The Northeast Weather Blog...

Historic Blizzard of 2009...
Posted by: Zachary Labe, 9:14 PM GMT on December 17, 2009 +0
Thoughts on December 19-21th Snowstorm...
COMING FRIDAY NIGHT!!!

Timeline...
COMING FRIDAY NIGHT!!!

Radar...
Radar...

Warnings...
Warnings...

NAO...
NAO...

This is my current snow/no snow line...
Due to all snow as far south as southern North Carolina, I will post the snow/no snow line across northern areas...

Youngstown, OH - Oil City, PA - Du Bois, PA - Philipsburg, PA - Lewisburg, Pa - Bloomsburg, PA - Scranton, PA - New Milford, PA

*Areas north of line receive less than a dusting of snow, and areas to south see over .1inch of snow. This line may shift southward depending on dry air to north and eastern trends on mesoscale high resolution models.

Storm Reports...
Snow reports already over southern Middle Atlantic...
...SELECTED STORM TOTAL SNOWFALL IN INCHES FROM 700 AM EST FRI DEC
18 THROUGH 900 PM EST FRI DEC 18...

...KENTUCKY...
PINEVILLE 6.0
DORTON 3.0

...NORTH CAROLINA ...
BOONE 16.0
WEST ASHEVILLE 15.0
FLEETWOOD 14.0
WAYNESVILLE 13.8
WOODLAWN 13.0
GLENDALE SPRINGS 12.5
FLETCHER 12.0
MORGANTON 11.0
WEST JEFFERSON 10.0
ASHEVILLE 7.0

...VIRGINIA...
BLUEFIELD 13.0
BANDY 10.0
LAKE MONTICELLO 9.0
COVESVILLE 2SSE 8.5
COLUMBIA 7.0
ELK CREEK 7.0
ROANOKE 7.0
GREENVILLE 3E 6.5
BANDY 6.0
RICHMOND 3.0
CHARLOTTESVILLE 2.2

...WEST VIRGINIA...
SPANISHBURG 8.5
RAINELLE 8.0
LEWISBURG 7.8
ATHENS 7.0

Storm Impacts...
1. Historic amounts likely towards northern Virginia and all of Maryland up to two feet above 1000ft towards western Virginia.
2. Widespread travel impacts on busy holiday travel up and down east coast including I-95.
3. Blowing and drifting snow likely with potentially high drifts and whiteout conditions.
4. Mesoscale banding over northern Virginia, southeastern Pennsylvania, and Maryland may account for 2in/hr snow rates.
5. Widespread impacts with sharp cutoff on a very defined, but uncertain northern location in central Pennsylvania.

Snow Map...

*Note I am accounting for elevation, orographic lift, and mesoscale banding. The 12in+ zone is for those location courtesy of a slightly higher elevation than surrounding areas near 600' and for the optimum location in mesoscale banding. The northward extent in western Pennsylvania is courtesy of orographic lift for southern facing ridges. I do add a sharp cut-off between heavy snow and little to no snow, which will be difficult to pin down. It is already evident the effects the dry air is having on the north side of the system. This line may shift south depending on storm track, especially if HIRES NMM is correct. Keep in mind though despite the northwest trend in guidance on storm day this year, I did go pretty conservative for northern areas accounting for lack of lift and dry air.

Selected City Accumulations for the Northeast...
Hagerstown, MD- Heavy snow; 6-12in of snow.
Baltimore, MD- Heavy snow; 10-19in of snow.
Washington, DC- Blizzard conditions; 10-18in of snow.
Wilmington, DE- Heavy snow; 8-16in of snow.
Dover, DE- Blizzard conditions; 8-15in of snow.
Trenton, NJ- Blizzard conditions; 7-14in of snow.
New York City, NY- Blizzard conditions; 7-14in of snow.
Poughkeepsie, NY- Moderate snow; 3-6in of snow.
Binghamton, NY- Flurries and snow showers; C-1in of snow.
Albany, NY- Flurries and snow showers; C-1in of snow.
Hartford, CT- Heavy snow; 5-10in of snow.
Concord, NH- Mostly cloudy skies.
Providence, RI- Blizzard conditions; 5-10in of snow.
Worcester, MA- Moderate snow; 2-4in of snow.
Boston, MA- Moderate snow; 2-4in of snow.
Nantucket, MA- Blizzard conditions; 5-12in of snow.
Hyannis, MA- Blizzard conditions; 6-12in of snow.
Portland, ME- Flurries and clouds; Trace of snow.
Bangor, ME- Cloudy skies and breezy.
"Subject to Change"

Model Analysis
COMING FRIDAY NIGHT!!!

