Category Archives: Northeastern Pacific

Cold pools formed by precipitating trade Cu invigorate new convection

In the sunglint region of the Aqua swath (22:20 UTC, July 19th, during Research Flight 07 of the NSF CSET project), you can clearly see cold pool boundaries in the sea-state. Presumably changes in capillary waves amplitudes associated with different wind speeds are altering the amount of sunglint. I suspect that the mean wind here is pretty light in order to see strong reflections. You can also see a band of new cumulus clouds at the convergence of the outflows.


Open cells off the Washington coast

Excellent case of open cells of the Washington coast seen with WorldView, Turning to cumulonimbus onshore. April 1st 2015. It was the loudest thunder I ever heard in Seattle.

The image below shows a zoomed in portion, this time using the 3-6-7 MODIS channel blend (0.4,1.6,2.1 micron). Look carefully at the centers of the open cells. Quite a few have little patches of what I take to be evaporating precipitation/cloud. They actually show up slightly blue in the 3-6-7 blend.


NE Pacific stratocumulus features

Marine stratocumulus and overlying clouds west of Baja California, here seen in Worldview using MODIS channels 3-6-7.

To the NW, and west of California, in this MODIS image,┬áit looks like compensating subsidence from the NW-SE precipitating feature is quite dramatic. Impact on region albedo? I don’t think these systems can be perturbed by anthropogenic aerosol once they get going. The timescale for aerosol recycling is very short in such systems I would guess, but that still remains to be determined.