Showing posts with label weather forecast. Show all posts
Showing posts with label weather forecast. Show all posts

Saturday, November 20, 2010

Thanksgiving Day Weather for Albany, NY & My Reminisces of Working on TGD

A brief climatology of Thanksgiving Day (TGD) weather for Albany, NY:

The warmest 1883 a high of 68 degrees and a low of 56, giving the warmest daily mean of 62.
The coldest was 1901 with a maximum temperature of  19 degrees, as well as, the coldest daily mean temperature of 15 degrees. The lowest minimum temperature was 5 degrees set in 1972.

The wettest TGD for Albany: 1886 - 1.77 inches of liquid equivalent precipitation ( 8" of snow was observed on this day).

Not too far behind this  particular TGD was 1971 with its 1.64 inches of melted precipitation which on this holiday was all snow and the most for Albany for TGD: 21.8 inches! (The snow actually started on Thanksgiving Eve ( the night of the 24th) thus the storm total was 22.5".)

Looking at the 20 greatest snowstorms of all-time for Albany this snowstorm  ranks as the 8th greatest single snowfall amount from one storm and for November's top 10  snowstorms it ranks as #1.


First let me say, I usually work most Thanksgiving Days  and I really don't mind it either. I'll work my "normal" shift that entails me doing NEWS10 in the Morning and NEWS10 at Noon then home for TGD dinner in the afternoon.

The "joke" about working TGD is that as far as the weather goes its an every other year thing, that is on alternating years the weather is either "active" or "benign".  (Last year's TGD weather was "benign" this year's may be "active" or at the very least not the best weather for the holiday.  I'll be updating this blog a lot over this weekend and upcoming days about this year's holiday and post holiday weather as it does look "interesting" for sure.)

Now for a bit of reminiscing on what had to be one of the wildest days that I ever have worked at WTEN . It was on Thanksgiving Day 2004!

The morning was warm and muggy for late November and I remembered driving in to work through areas of patchy dense fog and I also remember leaving early to get into work because there was the chance that it could prove to be a busy day.

Here's a bit of a clue as to why: The high temperature that TGD was 64 degrees (the 2nd warmest TGD on record for Albany) the low later that day was 30!

In a nutshell a strong area of low pressure and its associated cold front moves across Eastern NY State and Western New England resulting in a high wind and severe weather event late that Thanksgiving Day morning.
I remember saying on air that early morning to those who were watching that "I am not crazy but there is the chance for severe thunderstorm's this TGD!"

All told nearly 60,000 + customer lost power that day after the severe squalls moved through. Especially hardest hit were Saratoga, Washington and Rensselaer Counties in NY State. The power interruption became th big news story of the day: Folks whose homes were all electric scrambling to find a place to either cook their TGD dinner or somewhere to eat.

Below is a map from SPC on the severe weather reports  for that day along with a list of the reports and a "loop" of the hourly surface reports from that day.


SPC Storm Reports
1200 UTC November 25, 2004 - 1159 UTC November 26, 2004
20041125's Storm Reports

Note: All data are considered preliminary
Tornado Reports (in CSV format)
No reports received
Hail Reports (in CSV format)
Time Size LocationCountyStateLatLonComments
1320 75 OLD FORGE LACKAWANNA PA4137 7574 (BGM)
1512 75 GALWAY SARATOGA NY4302 7403 PENNY SIZE HAIL AT PROVIDENCE (ALY)
Wind Reports (in CSV format)
Time Speed LocationCountyStateLatLonComments
1340UNK CARBONDALE LACKAWANNA PA4157 7551 NUMEROUS TREES AND WIRES DOWN (BGM)
1345UNK BEACH LAKE WAYNE PA4160 7515 TREES AND WIRES DOWN (BGM)
1345UNK EQUINUNK WAYNE PA4185 7522 TREES AND WIRES DOWN. TRAILER FLIPPED. (BGM)
1420UNK JEFFERSONVILLE SULLIVAN NY4178 7493 TREES AND WIRES DOWN ACROSS WESTERN AND NORTHERN PARTS OF THE COUNTY (BGM)
1430UNK HANCOCK DELAWARE NY4195 7528 TREE DOWN (BGM)
1512UNK HURLEY ULSTER NY4191 7406 TREES AND WIRES DOWN (ALY)
1512UNK HARDENBURG ULSTER NY4200 7467 TREES AND WIRES DOWN (ALY)
1512UNK MALTA SARATOGA NY4297 7379 TREES AND WIRES DOWN (ALY)
1540UNK TAGHKANIC COLUMBIA NY4214 7368 TREES DOWN. (ALY)
1545UNK SALT POINT DUTCHESS NY4181 7379 TREES AND WIRES DOWN (ALY)
1600UNK SADDLE BROOK BERGEN NJ4090 7410 TREES DOWN CAUSING DAMAGE TO PRIVATE HOMES (OKX)
1605UNK SCHODACK CENTER RENSSELAER NY4255 7368 TREES DOWN (ALY)
1635UNK CLARENDON RUTLAND VT4352 7297 RUTLAND STATE POLICE REPORTED TREES AND POWER LINES DOWN IN CLARENDON AND SHREWSBURY. (BTV)
1635 59 RUTLAND RUTLAND VT4361 7298 (BTV)
1641UNK LANESBOROUGH BERKSHIRE MA4252 7323 WIRES DOWN (ALY)
1645UNK GOSHEN ORANGE NY4140 7433 TREES AND BILLBOARDS DOWN ON RT.17 AND HARRIMAN DRIVE CAUSING DAMAGE TO COMMERCIAL BUILDINGS (OKX)
1715UNK CABOT WASHINGTON VT4441 7231 MIDDLEBURY STATE POLICE REPORTED NUMEROUS TREES AND POWER LINES DOWN NEAR CABOT AND MARSHFIELD. (BTV)
1810UNK 3 SW LISBON GRAFTON NH4418 7195 LIMBS AND POWERLINES BLOWN DOWN ON MOSES CLARK ROAD. (GYX)
1815UNK 1 NW LITTLETON GRAFTON NH4432 7178 TREES BLOWN DOWN ON NORTH LITTLETON ROAD. (GYX)
Full report in comma-separated values (CSV) format
Fields marked UNK are unknown
All Times UTC
Wind Gusts in MPH
Hail Sizes in 1/100 of an Inch (75 = 0.75")   


