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Feb. 8-12 Model Discussion Part IV


DaculaWeather

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KCHS disco breaking it down :thumbsup:

CONDITIONS WILL RAPIDLY DETERIORATE TONIGHT AS THE AFOREMENTIONED

SHORTWAVE APPROACHES AND TAPS INTO A RIBBON OF PWATS IN EXCESS OF

1 INCH ADVECTING RAPIDLY NORTHEAST OUT OF THE EASTERN GULF OF

MEXICO. STRONG DIVERGENCE ASSOCIATED WITH A DEVELOPING COUPLED

250MB JET STRUCTURE WILL SUPPORT SCATTERED ACTIVITY INITIATING

SOMETIME AROUND MIDNIGHT WITH ACTIVITY BECOMING MORE WIDESPREAD AS

THE DPVA/QG-FORCING ASSOCIATED WITH THE APPROACHING SHORTWAVE

SPREADS IN FROM THE WEST. PLAN TO INCREASE POPS TO 90 PERCENT FOR

JUST ABOUT THE ENTIRE FORECAST AREA WHICH WILL BE MAINTAINED

THROUGH THURSDAY MORNING. ATTENTION SHIFTS TO P-TYPE AS

TEMPERATURES BOTTOM OUT IN THE MID-UPPER 30S PRIOR TO SUNRISE.

