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Hampton Roads Obs/Disco


Martin

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looking good for thursday. Its good that gfs is a little flat (se) and weak in this timeframe as it will inevitably shift nw. Similar model camps as 12/26/2010 storm at 5 days out. Euro was bullish, gfs weak & OTS, cmc in the middle. Maybe we can get a repeat performace. Not the same synoptic setup as that storm, just talking model guidance. Intersting at least for us. :).

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Would be feeling pretty good if I was in SE VA at this point. Given the general consensus, this has all the hallmarks of a NE NC - SE VA SN-storm, dominant southern stream parcel and not dependent on a phase, OTS track, which should make it easier to resolve given the t-step. 0z EC scaled back the QPF by a factor of 4, but we have seen it numerous times this winter where the Euro latches on to a extreme solution in the 5-7 day, only to scale back if not loose it in the mid-range, and all the guidance coverages on a less extreme, albeit similar solution in the short term. :snowman:

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0z Euro is ok for us but stinks everywhere else :lightning:

It is showing a little something though for Tuesday but looks warmish.

TUE 06Z 08-FEB 7.0 3.1 1004 84 94 0.06 549 546

TUE 12Z 08-FEB 5.7 -0.6 1007 89 29 0.08 545 540

THU 06Z 10-FEB 4.5 -1.1 1014 81 95 0.04 551 540

THU 12Z 10-FEB 0.8 -6.3 1013 87 90 0.47 548 537

THU 18Z 10-FEB -0.9 -10.1 1018 47 6 0.06 544 529

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Monday/Tuesday Mess. Doesn't look like temps will be cold enough nor enough precip to matter.

NEXT SYSTM WILL CONSIST OF TWO PARTS. LOW PRS LIFTS THRU THE TN/OH

VALLEYS MON...WHILE A CSTL LOW/INVERTED TROUGH MOVS UP THE SE COAST.

LTST DATA SUGGESTS MOST OF THE FA REMAINS DRY AS MOST OF THE MSTR

GOES INTO CLOUD COVERAGE. LEFT LOW CHC POPS ACROSS SERN CNTYS WHERE

BEST CHC FOR AFTRN RAIN REMAINS. DRY ELSEWHERE. DESPITE THE CLOUDS...

DEEP SW FLOW ALLOWS TMPS TO RISE INTO THE M-U50S.

FA REMAINS SPLIT BETWEEN THESE TWO SYSTEMS MON NIGHT. QSTN REMAINS

AS TO HOW MUCH PCPN ACTUALLY FALLS ACROSS CENTRAL VA GIVEN THE

TRACK OF THESE TWO SYSTEMS. THE BEST CHANCE OF RAIN WILL BE ALONG

THE COAST WITH THE COASTAL LOW AND THUS HAVE INCRSD TO LIKELY POPS

THERE. THE STRENGTH OF THE NW/DOWNSLOPE FLOW NIGHT WILL DETERMINE

PCPN IS ABLE TO MAKE IT OVER THE MOUNTAINS INTO CENTRAL VA...SO

HAVE KEPT CHC POPS POPS. UPSHOT...XPCT THIS TO BE A LOW QPF EVENT

WITH AMOUNTS AOB ONE TENTH INCH. PCPN ENDS W-E AFTR MIDNITE AS

SYSTM PULLS FRTHR E. COME DCRG CLDNS ACROSS THE W LATE. LOWS IN

THE 30S.

AKQ still thinks mixing will be a problem here

.LONG TERM /WEDNESDAY THROUGH SATURDAY/...

LTST ECMWF NOW TRENDING MORE TOWARD A GFS SOLN IN MOVG A QUICKER

AND FLATTER SYSTM ACROSS THE SRN STATES THEN OFF THE MID ATNLNTC

COAST THRU MID WEEK PRD. CONFLUENT UPR LVL PTRN SPRTS A QUICKER

SOLN AS THERE IS NO BLOCKING HIGH TO THE N. THIS DOES A COUPLE OF

THINGS...1) RESULTS IN A SHORTER TIME FRAME FOR ANY SGNFCNT PCPN

TO FALL 2) KEEPS THE BEST LIFT/OMEGA OVR SRN / ERN HALF OF FA AND

3) ALLOWS TMPS TO MODERATE A BIT BRINGING P-TYPE ISSUES FRTHR NW

INTO FA.

SO FOR NOW...HAVE ADJUSTED WED NITES FCST A BIT AND CAPPED POPS

AT 50%. KEPT P-TYPE SNOW XCPT FOR A RAIN/SNOW MIX SERN CNTYS WITH

JUST RAIN ALONG CNTYS BRDRG ALBEMARLE SND.

KEPT LIKELY POPS ALL AREAS THU MORN AS THIS IS WHERE THE BEST LIFT

IS PROGGED...THEN LWRD THEM TO CHC POPS IN AFTRN. IF LTST ECMWF

IS RIGHT...PCPN QUICKLY ENDS W-E THURS AFTRN AS THE SYSTM PULLS

E. KEPT P-TYPE SNOW XCPT FOR BUFFER ZONE OF A RAIN/SNOW MIX FROM A

WAL-PHF-AKQ- RZZ LINE WITH JUST RAIN FROM HAMPTON ROADS ON S.

TMPS IN THE 30S TO NR 40 SE.

STILL TOO EARLY TO THINK ABOUT AMOUNTS DUE TO QPF & MIXING ISSUES...

BUT A FEW INCHES ARE PSBL IF AND WHERE IT STAYS ALL SNOW. STAY TUNED.

wx37midatlantic.png

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Monday/Tuesday Mess. Doesn't look like temps will be cold enough nor enough precip to matter.

AKQ still thinks mixing will be a problem here

First of all, we need the first storm to stay weak and it will... Forget storm 1. Usually we need 3 days of seperation for sig development to occur, so storm 1 needs to be weak and be a non factor to allow storm 2 a chance to develop. next, as nws points out, there's no anchored high to the north which usually does not bode well for us, but this is somewhat unique in that a strong enough high moves in tandem with the sfc low and is positioned in a favorable spot as the low reaches the coast. I believe most if not all guidance supports an all snow event and I don't agree with the current nws analysis. Things could change certainly, but I think the models have locked on to the genral idea, the key factor is that the tandem high continue to slide east with the sfc low as the models generally show now. If this ARCTIC high is centered over east half of PA as low reaches the coast we will have all snow while DC is just cloudy.

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How often have we been in the bulls eye 3-4 days out only to get shafted? Well, the answer is a whole lot. We are in the perfect spot right now. This thing will make a jog NW and most of us in Hampton Roads will see some snowfall. Maybe not a Dec 26 repeat, but possibly a 4inch event. All this "storm cancel" talk is really unwarranted. Let's wait until this storm pushes through on Tuesday before some of us go jumping off cliffs.

Just my 2 cents.

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How often have we been in the bulls eye 3-4 days out only to get shafted? Well, the answer is a whole lot. We are in the perfect spot right now. This thing will make a jog NW and most of us in Hampton Roads will see some snowfall. Maybe not a Dec 26 repeat, but possibly a 4inch event. All this "storm cancel" talk is really unwarranted. Let's wait until this storm pushes through on Tuesday before some of us go jumping off cliffs.

Just my 2 cents.

I agree. This should shift NW, just have to give it time. Hopefully not too much though. Failed on the weekend storm, maybe I'll fail with my rain for the rest of the year forecast too.

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