Dr. Jeff Masters' WunderBlog |
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| Posted by: Dr. Jeff Masters, 16:47 GMT le 15 novembre 2006 | +3 |


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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
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I looked at that. Doesn't really move Sward, does it? Interesting abt. the U level divergance, obviously a key player in the current severe threat. I guess we'd need to see a similar level of instability in the SW Car to have any development along the lines of the CMC forecast . . .
IM ABOUT TO BE SLAMED BY SUPER CELL TORNATIC
THUNDERSTORMS WITH ALREADY A REPORTING OF A FUNNEL CLOUD!
000
WTPZ41 KNHC 160235
TCDEP1
HURRICANE SERGIO DISCUSSION NUMBER 10
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP212006
700 PM PST WED NOV 15 2006
AFTER LOOKING VERY IMPRESSIVE EARLIER TODAY...SERGIO'S SATELLITE
PRESENTATION HAS DEGRADED RAPIDLY DURING THE LAST SEVERAL HOURS.
THE EYE IS NO LONGER PRESENT AND THE OVERALL CLOUD PATTERN HAS
BECOME INCREASINGLY ELONGATED SOUTHWEST TO NORTHEAST. IT IS
DIFFICULT TO KNOW WHETHER THIS IS A TEMPORARY FLUCTUATION OR THE
BEGINNING OF A LONGER-TERM WEAKENING TREND. THE INITIAL INTENSITY
IS CONSERVATIVELY SET AT 90 KT IN LINE WITH AN AVERAGE OF THE
AVAILABLE SUBJECTIVE DVORAK ESTIMATES. WATER VAPOR IMAGERY AND
UW-CIMSS SATELLITE DERIVED WINDS INDICATE THAT THE LARGE-SCALE
PATTERN DOES NOT APPEAR TO BE EVOLVING AS PREVIOUSLY SHOWN BY THE
GLOBAL MODELS. THE SHORTWAVE TROUGH DROPPING SOUTHWARD OVER THE
BAJA PENINSULA HAS NOT CLOSED OFF AND THE WEAK RIDGE HAS NOT YET
FORMED OVER MEXICO. INSTEAD...A LARGE TROUGH OVER THE CENTRAL
UNITED STATES EXTENDS ACROSS MEXICO INTO THE EASTERN PACIFIC. AS A
RESULT...STRONG WESTERLY SHEAR IS NOW BEARING DOWN ON THE
CYCLONE...AND MAY ALREADY BE AFFECTING IT. NONETHELESS...THE GFDL
MODEL CONTINUES TO SHOW SERGIO STRENGTHENING WHILE MOVING NORTHWARD
INTO THIS INCREASINGLY SHEARED ENVIRONMENT. SINCE ANY APPRECIABLE
NORTHWARD MOTION WOULD TAKE THE CYCLONE INTO A SEEMINGLY HOSTILE
ENVIRONMENT...THIS SOLUTION DOES NOT APPEAR TO BE THE MOST LIKELY
SCENARIO. INSTEAD...THE OFFICIAL FORECAST IS CLOSER TO THE FSU
SUPERENSEMBLE MODEL AND CALLS FOR NO ADDITIONAL STRENGTHENING
DURING THE NEXT 12-24 HOURS FOLLOWED BY WEAKENING AS THE CYCLONE
BEGINS TO ENCOUNTER EVEN STRONGER SHEAR AND A DRY/STABLE AIR
AIRMASS.
SERGIO HAS BEEN MOVING SLOWLY EASTWARD THIS EVENING WITH THE LAST
COUPLE OF SATELLITE IMAGES SUGGESTING A GRADUAL NORTHWARD TURN.
THE INITIAL MOTION ESTIMATE IS 060/4. AS MENTIONED ABOVE...THE
LARGE-SCALE STEERING PATTERN IS COMPLEX...RESULTING IN QUITE A BIT
OF SPREAD AMONG THE AVAILABLE TRACK MODELS. THE GUIDANCE ENVELOPE
IS FLANKED ON THE EAST SIDE BY THE GFDL AND NOGAPS MODELS WHICH
SHOW SERGIO CLIPPING THE SOUTHWESTERN COAST OF MEXICO.
CONVERSELY...THE GFS...ITS ENSEMBLE MEAN...AND NOW THE ECMWF MODEL
SHOW A MORE WESTWARD TRACK. THE OFFICIAL FORECAST ASSUMES THAT
SERGIO WILL GRADUALLY WEAKEN AND THUS TURN NORTHWEST IN LINE WITH
THE FSU SUPERENSEMBLE AND MEDIUM BAM MODEL. WHILE IT IS MUCH TOO
SOON TO SAY WHETHER SERGIO WILL OR WILL NOT AFFECT MEXICO...
INTERESTS ALONG THE SOUTHWESTERN COAST SHOULD MONITOR THE PROGRESS
OF THIS SYSTEM.
FOR THE HISTORICALLY CURIOUS...SERGIO IS THE STRONGEST EASTERN NORTH
PACIFIC BASIN HURRICANE ON RECORD FOR SO LATE IN THE SEASON.
FORECAST POSITIONS AND MAX WINDS
INITIAL 16/0300Z 12.3N 103.2W 90 KT
12HR VT 16/1200Z 12.7N 103.1W 90 KT
24HR VT 17/0000Z 13.7N 103.3W 90 KT
36HR VT 17/1200Z 14.6N 103.8W 85 KT
48HR VT 18/0000Z 15.9N 104.9W 75 KT
72HR VT 19/0000Z 18.0N 106.5W 65 KT
96HR VT 20/0000Z 19.5N 107.5W 55 KT
120HR VT 21/0000Z 21.0N 109.0W 45 KT
$$
FORECASTER RHOME
you do realize that the trough disrupting Sergio is the same one driving the severe weather in the SE US. So in a way, GA / FL etc. are seeing some of Sergio tonight......
Earthquake
Winds were sustained at 50mph in Hillsborough County.
Per CNN.." The Associated Press quoted officials saying as many as nine people died."....from todays tornadoes.
urgent - immediate broadcast requested
Tornado Watch number 868
NWS Storm Prediction Center Norman OK
1045 am EST Thu Nov 16 2006
The NWS Storm Prediction Center has issued a
Tornado Watch for portions of
District of Columbia
Delaware
much of Maryland
eastern North Carolina
southern and central New Jersey
southeast Pennsylvania
much of eastern Virginia
coastal waters
Effective this Thursday morning and evening from 1045 am until
600 PM EST.
Tornadoes... hail to 1.5 inches in diameter... thunderstorm wind
gusts to 80 mph... and dangerous lightning are possible in these
areas.
THE ATLANTIC OCEAN...
THE ENERGY FROM THE DEEP LAYER TROUGH MOVING THROUGH THE CENTRAL
GULF WATERS INTO THE SOUTHEASTERN U.S.A. IS SET TO HELP TO
RE-ENERGIZE THE ALREADY EXISTING WESTERN ATLANTIC OCEAN TROUGH.
THE COLD FRONT WHICH NOW IS MOVING THROUGH THE GULF OF MEXICO IS
FORECAST TO MOVE THROUGH FLORIDA COMPLETELY DURING THE NEXT
24 HOURS. GET READY FOR THE FRONT TO HIT THE ATLANTIC OCEAN AT
THAT TIME. THE ORGANIZED MIDDLE TO UPPER LEVEL CYCLONIC
CIRCULATION CENTER IN THE CENTRAL ATLANTIC OCEAN HAS BECOME
STRUNG OUT WITH MULTIPLE CYCLONIC CENTERS FROM 28N TO 33N
BETWEEN 40W AND 60W.
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