After the storm...
COMING FRIDAY NIGHT!!!

Please post storm reports in this blog from across the Northeast during the winter storm and please post location of observation in each report...

This blog is in progress. Check back soon...

"Here northeast of Harrisburg 2009-2010 winter statistics"
(Snow Stats)
Current Snow Cover- 9.00in with higher drifts
Monthly Total- 13.0in
Seasonal Total- 13.0in
Winter Weather Advisories- 2
Winter Storm Warnings- 1
Ice Storm Warnings- 0
Blizzard Warnings- 0
Freezing Rain Advisories- 1
Winter Storm Watches- 1

(Temperature Stats)
Lowest High Temperature- 28.0F
Lowest Low Temperature- 17.1F
Wind Chill Advisories- 0
Wind Chill Warnings- 0

(Winter Storms Stats)
Dec 5 - 1.5in - First accumulating snow of season
Dec 8-9 - 2.5in - Snow changed to plain rain
Dec 13 - .1in - Freezing rain
Dec 19 - 9.0in - Heavy snow, higher amounts to south
Categories: Winter Storm Blog
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Reader Comments
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101. PalmyraPunishment 2:16 AM GMT on December 18, 2009    
HAHAHAHAHAHAH after all that, you pretty much echo the shot that Blizz called? HAHAHAHAH
Member Since: January 31, 2007 Posts: 9 Comments: 2250
102. MarylandGirl 2:17 AM GMT on December 18, 2009    
Thanks Blizz, I shall post weather and totals and let you know what happens down here!

I'm so excited I probably will not be able to sleep tomorrow nite!!!!!

A possible WHITE CHRISTMAS in SOMD? Almost unheard of in this area!
Member Since: September 10, 2001 Posts: 2 Comments: 483
103. Zachary Labe 2:18 AM GMT on December 18, 2009    
Lets all breath, I do not think any of us expected the 18z NAM to verify, I mean 36in of snow, really? So far this run looks much more realistic.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
104. PalmyraPunishment 2:19 AM GMT on December 18, 2009    
hahaha 36 inches is a bit much, despite our being snow depraved. 8-12 inches will work just fine for me.
Member Since: January 31, 2007 Posts: 9 Comments: 2250
105. Snowlover2010 2:20 AM GMT on December 18, 2009    
Look at 48!
Member Since: January 7, 2008 Posts: 2 Comments: 1003
106. Zachary Labe 2:21 AM GMT on December 18, 2009    
0z NAM is big hit again with 982mb low off of Delmarva crawing the coast, wow!!!
Member Since: December 14, 2007 Posts: 253 Comments: 14293
107. RkTec 2:21 AM GMT on December 18, 2009    
Quoting Snowlover2010:
Look at 48!


Looks similar to 18Z. Also looks to be moving a bit slower. Another good run.
Member Since: January 27, 2009 Posts: 0 Comments: 384
108. RkTec 2:22 AM GMT on December 18, 2009    
Quoting Blizzard92:
0z NAM is big hit again with 982mb low off of Delmarva crawing the coast, wow!!!


+1 Awesome. Now if that damn GFS could get on board.
Member Since: January 27, 2009 Posts: 0 Comments: 384
109. SilverShipsofAndilar 2:22 AM GMT on December 18, 2009    
Will any of the precipitation showing on the NAM really verify if the system moves that far out to sea, or should we expect much, much less?
Member Since: December 1, 2008 Posts: 0 Comments: 600
110. Zachary Labe 2:23 AM GMT on December 18, 2009    
Quoting SilverShipsofAndilar:
Will any of the precipitation showing on the NAM really verify if the system moves that far out to sea, or should we expect much, much less?

The low is right off of Delaware, very close to the coast.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
111. tinkahbell 2:25 AM GMT on December 18, 2009    
What does it all mean?!!? I'm a newbie! I'm in Delaware...should I go to the store? LOL
Member Since: August 27, 2006 Posts: 0 Comments: 249
112. Zachary Labe 2:27 AM GMT on December 18, 2009    
tinkahbell- Best be gettin some of that bread and milk, lol. Anyways welcome!
Member Since: December 14, 2007 Posts: 253 Comments: 14293
113. SilverShipsofAndilar 2:27 AM GMT on December 18, 2009    
Quoting Blizzard92:

The low is right off of Delaware, very close to the coast.


