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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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At 628 PM MDT, Doppler radar was tracking showers and thunderstorms with gusty winds over Jefferson and Broadwater counties. Movement was north northeast. HAZARD…Wind gusts up to 50 mph. SOURCE…Radar indicated. IMPACT…Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include… Helena, Townsend, Boulder, East Helena, Montana City, Basin, Wickes, Rimini, Alhambra, Spring Meadow Lake State Park, Corbin, Austin, Elkhorn State Park, Winston, Radersburg, Silos, Clancy, Jefferson City, and Goose Bay.

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At 628 PM MDT, a severe thunderstorm was located 11 miles west of Baker, moving southeast at 35 mph. HAZARD…60 mph wind gusts and quarter size hail. SOURCE…Trained spotters reported quarter sized hail 2 miles north of Ismay, MT. IMPACT…Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include… Baker, Plevna, Westmore, Willard and Ollie.

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* WHAT…Flooding caused by excessive rainfall is expected. * WHERE…A portion of southeast Texas, including the following county, Harris. * WHEN…Until 945 PM CDT. * IMPACTS…Minor flooding in low-lying and poor drainage areas. Ponding of water in urban or other areas is occurring or is imminent. * ADDITIONAL DETAILS… – At 728 PM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2.5 inches of rain have fallen. – Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. –

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