NARROWING DOWN ON THE DOMINATING P-TYPES CONTINUES TO BE THE MOST

CHALLENGING PORTION OF THE FORECAST. THERMAL PROFILES NOTED IN THE

VARIOUS MODEL SOUNDINGS INDICATE PRECIPITATION WILL PRIMARILY

REMAIN IN THE LIQUID PHASE FOR MUCH IF NOT THE ENTIRE EVENT WITH

THE EXCEPTION OF FAR INLAND AREAS ADJACENT TO THE EASTERN MIDLANDS

AND CSRA. NAM MODEL SOUNDINGS FOR ALLENDALE...MONCKS CORNER AND

WALTERBORO SHOW FREEZING LEVELS DROPPING TO AROUND 1200-1500 FT

BY SUNRISE WITH THE TOP OF THE CLOUD LAYER HOLDING IN THE -15C

RANGE COUPLED WITH RH NEAR 100 PERCENT IN THE FAVORABLE DENDRITIC

GROWTH ZONE. THIS PROFILE IS HIGHLY FAVORABLE FOR THE FORMATION OF

SNOW CRYSTALS WITH A GREATER THAN 90 PERCENT CHANCE OF ICE

NUCLEATION OCCURRING WITHIN THE CLOUD. FORECAST SOUNDINGS...HOWEVER

ARE ONLY MARGINALLY COLD ENOUGH TO SUPPORT FROZEN HYDROMETEORS

BELOW 3000 FT WITH A NEAR FREEZING ISOTHERMAL LAYER NOTED BETWEEN

1200-3000 FT. THIS THERMAL STRUCTURE TYPICALLY YIELDS A WIDE

VARIETY OF P-TYPES WITH THE DOMINATING PHASE BEING MODULATED BY

THE INTENSITY OF THE PRECIPITATION RATE. THE GFS/NAM ARE SIMILAR

IN SHOWING THE CORE OF THE MOST INTENSE DEEP LAYERED OMEGA

OCCURRING BETWEEN 5AM-9AM WITH THE AXIS OF STRONGEST Q-VECTOR

CONVERGENCE PASSING THROUGH AN HOUR EITHER SIDE OF 12Z. IT IS

DURING THIS TIME THAT ANY POTENTIAL CHANGE OVER TO SNOW OR SLEET

WILL OCCUR. ITS INTERESTING TO SEE THAT THE 09/12Z NAM IS SHOWING

A BAND OF 850-700MB FRONTOGENESIS DEVELOPING FROM HAMPTON AND

WALTERBORO NORTH TO FLORENCE COINCIDENT WITH A RIBBON OF NEGATIVE

EPV ATOP IT. THIS INDICATES THERE COULD BE A POTENTIAL FOR BANDED

CONVECTIVE PRECIPITATION...WHICH WOULD LIKELY TAKE THE FORM OF

MODERATE TO HEAVY WET SNOW. ITS TOO SOON TO SAY WHETHER THIS

MESOSCALE FEATURE WILL ACTUALLY DEVELOP...BUT ITS CERTAINLY A

POTENTIAL CONCERN AS IT COULD EASILY MODULATE THERMAL AND DYNAMIC

PROFILES ENOUGH TO SUPPORT SNOWFALL RATES OF 1-2 INCHES PER

HOUR...WHICH COULD EASILY PUSH ANY SNOW TOTALS INTO WARNING

CRITERIA.

GIVEN THE MARGINAL NATURE OF THIS EVENT...WE HAVE OPTED TO TAKE A

VERY CONSERVATIVE APPROACH. WILL HIGHLIGHT RAIN BECOMING MIXED

WITH SLEET/SNOW LATE TONIGHT ACROSS FAR INLAND AREAS WITH A RAIN

OR SNOW WITH A CHANCE FOR SLEET FROM ROUGHLY 5AM-9AM...ROUGHLY

NORTH OF A MILLEN-HAMPTON-WALTERBORO-JAMESTOWN LINE. RAIN WILL

DOMINATE ELSEWHERE WITH A FEW PELLETS OF SLEET POSSIBLE AS FAR

SOUTH AS METTER-STATESBORO-YEMASSEE-NORTH CHARLESTON. ATTM WE

BELIEVE ANY SNOWFALL AMOUNTS WILL BE LIGHT AND BELOW WINTER

WEATHER ADVISORY CRITERIA...WITH A TRACE TO LESS THAN 1/2 INCH

BEING THE MOST PROBABLE ON MAINLY GRASSY SURFACES. THERE COULD

CERTAINLY BE SOME LOCALLY HIGHER AMOUNTS...ESPECIALLY IF

MESOSCALE BANDING OCCURS...BUT THERE IS NOT ENOUGH CONFIDENCE THIS

FAR OUT TO JUSTIFY HOISTING A WINTER WEATHER ADVISORY. WILL ISSUE

A SPECIAL WEATHER STATEMENT INSTEAD TO ADDRESS THE POTENTIAL FOR

SNOW LATE TONIGHT AND EARLY THURSDAY...AND LET THE MIDNIGHT SHIFT

DECIDE ON THE NEED FOR AN ADVISORY. NO SIGNIFICANT TRAVEL IMPACTS

ARE EXPECTED ATTM.

PRECIPITATION WILL QUICKLY END FROM WEST-EAST THURSDAY MORNING

INTO THE EARLY AFTERNOON AS THE SHORTWAVE EXITS THE COAST. HIGHS

WILL RANGE FROM THE MID-UPPER 40S NORTH TO LOWER 50S SOUTH.

&&

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Off topic but does anyone know why I have my location listed in my profile but it doesn't show up when I post?

I see you've posted this several times. I think I saw it yesterday too. Basically you only have one place where you have listed a location

"Four Letter Metar Code For Weather Obs (Such as KDCA): KCLT"

That will show your weather obs but it will not show your location. To show your location you have to put it under the Location section in the profile. I hope that helps. Remember to click save.

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You have got to be kidding me! Mr.Super Conservative?

Incidentally...rain just started...at least my moisture is not being used up moistening the column.:arrowhead:

I just watched him and man I have to say I think he might be reading this board because his forecast sounded awfully familiar to me..1 to 2 heaviest between i-20 and 85. :whistle:

Seriously though, they are pawning ffc by actually going against their own WWA. Saying isolated 3 inch totals from atlanta to athens. Pretty funny.

