Dr. Jeff Masters' WunderBlog |
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| Posted by: Dr. Jeff Masters, 3:05 PM GMT on February 24, 2010 | +4 |



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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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True...this from this mornings Melbourne discussion....
"A MORE SIGNIFICANT STORM SYSTEM IS PROGGED BY ECMWF TO AFFECT THE
AREA AROUND TUESDAY. THIS SYSTEM LOOKS TO HAVE QUITE A BIT OF
UPPER SUPPORT AND STRONG WIND FIELDS. HAVE MAINTAINED 40% POPS TUE
AND ADDED THUNDER TO ALL AREAS. THIS SYSTEM MAY HAVE THE POTENTIAL
TO PRODUCE STRONG TO SEVERE STORMS ACROSS PORTIONS OF CENTRAL FL
IF SUFFICIENT INSTABILITY CAN RETURN. AFTER BEING IN GOOD
AGREEMENT WITH THE ECMWF LAST NIGHT...THE 00Z GFS IS NOW DEPICTING
A VERY DIFFERENT SCENARIO WITH LOW PRESSURE TRACKING WELL TO
THE SOUTH ACROSS CUBA. WE`LL SEE IF THE GFS HAS LATCHED ONTO
SOMETHING BUT THIS LACK OF CONSISTENCY REDUCES CONFIDENCE IN THE
MODEL SO LEANED HEAVILY ON THE MORE CONSISTENT ECMWF IN THE
EXTENDED RANGE. EXPECT BOTH MODELS TO COME INTO BETTER AGREEMENT
EVENTUALLY...HOPEFULLY SOONER THAN LATER."
The inconsistency of the GFS is puzzling me. Does the ECMWF solution support the same cold temps the GFS supported?
GFS was having problems like this a couple of weeks ago....was discounted and finally came around to the other models.
From the Tallahassee morning discussion....
"THE 00Z GFS AND EURO BOTH KEEP US ON THE COLD SIDE OF THIS STORM.
NOW...THE LATEST GFS RUN IS EVEN FURTHER SOUTH THAN PRE RUN AND WELL
SOUTH OF ECMWF..SO IT BACKS OFF FURTHER ON LOCAL IMPACTS.
CONVERSELY...THE EURO WHICH BRINGS THE LOW FURTHER TO THE NORTH WITH
THE NRN FRINGES APPROACHING OUR COASTAL WATERS ALSO HAS A MUCH
LARGER MOISTURE FIELD WRAPPING AROUND THE BACKSIDE OF THE SYSTEM
INTO WED MORNING. PARTIAL THICKNESS AND 850MB TEMP ANALYSIS SUGGEST
A BRIEF WINTRY MIX POSSIBLE BUT BOUNDARY LAYER STILL A TAD TOO WARM
TO SUPPORT SNOW ALTHO THIS NEEDS TO BE MONITORED CLOSELY AS WE
APPROACH EVENT. IF THE EURO VERIFIES...THIS IS A MORE POTENT STORM
SYSTEM THAN THE GULF LOW THAT CROSSED ON SAT WITH A MID LEVEL TROUGH
DIGGING THROUGH THE SOUTHEAST AND A RATHER IMPRESSIVE UPPER LEVEL
JET MOVING THROUGH THE PENINSULA. IT ALSO WOULD LEAD TO LOCALLY
HEAVIER PRECIPITATION AMOUNTS (RIVER RISES) AND VERY TIGHT GRADIENTS
BETWEEN GULF LOW TO OUR SOUTH...AND HIGH TO OUR NORTH. IF CONDS
BECOME MORE FAVORABLE FOR WINTRY PRECIP...THIS COULD YIELD SHARP
CHANGE IN PRECIP TYPE OVER SHORT DISTANCES AS WELL AS BRISK AND
GUSTY WINDS WITH POSSIBLY GALE FORCE WINDS OVER THE WATER. AGAIN
INCONSISTENCY WITH MODELS LEADS ME TO SHY AWAY FROM SOLID PRECIP AT
THIS TIME. AFTER THE LOW LIFTS NEWD BY BY TUES AFTN...STRONG HIGH
PRESSURE BUILDS IN WITH A DRY AND COOL AIRMASS DOMINATED THE NE GULF
TUES EVE THRU THURS.
WILL SHOW SCT POPS WITH SW-NE GRADIENT MON NIGHT THRU TUES AFTN
OTHERWISE NIL POPS. THIS IS CLOSER TO ECMWF POPS AS OPPOSED TO GFS
WHICH SHOWS WDLY SCT-LO SCT POPS. LOCAL AREA WILL REMAIN NORTH OF
BOTH GULF LOWS (ENTRENCHED IN COOL SECTOR) MON INTO TUES...
