Wednesday, July 21, 2021

Wet Week Continues

Couple of lenticulars over the Catalinas at sunrise this morning.

ALERT data (above) shows rainfall for 24-hours ending at 7:00 am MST this morning. There were 7 sites with half an inch or more, but none over an inch. Here at house we had thunder and a shower a bit before 8:00 pm that left only 0.10" in the gauge; TUS had 0.01"; DM 0.03", and Atmo got a heavier shower with 0.46". Thunderstorm areas in eastern Pima County indicated below on plot of CG flashes (from Atmo and Vaisala) detected during 24 hours ending at 2:30 am this morning.

Map of TPW at 13 UTC (above) shows very high values well up the lower Colorado Basin and most of southern Arizona. The swirl at 120 W is remnant low from Tropical Storm Guillermo. 

Flash Flood Watches are in effect for parts of Arizona, New Mexico, and Colorado. Watch in Arizona is valid Thursday night through the day Saturday.

The morning 500 mb chart (above) shows anticyclone centered near Four Corners and weak short wave eastern New Mexico. By midnight Saturday night the shortwave is forecast to evolve into a slow moving, closed low over southeastern Arizona (below), that brings the threat of heavier rains into the weekend.

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