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If you want snow these days, you either need to move to Georgia or the coast. What the heck does it take to get a healthy precip shield into Central NC anymore?

Try living in this area, the western part of Burgers Triangle in the Spring and Summer. You'd miss rain AND snow. Atleast most of NC gets rain usually (i know the drought this year there though).

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Try living in this area, the western part of Burgers Triangle in the Spring and Summer. You'd miss rain AND snow. Atleast most of NC gets rain usually (i know the drought this year there though).

Yeah, you guys have been having a bad stretch in your neck of the woods. Hopefully at some point, we'll move out of this "drought every couple of years" pattern.

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Try living in this area, the western part of Burgers Triangle in the Spring and Summer. You'd miss rain AND snow. Atleast most of NC gets rain usually (i know the drought this year there though).

Yea for some reason it seem like it has taken forever to moisten up the atmosphere once you get east of the mountains this year. Looks like precip is evaporating at around 2700ft AGL. That has been progressively coming down but will take at least half an hour to make it to the ground.

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Yea for some reason it seem like it has taken forever to moisten up the atmosphere once you get east of the mountains this year. Looks like precip is evaporating at around 2700ft AGL. That has been progressively coming down but will take at least half an hour to make it to the ground.

Same here in Cleveland County.. We have had returns for prob an hour or longer and not a flake here in Upper Cleveland.. Its not like we have ALOT of moisture to work with here anyways so any that is lost to virga is a bummer..:(

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Yea for some reason it seem like it has taken forever to moisten up the atmosphere once you get east of the mountains this year. Looks like precip is evaporating at around 2700ft AGL. That has been progressively coming down but will take at least half an hour to make it to the ground.

the mid level front moved through 2 hours ago. Thats what killed it here in the lee. I was afraid of that and accounted for it on the call map I made. Perfectly bad timing to NOT snow here.

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as soon as KCHS ramps up, they back off..... oh well, good night all :angry:

NEAR TERM /THROUGH THURSDAY/...

-- Changed Discussion --TONIGHT...A FEW CHANGES HAVE BEEN MADE TO THE OVERNIGHT FORECAST.

LATEST 00Z UPPER AIR SOUNDING MEASURED WARMER TEMPS THAN GUIDANCE

IN THE LOWEST 10K FT...LEADING TO A LESS THAN FAVORABLE SCENARIO

OF FROZEN PRECIP LATE TONIGHT. WIDESPREAD CLOUD COVER ALONG WITH

SFC DEWPTS IN THE UPPER 30S/LOW 40S HAVE ALSO KEPT SFC TEMPS A FEW

DEGREES WARMER THAN ANTICIPATED. WITH LATEST MOS DATA NOW

SUGGESTING WARMER OVERNIGHT LOWS AND OBSERVATIONS TO SUPPORT

IT...SEE NO REASON BUT TO RAISE OVERNIGHT LOWS A FEW DEGREES.

THEREFORE...EXPECT LOWS TO BE IN THE MID/UPPER 30S WITH COOLEST

TEMPS OVER FAR INLAND PORTIONS OF SOUTH CAROLINA AND GEORGIA. LOWS

WILL REACH AROUND 40 ALONG THE SC AND GA COASTS.

