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The Jan 9-10 Storm Part 4


Cheeznado

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Area forecast discussion

National Weather Service Greenville-Spartanburg SC

307 am EST Monday Jan 10 2011

Synopsis...

a low pressure system will move from northern Florida today to the

North Carolina coast Tuesday. As the low continues to move

northeast in middle week...cold Canadian high pressure will be the

dominant weather feature across the southeast through the start of

the weekend.

&&

Near term /through tonight/...

a fairly significant upward adjustment is going to be needed in

accumulations throughout the area...and in the associated threat

language of the Winter Storm Warning. The models and ensemble means

are now showing considerably more quantitative precipitation forecast than previously...with about

an inch liquid equivalent through tonight in SW sections...and one

half to three quarter inches across northern and eastern sections of the

forecast area. This agrees well with the upstream trends of heavy

snowfall rates moving across the SW third of the area this

morning...and with negative epv regions still upstream over northern Georgia

where a few lightning strikes have been observed.

Synoptically...the models have initialized the potent vorticity lobe with

the southern stream wave over la quite well early this morning.

Frontogenetical forcing...upper jet divergence...and improving DPVA

ahead of the wave and north of the Gulf Coast surface low will likely

keep the higher snowfall rates in place across the region through at

least midday. The deeper qg forcing will likely weaken this

afternoon...with Omega transitioning to lower levels as warm

advection and upslope forcing improve. The strong middle level dry slot

is still expected to work into the area from the S starting early

this evening...and steadily move north across the rest of the area

overnight. This will allow a changeover to light freezing rain or

freezing drizzle.

The new west-southwest will feature snow accums around a foot around the NE Georgia

mountains...9 inches Asheville to gsp...6 to 8 for Charlotte metropolitan and

around 6 inches for north of the Interstate 40 corridor. About one

tenth inch of ice on tops could make power outages quite problematic

tonight...and driving nearly impossible.

:thumbsup: i saw that and just made a big ole pot of coffee. i am not about to fall asleep while a foot is not out of the question (i may have imbided a bit too much earlier lol)

this storm is just amazing, and is still raging. i do not know the last snowstorm in ga with a temp of 21

its starting to blow around, if this keeps up we will have bona fide snow drifts :guitar:

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URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC

351 AM EST MON JAN 10 2011

...CRIPPLING WINTER STORM IMPACTING THE REGION TODAY THROUGH

TONIGHT...

.LOW PRESSURE NEAR THE FLORIDA PANHANDLE THIS MORNING WILL MOVE

OVER THE SOUTHEAST COASTAL WATERS TONIGHT. ABUNDANT MOISTURE WITH

THIS SYSTEM WILL CONTINUE TO SPREAD ACROSS THE REGION

TODAY...INTERACTING WITH ARCTIC AIR TO PRODUCE HEAVY SNOWFALL

TODAY WITH LIGHT ICE ACCUMULATIONS TONIGHT.

ALEXANDER-IREDELL-DAVIE-CATAWBA-ROWAN-CLEVELAND-LINCOLN-GASTON-

MECKLENBURG-CABARRUS-UNION NC-CALDWELL MOUNTAINS-GREATER CALDWELL-

BURKE MOUNTAINS-GREATER BURKE-MCDOWELL MOUNTAINS-EASTERN MCDOWELL-

RUTHERFORD MOUNTAINS-GREATER RUTHERFORD-CHEROKEE-YORK-CHESTER-

INCLUDING THE CITIES OF...STATESVILLE...MOCKSVILLE...HICKORY...

SALISBURY...SHELBY...LINCOLNTON...GASTONIA...CHARLOTTE...

CONCORD...MONROE...LENOIR...MORGANTON...MARION...LAKE LURE...

RUTHERFORD...GAFFNEY...ROCK HILL...CHESTER

351 AM EST MON JAN 10 2011

...WINTER STORM WARNING NOW IN EFFECT UNTIL NOON EST TUESDAY...

THE WINTER STORM WARNING IS NOW IN EFFECT UNTIL NOON EST TUESDAY.

* LOCATIONS...THE FOOTHILLS AND PIEDMONT OF WESTERN NORTH

CAROLINA...AND THE EASTERN UPSTATE OF SOUTH CAROLINA.

* HAZARDS...HEAVY SNOW...WITH LIGHT ACCUMULATIONS OF SLEET AND

FREEZING RAIN.

* TIMING...SNOW WILL SPREAD ACROSS THE REGION FROM THE SOUTHWEST

THIS MORNING...BECOMING HEAVY AT TIMES THROUGH THE MORNING

HOURS. THE SNOW MAY MIX WITH...OR CHANGE TO...SLEET IN THE EARLY

EVENING HOURS...BEFORE GRADUALLY ENDING AS A PERIOD OF LIGHT

FREEZING RAIN AND FREEZING DRIZZLE THROUGH TUESDAY MORNING.