OTHERWISE DOMINATED BY STRONG HIGHS BUILDING IN...COLD AIR ADVECTION
AND CP AIRMASS OUTBREAKS. THUS...TEMPS WILL REMAIN BELOW CLIMO THRU
PERIOD. INLAND CLIMO IS MIN TEMPS IN LOW-MID 40S AND MAX TEMPS
AROUND 70. SAT NIGHT WILL BE THE COLDEST WITH MINS AROUND 30 DEGREES
YIELDING A LIGHT FREEZE WITH COLDEST MINS REMAINING IN THE MID 30S
THRU THE PERIOD. INLAND MAX TEMPS IN THE LOW-MID 60S...EXCEPT AROUND
60 NRN TIER OF SE ALA/SW GA."
Think someone said it had a SEG error? Something to do with the sequential...or exponental..
ahh but yeah, me thinks GFS has got a screw loose.
ATTENDANT SURFACE LOW TRACKS ACRS THE GULF OF MEX AT SAME TIME.
GFS HAS BEEN TRENDING FARTHER SOUTH WITH THE SFC LOW NOW CROSSING
THE FL STRAITS. THE ECMWF TRACKS THE LOW ACRS N FL ON TUESDAY
WHILE THE CANADIAN AND GFS ENSEMBLE TREND SOMEWHERE IN BETWEEN.
It's global warmings fault.
We used to laugh at the CMC...now it's the GFS that looks like it might need a week in rehab.
Ya'll have a blessed day- peace!
L8R.
Down to 30.4.
Enjoying snow in nyc!
The Gulf Stream continues to be diverted west-southwestwards due to the cold water intrusion to its north. The <20C zone of the Humboldt is now pointed north-northeastward, hugging the coast and meeting head-on with an area above 26C in northern Chile.
Link
I live in your area too aquak what does this mean?
but no snow in north central florida right? or is it just rain and wind.
"A SIGNIFICANT FACTOR INFLUENCING THE TRACK OF THE APPROACHING
MID/UPPER WAVE WILL BE A BROAD AND DEEP CUT-OFF CYCLONIC CIRCULATION
CENTERED OVER THE NORTHEAST CONUS. THROUGH SUNDAY...THIS FEATURE IS
FORECAST TO REMAIN VERTICALLY-STACKED AND ASSOCIATED WITH AN INTENSE
SURFACE LOW HAVING A MEAN CENTER OVER SOUTHEAST NEW YORK. GOING INTO
LATE SUNDAY AND MONDAY...THE ECMWF...NOGAPS...CMC...NEARLY EVERY
MEMBER OF THE CMC ENSEMBLES...AND A HANDFUL OF THE MEMBERS OF THE
GEFS ALL KICK THE DEEP-LAYER CYCLONE OFF THE EAST COAST...MAKING WAY
FOR THE SOUTH CENTRAL CONUS DISTURBANCE TO TAKE AN EASTWARD
TRAJECTORY WITH THE STRONGEST ASCENT PASSING ACROSS THE LOWER
MISSISSIPPI RIVER VALLEY AND NORTHERN GULF FROM MONDAY AFTERNOON
INTO TUESDAY.
WHAT THE GFS AND SOME OF THE GFS ENSEMBLE MEMBERS DO WITH THESE
FEATURES IS RATHER QUESTIONABLE. THESE MODELS ENTIRELY DECOUPLE THE
NORTHEAST CONUS CYCLONE...WITH THE INTENSE SURFACE LOW MERGING WITH A
NORTHEASTWARD-RACING CYCLONE OVER THE WESTERN NORTH ATLANTIC THUS
ALLOWING THE MID/UPPER LEVEL CIRCULATION TO LAG BEHIND OVER INLAND
AREAS. GIVEN THE WESTWARD DISPLACEMENT OF THE MID/UPPER CYCLONE IN
THE GFS/GEFS...THE SOUTH CENTRAL CONUS DISTURBANCE WOULD BE
SUPPRESSED SUBSTANTIALLY TO THE SOUTH...WITH THE OPERATIONAL GFS
INDICATING THE GREATEST SUPPRESSION. THIS SUPPRESSION WOULD BE
FURTHER ENHANCED BY SHORTWAVE ENERGY FORECAST TO DIVE SOUTHWARD AT
THE WESTERN PERIPHERY OF THE NORTHEAST CONUS CIRCULATION. THE
AFOREMENTIONED DECOUPLING AND WESTWARD LAG EVIDENT IN THE GFS/GEFS
HAS LITTLE BACKING FROM ANY OTHER GUIDANCE...AND THE PHYSICAL
JUSTIFICATION FOR THIS DECOUPLING IS QUESTIONABLE GIVEN LACK OF
STRONG DEEP-LAYER SHEAR ACTING ON THE LARGE-SCALE CIRCULATION AND ITS
ANTECEDENT WELL-DEVELOPED VERTICAL STRUCTURE.
