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March Pattern Discussion


jaxjagman

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12z Euro keeps the cold air just out of reach and, up to hour 150, not even much QPF to work with.  After 150 two nice juicy storms roll through back to back.  We'll have to keep an eye on those.

 

12z GGEM is looking friggin fantastic.  Got a storm around hour 174 that lays down between 2 and 5 inches across the TN Valley then a statewide big dog at hour 216 giving a huge swath of middle TN 7 to 8 inches of fantasy lollipop lovin (most of TN gets at least 4 to 6).

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I didn't see much on the 0z runs to get excited about.

 

GFS has us making a run for the teens a couple of nights this week with a possible dusting Friday night.  It has a juicy storm around hour 150 but the cold can't catch it in time.

 

GGEM backed off the big dog it was showing yesterday but still shows snow potential around hour 150 especially north middle TN and a more widespread light event at hour 222.

 

Euro op run was meh and it's control run backed up the meh-ness.  They show a cold chasing moisture deal around hour 150 not unlike the GGEM and GFS.  I suppose this could pan out but I'm not getting my hopes up.

 

The good news is Euro ensembles are still showing some decent possibilities across the region.  From Memphis to Bristol there are about 12 out of 51 members showing greater than 2 inches of snow and at least one big dog (in the hour 150-240 range).  The mean snow totals are between 1 and 2 inches. 

 

Also the AO seems to stay fairly negative and PNA will be making a run at positive.  At least we have that going for us.

 

Edit:  Robert is noting that the models are trending warmer in the short/medium range.  Doesn't think they have a good handle on specific systems beyond a few days out but to keep an eye on the Euro in the longish range as it is showing some potential.

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What I take out of the upcoming pattern is that models are going to struggle quite a bit and with two separate streams anything is going to be possible.

 

Looks like a nice snowstorm for some in the Carolinas toward day 8-9, with another healthy shortwave rolling across the southern plains and a 1035 high in a similar position.

 

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What I take out of the upcoming pattern is that models are going to struggle quite a bit and with two separate streams anything is going to be possible.

 

Looks like a nice snowstorm for some in the Carolinas toward day 8-9, with another healthy shortwave rolling across the southern plains and a 1035 high in a similar position.

 

The total snow through 240:

 

T0ElYe4.jpg

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Pattern is still remarkably good considering the time of year, almost March.  But...and a big but...there is nada in terms of snow.  Still hints of a storm somewhere Apps westward next week.  I still don't see the ice set-up the GGEM is brewing, unless it is just pumping cold air down the plains w/ the big high.  Overall, still a decent shot at winter weather...but every day we go into March things get that much tougher. 

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The 0z Euro control run has a huge snow storm starting around hour 240 (Sunday week).  The clown map looks like a unicorn barfed cotton candy all over the TN Valley.  3 to 7 inches statewide with a huge swath of west and middle TN getting a solid 6.  The op run also has a miller A that almost gets us into the action but buries NC instead.  Something to watch.

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The 0z Euro control run has a huge snow storm starting around hour 240 (Sunday week).  The clown map looks like a unicorn barfed cotton candy all over the TN Valley.  3 to 7 inches statewide with a huge swath of west and middle TN getting a solid 6.  The op run also has a miller A that almost gets us into the action but buries NC instead.  Something to watch.

Can you share maps?

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HPC

 

 

..GUIDANCE EVALUATION AND SENSIBLE WEATHER HIGHLIGHTS...

SOLUTIONS ARE IN THE PROCESS OF GRADUALLY CONVERGING FOR THE WAVE
SFC/ALOFT THAT SHOULD GENERATE QUITE A SWATH OF HEAVY SNOW...AND
TO THE IMMEDIATE SOUTH A SIGNIFICANT TRANSITIONAL ZONE OF
DANGEROUS SLEET/FREEZING RAIN...FROM THE OH VALLEY INTO THE MID
ATLC/SRN NEW ENGLAND.  THERE IS RELATIVE AGREEMENT UPON AN
ELONGATED AREA OF LOW PRESSURE OVER THE ERN TN VALLEY/S-CENTRAL
APPALACHIAN AS OF EARLY MON TRACKING OFFSHORE MON NIGHT.  PLEASE
CONSULT SHORTER RANGE PRODUCTS FOR UPDATED INFO ON THIS SYSTEM
THAT IS CROSSING INTO SHORT RANGE TIME SCALES.