* ACCUMULATIONS...TOTAL SNOW ACCUMULATIONS OF 6 TO 9 INCHES

TODAY...WITH UP TO A TENTH OF AN INCH OF ICE TONIGHT.

* IMPACTS...ROADS WILL QUICKLY BECOME IMPASSABLE DUE TO THE HEAVY

SNOWFALL RATES. THE COMBINATION OF HEAVY SNOW EARLY IN THE

EVENT...WITH LIGHT ICE ACCUMULATIONS TONIGHT...WILL LIKELY

CREATE AT LEAST SCATTERED POWER OUTAGES. THE FREEZING

TEMPERATURES WILL MAKE TRAVEL NEARLY IMPOSSIBLE.

* TEMPERATURES...25 TO 30 DEGREES THROUGHOUT THE STORM.

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folks don't drive. mine started at 2:09 and I've got right at 2" already , less than 2 hours. Went to the store and made it fine. I almost didnt' get home. I got some good vids.

Robert great call on the storm buddy! Looks to be a storm we are all going to cash in on this go around :thumbsup:

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Area forecast discussion

National Weather Service Raleigh NC

344 am EST Monday Jan 10 2011

Synopsis...

very cold high pressure will extend into the region from the Dakotas

today. Meanwhile a low pressure system will track northeast along

the southeast coast today through Tuesday...bringing a wintry

mixture of precipitation to central North Carolina.

&&

Near term /through tonight/...

as of 310 am Monday...

Winter Storm Warning has been adjusted farther north and a little

sooner in the far south. A Winter Weather Advisory continues for the

far north-NE.

Band of heavy wintry precipitation across sections of NE Georgia into SC

occurring along an enhanced area of isentropic upglide aided by

upper level difluence aloft associated with 135+ jet exiting off the

northern middle Atlantic coast. Over central NC...a prominent surface

ridge extends northwest-southeast across the region...connected to an Arctic high

over the north central U.S. The Bone dry air underneath this ridge

will initially cause light precipitation advancing steadily north

toward our southern counties to evaporate/moisten up the sub cloud

layer. Once saturation achieved and/or heavier precipitation rates advance

into our southern counties...expect a swath of moderate snow to

occur between 5 am - 10 am along and south of a line from Albemarle

to Laurinburg. May see snow accumulate up to 2-3 inches within a

couple of hours. Due to close proximity of surface ridge and best

isentropic upglide occurring farther south over SC/SW NC...may take

a while longer for the column to saturate over the northern Piedmont

and central coastal plain. Thus...the earlier forecast of precipitation

holding off until middle day or early afternoon in the Triangle area

still looks good. May see precipitation begin a little sooner than expected

over the far western Piedmont in vicinity of Lexington and

Winston-Salem as dynamics aloft will be stronger in that region.

For areas north and NE of rdu...appears that precipitation will hold off

until after middle afternoon...possibly not until sunset. P-type

through middle day/early afternoon will be predominately snow. As the

afternoon wears on...should see snow mix with sleet over the

southern counties as the air mass around 5000ft warms to near or

slightly above freezing in response to the approach of an 850mb warm

front from the south. Expect mostly snow when precipitation rates are

heaviest then transitioning to mainly sleet when precipitation rates become

lighter. Maximum temperatures today hinge on duration/arrival of precipitation.

Adjusted maximum temperatures down a tad in the NE underneath the ridge with

little change elsewhere.

Tonight....precip shield will shift northward with time as 850mb

warm front lifts slowly north across region and weakening middle level

short wave crosses the region. Development of a warm nose aloft will cause

precipitation to transition from snow/sleet in the south to mainly freezing

rain prior to midnight. Over the north expect snow/sleet mixture for

most of the evening transitioning to freezing rain after midnight.

Over the northwest Piedmont...including The Triad...transition to freezing

rain may not occur until just prior to daybreak as the surface based

cold air will be more entrenched in this region. In addition to the

arrival of the 850mb warm front...atmosphere in the middle level dry

out appreciably in the favored region for dendrite growth. The

combination of these two factors will cause precipitation transition from

snow/sleet to more freezing rain/sleet.

Tough forecast due to the amount of precipitation to occur. Expect the best

lift to occur over the southern counties through late afternoon

then lift becomes more concentrated over the north this evening and

over the NE late tonight. The precipitation amounts in the forecast

generally a compromise between the drier European model (ecmwf) and the wetter

NAM/Gem. If European model (ecmwf) amounts verify...then expected wintry amounts will

be less by a factor of 33-50 percent.