THUS...THIS FORECAST PACKAGE WILL DISCOUNT THE GUIDANCE WHICH
SUPPRESSES THE SOUTH CENTRAL CONUS DISTURBANCE TO THE SOUTH BY A
LAGGING MID/UPPER CYCLONE OVER THE NORTHEAST CONUS...AND WILL FOLLOW A
BLEND OF THE ECMWF/CMC/CMC ENSEMBLES. AS THE SHORTWAVE APPROACHES
THE SOUTHEAST CONUS LATE SUNDAY INTO MONDAY...A SURFACE LOW IS
FORECAST TO DEVELOP OVER SOUTH TEXAS AND THEN TRACK EASTWARD ACROSS
THE NORTHERN GULF ALONG 27N/28N. THE ECMWF SHOWS A MINIMUM CENTRAL
PRESSURE FALL OF 5 MB IN 6 HOURS BETWEEN 00Z AND 06Z ON
TUESDAY...AND THIS SEEMS ENTIRELY PLAUSIBLE GIVEN THE STRENGTH OF
Q-VECTOR CONVERGENCE DOWNSTREAM OF THE MID/UPPER TROUGH AXIS.
INTERESTINGLY...BECAUSE THE GFS SUPPRESSES THE UPPER WAVE SO FAR
SOUTH...ITS ATTENDANT SURFACE LOW FOLLOWS A TRACK FROM THE YUCATAN
PENINSULA ACROSS THE YUCATAN CHANNEL TO WESTERN CUBA. THIS SOLUTION
IS CERTAINLY AN OUTLIER...AND MOST OF THE GEFS MEMBERS SHOW A TRACK
MUCH FURTHER TO THE NORTH WITH A CLUSTER ALONG 26N.
SINCE THE PRECIP FORECAST WILL BE TIED TO THE TRACK OF THE
SURFACE LOW...THE GFS IS INDICATING NO PRECIP ACROSS THE ARKLAMISS
REGION WITH VERY LOW POPS FROM MEX GUIDANCE...AND THESE SOLUTIONS
ARE BEING DISCOUNTED WITH FORECAST POPS RAISED WELL ABOVE MEX
GUIDANCE. FOLLOWING A BLEND OF THE ECMWF/CMC/CMC ENSEMBLES...PRECIP
WILL OVERSPREAD THE REGION MONDAY AND CONTINUE INTO MONDAY NIGHT AND
EARLY TUESDAY MORNING. THERMAL PROFILES WILL BE FAVORABLE FOR SNOW TO
MIX IN ACROSS THE NORTHERN THIRD OF THE CWA FOR MONDAY NIGHT...WHEN
THE ECMWF IS INDICATING WET-BULB ZERO (WBZ) HEIGHTS BELOW 1500 FT.
HOWEVER...STRONG ADIABATIC COOLING DUE TO FORCED ASCENT AND MELTING
PROCESSES ALOFT COULD COOL THE LOWER/MID TROPOSPHERE EVEN MORE.
OR...THE LOW COULD TRACK A LITTLE FURTHER TO THE SOUTH GIVING A
LARGER PART OF THE AREA LOWER WBZ HEIGHTS. IN THESE CASES...SNOW
WOULD BECOME A MORE PREDOMINANT PRECIP TYPE. AND IF THIS
OCCURS...STRONG ASCENT THROUGHOUT SATURATED AND DEEP DENDRITIC GROWTH
ZONES APPROACHING 100 MB THICK WOULD BE VERY SUPPORTIVE OF HEAVY
SNOW. THERE WILL ALSO BE CONCERN FOR STRONG GRADIENT WINDS IN THE
NORTHERN SEMICIRCLE OF THE LOW. HOWEVER...A LOW TRACK TO THE NORTH
WOULD RESULT IN WARMER THERMAL PROFILES AND MOSTLY RAIN.
