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February storm threat discussion


Ellinwood

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idk if it would end up being cold enough, but the 18Z RGEM has a nice slug of moisture to our west looking to hit us

we'll need some help with the building High pressure to the north

http://www.weatherof...YPES_t6_048.png

http://www.weatherof...st/3295_100.gif

EDIT: here's the animated precip map http://www.weatherof...YPES_t6_....png

Hmm, i like that look...High is trying to build down a bit

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If you can't be encouraged by this, then you can't be encouraged. From HPC.

THE MAIN MODIFICATION TO THE FINAL PROGS IN THIS PACKAGE WAS OVER

AND OFFSHORE THE E COAST STATES SUN/MON DAYS 3-4...WHERE WE PLAYED

UP THE INTENSITY OF THE SYS CROSSING TN/NC/VA AS PER THE 12Z/02

UKMET/CANADIAN/ECMWF. OTHERWISE FINAL PROGS KEPT THE IDEAS OF THE

UPDATED PRELIM. WE MAINTAINED THE 40-40 DETERMINISTIC ECMWF/GFS

20% FEFS MEAN BLEND FOR DAYS 6-7. THIS PRESERVED THE CHARACTER OF

THE AGREEABLE SHORT WAVE FEATURES OF THE GFS AND ECMWF MODELS.

EARLIER...WE HIGHLIGHTED A DIFFICULTY CONCERNING THE LOW LEVEL

COLD AIR SUN DAY 3 IN THE SRN MID ATLANTIC REGION. THE GFS 2M

TEMPS LOOKED WAY TOO WARM FOR DAY 3 MAX COMPARED TO TEMPS DERIVED

FROM THE ECMWF. PCPN OVER VA SUN DAY 3 WILL LIKELY BE FALLING INTO

A LAYER OF COLD AIR ADVECTING IN ON NE SURFACE WINDS. SUN AFTN

LOOKS EVEN COLDER FROM 12Z/02 GUIDANCE NOW THAT THERE IS BETTER

12Z MODEL CONSENSUS THAT THE NRN PORTION OF THE PCPN SHIELD WILL

BE SNOW....WITH SOME ACCUMULATION POSSIBLE. THE INTERESTING THING

IS THAT THE QPFS OF THE 12Z/02 GEFS ENSEMBLE MEAN...UKMET...AND

CANADIAN ARE SIGNFICANTLY HIGHER WITH THE QPF SUN BELOW THE MASON

DIXON LINE. THE CANADIAN IS THE MOST BULLISH OF THE NEW SOLUTIONS

AND BEGINS TO PHASE THE EJECTING PIECE OF ENERGY FROM THE PLAINS

STATES WITH NRN STREAM ENERGY SAT EVE TOPPING THE REX BLOCK OVER

FAR SWRN CANADA.

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idk if it would end up being cold enough, but the 18Z RGEM has a nice slug of moisture to our west looking to hit us

we'll need some help with the building High pressure to the north

http://www.weatherof...YPES_t6_048.png

http://www.weatherof...st/3295_100.gif

EDIT: here's the animated precip map http://www.weatherof...YPES_t6_....png

18Z RGEM three hour dominant precip. type hour 54.

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I was noting that the main difference between the GGEM and the GFS was the way it handles the GGEM’s secondary low and sequential energy transfer, and the GFS OTS .

The GGEM has some secondary Phasing with gulf moisture with when it reaches the eastern seaboard, and interacts with the plume of moisture streaming NNW out of the gulf.

http://www.ssd.noaa..../flash-vis.html

Now while both models show a cut off from gulf moisture the GFS doesn’t show and future interaction, while the GGEM brings some of that moisture back WHY?.

Now this is where I say I believe that while the moisture will get cut off, it’s the secondary moisture plume

http://www.ssd.noaa....c/flash-wv.html

This is what’s giving the system enough moisture to spread that precipitation shield just enough north, so that we’ll get into that precipitation.

One of the issues here we need to look out for is the speed at which the low goes as it goes by the gulf.

Cold air is a different issue entirely.

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