A STRONG H5 SHORTWAVE CONTINUES TO SHIFT TOWARDS THE SOUTHEAST EARLY

TONIGHT AND WILL PROVIDE A TRIGGERING MECHANISM FOR RAIN AS IT

ENCOUNTERS DEEP LOW LVL MOISTURE PRESENT OVER THE SOUTHEAST. UPPER

LVL DIVERGENCE FROM A STRONG H25 JET WILL FURTHER ENHANCE PRECIP

OVER THE REGION THROUGH THURSDAY MORNING. EXPECT RAIN TO DEVELOP

OVER INLAND GEORGIA FIRST...THEN SHIFT NORTHEAST INTO PORTIONS OF

SOUTHEAST SOUTH CAROLINA SHORTLY AFTER MIDNIGHT. GIVEN THE WARMER

TREND IN PLACE...PRECIP WILL PRIMARILY BE RAIN OVERNIGHT. THERE

WILL BE A SMALL WINDOW OF MIXED PRECIP NEAR DAYBREAK THURSDAY

MORNING SHOULD ENOUGH EVAPORATIONAL COOLING TAKE PLACE WITH HEAVIER

PRECIP. HOWEVER...CHANCES OF FROZEN PRECIP APPEAR TO BE LOWER THAN

PREVIOUS FORECASTS HAVE INDICATED. AT THIS TIME...HAVE LOWERED

CHANCE OF LIGHT SNOW/SLEET TO SLIGHT CHANCE OF LIGHT SNOW/SLEET

WITH LITTLE TO NO ACCUMULATION EXPECTED THROUGH 7 AM. SHOULD ANY

ACCUMULATION OCCUR...IT WILL LIKELY BE CONFINED TO GRASSY AREAS OR

TREES SINCE SFC TEMPS WILL BE AT LEAST 3-4 DEGREES ABOVE THE

FREEZING MARK.

THURSDAY MORNING...NO CHANGES HAVE BEEN MADE TO THE CURRENT

FORECAST THURSDAY MORNING THROUGH NOON. NARROWING DOWN ON THE

DOMINATING P-TYPES CONTINUES TO BE THE MOST CHALLENGING PORTION OF

THE FORECAST WITH THERMAL PROFILES SUGGESTING A SMALL WINDOW OF

OPPORTUNITY FOR FROZEN PRECIP FROM 7AM-9AM FOR AREAS WEST OF A LINE

FROM MONKS CORNER SC TO WALTERBORO SC TO ROCKY FORD GA.

HOWEVER...MOST PRECIP WILL BE IN THE FORM OF RAIN DURING THE

EVENT. ANY ACCUMULATION OF SNOW WILL BE CONFINED TO GRASSY AREAS

AND TREES...SHOULD ANY BANDED PRECIP OCCUR.

GIVEN THE MARGINAL NATURE OF THIS EVENT...WE HAVE OPTED TO TAKE A

VERY CONSERVATIVE APPROACH. WILL HIGHLIGHT RAIN BECOMING MIXED

WITH LIGHT SLEET/SNOW LATE TONIGHT. FROM 7AM-9AM...RAIN OR SNOW WITH

A CHANCE OF SLEET WILL REMAIN IN THE FORECAST FOR AREAS NORTH OF

A MILLEN-HAMPTON-WALTERBORO-JAMESTOWN LINE. RAIN WILL DOMINATE

ELSEWHERE WITH A FEW PELLETS OF SLEET POSSIBLE AS FAR SOUTH AS

METTER-STATESBORO-YEMASSEE-NORTH CHARLESTON. ATTM WE BELIEVE ANY

SNOWFALL AMOUNTS WILL BE LIGHT AND BELOW WINTER WEATHER ADVISORY

CRITERIA...WITH A TRACE TO LESS THAN 1/2 INCH BEING THE MOST

PROBABLE ON MAINLY GRASSY SURFACES. THERE COULD CERTAINLY BE SOME

LOCALLY HIGHER AMOUNTS...ESPECIALLY IF MESOSCALE BANDING

OCCURS...BUT THERE IS NOT ENOUGH CONFIDENCE TO JUSTIFY HOISTING A

WINTER WEATHER ADVISORY. WILL KEEP A SPECIAL WEATHER STATEMENT

OUT TO ADDRESS THE POTENTIAL FOR SNOW LATE TONIGHT AND EARLY

THURSDAY...AND LET THE MIDNIGHT SHIFT DECIDE ON THE NEED FOR AN

ADVISORY. NO SIGNIFICANT TRAVEL IMPACTS ARE EXPECTED ATTM.

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