500mb Disturbance after the Wednesday storm may ...

Winter Weather Discussion

Moderator: S2k Moderators

Forum rules

The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or STORM2K.

Help Support Storm2K
Message
Author
User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

500mb Disturbance after the Wednesday storm may ...

#1 Postby Stormsfury » Mon Dec 15, 2003 9:45 pm

bring upslope snows to the NC/TN Mountains and a few flurries to AL, GA, TN, and the Carolinas ...

It's right after this first storm system develops in the Southeast and bombs out over New England ... weak impulses riding the 500mb jet, including a potent little disturbance on Wed night/Thursday morning of this week could enhance upsloping and may spread a few flurries outside of the mountains in TN, AL, and GA ...

Funny discussion from Birmingham, AL today...

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE BIRMINGHAM AL
309 PM CST MON DEC 15 2003

CORRECTED FOR TOMORROW NIGHT CLARIFICATION

.SYNOPSIS...A COLD FRONT WILL MOVE THROUGH THE STATE ON TUESDAY BRINGING MAINLY LIGHT RAIN WITH IT. SOME AREAS NORTH AND EAST OF BIRMINGHAM WILL LIKELY SEE A MIX OF PRECIPITATION AFTER MIDNIGHT TUESDAY. NOTHING TO FRET OVER...BUT SOME BRIDGES AND OVER PASSES IN THE SAME MENTIONED AREAS MAY BE A LITTLE ICY ON WEDNESDAY MORNING.
&&

.DISCUSSION...NO TIME FOR CHIT-CHAT TODAY...I'M RUNNING WAY BEHIND. COLD FRONT MOVES THROUGH TOMORROW. FOLKS CAN EXPECT MAINLY LIGHT RAIN. THINGS GET A LITTLE MORE INTERESTING AFTER MIDNIGHT TUESDAY AS TEMPS DROPS INTO THE LOWER 30S. WILL LIKELY SEE A MIX NORTH AND EAST OF BIRMINGHAM. FOLKS AS FAR SOUTH AS MONTGOMERY MAY EVEN SEE "A"..."ONE"...SNOW FLAKE. DON'T RAID THE STORES. THERE IS SOME CONCERN FOR BRIDGES AND OVERPASSES HAVING SOME ICY PATCHES ON THEM WEDNESDAY MORNING...SO START SPREADING THE "BE CAREFUL DRIVING INFO".

THINGS KINDA COOL OUT AFTER THAT...GET IT? EXPECT MAINLY WEST-
NORTHWESTERLY WINDS AND SEASONAL TEMPS THROUGH THE WEEKEND. THE NEXT CHANCE OF RAIN IS ON MONDAY.

Excerpt from FFC ...

.SHORT TERM...
CLEAR SKIES CONTINUE INTO TONIGHT UNDER SURFACE HIGH PRESSURE AND WEAK RIDGING ALOFT. TEMPS SHOULD DROP QUICKLY THIS EVENING WITH MAXIMUM RADIATIONS COOLING. EXPECTING A MILD DAY TUESDAY WITH SOUTHERLY FLOW INCREASING THROUGH THE DAY AHEAD OF THE NEXT STORM SYSTEM. COLD FRONT PRESSES EASTWARD INTO GA TUESDAY EVENING BRINGING WITH IT BAND OF LIGHT RAIN TO PASS THROUGH THE AREA TUESDAY OVERNIGHT. STRONG COLD AIR ADVECTION AND BRISK NORTHWEST WINDS WEDNESDAY MORNING BEHIND FRONT WILL HOLD THROUGH THE DAY AND EXPECT TEMPS TO BE NEAR STEADY THROUGH THE DAY FROM THE MORNING LOWS. UPPER ENERGY BEHIND FRONT WILL SQUEEZE OUT REMAINING BIT OF MOISTURE AND THUS EXPECT FLURRIES ACROSS FAR NORTH GA...MAYBE AS FAR SOUTH AS A FEW NORTH METRO AREAS. BROAD UPPER TROUGH ACROSS EASTERN UNITED STATES REMAINS AS SECONDARY SPOKE OF UPPER ENERGY DIVES SOUTH ACROSS TN VALLEY ON THURSDAY WHICH ONCE AGAIN COULD PROVIDE A FEW SNOW SHOWERS ACROSS THE NORTHEAST GA MTNS.
OVERALL...MILD TUESDAY BEFORE MORE WINTER-LIKE WEATHER THE SECOND HALF OF THE WEEK.

And lastly, I hate it when CHS teases us here ...

