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* WHAT…Flooding caused by excessive rainfall is expected. * WHERE…A portion of South Central Arizona, including the following county, central Pima. * WHEN…Until 1030 PM MST. * IMPACTS…Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS… – At 836 PM MST, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 0.7 and 1.2 inches of rain have fallen. – Some locations that will experience flooding include… No:ligk, Cababi, San Luis – Sells District, Rincon and Sikul Himathk. – http://www.weather.gov/safety/flood

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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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* WHAT…Arroyo and small stream flooding caused by excessive rainfall is expected. * WHERE…Portions of central and north central New Mexico, including the following counties, in central New Mexico, Bernalillo. In north central New Mexico, southeastern Sandoval. * WHEN…Until 1230 AM MDT. * IMPACTS…Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Dangerous flows over low-water crossings. Water over roadways. Overflowing poor drainage areas. * ADDITIONAL DETAILS… – At 924 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause arroyo and small stream flooding. Up to 2 inches of rain have fallen, but the first inch fell earlier in the

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The combination of clearing skies, light winds, and lingering low-level moisture will result in valley fog developing and possibly becoming rather dense overnight. The most extensive fog will be found in the river valleys and over bodies of water. Visibilities may drop below a quarter of a mile in spots. Be sure to slow down and use low-beam headlights if you encounter fog.

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