Monday, August 23, 2010

As Good As It Got Here Yesterday




Top photo shows heavy anvil and mammatus at sunset yesterday, which was as good as it got yesterday. Was mostly a down day across southeastern Arizona. Storms generally on high mountains, with anvils overspreading lower elevations. A bad wind profile to start the day got worse by evening. Across the Pima County ALERT network 14 of 93 stations had measurable rainfall in past 24-hours. One reporting station and four RAWS stations also had light rainfall. The only signficant amount I found was 1.22" at Florida Canyon yesterday afternoon. Looks like coverage was at most 10% yesterday across southeast Arizona, probably less.
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Have an appointment this morning and so here's my quick assessment of things. Really bad wind profile today with southwesterly or light and variable through troposphere (see Tucson morning sounding middle); PW down some into middle 30s mm, but sounding seems much more wet than that and is suspect I guess that we'll have small to moderate CAPE this afternoon (note that Wyoming and SPC sounding plots only have partial data, so something seems awry) Edited at 11:30 to add : Back from appointment and have taken a closer look at Tucson sounding and PW. The sounding appears to have a bit more than 40 mm of PW and is only about 2 mm too wet. The PW data I looked at at Atmo time series page this morning was probably old, and I didn't notice that. Atmo is apparently totally down this morning, since I can't get at their page now and there are no e-mails from Leuthold; tail end of western trough at 500 mb (see bottom image) stalls over Arizona, leaving us with a stagnant large-scale setting. So, mountain storms try to drift off mostly toward north slopes. Don't expect anything here at house unless a cell would develop right overhead. In longer-term this week it still looks like a backdoor front event early am on Wednesday. Longer range models bring Frank up our way toward end of week. But, they also show a monsoon-busting deep trough at 500 mb digging into the west coast.


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