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Major National Winter Storm Dec 25-28


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BTW for anyone experiencing radar delays, AllisonHouse tweeted:

Some idiot just launched a Denial of Service attack against our network. Ryan is flipping us over to our backup... http://fb.me/CWZ4j1dO

and Radarscope relies on AllisonHouse data. Should be fixed shortly.

Update:

AllisonHouse LLC

Due to ongoing Denial of Service attack, we are proactively taking our public facing website(s) offline so we can focus on keeping our data feeds up and running.

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once this tornado finally goes dissipates and spares some lives and property here, we've got a major problem in PA now. 00Z models are in, and it looks like it's going to be a lot warmer between 800 and 850hpa, at least at the bufkit data i just saw for AVP, IPT, and ABE. i'll wait on the 00Z euro on this one, but the cast for northeast PA just might have a drastic change, from 5-8" snow and 0.1 ice to 2-3" snow and 0.5" ice. let's hope the Euro and Canadian doesn't confirm what the GFS and NAM are saying.

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post-97-0-32693400-1356499059_thumb.gif

Here's a loop of the TDS from the Troy storm. You can see the sudden drop in rho-hv down all the way to 0.3 at 10kft as the circulation tightens. Once the circulation weakens, the debris signal expands in size, weakens in intensity, and becomes displaced northward (to the left). All of this is a result of the fallout of the debris as the updraft and tornado weaken.

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Possible coastal severe outbreak across the Carolinas tomorrow.

day1otlk1200.gif

day1probotlk1200torn.gif

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1200 AM CST WED DEC 26 2012

VALID 261200Z - 271200Z

...THERE IS A MDT RISK OF SVR TSTMS ACROSS COASTAL SC/NC...

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS THE

SOUTHEAST/MID-ATLANTIC STATES...

...SYNOPSIS...

A PROGRESSIVE LONGWAVE PATTERN WILL REMAIN OVER THE CONUS DURING THE

PERIOD...HIGHLIGHTED BY AN ACTIVE SOUTHERN STREAM FROM THE SOUTHWEST

STATES/ROCKIES TO THE MID-ATLANTIC/SOUTHEAST STATES. MOST RELEVANT

FOR DEEP CONVECTIVE POTENTIAL IS A CLOSED TROUGH CENTERED OVER THE

MID-SOUTH/TN VALLEY EARLY TODAY AND AN ASSOCIATED 100+ KT POLAR JET

STREAK /250-300 MB/ TRANSLATING EASTWARD OVER THE GULF COAST REGION.

THIS UPPER TROUGH WILL BECOME INCREASINGLY CLOSED/NEGATIVELY TILTED

AS IT REACHES THE MID-ATLANTIC REGION BY TONIGHT. SEVERE POTENTIAL

TODAY WILL BE FOCUSED ACROSS THE CAROLINAS/SOUTHEAST STATES

NEAR/AHEAD OF AN EASTWARD MOVING COLD FRONT.

...CAROLINAS/SOUTHEAST VA...

A STRONG/POTENTIALLY SEVERE QLCS WILL LIKELY BE ONGOING THIS MORNING

ACROSS PORTIONS OF GA/NORTH FL...WITH A LESS VIGOROUS PORTION OF THE

QLCS/ASSOCIATED COLD POOL LIKELY TO BE LOCATED ACROSS THE SOUTHERN

APPALACHIANS VICINITY AND UPSTATE PORTIONS OF THE CAROLINAS. WHILE

AN EARLY DAY SEVERE THREAT MAY EXIST...A MORE ORGANIZED/SUSTAINED

SEVERE THREAT IS EXPECTED TO MATERIALIZE MAINLY ACROSS

COASTAL/PIEDMONT PORTIONS OF THE CAROLINAS BY THIS AFTERNOON.

IN CONJUNCTION WITH THE INCREASINGLY CLOSED/NEGATIVELY TILTED UPPER

TROUGH AND ASSOCIATED UPPER JET EXIT REGION/STRONG HEIGHT

FALLS...AMPLE DYNAMIC FORCING FOR ASCENT AND VERY STRONG VERTICAL

SHEAR /50-80 KT 0-6 KM/ WILL STEADILY OVERSPREAD THE REGION TODAY.