Just ignore my questions when they're that stupid. I'll be fine.
Member Since: December 1, 2008 Posts: 0 Comments: 600
114. Zachary Labe 2:28 AM GMT on December 18, 2009    
O my word, 974mb low!!! off of New Jersey. Blizzard over much of region, heavy QPF of over 1inch back west past Harrisburg.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
115. tinkahbell 2:29 AM GMT on December 18, 2009    
LOL - My Mainer friends find it hysterical that we Delawareans go for milk, bread and tp when it threatens a dusting.
Member Since: August 27, 2006 Posts: 0 Comments: 249
116. Drakoen 2:30 AM GMT on December 18, 2009    
Very nice run on the NAM 00z and showing some consistency towards this solution. Looks like the Delmarva could get hammered. The NAM shows strong omega forcing and mid level dynamics. Looks like the jet could allow to come up the coast a bit more near Long Island.

We'll see if the ECMWF or GFS follows the suite.
Member Since: October 28, 2006 Posts: 57 Comments: 29010
117. Zachary Labe 2:30 AM GMT on December 18, 2009    
Quoting tinkahbell:
LOL - My Mainer friends find it hysterical that we Delawareans go for milk, bread and tp when it threatens a dusting.

Believe me so do we in southcentral Pennsylvania especially considering we have PENNDOT treating our roads, or there lack of.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
118. Zachary Labe 2:34 AM GMT on December 18, 2009    
Quoting Drakoen:
Very nice run on the NAM 00z and showing some consistency towards this solution. Looks like the Delmarva could get hammered. The NAM shows strong omega forcing and mid level dynamics. Looks like the jet could allow to come up the coast a bit more near Long Island.

Impressive Omega fields likely suggest Thundersnow over Delmarva. Bufkit towards Salisburg, Maryland suggests a bit of elevated convectivity for a 3hr period of the height of the storm. Also impressive 50knot winds aloft along I-95.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
119. hurigo 2:35 AM GMT on December 18, 2009    
WHAT? are you saying 36 inches of snow in DC?
Member Since: October 9, 2005 Posts: 96 Comments: 6608
120. Zachary Labe 2:36 AM GMT on December 18, 2009    
hurigo- That is not my forecast, just what one guidance showed. Still though they will have one of their stronger December snowstorms on record!
Member Since: December 14, 2007 Posts: 253 Comments: 14293
121. zotty 2:37 AM GMT on December 18, 2009    
Quoting Blizzard92:
O my word, 974mb low!!! off of New Jersey. Blizzard over much of region, heavy QPF of over 1inch back west past Harrisburg.


Uh, so are we talking about a good old fashioned bomb here? if half true the whole i-95 corridor, VA to ME, is in for a bad (good) time
Member Since: August 19, 2009 Posts: 0 Comments: 587
122. TheDawnAwakening2 2:37 AM GMT on December 18, 2009    
I agree Blizzard. Classic signature on water vapor imagery, this storm is a mean one. I already see the northern jet diving southeastward. A sign of a phasing storm soon. It is still windy here on Cape Cod, MA. We need this PV to move further north and stop this northwest flow to stop suppression. Anyways the Gulf of Mexico low is really slow moving and so is the Plains northern stream disturbance. A sign of a negatively tilting trough and amplifying of course. Now I am starting to worry about mixing issues for us on the Cape. Although winds will be more certain. I heard a NECN meteorologist Tim Kelley saying that hurricane force wind gusts could reach near Nantucket, MA. Also evaporational cooling will allow a colder storm, but who knows with a strong low to the south. Water temps in Cape Cod Bay is 46F, 46F!!!.
Member Since: December 4, 2009 Posts: 24 Comments: 251
123. pittsburghnurse 2:37 AM GMT on December 18, 2009    
Bread and spiked egg nog, true mother's milk. Let it snow.
Member Since: October 14, 2006 Posts: 1 Comments: 638
124. weathergeek5 2:37 AM GMT on December 18, 2009    
Quoting tinkahbell:
LOL - My Mainer friends find it hysterical that we Delawareans go for milk, bread and tp when it threatens a dusting.


