Tuesday, October 02, 2018

Rosa Now Dissipated

The low-level circulation that remained of once Hurrican Rosa completely dissipated last night over northern Baja. All that remains is a weak wave at 500 mb, and abundant residual moisture and showers.

Rain event yesterday ended across main metro area by around 3:00 pm MST. ALERT maps above and below are for 24-hours through 5:00 am this morning, There was little rainfall, after the rains ended, through evening and night.

Here at house we had 0.46" yesterday and 0.04" the day before. Ron Holle reports 1.21" at his place in Oro Valley, which fits with swath of heaviest rainfall that stayed south and west of the central metro area.

There was little thunderstorm activity in Arizona, except in Cochise County (plot of detected CG flashes above is for 24-hours ending at 6:00 am - from Atmo and Vaisala). There was more storm activity over northern GoC and Sonora.

Map below (from Flood Control District Maricopa County) is for blended radar estimates adjusted by observed point rainfalls (produced by WDT and available on FCDMC webpage). This product picked up the swath of heavy rain west of city quite well, and indicated large areas of heavy rains over parts of southwestern Arizona.

The morning skew-T plot of TWC upper-air data at bottom remains very moist and somewhat unstable - this should certainly support showers around today, as well as perhaps a thunderstorm.

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