This evening I want to talk about this amazing storm impacting southern Alaska. Here's a visible satellite image from a polar-orbiting satellite from 2332Z this afternoon:
|Fig 1 -- POES AVHRR Channel 1 visible image from 2332Z, April 7, 2011.|
|Fig 2 -- Northern Hemisphere 18Z analysis of surface mean sea-level pressure (contours) and 500mb height (colors) on April 7, 2011.|
|Fig 3 -- HPC surface analysis at 2100Z, April 7, 2011.|
But just because this low is occluding and weakening doesn't mean it's not packing a punch. High winds behind that still-powerful cold front are impacting all of southern Alaska. Anchorage is under a high-wind warning, with wind gusts up to 60 mph already reported in the city itself. At the Glen Alps area up in the Chugach foothills east of town, winds up to 100 mph have been reported--greater than hurricane force winds on the east side of Anchorage. Combine this with heavy snow falling to the east and further enhanced by the lift provided by the front and it's a rough weather day in south-central Alaska.
We can see evidence of these winds if we zoom in on the visible satellite image:
|Fig 5 -- POES AVHRR Channel 1 visible image from 2332Z, April 7, 2011.|
You can see how quickly things changed when the front came through. At 1:42 PM Alaska time, this was the view looking southeast across Anchorage:
|Fig 6 -- FAA Southeast Anchorage webcam at 1:42 PM, Alaska time, April 7, 2011.|
|Fig 6 -- FAA Southeast Anchorage webcam at 2:42 PM, Alaska time, April 7, 2011.|
I will talk about the severe weather potential for the central US late this weekend in the next day or so. I promise...