Increased ice accretion slightly from previous forecast to account

for the potential for temperatures to hover in the upper 20s to near 30

degrees for a good part of the night. This temperature range has been found

to allow for decent ice accrual. If temperatures are warmer (closer to 32

degrees...then ice accrual will be much lighter/non-existent). Due

to combined effects of snow and ice...will upgrade the advisory for

much of the Piedmont into the central coastal plain to a Winter

Storm Warning.

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jburns looks like people are about to get caught off guard.

As from my profile you can see I am new and have not posted a lot....but I want to give a very deserving "that a boy" to Foothills and his forecast. Seems you were spot on here again, as you were with the Christmas storm. From now on, I know the only place I am going for my winter weather forecast. thumbsupsmileyanim.gif

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I'm refreshing and i'm still getting the old one that shows 6.3 inches for downtown Greenville. :unsure: Is that what yours shows for downtown Greenville? If so, then it's the old map from the earlier update.

Clear you cache.

Yea, that dryslot is worrying me a little bit. However, what robert is saying about the 850mb flow should keep precip building on top of us throughout the morning I think. There is also some heavy returns moving through western GA that should only expand as they move northeast. I haven't been out in about 20 minutes but I probably am up to at least 4.5 now. I absolutely love the way this snow is falling, it's just beautiful!!!

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Good point with the 850's. Got me worried a little also.

Clear you cache.

Yea, that dryslot is worrying me a little bit. However, what robert is saying about the 850mb flow should keep precip building on top of us throughout the morning I think. There is also some heavy returns moving through western GA that should only expand as they move northeast. I haven't been out in about 20 minutes but I probably am up to at least 4.5 now. I absolutely love the way this snow is falling, it's just beautiful!!!

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the 6z nam is so much colder than the RUC at the time frame. It keeps CLT to GSP close to -3 for a while and subzero the whole event through 24 more hours.. It also upped qpf. The RUC changes upstate over around 7 pm, but I guess most of the good stuff will be over by then anyway. I get the feeling all models have been playing catch up to this storm for days now. Just makes me think that someone in western SC and southern NC will also top the 12" mark. I'm pretty sure part of Ne GA will do it. (thats my groundzero)

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I hope that it is ok that I post this....

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE RALEIGH NC

425 AM EST MON JAN 10 2011

...SIGNIFICANT WINTER STORM EXPECTED ACROSS OUR REGION TODAY INTO TUESDAY...

.WITH COLD AIR ALREADY IN PLACE...A LOW PRESSURE SYSTEM WILL TRACK

EASTWARD THROUGH THE NORTHEASTERN GULF OF MEXICO THIS MORNING...

THEN NORTHEASTWARD UP THE SOUTHEAST AND MIDDLE ATLANTIC COASTS

LATER TODAY THROUGH TUESDAY. SNOW WILL OVERSPREAD THE REGION FROM

SOUTHWEST TO NORTHEAST TODAY...THEN TRANSITION TO FREEZING RAIN

TONIGHT AND CONTINUE INTO TUESDAY.

NCZ021>025-038>042-076>078-088-089-101730-

/O.UPG.KRAH.WW.Y.0002.110110T1200Z-110111T2100Z/

/O.EXB.KRAH.WS.W.0001.110110T1200Z-110111T2100Z/

FORSYTH-GUILFORD-ALAMANCE-ORANGE-DURHAM-DAVIDSON-RANDOLPH-CHATHAM-

WAKE-JOHNSTON-LEE-HARNETT-WAYNE-CUMBERLAND-SAMPSON-

INCLUDING THE CITIES OF...WINSTON-SALEM...GREENSBORO...

HIGH POINT...BURLINGTON...CHAPEL HILL...DURHAM...LEXINGTON...

ASHEBORO...PITTSBORO...RALEIGH...SMITHFIELD...SANF

RD...

LILLINGTON...GOLDSBORO...FAYETTEVILLE...CLINTON

425 AM EST MON JAN 10 2011

...WINTER STORM WARNING IN EFFECT FROM 7 AM THIS MORNING TO 4 PM

EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS UPGRADED THE WINTER

WEATHER ADVISORY TO A WINTER STORM WARNING...WHICH IS IN EFFECT

FROM 7 AM THIS MORNING TO 4 PM EST TUESDAY.

* PRECIPITATION TYPES: SNOW WILL OVERSPREAD THE WESTERN PIEDMONT

AND SANDHILLS LATER THIS MORNING...THEN CONTINUE NORTHWARD INTO

THE TRIANGLE AND SURROUNDING AREAS THIS AFTERNOON. THE SNOW WILL

MIX WITH OR CHANGE TO SLEET THIS EVENING...THEN TRANSITION TO

FREEZING RAIN OVERNIGHT. THE FREEZING RAIN WILL TAPER TO LIGHT

FREEZING DRIZZLE TUESDAY.