I live in Northern Delaware I already bought my bread and milk :)
Member Since: December 25, 2005 Posts: 0 Comments: 1720
125. hurigo 2:37 AM GMT on December 18, 2009    
thanks for clarification Blizz. I'd love snow, but I don't want a ... historical ... blizzard (hide this comment from heavy)
Member Since: October 9, 2005 Posts: 96 Comments: 6608
126. jthal57 2:37 AM GMT on December 18, 2009    
Mt. Holly HWO:
A STORM MOVING UP THE COAST WILL BRING THE POTENTIAL FOR AN
ACCUMULATING SNOWFALL LATE FRIDAY NIGHT THROUGH SATURDAY NIGHT.
CHECK BACK FOR THE LATEST IN THE EVENT WINTER STORM WATCHES,
WARNINGS OR ADVISORIES ARE ISSUED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED SATURDAY AND SATURDAY NIGHT.
127. hurigo 2:38 AM GMT on December 18, 2009    
I worry about baltimore RN or some handle similar to that. Said had to go to work in hospital. Sounds like emergency planners need to be polishing their plans to get/keep people in right places.
Member Since: October 9, 2005 Posts: 96 Comments: 6608
128. PalmyraPunishment 2:40 AM GMT on December 18, 2009    
Baltimore RN works 7 pm - 7 am. I think I told her to call in dead. hahahahaha

Member Since: January 31, 2007 Posts: 9 Comments: 2250
129. Zachary Labe 2:40 AM GMT on December 18, 2009    
QPF totals...


*Remember add in 15:1 snow ratios especially for those of us in the northwest such as the Lower Susquehanna Valley. Probably a good 12-16in for us verbatum.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
130. PalmyraPunishment 2:41 AM GMT on December 18, 2009    
HAHAHAHAHAHAHAHAHA Accuweather.com is DOWN!
Member Since: January 31, 2007 Posts: 9 Comments: 2250
131. weathergeek5 2:41 AM GMT on December 18, 2009    
Will this rival the December 1966 storm?
Member Since: December 25, 2005 Posts: 0 Comments: 1720
132. Zachary Labe 2:43 AM GMT on December 18, 2009    
Alrighty CTP time to start issuing watches.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
133. Drakoen 2:43 AM GMT on December 18, 2009    
The Delmarva would see almost 3 feet of snow with 15:1 snow ratio.
Member Since: October 28, 2006 Posts: 57 Comments: 29010
134. PalmyraPunishment 2:43 AM GMT on December 18, 2009    
*goes to forums.accuweather.com*

SERVICE UNAVAILABLE

BAHAHAHAHHAHAHAHAHAHAHAAHAHHAHAHAHAHAHAHAHA
Member Since: January 31, 2007 Posts: 9 Comments: 2250
135. Mason803 2:43 AM GMT on December 18, 2009    
Quoting Blizzard92:
QPF totals...


*Remember add in 15:1 snow ratios especially for those of us in the northwest such as the Lower Susquehanna Valley. Probably a good 12-16in for us verbatum.


thanks for all the posts blizzard92. i'm off to bed dreaming of a 12+" snowfall. i'll be back on early tomorrow morn. Have a good night.
Member Since: November 5, 2008 Posts: 0 Comments: 1139
136. pittsburghnurse 2:43 AM GMT on December 18, 2009    
Baltimore RN will be packing a bag. It's a sleepover!
Member Since: October 14, 2006 Posts: 1 Comments: 638
137. WeatherBobNut 2:44 AM GMT on December 18, 2009    
Hi Blizz and all... I've not been on a while due to my wife in the Hospital with Pnuemonia. She's home now and doing better.

I've seen the models and all i can say is "WOW" i knew the westward trend would verify with this storm. It will spread a precip shield much farther to the north than forcasted. This will blow up into a very strong low. People should prepare now along the coast from the Carolinas to Boston. It will affect millions. 18z was a good run, the 06z NAM clobbers the entire east coast!

Anyways, it's good to be back and i'll also be back for the Christmas storm as well. Get ready guys, this is our winter!

