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April Observations and Discussion


Gastonwxman

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:angry:

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/...

-- Changed Discussion --

WEDNESDAY AND WEDNESDAY NIGHT...LOW PRESSURE AND ASSOCIATED COLD FRONT WILL CONTINUE MOVING TOWARD THE REGION WEDNESDAY AND CROSS THE REGION WEDNESDAY NIGHT. THIS WILL KEEP THE CHANCES OF SHOWERS AND THUNDERSTORMS IN THE FORECAST...HOWEVER THUNDERSTORM CHANCES APPEAR SOMEWHAT LIMITED AS INSTABILITY IS LIMITED BY A WARM NOSE ALOFT AND PRECIPITABLE WATER VALUES STRUGGLING TO REACH ONE INCH. AS SUCH WILL KEEP POPS IN THE LIKELY TO DEFINITE RANGE WITH SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE AFTERNOON AND INTO THE EVENING. OVERNIGHT INSTABILITY WILL FURTHER ERODE WITH REMAINING THUNDER ENDING DURING THE EVENING WITH SHOWERS THROUGH THE NIGHT AS THE FRONT SLIDES ACROSS THE AREA.

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Still underneath an amazing thunderstorm. Lots of CC/CG lightning, heavy rain, and had a ton of pea-sized hail a few minutes ago. It's finally winding down but unreal of what has happened. Power was off in the neighborhood after a nearby transformer went out for a while earlier.

Now I'm hoping that the city electricians get down here soon because after one particular bolt struck, there is one part of our power line that's occasionally sparking and it seems to get worse when it doesn't rain hard enough... Getting worried about this....

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No kidding it is still hammering down out there and if this weekend holds up then we may be looking at some localized flooding.

Still a good bit of moisture on radar to our S & SW. As for the weekend sure seems like some flooding is a good bet.

A part of Gsp's long term from last night.

AT LOWER LEVELS...A DEEP SRLY FETCH OF MOISTURE FROM THE ERN GULF

WILL SET UP ON SAT AND INCREASE PRECIPITABLE WATER. A DEFORMATION

ZONE MAY THEN SET UP ACROSS THE FORECAST AREA AHEAD OF THE

APPROACHING DEEP SOUTH LOW...AND POSSIBLY PIVOT ALONG THE SRN

APPALACHIANS THROUGH SUNDAY. THIS WOULD BE A SETUP FAVORING HEAVY TO

EXCESSIVE RAINFALL ALONG THE MTNS. THE BEST INSTABILITY SHOULD WRAP

INTO THE SE HALF OF THE FORECAST AREA SAT AFTN...ALONG WITH DECENT

SHEAR AS THE SRLY 850 MB JET ARRIVES. SEVERE CONVECTION WILL BE

POSSIBLE IN THE SE PART. INSTABILITY WILL BUBBLE UP AGAIN SUNDAY

AFTERNOON IN THE SE HALF...BUT LIKELY WITHOUT THE ATTENDANT WIND

SHEAR.

AS THE SYSTEM PULLS AWAY SUN NIGHT INTO MONDAY...NW FLOW MOISTURE

SHOULD MOVE INTO THE SRN APPALACHIANS AND POSSIBLY LINGER THROUGH

MON NIGHT. IT IS QUESTIONABLE WHETHER PROFILES WILL GET COLD ENOUGH

TO SUPPORT ANY HIGH MTN SNOW SHOWERS...BUT A MIX WILL BE ADVERTISED

ALONG THE HIGHEST RIDGE TOPS. DRYING AND SHALLOW RIDGING IS EXPECTED

TO RETURN TUE...BUT WITH TEMPS REMAINING BELOW CLIMO.

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Still a good bit of moisture on radar to our S & SW. As for the weekend sure seems like some flooding seems likely.

A part of Gsp's long term from last night.

AS THE SYSTEM PULLS AWAY SUN NIGHT INTO MONDAY...NW FLOW MOISTURE

SHOULD MOVE INTO THE SRN APPALACHIANS AND POSSIBLY LINGER THROUGH

MON NIGHT. IT IS QUESTIONABLE WHETHER PROFILES WILL GET COLD ENOUGH

TO SUPPORT ANY HIGH MTN SNOW SHOWERS...BUT A MIX WILL BE ADVERTISED

ALONG THE HIGHEST RIDGE TOPS. DRYING AND SHALLOW RIDGING IS EXPECTED

TO RETURN TUE...BUT WITH TEMPS REMAINING BELOW CLIMO.