WHILE THE PRIMARY SURFACE LOW MAY MOVE DEVELOP NEAR/JUST WEST OF THE

APPALACHIANS...A SECONDARY SURFACE LOW SEEMS LIKELY TO

DEVELOP/SPREAD NORTHEASTWARD IN THE IMMEDIATE LEE OF THE

APPALACHIANS/PIEDMONT VICINITY OF THE CAROLINAS INTO SOUTHEAST VA

AND EVENTUALLY THE DELMARVA VICINITY. THIS SCENARIO WILL SUPPORT AN

INFLUX OF A RELATIVELY MOIST ATLANTIC AIRMASS IN TANDEM WITH A

NORTHWARD MOVING WARM FRONT...WITH LOWER 60S F SURFACE DEWPOINTS

LIKELY TO BECOME ESTABLISHED ESPECIALLY ACROSS COASTAL PORTIONS OF

THE CAROLINAS DURING THE DAY. PENDING THE DETAILS/EASTWARD

ADVANCEMENT OF THE EARLY DAY QLCS/ASSOCIATED COLD POOL...WEAK TO

MODERATE DESTABILIZATION IS EXPECTED IN THIS SAME CORRIDOR...WITH AS

MUCH AS 500-1000 J/KG SBCAPE ESPECIALLY ACROSS THE COASTAL

CAROLINAS...ALTHOUGH THE 00Z NAM MAY BE A BIT OVERDONE REGARDING THE

DEGREE OF DESTABILIZATION.

EXPECTED DEGREE/SPATIAL LOCATION OF HEATING/DESTABILIZATION AHEAD OF

THE COLD FRONT/QLCS AND ROBUST NATURE OF THE FORCING/WIND FIELD WILL

SUPPORT THE POSSIBILITY OF SEMI-DISCRETE STORMS/SUPERCELLS BY THE

AFTERNOON WITHIN A WEAKLY CAPPED WARM SECTOR...IN ADVANCE OF AN

EVOLVING/NORTHEASTWARD RACING QLCS. A VERY STRONG DEEP LAYER WIND

FIELD WILL BE ACCENTUATED BY A 50-65 KT SOUTHERLY LOW LEVEL

JET...WITH 200-400 M2/S2 OF 0-1 KM SRH POSSIBLE NEAR/SOUTH OF THE

WARM FRONT. THUS...TORNADOES...PERHAPS A FEW STRONG...WILL BE

POSSIBLE WITH THESE SEMI-DISCRETE STORMS...WITH MORE OF A DAMAGING

WIND/ISOLATED TORNADO THREAT IN ASSOCIATION WITH THE ADVANCING QLCS.

THE SEVERE THREAT SHOULD GRADUALLY END FROM WEST TO EAST AS THE

SURFACE LOW/COLD FRONT CONTINUE TO MOVE RAPIDLY EAST-NORTHEASTWARD

THROUGH THE EVENING HOURS.

...GA AND NORTHERN/CENTRAL FL...

A THREAT FOR DAMAGING WIND GUSTS AND PERHAPS A TORNADO WILL EXIST

TODAY IN ASSOCIATION WITH THE ONGOING QLCS/NEAR-COLD FRONTAL

CORRIDOR ACROSS GA INTO NORTHERN/CENTRAL FL. THE RISK IS EXPECTED TO

GRADUALLY DIMINISH WITH SOUTHWARD EXTENT ACROSS FL AS THE PRIMARY

DYNAMIC FORCING FOR ASCENT SLOWLY SPREADS AWAY FROM THE REGION LATER

THIS AFTERNOON.

..GUYER/SMITH.. 12/26/2012

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Morning e-mail from Jeff Lindner (HCFCD Pro Met) concerning preliminary damage reports across E Texas and a look ahead to the unsettled pattern ahead:

Progressive weather pattern over the southern US to continue.

Winds still coming down after the powerhouse wind event yesterday afternoon/evening with frequent gust to 40-50mph…for the second time in less than a week. Deep surface cyclone now moving into the OH Valley with skies clearing from WSW to ENE across SE TX under continued cold air advection pattern with temperatures near freezing and wind chills in the lower 20’s. Upstream air mass passing over the snow covered plains of N TX and OK will result in little modification today as solar energy goes into snow melt instead of warming the near surface air. With this in mind and NW winds continuing through much of the day, highs will only climb into the mid to upper 40’s under mainly sunny skies. Cold tonight as winds go nearly calm and skies remain clear…although could see some high level cirrus clouds pass over the region…but these rarely prevent cooling. Most areas will see lows in the 26-32 range except for the typical warmer spots (inside the Beltway and along the coast).