Java Loop of surface reports for TGD 2004

An excellent write-up on the severe weather of that day was done by Tom Wasula a meteorologist at the NWSFO in Albany, NY. Here is a link to his write-up: Wind and Severe Wx Event from TGD 2004

In the wake of the severe weather strong NW to W winds prompted wind advisories to be issued for the afternoon and evening hours of that day and to top it all off, after the morning warmth and severe weather many locations across Eastern New York and Western New England saw brief snow showers or flurries that TGD night!

Well its time to check the latest Saturday AM data to see what will or won't happen this upcoming TGD. I'll likely have another blog update later today (probably late tonight).

Friday, November 19, 2010

A Cornucopia of Weather for Thanksgiving Week for Eastern NY State

Interesting possibilities in our weather for next week especially as we gear up for the Thanksgiving Holiday period along with all the travel that goes along with this time of year.

(Note of advice: When a weatherman or meteorologist uses "interesting" with an upcoming forecast it could mean not "so" good weather is heading our way).

A very active jetstream across the Western US this weekend will give rise to bouts of stormy weather across the country as we head towards the holiday period. Initially the worst weather will be across the Rockies and Plains States this weekend through Monday then these areas will likely see a turn to much colder air. As a matter of fact the first incursion of Arctic air will spill down across the Rockies and Northern Plains by late Monday through Wednesday.

As this arctic air plunges south and southeastwards early next week the active storm pattern and cold will begin to shift east towards the Eastern US by Wednesday through Thanksgiving Day (TGD). The cold front will advance east and reach the Eastern Great Lakes  and Ohio Valley on Tuesday. Ahead of this cold front mild air and clouds will start off the week for Eastern Upstate New York. There could be some showers on both Monday and Tuesday (especially on Tuesday) as the cold front gets closer and moves through.

This cold front is expected to move off the Northeast coast by late Tuesday/early Wednesday with colder air filtering in behind. The front is also forecast to stall during Wednesday along a line from the offshore waters of the Mid-Atlantic States across Southern Virginia to northern Texas. It is along this front that a series of low pressure systems will form and move east-northeast to northeast across the Eastern Great Lakes or perhaps New England.

For Wednesday, the "big" travel day before the holiday, most of the day now looks like it will be colder and mostly cloudy but dry. By Wednesday late afternoon/evening time it looks like the first wave of low pressure will be moving to southwest PA and this could spread an initial period of light precipitation across the Southern Tier of NY to Albany. With colder air over these locations this precipitation could very well be a wintry mix of sleet and snow perhaps even some pockets of freezing rain. This precipitation could last into early TGD morning, perhaps even nudging north by then into the Mohawk Valley, Adirondacks and Lake George regions where it could fall as a light snow.

A second more potent low pressure system is then forecast to follow this initial one during the TGD and track across the Eastern Great Lakes. This second low will result in a steadier precipitation to overspread all of interior NY State during the holiday. Initially it could be of a wintry variety but with a low track across Western New NY State a change to rain should occur.

However, if a secondary area of low pressure develops along the Delmarva Peninsula (and this is a very distinct possibility) then colder air could remain locked in along and north of the Mohawk Valley-Albany-Southern Vermont line, keeping the precipitation either a wintry mix or perhaps even all snow!

