Dr. Jeff Masters' WunderBlog |
|
| Posted by: Dr. Jeff Masters, 1:41 PM GMT on April 23, 2010 | +1 |



| Permalink | A A A |
|
|
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
|
Tropical Blogs
Tropical Weather Stickers®
Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 — Blog Index
Climate effects on volcanism: Influence on magmatic systems of loading and unloading from ice mass variations, with examples from Iceland
Freysteinn Sigmundsson*, Virginie Pinel, Björn Lund, Fabien Albino, Carolina Pagli, Halldór Geirsson, and Erik Sturkell
Abstract
Pressure influences both magma production and the failure of magma chambers. Changes in pressure interact with the local tectonic settings and can affect magmatic activity. Present-day reduction in ice load on subglacial volcanoes due to global warming is modifying pressure conditions in magmatic systems. The large pulse in volcanic production at the end of the last glaciation in Iceland suggests a link between unloading and volcanism, and models of that process can help to evaluate future scenarios. A viscoelastic model of glacio-isostatic adjustment that considers melt generation demonstrates how surface unloading may lead to a pulse in magmatic activity. Iceland’s ice caps have been thinning since 1890 and glacial rebound at rates exceeding 20 mm yr−1 is ongoing. Modelling predicts a significant amount of ‘additional’ magma generation under Iceland due to ice retreat. The unloading also influences stress conditions in shallow magma chambers, modifying their failure conditions in a manner that depends critically on ice retreat, the shape and depth of magma chambers as well as the compressibility of the magma. An annual cycle of land elevation in Iceland, due to seasonal variation of ice mass, indicates an annual modulation of failure conditions in subglacial magma chambers.
*Correspondence e-mail: fs@hi.is
Link to abstract: http://rsta.royalsocietypublishing.org/content/368/1919/2535.abstract
2.20" rain in Georgetown Guyana today so far. Lots of moisture to the south. Models call for a northward lift of the ITCZ.
But here in Trini., it sure does not feel like there is any rain coming soon.
Thank you Levi for being so reassuring ;)
So yes in severe weather pressure is a factor in the building of those cold cloud tops as the temperature needed for the air to saturate is lower.
Same here in sint maarten... dry dry and dry lol
That was the simplified version.
I love watching Severe Weather Outbreaks, especially when they happen far from populated areas.
My concern is that as the ULL moves eastward, the storms are going to crank up big-time. moving into populated areas at night.
Folks please watch out for crazy weather in the SE and Mid-South.
Please keep the complete version to yourself, then.
LOL
Tornado Warning
TORNADO WARNING
MSC015-019-097-105-155-232300-
/O.NEW.KJAN.TO.W.0010.100423T2201Z-100423T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
501 PM CDT FRI APR 23 2010
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
* TORNADO WARNING FOR...
NORTHERN CHOCTAW COUNTY IN CENTRAL MISSISSIPPI...
SOUTHEASTERN CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
SOUTHERN MONTGOMERY COUNTY IN NORTH CENTRAL MISSISSIPPI...
WEBSTER COUNTY IN NORTH CENTRAL MISSISSIPPI...
NORTHWESTERN OKTIBBEHA COUNTY IN NORTHEAST MISSISSIPPI...
* UNTIL 600 PM CDT
* AT 501 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR VAIDEN
MOVING NORTHEAST AT 55 MPH.
* THE TORNADO WILL BE NEAR...
KILMICHAEL AND POPLAR CREEK BY 510 PM CDT...
LODI BY 515 PM CDT...
EUPORA...BELLEFONTAINE AND EMBRY BY 530 PM CDT...
SHERWOOD AND REFORM BY 535 PM CDT...
MATHISTON AND MABEN BY 540 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FRIDAY EVENING FOR
MISSISSIPPI.
&&
LAT...LON 3357 8901 3357 8891 3346 8887 3329 8956
3329 8969 3324 8974 3341 8983 3373 8925
3373 8919 3375 8918 3374 8902
TIME...MOT...LOC 2201Z 245DEG 48KT 3337 8969
$$
they said they could upgrade too high risk
Not even May and it's already starting up! Lol.
