You are viewing an obsolete version of the DU website which is no longer supported by the Administrators. Visit The New DU.
Democratic Underground Latest Greatest Lobby Journals Search Options Help Login
Google

Reply #2: MOUNT ST. HELENS UPDATE [View All]

Printer-friendly format Printer-friendly format
Printer-friendly format Email this thread to a friend
Printer-friendly format Bookmark this thread
This topic is archived.
Home » Discuss » Archives » General Discussion (01/01/06 through 01/22/2007) Donate to DU
Viva_La_Revolution Donating Member (1000+ posts) Send PM | Profile | Ignore Mon May-29-06 05:35 PM
Response to Original message
2. MOUNT ST. HELENS UPDATE
Monday, May 29, 2006 11:30 a.m. PDT (1830 UTC)

MOUNT ST. HELENS UPDATE

Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE: Growth of the new lava dome inside the crater of Mount St. Helens continues, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. During such eruptions, changes in the level of activity can occur over days to months. The eruption could intensify suddenly or with little warning and produce explosions that cause hazardous conditions within several miles of the crater and farther downwind. Small lahars could suddenly descend the Toutle River if triggered by heavy rain or by interaction of hot rocks with snow and ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard along the river channel upstream.


Potential ash hazards: Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that any ash clouds that rise above the crater rim today would drift east to southeastward early shifting to southeastward by afternoon.


Potential ash hazards to aviation: Under current eruptive conditions, small, short-lived explosions may produce ash clouds that exceed 30,000 feet in altitude. Ash from such events can travel 100 miles or more downwind.


Recent observations: At 9:08 a.m. PDT (1608 UTC) a large rockfall from the growing lava dome corresponded with a magnitude 3.1 earthquake, sending a flow of rock and dust from the new dome. Pilots reported a plume to 16,000 to 20,000 feet. Remote camera views from six minutes after the event showed mostly steam and minor ash plumes in the crater. There is no evidence of an explosion associated with this event. Events such as this are expected during lava dome growth. Weather permitting, scientists will be in the field later this week.

http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentAct...

Printer Friendly | Permalink |  | Top
 

Home » Discuss » Archives » General Discussion (01/01/06 through 01/22/2007) Donate to DU

Powered by DCForum+ Version 1.1 Copyright 1997-2002 DCScripts.com
Software has been extensively modified by the DU administrators


Important Notices: By participating on this discussion board, visitors agree to abide by the rules outlined on our Rules page. Messages posted on the Democratic Underground Discussion Forums are the opinions of the individuals who post them, and do not necessarily represent the opinions of Democratic Underground, LLC.

Home  |  Discussion Forums  |  Journals |  Store  |  Donate

About DU  |  Contact Us  |  Privacy Policy

Got a message for Democratic Underground? Click here to send us a message.

© 2001 - 2011 Democratic Underground, LLC