Im def interested in seeing some spring snow. Last year on May 17th, I went up to the Richland Balsam Overlook on the pkwy at 6053' and took video of snow falling, while it was dry as a bone in the valley. Always nice to see snow late in the game!

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From severe weather to the possibility of snow in the mountains! I'm a bit excited about this ULL forecast by the models and what it can bring.

The Euro decided to deepen the low quite a bit and run it up the Apps. If this occurs, snow showers will be possible in the higher elevations of NC, TN and VA. On the flip side, and a bit closer to home, the potential for a potent squall line is particularly interesting. The peninsula of Florida looks to see the worst of it as they are far enough away from the low and wouldn't be surprised to see an isolated tornado or two Saturday night. Of note, parts of the southeast could win the jackpot when it comes to rain! Others... Not so much. I have a fear/feeling we'll get dry slotted in southwest Georgia and southeast Alabama, or areas that see the squall line rumble through Saturday afternoon. It'll be interesting to track over the next few days.

http://davidwarrenreese.blogspot.com/2012/04/umbrellas-time-to-shine.html

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Appalachian snow and unseasonable cold on the way for the SE US next week?

Folks,

The 12Z Mon. Euro is, once again, a very cold run for this time of year with the 0C 850 line again getting down into S GA (4/23 and 4/24) similar to yesterday's quite cold 12Z run. Per this run, the entire period of next Sun.-Wed (4/22-5) is looking quite chilly for late April. If that's not enough about which to get excited, the model has accumulating snow for WNC and ETN on 4/22-3, very similar to the 0Z Euro's snow! Could we really be facing at least a weak analog of the incredible 4/25/1910 SE US snow and record cold that followed a very warm March of 1910? Stay tuned to this BB for further updates as they become available.

Historic snow/cold analog of 4/25/1910 back in play!

Folks, yep, as mentioned by Met1985 and Candy, it's baaaaaack! The 0Z Wed Euro, indeed, brought back the big Appalachian snow for the 3rd run of the last 5 and the big SE US cold snap for the 4th run of the last 6 after a two run break. What is the expression, a watched Doc never produces snow? Well, I was fast asleep during this most recent release. Moreover, this run has, by far, the heaviest snowfall of any run to date on 4/23-24. It puts down nearly 2" at GSP and Knoxville, an amazing ~6" at Asheville, and an historic near 12-14" at Johnson City, TN!! Please stay tuned to this BB for more updates as they become available!

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Historic snow/cold analog of 4/25/1910 back in play!

Folks, yep, as mentioned by Met1985 and Candy, it's baaaaaack! The 0Z Wed Euro, indeed, brought back the big Appalachian snow for the 3rd run of the last 5 and the big SE US cold snap for the 4th run of the last 6 after a two run break. What is the expression, a watched Doc never produces snow? Well, I was fast asleep during this most recent release. Moreover, this run has, by far, the heaviest snowfall of any run to date on 4/23-24. It puts down nearly 2" at GSP and Knoxville, an amazing ~6" at Asheville, and an historic near 12-14" at Johnson City, TN!! Please stay tuned to this BB for more updates as they become available!

I'm sure a lot will depend on what time of day it snows. It's gonna be hard to get a lot of accumulating snow with a warm ground and a high sun angle ( about the same sun angle as you see in August). Also, with temps 65-70 as forecast for Knoxville next Mon and Tues it will be hard to get snow to stick with those kind of temps.

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I'm sure a lot will depend on what time of day it snows. It's gonna be hard to get a lot of accumulating snow with a warm ground and a high sun angle ( about the same sun angle as you see in August). Also, with temps 65-70 as forecast for Knoxville next Mon and Tues it will be hard to get snow to stick with those kind of temps.

Temps were similar during the winter season and snow accumulated.

Agree with the sun angle part. It won't stick around over a day or two if it were to occur.

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I thought this HPC Discussion from this morning was pretty interesting. Really explains the setup and possible outcomes of this whole thing:

PRELIMINARY EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

1039 AM EDT WED APR 18 2012

VALID 12Z SUN APR 22 2012 - 12Z WED APR 25 2012

...GULF/EAST COAST CYCLONE TO BRING WET/POTENTIALLY SNOWY

CONDITIONS TO THE EAST...