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
145 PM EST MON DEC 15 2003

.PUBLIC...SURFACE HIGH PRESSURE WILL MOVE OFF THE COAST LATER
TONIGHT. WILL STILL CARRY SOME LIGHT FROST IN THE GRIDS FOR
PRIMARILY THE WESTERN MOST ZONES. SIGNIFICANT CHANGES BEGIN
TOMORROW AS HIGH SHIFTS OVER THE ATLANTIC AND A WARM SOUTHERLY WIND DEVELOPS ACROSS THE AREA. TEMPS WARMING INTO THE UPPER 60S IS LIKELY WITH MAYBE A SPOT 70 SOMEWHERE. THAT DEPENDS ON HOW MUCH HIGH CLOUD BEGINS TO ADVECT OVER THE REGION FROM THE NEXT APPROACHING STORM SYSTEM. STRONG LOW LEVEL JET WILL INCREASE TUE NIGHT AS THE CURRENT COLORADO STORM MOVES EAST ACROSS THE MS VALLEY. WEAK THETA-E RIDGE DEVELOPS TUE NIGHT WHICH MAY LEAD TO SOME SHOWER ACTIVITY BEFORE THE MAIN VORT CENTER AND LIFT MOVES ACROSS THE CWA
BETWEEN 06Z AND 15Z WED. WILL CONTINUE TO CARRY CHC POPS...BUT FORECAST QPF IS NOT VERY IMPRESSIVE WITH THIS FAST MOVING SYSTEM. WIND FIELDS ARE EXTREMELY IMPRESSIVE WITH THIS 38UNIT VORT CENTER MOVING ACROSS...WITH 45KT 925 MB WINDS FORECAST BY THE ETA THU 00Z. WIND ADVISORIES ARE A POSSIBILITY WED AFT AND EVENING ESPECIAlLY IF WE CLEAR OUT PRIOR TO SUNDOWN. HAVE LEANED TO MORNING HIGH TEMPS ON WED WITH GOOD COLD AIR ADVECTION DURING THE DAY. STEADY OR SLIGHTLY
FALLING TEMPS DURING THE AFTERNOON ARE A FAIR BET. WILL DEFINITELY FEEL BRISK WITH THE STRONG GUSTY WINDS.

IN THE EXTENDED...TROFFING PATTERN OVER THE EASTERN HALF OF THE U.S. WILL KEEP THE AREA TEMPS BELOW NORMAL LIKELY THROUGH THE END OF THE WEEK. AFTER WAVE PUSHES THROUGH ON WED WITH GOOD COLD AIR ADVECTION...S/W TROF WILL DIG THROUGH THE OHIO VALLEY ON THU...BRINGING A REINFORCEMENT SHOT OF HIGH PRES. THICKNESSES WILL BE LOW ENOUGH FOR WINTER PRECIP ACROSS THE CAROLINAS...BUT TRACK OF STORM SHOULD KEEP ANY OF THIS LIGHT SNOWY MIX WELL TO OUR NORTH. OVER THE WEEKEND...ANOTHER TROF MOVING THROUGH THE GREAT LAKES ON
SATURDAY WILL BRING YET ANOTHER SFC HIGH DOWN FROM SOUTHERN CANADA ONTO THE EAST COAST. OVERALL THE PATTERN LOOKS COOL AND DRY DAYS 3-8.

&&

I picked up on that disturbance last night on my prognostic outlook featured on my website and the possibilities ... 8-)
Last edited by Stormsfury on Mon Dec 15, 2003 10:18 pm, edited 1 time in total.
0 likes   

User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#2 Postby Stormsfury » Mon Dec 15, 2003 9:50 pm

Continuing the thread ...

BOTH the GFS and the ETA have been picking up on a small s/w disturbance at the 500mb level BEHIND the main low and is beginning to be reflected on the QPF's (albeit light) ... yes, there's upsloping involved as HKY WX stated but look at the 500mb level on the ETA and GFS...

http://weather.cod.edu/forecast/loop.etaus500v2.html

http://weather.cod.edu/forecast/loop.avnNA500v.html

These will update above shortly (after the 00z runs are in tonight) ...

Again, the shortwave appears on the ETA at 42 hours in Western ND, and as the maps update ... it will rapidly drop towards the Southeast by Thursday ... it's by no mean, an intense event, but just a little winter weather teaser nonetheless for some areas in the Southeast ....

Image
0 likes   

QCWx
Tropical Storm
Tropical Storm
Posts: 200
Joined: Sat Nov 22, 2003 1:08 am
Location: Charlotte/Western Gaston Co. NC

#3 Postby QCWx » Mon Dec 15, 2003 9:53 pm

That thing may not be juiced up with moisture but it may be strong enough to wring out whatever is there.
0 likes   

Valkhorn
Category 1
Category 1
Posts: 492
Joined: Wed Sep 10, 2003 4:09 am
Contact:

#4 Postby Valkhorn » Mon Dec 15, 2003 9:57 pm

Hehehe I love the local discussions by the National Weather Service. They're so entertaining, and my state puts out two a day.

It's great for local coverage :)
0 likes   

User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#5 Postby Stormsfury » Mon Dec 15, 2003 10:24 pm

QCWx wrote:That thing may not be juiced up with moisture but it may be strong enough to wring out whatever is there.


Yep ...

66hr ETA 00z 12/16/03

Image
0 likes   

Upslope
Tropical Low
Tropical Low
Posts: 46
Joined: Sat Nov 15, 2003 11:53 pm
Location: Bluegrass Country

#6 Postby Upslope » Mon Dec 15, 2003 11:06 pm

Stormsfury,

Great catch! I posted somewhat on this idea on WWBB and it got very little attention! Imagine that.