ULTIMATELY...A LOT CAN CHANGE WITH REGARD TO THE CHARACTERISTICS OF
THE AFOREMENTIONED SYNOPTIC FEATURES IN THE NEXT SEVERAL DAYS...BUT
THE POTENTIAL IS THERE FOR A SIGNIFICANT STORM SYSTEM TO AFFECT THE
AREA EARLY NEXT WEEK. GIVEN HIGH UNCERTAINTY IN THE NATURE OF THE
POTENTIAL HAZARDS...MENTION IS BEING WITHHELD FROM THE HAZARDOUS
WEATHER OUTLOOK FOR NOW."
thanks!
Hi Aussie, Got in on this a little late. I think your interpretation is the right one. Many Canadians bear significant animosity toward Americans. To many Canadians, America is the proverbial 800 pound gorilla. From the Canadian perspective, America is large, noisy, and overbearing. Worse than that, it generally ignores Canada and is ignorant of Canadian history, culture, politics, etc. (Just think about recent health reform arguments in US, with people being terrified about the possibility of adopting a 'socialist' Canadian system.) The combination of perceived boorishness and ignorance on the part of their American neighbors makes it less likely that the Canadians will cheer for the US against a supposedly more 'civilized' rival.
AOI
AOI
AOI
AOI
Humor in Comments
This from the AP
The National Weather Service criticized State College, Pa.-based Accuweather Inc. for referring to the storm that way and for saying it would be "hurricane-like" and a "monster." NWS meteorologist Craig Evanego said the terminology was "almost inciting the public, inciting panic."
I hate to admit it... but you nailed it perfectly.
Thanks. But as long as we would rather be proud of being a 'stupid American' than be diligent about being responsibly informed, I see little likelihood of change - in either direction.
Here is a link you might enjoy... this is from the news coverage at the start of the Olympics.
Tom Brokaw Explains Canada To Americans
Morning Storm... tell me this year is going to be a bit more active.. this blog will not survive another slow year like the last one... it will self implode.
Daytona Beach (Ponce Inlet), FL, Daytona Beach, Florida (PWS)
Updated: 1 sec ago
44.6 °F
Clear Windchill: 41 °F Humidity: 65%
Dew Point: 34 °F Wind: 7.0 mphfrom the WNW
Wind Gust: 7.0 mph Pressure: 30.04 in (Rising)
All clear on the western front for now.
The Superstorm is starting for people up north, power outages, road closers, and many more as a possible 975 mlb. low (possibly lower) busts into Long Island, which will calm down winds for them since they will be under the center for most of the time. The 1993 Superstorm was down to 960 mlb. This is a life-threatening storm. My prayers go out to everybody in this historic storm. Would not surprise me that the low bombs down to 970 or below. INteresting storm for weather people like me.
In a morbid way, thank god I guess.. hopefully lots of open ocean storms to watch and chat about... not some of the other choice subjects like last year.
I loved that! See my comments on your blog.
I think it's in the southern bit, as I seem to remember that Andalusia (on the Spanish side) has had so far a very wet winter with significant flooding and local services disruption. However, here in Catalonia (around Barcelona and the Pyrenees)we are now having a great taste of Spring weather after the wintry weather we have had recently...STILL, no news of big winter storm hitting Europe over here!!
I think it's in the southern bit, as I seem to remember that Andalusia (on the Spanish side) has had so far a very wet winter with significant flooding and local services disruption. However, here in Catalonia (around Barcelona and the Pyrenees)we are now having a great taste of Spring weather after the wintry weather we have had recently...STILL, no news of big winter storm hitting Europe over here!!
Didn't they already identify this change? Check out this link.
"The effects of aerosols in brown clouds are particularly insidious because they seem to have the opposite effect of greenhouse gases. “By sheer, dumb luck, we are adding particles that are trapping sunlight and cooling the planet,” Ramanathan says, but these particles only mask global warming without eliminating it. A sudden drop in global air pollution would be like removing the mask, he explains, and the climate may play catch-up to compensate. “Many of us, including myself, are concerned we could see a huge acceleration of global warming if we unmask the beast.” Yet ignoring air pollution is not the solution either, as studies clearly show its serious health effects, he says. “Air pollution has to be reduced, if not eliminated. It's just a Faustian bargain we have made without realizing it.”
I believe the use and elimination of aerosols resulted in the unmasking which the writer mentions.
I'm in NYC.
Four inches already. The snow is heavy enough to make it extremely difficult to get around. Worse, ice is now packed under it, as the temperature gets cold enough to freeze the first few coats of rain and snow.
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