Today's morning sounding from Yuma indicated a strong, surface-based temperature inversion. Apparently the first tilt (0.5 degree) of the Yuma NWS Doppler radar was experiencing ducting because of the inversion and actually getting strong return from waves over the north end of the GoC (see above). At the second tilt (1.5 degrees) most of the anomalous echo was gone - below. Both graphics are from just before 7 am MST.
The Yuma radar's storm total rainfall estimate from 8:16 am this morning is shown above. There were a couple of spots where the ground and sea clutter were identified as precipitation, leading to some strange rain estimates. The small area of "rock rain" along I-8 in southern California shows rain estimated at more than 8 inches. The sea clutter "rain" area over the northern GoC reaches to about four inches. The rain area estimate over western Pima County was probably associated with a nearly stationary, strong thunderstorm yesterday evening.
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