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January Pattern and Storm Discussion II


Cold Rain

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Guys... I know it's a week away but this at least holds some promise. What do you say we start its own thread? 

 

Hold on, Steve.  We must first determine whether the skies will have enough time to heal between today and next weekend?  Anybody know the incubation period for an ice storm illness?  I'd hate to start a thread on an event if the skies will be too sick to even participate next weekend.  We need an expert on cloud medicine.  Are there homeopathic remedies or do we have paid professionals that must administer aid?

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Might be but this fits into the thoughts about the GWO from QVectorman exactly. A couple of weeks ago he predicted that Jan 30 - Feb 2 we'd have a really good shot of cold air and possibly other things.  So far I don't think he's been wrong.

 

I don't know about these rules "starting a new thread" for a storm thing.  I'm too much of a lurker/newbie.  Your world, frightens and confuses me.  I'm just a newbie.  With that said I don't believe in jinxes so whatever's fine with me.  It may be nice to wait another run to see if it's still there. 

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Actually, the GFS has changed its tune somewhat vs the 00z.  You can see hints of a storm...granted it's nothing like the EURO but it's a BIG step in the right direction.

 

Something is a brew'n!!  

will the cold air be in place next weekend if the models do latch on to something for next weekend.  would love to see a big snow, but no ice like today.

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Just at a quick glance it appears as if the American model at 500 mb has moved toward the euro. Furthermore, the GFS model sees a ton of potential moving forward into February

It looks like our long lost friend the STJ finally wants to make an appearance. This goes well with phases 1-3 of the MJO. "Fab Feb" here we come!

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You can definitely see the GFS wants to.... almost does..... cut off the tail end of that trough like the Euro does. It's close to doing so. This reminds me so much of the modeling leading up to last week's event. You think it's the known Euro bias of holding energy back in the SW (and it could very well be this time), and then nope....turns out to be right. 

post-390-0-93963000-1359133377_thumb.png

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You can definitely see the GFS wants to.... almost does..... cut off the tail end of that trough like the Euro does. It's close to doing so. This reminds me so much of the modeling leading up to last week's event. You think it's the known Euro bias of holding energy back in the SW (and it could very well be this time), and then nope....turns out to be right. 

attachicon.gifGFS.png

Great point!  It acts like it realllllly wants too

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You can definitely see the GFS wants to.... almost does..... cut off the tail end of that trough like the Euro does. It's close to doing so. This reminds me so much of the modeling leading up to last week's event. You think it's the known Euro bias of holding energy back in the SW (and it could very well be this time), and then nope....turns out to be right. 

attachicon.gifGFS.png

Ensembles valid same time.12zgfsensembles500mbHeightAnomalyNA084.g

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Actually, the GFS has changed its tune somewhat vs the 00z.  You can see hints of a storm...granted it's nothing like the EURO but it's a BIG step in the right direction.

 

Something is a brew'n!!  

 It had a big dog a couple days ago since it goes out to 15. So it's not like the euro is on another planet. It's eye catching that this is 2 runs in a row with the euro showing something pretty significant for the this time frame.

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EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

1049 AM EST FRI JAN 25 2013

VALID 12Z MON JAN 28 2013 - 12Z FRI FEB 01 2013

CONFIDENCE IN THE MEDIUM RANGE FCST REMAINS BELOW AVERAGE AS

MODELS/ENSEMBLES CONTINUE TO SHOW DIVERGING IDEAS FOR HOW MUCH

FLOW SEPARATION WILL OCCUR WITHIN THE INITIAL WRN CONUS TROF.

ADDING TO THE UNCERTAINTY OF THE FCST BY THE LATTER HALF OF THE

FCST PERIOD IS SOME SPREAD IN THE HANDLING OF NRN STREAM ENERGY

WITHIN THE BROAD/AMPLIFIED MEAN TROF EXPECTED TO REACH THE ERN

HALF OF NOAM. IN LIGHT OF THE CURRENT ARRAY OF SOLNS AND A HINT

OF THE 00Z GEFS/ECMWF ENSEMBLE MEANS TRENDING TOWARD EACH OTHER

VERSUS THEIR 12Z/24 RUNS... PREFER A BLEND OF THOSE TWO 00Z MEANS

IN ORDER TO MAINTAIN THE BEST CONTINUITY POSSIBLE WHILE AWAITING

BETTER GUIDANCE CLUSTERING.

