Roger's SkyPix

Mini Cloud Atlas

Advancing Mammatus over the NWC

Advancing Mammatus over the National Weather Center

There's a dark storm comin'! Convectively driven mammatus appears under the anvil shields well-organized and intense convection, either in front of or behind the storm. The latter accounts for most of the brilliantly colored sunset shots. On the other side, the advance mammatus adds to the foreboding and threatening mood overhead, enhanced by the eerie darkness of a western sky that's not supposed to be that way at this late-afternoon hour. A bow echo, part of a larger squall line, soon would move through, providing some gusty winds followed by an occasional electrical show on the rear side.

Norman OK (10 Feb 9) Looking SW