Thursday, January 22, 2015

My Final Call for Friday Night into Saturday Evening: Mixed Precip / Snow Event !

Issued 7:00 PM Thursday Evening.

For ROA / LYH / CHO VA Areas:
A mix of snow/sleet and rain develops during Friday afternoon and changes to a mix of Rain and Sleet during Friday Night. Mixed Precip and rain changes to some Sleet and Snow at times during Saturday morning before ending during the afternoon. 
Total snow and sleet accumulation of a Coating to near 1" can be expected !

For The Delaware Valley Region:
Including SE PA / Southern NJ and DE:
For SE PA: NW Suburbs of PHL:
Mostly all snow Friday evening to mixed snow/sleet and rain towards Saturday morning will change back to snow before ending during the afternoon and early evening hours.
Total Snow and Sleet Accumulation of 3"-5" can be expected.

For PHL, Northern DE, and Interior Southern NJ:
Mixed precip and rain Friday night and early Saturday changes to snow later Saturday and Saturday evening.
1"-3" of Snow and Sleet can be expected.

For Central / Southern DE & Extreme Southern NJ: South and East of DOV, DE to MIV, NJ. to ACY, NJ
A Coating to 1" with a few spots getting 2" away from the coastal areas.


Sunday, December 14, 2014

Snow Threat For The M/A States Increasing For Dec 20th - 21st Time Frame !

Thursday Evening Update: 

This storm threat has now diminished ! Our system will be much weaker and slide further south and off the SC Coast. At this time, NW NC / SW and Southern VA could see some light snow showers and mixed precip for Saturday and early Saturday evening. Little or no accumulations can be expected, with only and inch or so for the Higher elevations/Mnts of NW NC and SW VA !

I'm keeping a close eye on a potential snow threat for next weekend (Dec 20th-21st) for the Mid-Atlantic States. At this time the App Mnt's and Piedmont regions have the best chance for mostly snow, while the Coastal Plain regions from VA to DE and NJ look to be mostly rain, with some snow on the back end of this storm.
Global models all have different solutions in handling this rather complex upper level set up. With this threat still being 6-7 days away, the uncertainty level is high at this point. Split flow patterns with both a PJ and STJ involved can be tricky, but usually produce nice storms when they partially phase or fully phase. Per one of the best Global models and great in these patterns (THE EURO) develops a potential full phase of 2 pieces of energy which occurs near the M/A coast of VA, during next Saturday night into Sunday morning. The system begins to develop over the lower MS Valley during Friday and then moves ENE to the VA coast by Sunday morning.
As this storm is developing a large area of High pressure is pressing Southeastward into the G/L's region. This supplies us with the fresh cold air and suppresses the storm to a more southern track. The last 2 runs of the EURO model suggest a nice snowstorm for much of the M/A States with widespread 6"-12" amounts over the Mnt's and Piedmont of the M/A.
Though this a great model in this range (The EURO) I do think it's overdone with snowfall amounts (See attached Pics) but this has the potential to be a nice storm as the EURO suggests, so we need to consider it just as POTENTIAL for now, with it still being 6-7 days away !
As a PRELIM CALL, I think a 3"-6" event is possible for ROA / LYH / CHO VA areas next weekend. I'll have more towards mid week ! Del Valley areas look to be mostly Rain with some snow on the backside (Accumulations also possible there).
Take Care,

Sunday, November 2, 2014

My 2014-2015 Winter Forecast. For The Mid-Atlantic States and CONUS ! Discussion and Maps.

By John Ruggiano

November 02, 2014

From December 2014 Through February 2015 (Dec, Jan, Feb)

Another Cold Winter can be expected for the Central and Eastern CONUS. Expect higher snowfall amounts, and a more active storm track to shift further south and east this year !

A Weak El Nino Signal , along with a pronounced STJ (Subtropical Jet), will bring stormy conditions across much of the Southern US, and a good part of the Eastern 1/3rd of the Nation.

  Another cold and snowy winter is on the way, but the coldest weather and most snowfall will occur further south and east this year compared to last year. The cold air will be delivered by another -EPO signal and -AO due to a blocking type pattern. Warm SST’s continue over the Northern Pacific and near AK. This continues to promote a -EPO and + PNA signal, which allows for more ridging over the Western CONUS, Western Canada and Alaska. Colder air is then forced SE and downstream into the Central and Eastern US, very similar to last year. This will continue for this upcoming winter, but not as harsh as last years brutal cold spells.  (See Temperature Map)

With a weak El Nino (ENSO signal) expected for this year, a more active southern branch of the jet stream is likely. The Polar and Arctic Jet driven by a -EPO combined with the Southern Jet Stream driven by a weak El Nino, will produce a very active and stormy pattern for much of the Southern States, The Mid-Atlantic, and Northeast. Often We’ll see a Split Flow type pattern, Especially from Mid January into early March !