Our weather prediction computer models are offering a variety of possibilities and scenarios to the holiday period weather. So all that I can say as of right now, I'll be updating this this blog  so make sure to follow it as well as your local weather forecasts, too. We should be able to get a better grip on what will happen as we get closer to the event.

Another thing to watch out for over the TGD weekend is the potential for the seasons first significant "lake-effect" snows to develop downwind of  Lakes Erie and Ontario. I believe the potential is there for some locally very heavy snow to fall across the "favored" snowbelts of NY State. This will likely be the subject of another blog update later in the week.

Sunday, January 24, 2010

Significant Storm For Tonight & Monday

The tranquil weather of the past week or so across Eastern New York State and Western New England will be coming to an end over the next 24 to 36 hours. As a multihazard storm system will affect the region.

A complex storm system moving north and east from the middle of the country will threaten Eastern New York (ENY) State and Western New England (WNE) with the following adverse weather:

Primary Threats
- Heavy Rain causing possible flooding especially in poor drainage areas
- Stream and River Flooding due to heavy rainfall PLUS mild air causing snowmelt (in areas where snowpack exists) adding to the runoff
- Ice Jam flooding potential also due to the mild temperatures that could cause ice to break up and shift/move on streams.

Secondary Threats

- Precipitation may start as a brief period of sleet and/or snow or freezing rain (along and north of I-90) in ENY and WNE

- Possible strong winds later tonight and Monday, especially across higher terrain of ENY and WNE where gusts in excess of 45 mph could occur, especially AOA (At Or Above) elevations of 1500 feet

The complex storm system that will affect us extends from the Western Great Lakes (Wisconsin) south-southeast to the Southeast U.S. (SEUS). Over Wisconsin one storm is located and it moving north-northeast across the U.P. of Michigan. A second storm is developing over the Lower MS Valley Region.

It is this low that will move N-NNE along or just west of the Appalachians with some moderate deepening (strengthening) enroute to Lake Ontario by tomorrow afternoon.

Numerical Weather Data indicates the high likelihood that ENY and WNE will receive 1-2 inches of rain with most of this precipitation falling during the morning through early afternoon of Monday 25 Jan. There will also be locally enhanced rainfall especially over favored upslope areas of the Adirondacks in NYS and across the Taconics and Berkshires where amounts of 3-4 inches are possible.

With the low over the Lower MS Valley this afternoon moving across SE Canada Monday night, its associated cold front will sweep east. Ahead of this front very mild air will surge north followed by a return of seasonably cold air towards Tuesday Morning. As this colder air returns it is possible that there could be a period of snow late Monday night through early Tuesday morning, especially across west facing slopes of the Catskills, Western Adirondacks and more so across the higher terrain east of the Capital District. For locations here there could be some accumulations.

Now we can look at some data for this upcoming event.

The data that we are looking at will be time sections (TSEC) for various locations across ENY and WNE. The TSECS show the following: along the X-axis is the time (increasing from RIGHT to LEFT from 0 hour to 72 hours). The Y-axis is height decreasing UP. Relative humidity is contoured, temperatures in degrees Celsius, wind speed and direction is indicated along each vertical axis. Speed is indicated by barbs and pennants; a full barb is 10 knots of wind, a half barb is five knots; pennants equal 50 knots of wind. Yellow dash lines indicate forecast lift, or vertical motion (called vertical velocity [VVEL] or Upwards Vertical Motion [UVM])

Here is a TSEC for Albany, NY from the 24 Jan 12Z NAM model:


The strongest UVM is centered approximately between approx 5am and 4pm 25 Jan and it is during this time that the heaviest precipitation is expected to fall.

Also note on the TSEC chart during the forecast hours of 42 through 48 hours (1am through 7am Tuesday 26 Jan) another "maximum" of UVM move through with moderate and nearly uniform W-WSW winds from the surface up to just below 700 millibars. This is the cold front moving through with another burst of precipitation possible. With temperatures expected to be decreasing/lowering this few hour period of precip could fall as snow.

Now onto a TSEC for Mount Equinox VT in the Taconics (Manchester, VT):



Mt.Equinox (elevation 3816 feet) has the potential for experiencing strong SSE-S winds from about 9p-10p 24 Jan through 1pm 25 Jan in advance of both the northward moving cold front and the eastward advancing occluded front. Sustained speeds of 20-28 kts are possible across the higher terrain of WNE and extreme ENY. Note the forecast winds centered around 850 millibars - note the barbs and pennants at this height level and during this time period. Using the 85 rule: take the 85% of the 850 millibar wind speeds to get "expected" gusts thus gusts of 50kts or more are possible over the higher terrain.

TSEC for Speculator, NY:



Similarly the TSEC for Speculator indicates the potential for strong SSE-S winds both sustained winds (20-25 kts) with gust potential for 50kts or more.

In both the Speculator and Mt. Equinox TSEC data the best chance or time period when strongest winds occur will probably be in advance of the occluded frontal passage during the afternoon hours of Monday 25 Jan.