Severe weather outbreak across the United States has left at least 4 people dead and dozens injured over the weekend. At least 11 million people throughout the country were on alert on Sunday, June 28, 2015.
Supercell thunderstorms, tornadoes, heavy rain, large hail and flash floods were observed over parts of Missouri, western Illinois, North Dakota and southeast Iowa.
Hail as large as 3.8 cm (1.5 inches) was reported near Denver, Colorado and in central Saint Louis, Missouri.
Lightning strike injured 16 people on a mountain SW of Denver, Colorado.
A massive dust storm, the first of the 2015 monsoon season, blew through Phoenix, Arizona on Saturday, June 27, 2015 leaving more than 15 000 customers without electricity.
Short Range Forecast Discussion issued by NWS Weather Prediction Center at 07:31 UTC on Monday, June 29, said severe thunderstorms are still possible for portions of the Midwest and Ohio River valley while well above average temperatures are expected to continue across the Pacific Northwest.
"A surface low pressure system will move across the Ohio River valley today, resulting in an increase in showers and thunderstorms across this area. The Storm Prediction Center is forecasting a slight risk of severe thunderstorms for portions of the Ohio valley. Please refer to products issued by the SPC for further details on the severe weather threat. Rain and thunderstorms associated with system will spread northeastward into the Lower Great Lakes and portions of the Northeast on Tuesday. A second low pressure system will move from Canada into the Midwest and Upper Great Lakes today. Additional showers and thunderstorms, some of which may be severe, are possible in this area.
A strong ridge of high pressure at the mid and upper-levels of the atmosphere will remain in place across the West over the next couple days. Sinking air across the region resulting from the ridge will continue to promote well above average temperatures. High temperatures today and Tuesday will be 10 to 20 degrees above average across much of the northwestern U.S. and northern Intermountain West. Some moisture from the Gulf of Mexico will persist across the West, promoting the development of afternoon showers and thunderstorms, primarily in areas of terrain. Dry conditions will persist across most areas, however.
An upper-level disturbance will move along the northern periphery of the ridge tonight into Tuesday. As the disturbance crosses the northern Intermountain states a surface low pressure system will develop and move into the northern plains on Tuesday, bringing a chance of showers and thunderstorms."
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