So this year things will change in comparison to last year, as the main storm track will likely be much further south, as weak El Nino conditions prevail. In addition, a more active subtropical jet can be expected. Last year we had a more pronounced Polar and Arctic jet, with a limited amount of activity from the Southern Branch. A strong -EPO and Pacific signal dominated for the most part, leaving the Midwest, Northern M/A and the NE in the Icebox with much above and record breaking snowfall.


The mean storm track for the 2014-2015 Winter Season will extend from the Southern Rockies, eastward to the SE States, and then mainly east of the Apps, through the M/A States and New England. Overrunning events will also be quite common from the Tenn/Ohio Valley into the Lower M/A States. This will also raise the flag for possible Moderate to Severe Ice Storms, from the Southern Plains, The Deep South and into parts of  the SE. This is something to be aware of this winter season. I expect plenty of this from mid January into much of February.

Clipper type systems with the Polar Jet (P/J) and Arctic Jet (A/J) will be less common, than the last year. Sure, we’ll still have a fair amount of activity with the Northern branch, but most of the energy this year will come from the STJ and the effects of a weak El Nino, with more southern storm systems.

Some of these Southern systems will get a chance to phase with the Northern branch energy, so I expect several Miller A type storms, mainly in January and February ! With this setup, a Split Flow pattern will be more common during the mid and later part of Winter. (See Storm Track Map)
This year I'm forecasting "Above Normal Snowfall" to be concentrated from the Southern Rockies into the Southern Plains. The second area will be from parts of the Deep South, into the Tenn, and Lower Ohio Valley, much of The SE, all of the M/A States, and into New England.

All other areas will be "Near Normal Snowfall", with the exception of the NW PAC and The Northern Rockies, where I'm forecasting "Below Normal Snowfall". (See Snowfall Map)

The NAO (North Atlantic Oscillation) And other key Teleconnections.

The NAO/AO couplet that I mentioned in the past is starting to show up again from this past summer into the fall. I’m seeing very similar wavelengths, and I expect this couplet to continue into the fall and winter months. The overall trends are showing Neutral to Negative wavelengths, which suggest blocking is developing. Last year the NAO was more Positive and the AO neutral to negative thanks to the -EPO helping some. SST’s over the North Atlantic do suggest more of a NEG NAO developing for this upcoming winter. So when we do see the NAO going negative, storms from the Southern Branch or STJ, will likely move up and along the Eastern Seaboard !

My Winter Forecast for The Mid-Atlantic States (M/A) and Virginia !

    The M/A and VA will see Below Normal Temps of (-1 to -3) and Above Normal Snowfall (125% to 175% of Normal Snowfall) for the 2014-2015 Winter Season !

Parts of Southern WV and the mountains of far SW VA, could see even colder temps of (-3 to -5) and Much Above Normal Snowfall (150% to 200 % of normal snowfall).

The winter season will start off slow with December being the mildest of the 3 winter months at near average temps and snowfall. Both January and February will be colder than normal with Above normal snowfall. February will be the coldest and snowiest month. As a bonus for snow fans, this could continue into early March before the pattern breaks down.

Here’s a breakdown for each month for the M/A Region, along with some forecasts for some selected areas.

December 2014
Temps: Near Avg. (-1 to +1)
Precip: Near Avg.
Snowfall: Near Normal

January 2015
Temps: Below Avg. (-1 to -3)
Precip: Above Avg.
Snowfall: Above Normal

February 2015
Temps: Below to Much Below Avg. (-2 to -5)
Precip: Above Avg.
Snowfall: Much Above Normal

My Forecast for Lynchburg, VA. (LYH)
Dec 01, 2014 - Feb 28, 2015  (Dec, Jan, Feb)

Mean Temperature: -2.0 F
(Below Avg.)

Mean Temp Range:  -1.0 to -3.0 F
(Below Avg)

Total Snowfall Range:  22" to 30"
(Above Normal)  Normal Snowfall is 17” for LYH VA.

Target Snowfall Prediction:  26"

Total Precipitation: Above Avg.

ROA  (Roanoke, VA)
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 26" to 34" (Above Normal)
Overall Forecast: Temps: -2.5 F / Snowfall: 30"

CHO  (Charlottesville, VA)
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 24" to 32" (Above Normal)
Overall Forecast: Temps: -2.0 F / Snowfall: 28"

RIC  (Richmond, VA)
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 14" to 22" (Above Normal)
Overall Forecast: Temps: -1.5 F / Snowfall: 18"

DCA  (Washington DC)
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 20" to 28" (Above Normal)
Overall Forecast: Temps: -2.0 F / Snowfall: 24"

BWI  (Baltimore, MD)
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 24" to 32" (Above Normal)
Overall Forecast: Temps: -2.5 F / Snowfall: 27"

PHL   (Philadelphia, PA) 
Temps: -1.0 to -3.0 F (Below Avg.)
Total Snowfall: 28" to 34" (Above Normal)
Overall Forecast: Temps: -2.5 F / Snowfall: 31"

NYC   (New York City, NY) 
Temps: =1.0 to -3.0 F (Below Avg.)
Total Snowfall: 32" to 40" (Above Normal)
Overall Forecast: Temps: -2.0 F / Snowfall: 36"


    In this segment I've attached all my maps, to summarize my overall Winter Outlook. Please see the (4) maps below: Temperature, Precipitation, Snowfall, and Overall Storm Track's. These maps best illustrate my outlook for the Months of: December, January, and February.