Coastal trough begins to take shape off the coastal bend early Thursday with a rapid increase in cloud cover as moisture is brought northward over top of the retreating cold surface dome. By afternoon isentropic lift may be enough to produce a few showers across the area. Highs will warm into the 50’s as winds turn more ESE on Thursday. Rain chances increase Thursday night into Friday ahead of the next powerful cold front. Surface trough will lift NE along the coast with light to moderate showers streaming northward out of the Gulf. Cold front will cross the region Friday afternoon with a line of showers and thunderstorms. Current thinking is that warm unstable air mass will remain out over the Gulf waters and the warm front will not move inland and this should negate a severe weather threat…however elevated instability may be enough to produce a few strong storms on the frontal boundary.

Once again windy behind this front, but not the kind of winds we saw yesterday. Should see NW 15-25mph Friday night under strong cold air advection. I am tempted to go a little colder than guidance for the weekend with the snow pack lingering to our north and fresh Canadian air pouring down the plains across this snow pack…however some degree of melting will occur between now and Friday night. Will stick with highs in the 50’s on Saturday under sunny skies and a light freeze similar to tonight on Sunday morning.

New Year’s Storm System:

Attention will quickly focus on another potential high impact storm system starting late Sunday and continuing through New Year’s Day. Model are having a tough time with this feature as with the Christmas Day event with the GFS more open and progressive versus the ECMWF and CMC more closed off and stronger. Given the current highly progressive flow across the US, will side toward the GFS, but the system may be somewhat slower than what this model shows. Anyhow the track of the core of the upper low/trough looks to be further south than the Christmas system which brings the threat for winter weather deeper into TX and suppresses the possible warm front closer to the coast. Parameters look to be coming together for another bout of severe weather across the area…possibly more focused deeper into the region than the past event yesterday. Still a ways off and things will no doubt change between now an early next week.

Christmas Day Storm Reports:

***Damage survey will be conducted today over Houston and Trinity Counties to determine tornado intensity and damage paths)***

Madisonville, Madison: numerous trees and roofs blown off along HWY 21 (possible tornado)

9 NW Crockett, Houston: tornado report by public near Houston County Lake

13 SE Crockett, Houston: tornado damage to a building and bank on 287. Large tornado recorded on cell phone relayed to broadcast media.

15 SE Crockett, Trinity: spotter reported a tornado on the ground moving across a pasture.

Lovelady, Houston: Lovelady fire chief report wind gust to 80mph

Tomball, Harris: *1 fatal* Non-Thunderstorm wind gust to 50mph resulted in numerous downed trees. Man was struck and killed by falling tree.

Cleveland, Liberty: Large Pine tree downed 8 miles SE of Cleveland (possible tornado)

Katy, Harris: Grass fire developed late in the afternoon along Katy Hockley Cut-off Rd and Clay Rd. 3 fire departments responded due to the strong winds. No homes were threatened

Corpus Christi, Live Oak: 200 acre wildfire burned 2 homes and 1 vehicle in the Hideaway Hills subdivision. Winds gusting to 50mph forced the evacuation of 90 residents as the fire spread rapidly. TX Forest service crews responded with local FD’s to bring the fire under control and saved over 50 homes

Dallas, Dallas: 2-4 inches of snow recorded across the metro area.

Plano: 3.0 inch snow

Tuesday Wind Gust:

BUSH IAH: 51

College Station: 54

Tomball: 46

Wharton: 45

Conroe: 49

Hobby Airport: 56

Brenham: 46

Bay City: 44

Galveston: 47

Lake Jackson: 46

Pearland: 51

Palacios: 53

Huntsville: 52

Bay City: 39

Victoria: 48

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the cell just off of wilmington has clear rotation on the radar velocities, would not be surprised to see a tornado warning issued for Onslow county as it rides northeast towards the coast; it has really ramped up the last few frames.

Edit: Tornado warning for Jacksonville, I'll let yall know if I see anything lol i'm directly in the path.

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the cell just off of wilmington has clear rotation on the radar velocities, would not be surprised to see a tornado warning issued for Onslow county as it rides northeast towards the coast; it has really ramped up the last few frames.

Edit: Tornado warning for Jacksonville, I'll let yall know if I see anything lol i'm directly in the path.

Going to hit the beach in a pretty populated area....looks to be headed right for North Topsail Beach and then over to Sneads Ferry first

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I'm just a little bit east of Jville so if it holds together I should be able to see it, my parents live by the beach part I went to Dixon High School where its at now.

Looks to go right over Sneads Ferry or just east of them, then up over Camp Lejune and towards Midway Park/Piney Green.

the couplet looks to be holding together pretty well

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SPC just downgraded the moderate risk which is a good call the warm front isnt getting inland qucik enough to make this a widespread event I dont think. Going to be confined to the eastern part of NC maybe NE corner of SC.

Couplet kinda washed out a bit if it cycles it might end up right over Jacksonville.

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