Sunday
Partly cloudy. A 20 percent chance of showers in the morning. Highs in the upper 70s. Southwest winds 5 to 15 mph shifting to the west 15 to 20 mph in the afternoon.
MESOSCALE DISCUSSION 0353
NWS STORM PREDICTION CENTER NORMAN OK
0528 PM CDT FRI APR 23 2010
AREAS AFFECTED...PARTS OF CENTRAL/NERN TX...FAR SERN OK...NWRN LA
AND SWRN AR
CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY
VALID 232228Z - 232300Z
CORRECTED FOR TYPO IN SECOND SENTENCE /NW SHOULD BE NWD/
NEW TORNADO WATCH WILL BE COORDINATED SOON FOR PARTS OF CENTRAL/
NERN TX INTO THE ARKLATEX REGION.
FORCING FOR ASCENT AND ATTENDANT STORMS THAT RESULTED IN THE NEED
FOR A TORNADO WATCH EARLIER TODAY HAS MOVED NW AND EWD WHICH ALLOWED
WW 79 TO EXPIRE AT 22Z.
MEANWHILE...STRONG TO SEVERE STORMS ARE DEVELOPING ACROSS PART OF
CENTRAL TX /20 SSW TPL-40 SE ACT/. THE ENVIRONMENT FROM VICINITY OF
THESE STORMS INTO THE ARKLATEX IS WARM AND VERY MOIST WITH MLCAPE
2000-2500 J/KG. WATER VAPOR IMAGERY INDICATED THIS AREA IS BEING
GLANCED BY THE SRN EXTENT OF AN ELONGATED VORTICITY LOBE NOW MOVING
INTO THE LOWER MO VALLEY...WHILE IMAGERY ALSO SHOWED A SPEED MAX
TRACKING FROM THE LOWER RIO GRANDE VALLEY INTO E TX. ALTHOUGH LOW
LEVEL CONVERGENCE IS SOMEWHAT WEAK ALONG A SW-NE ORIENTED SURFACE
BOUNDARY EXTENDING NEWD FROM DRT TO THE ARKLATEX...BOTH UPPER
FEATURES SHOULD SUPPORT ADDITIONAL STORM DEVELOPMENT INTO THE
EVENING. GIVEN DEGREE OF INSTABILITY AND INCREASING FLOW ALOFT
AHEAD OF MAIN UPSTREAM SHORTWAVE TROUGH MAINTAINING STRONG DEEP
LAYER SHEAR...SUPERCELLS WILL BE LIKELY.
..PETERS.. 04/23/2010
TORNADO WATCH OUTLINE UPDATE FOR WT 82
NWS STORM PREDICTION CENTER NORMAN OK
540 PM CDT FRI APR 23 2010
TORNADO WATCH 82 IS IN EFFECT UNTIL 200 AM CDT FOR THE
FOLLOWING LOCATIONS
ARC057-061-073-081-091-099-133-240700-
/O.NEW.KWNS.TO.A.0082.100423T2240Z-100424T0700Z/
AR
. ARKANSAS COUNTIES INCLUDED ARE
HEMPSTEAD HOWARD LAFAYETTE
LITTLE RIVER MILLER NEVADA
SEVIER
LAC015-017-240700-
/O.NEW.KWNS.TO.A.0082.100423T2240Z-100424T0700Z/
LA
. LOUISIANA PARISHES INCLUDED ARE
BOSSIER CADDO
OKC089-240700-
/O.NEW.KWNS.TO.A.0082.100423T2240Z-100424T0700Z/
OK
. OKLAHOMA COUNTIES INCLUDED ARE
MCCURTAIN
TXC001-027-037-041-051-063-067-073-119-145-159-161-183-185-203-
213-223-225-277-289-293-309-313-315-331-343-347-349-365-379-387-
395-401-423-449-455-459-467-471-499-240700-
/O.NEW.KWNS.TO.A.0082.100423T2240Z-100424T0700Z/
TX
. TEXAS COUNTIES INCLUDED ARE
ANDERSON BELL BOWIE
BRAZOS BURLESON CAMP
CASS CHEROKEE DELTA
FALLS FRANKLIN FREESTONE
GREGG GRIMES HARRISON
HENDERSON HOPKINS HOUSTON
LAMAR LEON LIMESTONE
MADISON MARION MCLENNAN
MILAM MORRIS NACOGDOCHES
NAVARRO PANOLA RAINS
RED RIVER ROBERTSON RUSK
SMITH TITUS TRINITY
UPSHUR VAN ZANDT WALKER
WOOD
ATTN...WFO...SHV...HGX...FWD...