FROM THE LARGE SCALE PERSPECTIVE THE QUESTION IS HOW LONG THE ERN

PAC RIDGE STAYS STRONG ENOUGH TO SUPPORT SOME SWWD ELONGATION OF

WRN CONUS FLOW AS SHOWN TO SOME DEGREE IN TELECONNECTIONS... ON

THE WAY TOWARD MEANS SUGGESTING NEG HGT ANOMALIES CENTERED OVER

SERN CANADA/NEW ENGLAND PSBLY BECOMING A LITTLE MORE DOMINANT BY

LATE NEXT WEEK/WEEKEND. BASED ON TELECONS THE DIFFERENCE IN

EMPHASIS OF THESE TWO FEATURES TRANSLATES TO THE LARGEST SPREAD IN

PCPN POTENTIAL OVER THE SERN THIRD OF THE CONUS... WITH THE

STRONGER EPAC RIDGE SUPPORTING MSTR OVER THE SRN TIER VERSUS DRY

CONDS WITH A MORE DOMINANT ERN NOAM TROF. ULTIMATELY SOME ACCOUNT

FOR EITHER SCENARIO IS RECOMMENDED AT THIS TIME. THE 00Z AND TO

SOME EXTENT 06Z GEFS MEANS SHOW MORE SWWD ELONGATION OF ENERGY

THAN THE 12Z RUN... WHILE THE 00Z ECMWF MEAN HAS TRENDED AWAY A

FRACTION FROM THE 12Z RUN WITH THE DEPTH/WWD EXTENT OF ENERGY THAT

IS LEFT BEHIND.

THE PAST TWO OPERATIONAL ECMWF RUNS ARE EXTREME RELATIVE TO OTHER

OPERATIONAL RUNS WITH THEIR DEGREE OF FLOW SEPARATION... BUT THEY

FIT WITHIN THE BROAD ENSEMBLE SPREAD ASIDE FROM PSBLY BEING A

LITTLE DEEP WITH THE CLOSED LOW. THE PREFERRED ENSEMBLE MEAN SOLN

OFFERS A GOOD INTERMEDIATE SCENARIO ALLOWING SOME ENERGY TO LINGER

NEAR THE EXTREME WRN US-MEXICO BORDER FOR A LITTLE WHILE IN

RESPONSE TO THE UPSTREAM RIDGE... BUT TO A LESSER DEGREE THAN

ECMWF RUNS. THE 06Z GFS COMPARES LEAST FAVORABLY TO CONSENSUS

OVER THE CONUS BY DAYS 4-5 TUE-WED... SHOWING A SHARPER OVERALL

TROF AND EXTENDING A DOWNSTREAM RIDGE INTO THE GRTLKS/SRN CANADA

WHERE OTHER GUIDANCE SHOWS CYCLONIC FLOW. THUS THE 06Z GFS IS A

SLOW OUTLIER WITH SFC LOW PRESSURE/COLD FRONT.

BESIDES THE QUESTION OF WHAT HAPPENS TO ANY ENERGY THAT COLLECTS

OVER/NEAR THE SWRN CONUS/NWRN MEXICO... BY THE LATTER HALF OF THE

PERIOD SOME OPERATIONAL GUIDANCE INCL THE 00Z GFS/CMC INDICATE

POTENTIAL FOR NRN STREAM ENERGY TO BE VIGOROUS/CONCENTRATED ENOUGH

TO GENERATE A SFC LOW THAT WOULD AFFECT THE ERN STATES AROUND LATE

NEXT WEEK. BY THAT TIME FRAME INDIVIDUAL 00Z ENSEMBLE MEMBERS ARE

WIDELY DISPERSED WITH SFC LOW CENTERS... THOUGH NOT SURPRISINGLY

ECMWF MEMBERS MAKE UP THE LARGEST PCT OF SFC LOW CENTERS DEPICTED

OVER THE SRN TIER. SO FAR CONFIDENCE IS TOO LOW TO DEPICT SUCH A

SFC WAVE IN A DETERMINISTIC FCST.

DURING THE FIRST HALF OF NEXT WEEK EXPECT A PRONOUNCED WARMING

TREND AHEAD OF THE COLD FRONT PROGRESSING FROM THE WEST/PLAINS

INTO THE EAST. BEHIND THE FRONT MOST OF THE WEST SHOULD SEE BELOW

NORMAL TEMPS WITH SOME EVENTUAL MODERATION... THOUGH COOL READINGS

MAY PERSIST OVER THE GRTBASIN. ONCE THE ANCHORING SFC LOW TRACKS

NEWD INTO ERN CANADA... COLD CYCLONIC FLOW SHOULD SUPPORT AN

EXTENDED PERIOD OF LAKE EFFECT SNOW BY DAYS 5-7 WED-FRI. DURING

THIS TIME THE CORE OF COLDEST AIR SHOULD PROGRESS FROM THE NRN

PLAINS INTO THE GRTLKS/OH VALLEY. AHEAD OF THE FRONT GULF INFLOW

MAY SUPPORT SOME AREAS OF MDT-HVY RNFL OVER PARTS OF THE ERN HALF

OF THE CONUS AROUND TUE-WED. UNCERTAINTY WITH DETAILS OF FLOW

ALOFT OVER/NEAR THE SRN TIER STATES YIELDS LOWEST CONFIDENCE IN

DETERMINING LOCATION/INTENSITY OF PCPN ACROSS THIS REGION DURING

THE PERIOD.

RAUSCH

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