-Weatherbob in Storm Mode
138. Zachary Labe 2:44 AM GMT on December 18, 2009    
Mason803- Sure thing, I will be on early as usual around 520am.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
139. Zachary Labe 2:45 AM GMT on December 18, 2009    
WeatherBobNut- Welcome back! Sorry to hear that and glad everything is doing better.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
140. SilverShipsofAndilar 2:46 AM GMT on December 18, 2009    
Frame-by-frame analysis of the NAM looked like we were in for anywhere between 0.75-2.15 total QPF. With 12:1 ratios that gives us 9-26" and with 15:1 ratios it gives us 11-33". I'm not sure where to go from here. It sounds too incredible to be true. I still want to stick with my original 5-8" forecast and anticipate us hitting the top of that mark, but I feel I am being pessimistic in light of the recent model run. However, I want to refrain from exhibiting the Margusity-style optimism that begs for a bust. What do we do now? How much confidence can we put in the NAM?
Member Since: December 1, 2008 Posts: 0 Comments: 600
141. weathergeek5 2:46 AM GMT on December 18, 2009    
Quoting WeatherBobNut:
Hi Blizz and all... I've not been on a while due to my wife in the Hospital with Pnuemonia. She's home now and doing better.

I've seen the models and all i can say is "WOW" i knew the westward trend would verify with this storm. It will spread a precip shield much farther to the north than forcasted. This will blow up into a very strong low. People should prepare now along the coast from the Carolinas to Boston. It will affect millions. 18z was a good run, the 06z NAM clobbers the entire east coast!

Anyways, it's good to be back and i'll also be back for the Christmas storm as well. Get ready guys, this is our winter!

-Weatherbob in Storm Mode


Glad to hear she is doing better. She will be in our thoughts.
Member Since: December 25, 2005 Posts: 0 Comments: 1720
142. originalLT 2:47 AM GMT on December 18, 2009    
Blizz, when do you think I'll see the snow begin on Sat. in SW CT? Was just at the grocery store near me, not busy at all, thats because our local mets are still down-playing the situation.
Member Since: January 31, 2009 Posts: 0 Comments: 5048
143. Zachary Labe 2:48 AM GMT on December 18, 2009    
SilverShipsofAndilar- NAM overestimates QPF for nearly every storm, so I usually chop QPF totals off by .25in-.5in for most systems. Anyways I think 5-8 is a nice semi-conservative and reasonable call for now.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
144. Zachary Labe 2:49 AM GMT on December 18, 2009    
originalLT- These model changes have been all within the last 6-12hrs so likely you will see local mets adjust their forecast tomorrow morning.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
145. hurigo 2:49 AM GMT on December 18, 2009    
Pittsburg RN will you have to do same
Member Since: October 9, 2005 Posts: 96 Comments: 6608
146. WeatherBobNut 2:50 AM GMT on December 18, 2009    
Thanks Blizz, glad to be back, the forums everywhere are buzzing like i haven't seen since Christmas 2002! This is going to be a fun winter, way over-due! I'm thrilled.

Thanks for the warm welcome back. tty all soon!

-Weatherbob
147. SilverShipsofAndilar 2:51 AM GMT on December 18, 2009    
I'm about to put the coffee on. When is the next model run?
Member Since: December 1, 2008 Posts: 0 Comments: 600
148. Zachary Labe 2:52 AM GMT on December 18, 2009    
0z GFS will initiate around 10:30pm.
Member Since: December 14, 2007 Posts: 253 Comments: 14293
149. tinkahbell 2:52 AM GMT on December 18, 2009    
When will all this stuff start? I'm hoping after 4. I teach in a juvenile detention center and I'm not really interested in spending the weekend there....though I could get my grading caught up...
Member Since: August 27, 2006 Posts: 0 Comments: 249
150. MarylandGirl 2:54 AM GMT on December 18, 2009    
Now I have read enough to be worried. Will check back in early tomorrow (we are up at 4:15) and see what is happening.....
May need another trip to store! anything over 4" and this county is shut down for a couple days.....
Member Since: September 10, 2001 Posts: 2 Comments: 483
151. Zachary Labe 2:54 AM GMT on December 18, 2009    
tinkahbell- It looks like by Friday night through Saturday early morning it will be up to the Mason-Dixon line.
Member Since: December 14, 2007 Posts: 253 Comments: 14293

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About Blizzard92
Cornell University- Atmospheric Sciences Student; Central PA SKYWARN Storm Spotter; American Meteorological Society Member; PA CoCoRaHS Branch Member

Personal Weather Stations
Linglestown, PA
Elevation: 520 ft
Temperature: 64.6 °F
Dew Point: 51.3 °F
Humidity: 62%
Wind: Calm
Wind Gust: 0.0 mph
Updated: 10:01 PM EDT on May 17, 2013
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