Actually, Hugh, I don't think pure white in and of itself means all that much besides it has quite cold cloud tops. What we need to look for is how curved the Dvorak imagery is.

Looking at the latest SSD imagery, looks like it's got a part spiral coming off it, placing it somewhere between 2.5 and 3.5 on the Dvorak scale. Officially, the last call listed on SSD is 3.0, so it really hasn't intensified (as far as SSD is listing), it's just gotten colder (which could be an indication of intensification in progress, but it is not in and of itself an indication of higher intensity).

See for Dvorak visual reference: http://web.archive.org/web/2005090620254..._guide_to_d.htm

For others:
SSD imagery: http://www.ssd.noaa.gov/PS/TROP/float1.html
SSD intensity (Dvorak numbers): http://www.ssd.noaa.gov/PS/TROP/positions.html

Enjoy!

I'm hoping Bertha goes spinning fish.