The National Weather Service in Phoenix issued a dust storm advisory early Thursday for east-central La Paz, northeastern Yuma, and Maricopa counties in Arizona, warning of reduced visibility and strong winds. Officials said the advisory was prompted by a dust channel near Wintersburg producing winds over 40 mph and visibility less than one mile, creating hazardous travel conditions along Interstate 10.
The dust storm advisory issued by the National Weather Service (NWS) in Phoenix at 12:02 a.m. MST Thursday, August 20, 2026, was set to expire at 1 a.m. MST and covered east-central La Paz County, northeastern Yuma County, and Maricopa County. This channel produced sustained winds exceeding 40 mph and visibility reduced to less than one mile, creating hazardous travel conditions along Interstate 10 between mile markers 55 and 103, according to the NWS. The advisory specifically named impacted locations including Tonopah, the Palo Verde Nuclear Generation Station, and Wintersburg, highlighting risks to both local communities and critical infrastructure.
The advisory was prompted by a dust channel near Wintersburg, located about eight miles southwest of Buckeye, moving west at 25 mph.
Earlier forecasts from August 19 indicated strong winds and blowing dust would affect Maricopa and northern Pinal counties from 5 p.m. to 10 p.m. local time. These forecasts predicted wind speeds between 45 and 55 mph with visibility dropping below one mile in areas south of Interstate 10 and State Route 202, including communities such as Avondale and Queen Creek. Meteorologists attributed these conditions to monsoon-related outflow winds generated by convective storms in surrounding regions, which were expected to carry dust-laden gust fronts across county lines, according to NWS forecast discussions.
On the evening of August 19, a powerful dust wall reached the Phoenix Valley around 9:30 p.m., prompting NWS advisories for multiple communities, including Buckeye, Avondale, South Mountain, Ahwatukee, and the Southeast Valley extending toward Queen Creek. Federal meteorologists issued a specific dust storm warning for Queen Creek and parts of Pinal County, noting the dust wall was moving northwest at approximately 25 mph. Utility providers reported widespread power outages linked to the storm, with about 17,000 customers affected in Maricopa County, more than 1,000 in Pinal County, and nearly 3,000 additional outages in Maricopa County from a second provider, illustrating the storm’s extensive impact on infrastructure and residents.
Meanwhile, in the central United States, the National Weather Service Storm Prediction Center issued Severe Thunderstorm Watch #0603 early Thursday morning for Western Kentucky and Middle Tennessee. The watch was effective from 12:10 a.m. to 6 a.m. CDT on August 20 and covered an area approximately 40 miles north and south of a line from 35 miles west-southwest of Fort Campbell, Kentucky, to 35 miles south-southeast of Bowling Green, Kentucky. The watch warned of scattered large hail, including isolated hail up to 2 inches in diameter, damaging wind gusts up to 70 mph, and the potential for one or two tornadoes. Probabilistic guidance indicated a 5% chance of tornadoes, 15% for hail, and 30% for damaging winds within the watch area.
Severe thunderstorm warnings were issued around 12:32 a.m. CDT for multiple Kentucky counties, including Marshall, Calloway, Graves, and Hickman, by the Paducah NWS office. These warnings, some expiring as late as 4:15 a.m. CDT, reflected ongoing severe weather activity overnight. Radar and spotter reports indicated winds exceeding 60 mph and hail approaching quarter-size, though specific warning texts were not publicly summarized. The warnings covered a cluster of counties including McCracken and Calloway, showing a pattern of severe storms affecting multiple counties simultaneously.
Further east, forecasts for parts of the Mid-Atlantic region, including southeastern Pennsylvania, central and southern New Jersey, north-central and eastern Virginia, Delaware, and Maryland, indicated an 80% probability of a severe thunderstorm watch issuance on August 20. Meteorologists anticipated thunderstorms capable of producing strong to severe wind gusts spreading toward coastal areas through the early evening hours. The Washington, D.C., area and surrounding counties were expected to experience numerous thunderstorms between 2 p.m. and 8 p.m., with risks of damaging winds, isolated tornadoes, and urban flash flooding, particularly near and northeast of Baltimore. Additional forecasts for northeast New Jersey, New York City, and western Long Island mentioned an isolated threat for damaging wind gusts and tornadoes, suggesting a widespread severe weather threat across multiple counties in the Mid-Atlantic and Northeast.
Internationally, the India Meteorological Department issued subdivision-wise warnings valid for August 20, 2026, including thunderstorm and lightning advisories with squalls and strong surface winds for regions such as Tamil Nadu, Puducherry, Haryana, Chandigarh, and Delhi. These warnings covered multiple districts within each subdivision, indicating broad regional concerns for severe or near-severe convective weather events across large areas of India. The IMD’s official products highlighted the potential for thunderstorms accompanied by strong winds and heavy rain, underscoring the widespread nature of convective hazards on that day.
The combination of dust storm advisories in Arizona, severe thunderstorm watches and warnings across parts of Kentucky and Tennessee, and forecasts for severe weather in the Mid-Atlantic and parts of India reflect a multi-regional pattern of hazardous weather on August 20, 2026. Officials continue to monitor these evolving conditions as the day progresses.
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