges to detect heavy rain and severe conditions in real time across the affected regions. [1] [2] [3] [4] [5] In Arizona, radar showed thunderstorms producing heavy rain with specific rainfall totals already recorded and more possible before the warnings expire. [1] [4] In New Mexico, radar indicated the rainfall amounts that have already fallen and the limited additional rain still possible. [2] In Missouri, radar tracked the line of severe thunderstorms and their eastward movement along with the associated wind gusts. [3] In New Jersey, the combination of radar and automated rain gauges confirmed the rainfall totals and confirmed that no further rain is expected even as flooding persists. [5] These real-time detections allow the National Weather Service to issue and extend warnings based on observed conditions rather than forecasts alone.

What to watch next: Residents in the warned areas should continue monitoring updates from the National Weather Service as the flash flood warnings in Arizona remain in effect until 2:15 a.m. MST and the severe thunderstorm warning covers the listed communities in Pettis County.