This is a rarity in the Cayman Islands.
Twister hits Little Cayman
Posted on Mon, 04/19/2010 - 07:09 in Science and Nature
(CNS): Updated 10:45 am -- Eyewitnesses on Little Cayman say there is some damage to Lighthouse Point condos on the western tip of Little Cayman after a tornado hit the island yesterday evening. Reports suggest that there is little damage to the exterior of the affected buildings but several ceilings caved in. Hazard Management Cayman Islands has confirmed that a little after 7pm yesterday evening (Sunday 18 April) a tornado came ashore on the west side of Little Cayman close to Lighthouse Point.
Director of National Weather Service Fred Sambula confirmed the incident. “There was an area of thunderstorms with strong convection in the general area of the Sister Islands, but in the absence of Doppler radar, it is impossible to confirm exactly what occurred. We know that areas of strong convection can produce micro bursts and spin ups that are usually short lived and very localized, however it is also possible to get a strong burst of wind during squally conditions," he said.
The condos in question are said to belong to local businessman Robert Hamaty and damage was also reported at Valda and Jonny Scott"s property.
HMCI said while it was unable to confirm that the property damage in Little Cayman was actually caused by a tornado, it is not unusual to see waterspouts in the nearshore waters and open waters of the Cayman Islands, but they rarely come ashore. Hazard management warned residents to take waterspouts seriously. “If you are a boater or a person living along the coast you should be aware of their destructive potential. When warnings are issued for waterspouts, be prepared to quickly seek safe harbor, or to find shelter out of the path of the waterspout,” a spokesperson said. .
The tornado comes less than twenty-four hours after two small earthquakes occurred off the coast of Grand Cayman.
Ah, an early start to your rainy season! That may be a blessing in disguise.
Any further word from Cyclone Oz?
check it out!
link
Live video chat by Ustream
will do!
thanks
The stronger water cycle means arid regions have become drier and high rainfall regions wetter as atmospheric temperature increases.
The study, co-authored by CSIRO scientists Paul Durack and Dr Susan Wijffels, shows the surface ocean beneath rainfall-dominated regions has freshened, whereas ocean regions dominated by evaporation are saltier. The paper also confirms that surface warming of the world's oceans over the past 50 years has penetrated into the oceans' interior changing deep-ocean salinity patterns.
"This is further confirmation from the global ocean that the Earth's water cycle has accelerated," says Mr Durack – a PhD student at the joint CSIRO/University of Tasmania, Quantitative Marine Science program. more here
Nah, that storm near him isn't that bad, yet!
The ULL is moving toward SW TX, this will liven up later this evening into tomorrow!
The incoming storm appears to be getting its act together, and may become severe anytime now, with the possibility for hail, and even a tornado.
Yea, he needs to go SE. You have to stay inside the outflow - unfortunatley I don't think he has access to Level 2 data
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
730 PM CDT FRI APR 23 2010
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
* TORNADO WARNING FOR...
EASTERN CASS COUNTY IN NORTHEAST TEXAS...
THIS INCLUDES THE CITY OF ATLANTA...
SOUTHWESTERN LAFAYETTE COUNTY IN SOUTHWEST ARKANSAS...
SOUTHERN MILLER COUNTY IN SOUTHWEST ARKANSAS...
* UNTIL 815 PM CDT
* AT 730 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ATLANTA...
MOVING EAST AT 40 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO QUEEN
CITY...RAVANNA...BRIGHTSTAR...DODDRIDGE AND FOUKE...
he is heading se on highway 82, into arkansas to intercept the storm
Viewing: 301 - 351
Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 — Blog Index