THE GENERAL FLOW PATTERN IS AMPLIFIED TO START OUT THE MEDIUM

RANGE PERIOD...WITH A DEEP CYCLONE NEAR THE GULF COAST AT THE BASE

OF THE EASTERN TROUGH AND AN AMPLIFIED TROUGH IN THE EASTERN

PACIFIC. THE SITUATION CHANGES EARLY NEXT WEEK AS THE GUIDANCE

FINALLY AGREES TO SPLIT OFF A DEEP CYCLONE NEAR THE BASE OF THE

EASTERN PACIFIC TROUGH SOUTH OF THE 40TH PARALLEL AS THE NORTHERN

STREAM PORTION PROGRESSES INTO WESTERN NORTH AMERICA. ALTHOUGH

DETERMINISTIC AND ENSEMBLE GUIDANCE ARE IN GOOD AGREEMENT WITH THE

LARGE SCALE FLOW ACROSS THE CONUS...TIMING/STREAM DOMINANCE REMAIN

AN ISSUE WITH THE DEEP CYCLONE NEAR THE GULF LIFTING

NORTHEASTWARD. THESE DIFFERENCES LEAD TO SIGNIFICANT IMPACTS ON

THE PRECIPITATION FORECAST ACROSS THE EASTERN U.S. EARLY NEXT WEEK.

THIS WEEKEND...DETERMINISTIC MODELS ARE IN DECENT AGREEMENT WITH

AMPLIFYING AN UPPER TROUGH AS IT DIGS TOWARDS THE DEEP SOUTH AND

TRACKING A SURFACE LOW NEAR THE CENTRAL GULF COAST. AFTER EARLY

SUNDAY...THE ENVELOPE OF SOLUTIONS BEGINS TO DIVERGE.

OVERALL...THE LATEST RUNS OF THE GFS/GFS PARALLEL/GEFS MEAN ARE ON

THE FASTER SIDE OF MODEL SPREAD WITH LIFTING THE UPPER

TROUGH/CLOSED LOW NORTHWARD...AND THE ECMWF/ECMWF ENSEMBLE MEAN

OFFER SLIGHTLY SLOWER SOLUTIONS. THIS RESULTS IN LARGE

DIFFERENCES WITH THE SURFACE CYCLONE TRACKING NORTHWARD ALONG THE

EASTERN SEABOARD. THE 00Z GFS IS QUICKEST/FARTHEST EAST WITH THE

TRACK...MOVING THE DEEP CYCLONE WESTWARD OVER NEW ENGLAND. THE

00Z ECMWF IS SLOWER TO MOVE THE SURFACE LOW NORTHWARD AND

EVENTUALLY TRACKS THE CYCLONE INLAND/WESTWARD OVER THE CENTRAL

APPALACHIANS. THE 00 UKMET SUPPORTS THE SLOWER ECMWF...WHILE THE

00Z CMC/00Z GFS PARALLEL SUPPORT THE FASTER GFS. THE 00Z ECMWF

ENSEMBLE MEAN SEEMS TO OFFER THE BEST COMPROMISE AMONG CURRENT

MODEL DIFFERENCES...AND ITS ENSEMBLE MEMBERS SHOW DECENT

CLUSTERING WITH THE SURFACE LOW.

THE GOOD AGREEMENT AMONG DETERMINISTIC MODELS LED TO A BLEND OF

THE 00Z GFS/ECMWF EARLY IN THE FORECAST PERIOD. AFTER DAY 4...THE

FORECAST RELIED HEAVILY ON THE 00Z ECMWF ENSEMBLE MEAN. THIS HAD

LITTLE IMPACT TO THE OVERNIGHT FORECAST FOR DAYS 3-4...BUT

RESULTED IN A SLIGHTLY SLOWER TRACK WITH THE SURFACE CYCLONE

MOVING NORTHWARD ALONG THE EASTERN SEABOARD.

WEATHER-WISE...THE GULF COAST CYCLONE SHOULD BRING A CONVECTIVELY

ACTIVE FRONT ACROSS THE FLORIDA PENINSULA SATURDAY NIGHT. THE

EASTERN SYSTEM IS EXPECTED TO SPREAD SIGNIFICANT/DROUGHT-RELIEVING

RAINS THROUGH THE EAST WITH LOCAL AMOUNTS OF 4-6 INCHES POSSIBLE.

SNOWS APPEAR MOST LIKELY ACROSS WEST VIRGINIA/PENNSYLVANIA/NEW

YORK WITH THIS SYSTEM...THOUGH SNOWS ARE POSSIBLE FARTHER DOWN THE

APPALACHIANS INTO THE SOUTHEAST IF THE DEEPER ECMWF VERIFIES.

PRECIPITATION IS EXPECTED ACROSS WASHINGTON STATE MONDAY ONWARD AS

ONSHORE FLOW RESUMES. THE WEATHER SHOULD BE QUITE WARM AND DRY

ACROSS THE SOUTHWEST.

ROTH/GERHARDT

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