THERE IS REASONABLE CONSENSUS WITH A MODERATELY VIGOROUS SHRTWV
REACHING THE WEST COAST WED-THU AND BRINGING ANOTHER ROUND OF
LOCALLY HVY RNFL/HIGHER ELEV SNOW TO THE NRN/CNTRL PARTS OF THE
WEST.  ENERGY REACHING THE WEST AROUND TUE IS EXPECTED TO AMPLIFY
INTO THE PLAINS/SOUTHEAST THEREAFTER AND SUPPORT LOW PRESSURE NEAR
THE GULF/SOUTHEAST COASTS BY DAYS 6-7 THU-FRI.  INCREASED
AGREEMENT TOWARD THE TREND TOWARD AMPLITUDE WITH THIS
FEATURE...ESPECIALLY IN DETERMINISTIC GUIDANCE FROM THE 06 UTC GFS
AND 00 UTC ECMWF AND TO A LESSER EXTENT THEIR ENSEMBLE MEANS...HAS
IMPROVED CONFIDENCE A LITTLE IN THE IDEA THAT THE AMPLIFYING
PLAINS/SE ENERGY MAY SEPARATE FROM NRN STREAM FLOW.  COLD LOW LVL
AIR IN PLACE OVER THE ERN CONUS ALONG WITH THE UNCERTAINTIES IN
SURROUNDING FLOW ALOFT FAVOR A RECENT TREND FOR A SOMEWHAT MORE
SUPPRESSED SFC TRACK THAN EARLIER RUNS.  WPC PROGS GO ALONG WITH
THIS POTENT TREND BUT FALL SHORT OF DETERMINISTIC GFS/EC GUIDANCE
IN LUE OF THE ENSEMBLE MEANS CONSIDERING LINGERING UNCERTAINTY. 
DEPENDING ON EXACT EVOLUTION THIS SYSTEM MAY PRODUCE SOME HVY RNFL
OVER PARTS OF THE GULF COAST/SOUTHEAST AND A POTENTIALLY QUITE
SIGNIFICANT WINTRY PCPN THREAT IN THE MORE NRN PART OF THE MSTR
SHIELD.

IN THE UNSEASONABLY COLD AIRMASS OVER THE CNTRL-ERN STATES...
EXPECT A BROAD AREA OF ANOMALIES REACHING 20-35F BELOW NORMAL ON
MON... ONLY SLIGHTLY LESS EXTREME ON TUE... AND 10-20F BELOW
NORMAL BY THU.  AT SOME LOCATIONS MIN/MAX TEMP READINGS WILL
LIKELY APPROACH OR REACH CALENDAR DAY RECORD COLD VALUES.  WELCOME
TO MARCH? IN LIKE A LION.

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Hello everyone,

This is Joe Renken of KOPN Weather bringing you the weekly long range discussion for the KOPN listening area. East Asia is showing a volatile weather pattern in the next 10 days. We have no fewer than 3 systems that will be impacting Japan. Look for stormy conditions on March 3rd and 4th, 8th and 9th, and then the 11th and 12th. In between these systems we will have quick cold shots with moderation following. My severe weather thoughts on the last storm will be in the TN/OH Valley.

The Bering Sea is showing a mixed bag of what’s going to happen. We first see the ridge that was over Alaska retrograde over the Bering Sea for a few days. This happens on the 4th and 5th of March, so look for a quick warm up roughly around March 24th and 25th. However, this high pressure continues to retrograde over to the East Siberia Sea of Northern Russia and, combined with a few sub-Aluetian lows, will bring the cold air back for the end of the month.

Don’t forget to get the word out about our long range forecasting on www.weather.kopn.org to your friends and family as it’s being noticed on the blogsphere.

 

Rossby wave correlation,we'll have to watch this mid month of March or around this time frame

 

http://www.spc.noaa.gov/exper/archive/event.php?date=20131117

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The 12z Euro continues to advertise a coastal storm for 3-6/7. Looks like the TRIAD east. But every storm in that spot has come back northwest this winter. Might be a bit late for that trend to be honest. CFS2 continues to paint a cold March. The pattern that we have been in all winter looks to perpetuate itself long term, +PNA. Next storm chance? Looks about ten days out. Climo will begin to limit everyone outside of the mountains very soon.

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