RSS feed source: US National Weather Service

The South Carolina Department of Environmental Services in Columbia SC has issued a Code Orange Ground Level Ozone Action Day for the Upstate and Catawba regions region of South Carolina, from 10 AM this morning to 8 PM EDT this evening. Conditions will be favorable for elevated ozone levels today. An ozone action day means that atmospheric conditions will likely produce unhealthy concentrations of ground level ozone air pollution. A Code Orange forecast indicates that ground level ozone concentrations are expected to be unhealthy for sensitive groups, which includes people with lung disease, older adults, and children. Sensitive groups should reduce prolonged or heavy outdoor exertion, take more breaks, and do

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RSS feed source: US National Weather Service

* WHAT…Flooding caused by excessive rainfall is expected. * WHERE…A portion of south central Arizona, including the following county, Maricopa. * WHEN…Until 515 AM MST. * IMPACTS…Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS… – At 252 AM MST, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. – Additional rainfall amounts of 0.25 to 0.75 inches are expected over the area. This additional rain will result in minor flooding. – Some locations that will experience flooding include… Phoenix, Glendale, Peoria, Surprise, Avondale, Goodyear, Buckeye, El Mirage, Youngtown,

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* WHAT…Temperatures in the mid 30s will result in frost formation, especially in the valleys. * WHERE…In Maryland, Western Garrett County. In Virginia, Western Highland County. In West Virginia, Western Grant and Western Pendleton Counties. * WHEN…Until 8 AM EDT this morning. * IMPACTS…Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

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Background:

Volcán Popocatépetl, whose name is the Aztec word for smoking mountain, towers to 5426 m 70 km SE of Mexico City to form North America’s 2nd-highest volcano.  The glacier-clad stratovolcano contains a steep-walled, 250-450 m deep crater.  The generally symmetrical volcano is modified by the sharp-peaked Ventorrillo on the NW, a remnant of an earlier volcano. 
At least three previous major cones were destroyed by gravitational failure during the Pleistocene, producing massive debris-avalanche deposits covering broad areas south of the volcano.  The modern volcano was constructed to the south of the late-Pleistocene to Holocene El Fraile cone.  Three major plinian eruptions, the most recent of which took place about 800 AD, have occurred from Popocatépetl since the mid Holocene, accompanied by pyroclastic flows and voluminous lahars that swept basins below the volcano.  Frequent historical eruptions, first recorded in Aztec codices, have occurred since precolumbian

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