Wednesday, August 03, 2016

Flash Flood Watch Continues

Just a quick post this morning. View above is from Kitt Peak toward north at about 7:20 am MST. Moderate tower is poking into some sunshine. Looks like some work going on at one of major telescopes.

There was flash flooding around the area yesterday, especially to the southeast around Vail. A flash flood watch continues through noon today for most of southeast Arizona.

Storms produced heavy rains yesterday at some places (only 0.22" here) but there was little in the way of lightning - plot below shows CG flash density from and Vaisala for 12-hours ending at 6:45 am. Very moist and tropical atmosphere produced heavy showers with little ice involved aloft. 

Amazing how fast everything is growing after a few consecutive days of rain.

Today's TWC sounding continues with 2 inches PW and considerable CAPE if there were sunshine or some forced vertical motion. The 500 mb analysis for 12 UTC below is from the NAM. As for significant organized circulations, there are none south of northern Nevada and Utah. Vertical motion and storms will continue very dependent upon smaller-scale forcing.

1 comment:

  1. Good morning Bob: The monsoon air mass made a quite literal "big splash" across Maricopa County the past three days and especially yesterday. After receiving only 0.36inches of rain in July, it felt good to get drenched by 1.14in/34 min in a cloudburst yesterday afternoon. The outflow form this storm complex sent an outflow boundary into central Phoenix that dropped 1-3 inches of rain in 45-90 minutes with subsequent urban flooding that shut down I-17 North at Indian School and the I-10/51 interchange both during the height of the rush hour.

    One other comment about the lack of CG's. First, the storms up here in Maricopa County were at their peak from 330PM(2230Z)to 630PM(0130Z) with little CG activity after 0200Z except for a lingering remnant of the rush hour storm that moved south to Casa Grande. During the height of the storms many people reported nearly continuous lightning and thunder. While I can't speak for the central Phoenix storm, the strong storms along Carefree Highway featured mostly in-cloud lightning. In fact many of the storms in the past five day period up here were very electrically active but mostly of the in-cloud variety. The CG plots wouldn't pick up this activity and might under-estimate storm location and intensities. Adios for now, Jack