    These maps indicate the overall Anomalies for both "Temperatures" and "Precipitation" for the 3 month period. 
In addition I have included a “Total Snowfall Map”, relative to normal and a “Mean Storm Tracks Map”, to show the type of pattern I‘m forecasting for the winter months.

2014-2015 Temperature Map.jpg

2014-2015 Precip Map.jpg

2014-2015 Snowfall Map.jpg

2014-2015 Storm Track Map.jpg

   Take Care,

Thursday, October 16, 2014

Some thoughts and information about this blog. My Winter forecast coming Mid-November.

Hi All !

I just wanted to touch base and let you know I'm beginning to work on my Winter Forecast. I'll issue my call between Nov 10-15th.

In the past, I've issued my calls in early October, but at times found this to be premature for better accuracy and results with my overall calls. Waiting that extra month or so, better ensures a handle on the overall developing pattern, and studying the atmosphere's behavior. My goal is to deliver the best package and be at least 70% accurate with my National call.

Long range forecasting is not an exact science, nor is forecasting the weather. Mother Nature and The weather itself, will always win or beat you at some point. So, no matter how good you think you are, the weather will beat you at some point, that a fact Jack !

So moving on, I'll continue to post on my Blog during the Fall and Winter months with more frequency as we approach the Winter. I do use Facebook as another avenue in communicating my thoughts and forecasts. So please check out the Forum and Weather Page we use on a daily basis for better updates.

It's a closed group of over 400 members now, and you need to ask to join and then be approved. No drama or nonsense here, but we do have fun kidding and joking around, that's for sure. Many of the poster's and members are from the Mid-Atlantic Region and the Northeast.

Overall, it's a great group of weather enthusiasts. The Group name is "Horizon Weather Forum"

The link to the FB page can be found here:

The other information I wanted to share with YA ALL / YOUZ GUYZ, is I'm no longer living in Southern NJ and now live in SW/Central VA in good ole Lynchburg. I'm sure most of you already know this fact, but I wanted to make it more official for the folks that didn't know.

My local forecasts during this winter season will be more Central VA based, but I'll also cover the entire M/A and The Delaware Valley Region's with the bigger events.

Once again, more frequent and daily updates/thoughts will be posted on the Facebook "Horizon Weather Forum" during the Winter Season.

Take Care,

Saturday, August 2, 2014

The important driver to keep a close eye on from the Pacific !

This NEG EPO was the driving force for last Winter's Cold and overall storm track. As we know, a strong NEG EPO signal ruled for much of last winter.

The Atlantic signal was a flop, with a Neutral to Positive NAO. With a strong NEG EPO during last Winter, the Cold and Arctic air flooded the Central and Eastern CONUS for a good part of the winter. 

The Pacific signal IMO, can over-rule the Atlantic signal in a heartbeat. A bad Pacific signal (POS EPO) will in most cases negate a NEG NAO signal.

Such as last winter a POS NAO would in most case bring a milder and less stormy pattern to the East Coast, which was not the case due too a NEG EPO from the Pacific. Thus the PAC signal rules.

Here's a good illustration of a - EPO (top) vs. + EPO (bottom)

Monday, March 24, 2014

My Call: For Tuesday into Tuesday Night Snow event !

For ROA / LYH / CHO VA Areas:

Periods of Snow on Tuesday, with taper off and end by early to mid afternoon. Around 1"-2" of snow accumulation can be expected.

For The Delaware Valley Region:

Snow will develop during the mid and late morning hours and continue into Tuesday Evening. A general 2"-4" of snow can be expected with the higher amounts of 3"-4" falling from near PHL and points South and East mainly over Interior Southern/Central NJ and much of Northern DE.

The snow will mix with rain during the afternoon hours, towards Coastal Southern NJ, and over Central and Southern DE.
1"-2" can be expected in these areas.

Monday, March 17, 2014

Snowfall totals from 3-16 & 3-17 Snow event for parts of the M/A !

Wow ! If that Isn't a perfect picture of this winter's overall pattern here in the M/A ! Of course some systems further north but only few south of this map. I hate to say it for those waiting on Spring, but another Cold shot and winter sto...rm threat for the M/A and NE is looking good for the early to middle part of next week !

It's not very often, the M/A would see this much cold and snow with a neutral to positive NAO and no blocking. But, a strong and favorable Pacific EPO and PNA has be the pattern driver and force this winter. This has been sending the wave after wave of Arctic air downstream into the CONUS. With this comes numerous clippers and an occassional split flow and STJ, which has phased in to produce plenty of snow from the Midwest into parts of the M/A and NE.
Snowfall totals from 3-16 & 3-17 Snow event for M/A.