Friday, March 27, 2009

March 27th Midday Update On Mount Redoubt; Volcano Quiet After Two Eruptions, Ash Officially Recorded In Anchorage, Ash Advisory For Susitna Valley

Click HERE to view all previous posts on the 2009 Mt. Redoubt episode in inverse chronological order, with the most recent post appearing first.

Webicorder output captured from this morning. Though a bit difficult to read, you can see towards the middle of the chart the prolonged eruption beginning at 11:48 P.M., then down towards the bottom, the second shorter eruption beginning at 8:40 A.M. Note that some output so saturates the chart that it bleeds over into adjacent time lines.

As of 2:00 P.M. Alaska time on March 27th, 2009, Mount Redoubt is currently quiet after two vigorous earlier eruptions, one last night at 11:48 P.M. which lasted about two hours, and a second briefer eruption to 50,000 feet at 8:40 A.M. this morning. A special weather statement about possible ashfall in the Anchorage Bowl has been cancelled, as has an earlier ashfall advisory over the northern Kenai Peninsula. Only an ashfall advisory for the southern Susitna Valley remains in effect, and will most likely not be extended beyond 3 P.M. unless Mt. Redoubt erupts again within the next couple of hours. Some flights into Anchorage are tentatively resuming.

Stories from the Anchorage Daily News and Alaska Dispatch, and a first-person account from a lodge owner just 35 miles south of Mount Redoubt published by the Peninsula Clarion.

However, for the first time since this episode began, ashfall was officially recorded in the Anchorage Bowl, although only a trace. The weather observation sequence from Merrill Field last night reflects it. It is indirectly accessible by clicking HERE, then selecting Merrill Field from the list, and then selecting 12 hours (it will eventually become inaccessible as newer weather obs displace the older information):

SPECI PAMR 271215Z 19007KT 5SM -SN OVC020 01/M01 A2947 RMK AO2 4/009 P0000=

SPECI PAMR 271246Z 17006KT 2 1/2SM -SN VA BKN012 OVC028 01/M01 A2947 RMK AO2 P0000=

METAR PAMR 271253Z 18005KT 2 1/2SM -SN VA BKN012 OVC028 01/00 A2947 RMK AO2 SLP982 P0000 T00060000=

SPECI PAMR 271301Z 18006KT 4SM -SN VA BKN012 OVC028 01/M01 A2947 RMK AO2 P0000=

SPECI PAMR 271336Z 00000KT 7SM -SN SCT028 OVC050 01/M01 A2947 RMK AO2 P0000=

VA is the contraction for volcanic ash. Times are local. No ashfall was officially recorded at Anchorage International Airport. Both sites have certified contract weather observers who take official weather obs to National Weather Service standards. But the ash was intermingled with the precip, and there's currently no sign of any ash on the ground, although I did detect a faint sulfur odor in the air.

While high-level wind flow (40,000 ft. or higher) will continue from SW-NE, lower-level wind flow will continue from south to north. Ashfall continues to be much more likely from lower-level wind flow. Consequently, according to the latest Ash Trajectory Forecasts, any short-term future eruptions are likely to deposit measurable ash only in the Sustina Valley, sparing Anchorage, Palmer-Wasilla, and the Kenai Peninsula.

From The Alaska Standard, I've cross-embedded a video showing a USGS overflight of Mount Redoubt. The precise date and time is not provided, but it appears to have taken place either yesterday (March 26th) or today:

Here's a hilariously-titled post on Redoubt posted on TheObamaLegacy blog.

Continue to monitor the following sites for the most current information:

-- National Weather Service Redoubt Page
-- Alaska Volcano Observatory Redoubt Page
-- Latest NOAA Ash Trajectory Forecasts
-- Mt Redoubt Webcam #1 (Hut)
-- Mt Redoubt Webcam #2 (CI)
-- Webicorder Graph Output

And as for that skinny, puky, geeky Lousiana Governor Bobby Jindal, considering his state made such a cock-up of Katrina, perhaps he would be better off sticking to hurricane watching, and leave the volcano watching...and those of us who actually have volcanoes in our states.

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