* ACCUMULATION: STORM TOTAL SNOWFALL OF 1 TO 3 INCHES CAN BE

EXPECTED... WITH THE MOST TO THE WEST AND SOUTH OF THE TRIANGLE

AREA. STORM TOTAL FREEZING RAIN ACCUMULATIONS OF AROUND ONE

TENTH OF AN INCH CAN ALSO BE EXPECTED.

* TIMING: SNOW WILL BEGIN OVER THE WESTERN PIEDMONT...INCLUDING

THE TRIAD...AND OVER THE SANDHILLS BETWEEN 900 AM AND

NOON...THEN SPREAD NORTHWARD ACROSS THE TRIANGLE BETWEEN 100 PM

AND 500 PM. SNOW...OR A MIX OF SNOW AND SLEET...WILL TURN TO

FREEZING RAIN BETWEEN 1000 PM AND 200 AM....BEFORE ENDING AS

LIGHT FREEZING DRIZZLE TUESDAY.

* IMPACTS: ROADS WILL BECOME HAZARDOUS WITH THE SNOWFALL ON TODAY

AND CONTINUE INTO TUESDAY. THE IMPACT OF SNOW AND ICE

ACCUMULATIONS COULD LEAD TO DOWNED TREE LIMBS... DOWNED TREES...

AND POWER LINES. THIS COULD RESULT IN SCATTERED POWER OUTAGES.

ONLY GRADUAL IMPROVEMENTS ARE EXPECTED TUESDAY INTO WEDNESDAY AS

THE COLD TEMPERATURES WILL LINGER.

* TEMPERATURES: WILL REACH THE MID 30S BEFORE THE SNOW ARRIVES

TODAY...THEN FALL INTO THE MID TO UPPER 20S AS SNOW BECOMES

WIDESPREAD. TEMPERATURES WILL BE IN THE MID 20S TO NEAR FREEZING

TONIGHT...THEN RISE SLOWLY INTO THE LOWER 30S ON TUESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...

SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO

POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE

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Mesoscale Discussion 17< Previous MD mcd0017.gif MESOSCALE DISCUSSION 0017 NWS STORM PREDICTION CENTER NORMAN OK 0206 AM CST MON JAN 10 2011 AREAS AFFECTED...ERN AL...CNTRL GA...CNTRL SC CONCERNING...WINTER MIXED PRECIPITATION VALID 100806Z - 101400Z SIGNIFICANT WINTER PRECIPITATION WILL CHANGE PHASE OVER MUCH OF THE AREA THROUGH MORNING WITH SIGNIFICANT ICING AND SLEET LIKELY. FREEZING RAIN RATES SHOULD AVERAGE 0.05 TO 0.10 IN/HR. A SURFACE LOW WILL CONTINUE EWD ACROSS THE NERN GULF OF MEXICO WITH INTENSE LOW LEVEL WARM ADVECTION PROFILES DEVELOPING INLAND ATOP A COLD AIR MASS. AT 07Z...THE SURFACE FREEZING LINE EXTENDED FROM MGM TO JUST N OF MCN AND INTO CNTRL SC. HOWEVER...THE SURFACE WET BULB ZERO LINE WAS MUCH FARTHER S SUGGESTING BOUNDARY LAYER COOLING WILL TAKE PLACE ONCE PRECIPITATION BEGINS. THEREFORE...AREAS CURRENTLY JUST S OF THE FREEZING LINE WILL LIKELY CHANGE OVER TO FREEZING RAIN...WITH AREAS ALONG AND JUST N OF THE CURRENT FREEZING LINE EXPERIENCING THE LONGEST DURATION. TO THE N...SNOW ACROSS NRN GA AND INTO CNTRL SC MAY EVENTUALLY SWITCH OVER TO SLEET AS A WARM NOSE FORMS ALOFT...WITH ACCUMULATING SLEET POSSIBLE. ..JEWELL.. 01/10/2011

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So the dry air punch showing up on the radar is fine?

I assume redevelopment like Burrel was taking about...

the 6z nam is so much colder than the RUC at the time frame. It keeps CLT to GSP close to -3 for a while and subzero the whole event through 24 more hours.. It also upped qpf. The RUC changes upstate over around 7 pm, but I guess most of the good stuff will be over by then anyway. I get the feeling all models have been playing catch up to this storm for days now. Just makes me think that someone in western SC and southern NC will also top the 12" mark. I'm pretty sure part of Ne GA will do it. (thats my groundzero)

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