We are seeing a definate strengthing with the models in regards to our Wed-Fri clipper. It would appear a swath of 2-4 inch snow may be down from the upper midwest into the OV and TV.

The favored UPSLOPE areas may see local amounts of 4"+ across TN, KY, VA and WV.

How sharply does this turn the corner once it get's into the MA? That's something to watch for as the ETA develops a low pressure just off the coast.

I also believe this coming weekends clipper will drop farther southward than advertised. Especially if the first one carves out a slightly deeper trough.
0 likes   

User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#7 Postby Stormsfury » Mon Dec 15, 2003 11:11 pm

Upslope wrote:Stormsfury,

Great catch! I posted somewhat on this idea on WWBB and it got very little attention! Imagine that.

We are seeing a definate strengthing with the models in regards to our Wed-Fri clipper. It would appear a swath of 2-4 inch snow may be down from the upper midwest into the OV and TV.

The favored UPSLOPE areas may see local amounts of 4"+ across TN, KY, VA and WV.

How sharply does this turn the corner once it get's into the MA? That's something to watch for as the ETA develops a low pressure just off the coast.

I also believe this coming weekends clipper will drop farther southward than advertised. Especially if the first one carves out a slightly deeper trough.


I posted this about the disturbance last night on my website and it also got very little attention ... thanks for noticing. This little clipper type system is quite potent to say the least on the 500mb vorticity maps ... and also I've noticed the 00z ETA is further EAST with the main low ...

Also notice that the first low is on track to become a temporary PV as it spirals back to the NNW and should end up in a position over Hudson Bay in about 6-7 days ... (something else I posted on several days back) ...

And that's what should set up the nice confluent zone and set the stage for the next storm ...

This gets more and more interesting as we head towards Christmas ...

SF
0 likes   

Upslope
Tropical Low
Tropical Low
Posts: 46
Joined: Sat Nov 15, 2003 11:53 pm
Location: Bluegrass Country

#8 Postby Upslope » Mon Dec 15, 2003 11:13 pm

It's a very fun pattern!

Check out Tonight's Canadian.... BOOM for Christmas week!!!!!!
0 likes   

Valkhorn
Category 1
Category 1
Posts: 492
Joined: Wed Sep 10, 2003 4:09 am
Contact:

#9 Postby Valkhorn » Tue Dec 16, 2003 1:35 am

Definately. When any local mets announce the possibility for flurries in MS they reserve it for when they're serious about it.

I can tell you our December has been 7 degrees below average so far, and even with a slight warming trend we'll still be well below norms.
0 likes   

GAStorm
Category 1
Category 1
Posts: 364
Joined: Mon Dec 16, 2002 5:26 pm
Location: Marietta, GA

#10 Postby GAStorm » Tue Dec 16, 2003 3:19 pm

Thanks for the post SF! Looks like we will at least see flurries or even snow showers out of this in N GA. The GA and NC mountains are getting this just in time for holiday skiing. I hope this is a sign for things to come next week! :D
0 likes   

wrkh99

#11 Postby wrkh99 » Tue Dec 16, 2003 3:31 pm

WOW snow only 4 hours from me



ROAD TRIP
0 likes   

Upslope
Tropical Low
Tropical Low
Posts: 46
Joined: Sat Nov 15, 2003 11:53 pm
Location: Bluegrass Country

#12 Postby Upslope » Wed Dec 17, 2003 4:00 pm

Well, it looks like our clipper system that some of us were picking up on several days ago is coming on strong.

Snow advisories and even winter storm watches are posted in it's path into the OV and TV. I expect a general 2-4" in much of the lower OV and east TV with 4+ for the mountains!

I love these systems!
0 likes   

User avatar
therock1811
Category 5
Category 5
Posts: 5163
Age: 39
Joined: Thu May 15, 2003 2:15 pm
Location: Kentucky
Contact:

#13 Postby therock1811 » Wed Dec 17, 2003 4:08 pm

Does this include me Upslope?
0 likes   

Upslope
Tropical Low
Tropical Low
Posts: 46
Joined: Sat Nov 15, 2003 11:53 pm
Location: Bluegrass Country

#14 Postby Upslope » Wed Dec 17, 2003 4:19 pm

You are likely to be more closer to 2" that the 4" farther to your south! If we didn't have a high across Texas, gulf moisture would get involved and give us a bigger snow. That's not the case, though.

Still, this isn't bad for this clipper!
0 likes   

User avatar
therock1811
Category 5
Category 5
Posts: 5163
Age: 39
Joined: Thu May 15, 2003 2:15 pm
Location: Kentucky
Contact:

#15 Postby therock1811 » Wed Dec 17, 2003 4:26 pm

Ok...just wondering...I really do not want to wind up having to take the 2 exams I have to take tomorrow on Friday...
0 likes   

User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#16 Postby Stormsfury » Wed Dec 17, 2003 9:01 pm

The clipper system looks to give the favored upslope areas of TN/NC a healthy shot of snow as well and prolonged at that ... I believe winter storm watches have already been posted for portions of GSP's CWA ... in fact, they're already up ...

Image
0 likes   

Upslope
Tropical Low
Tropical Low
Posts: 46
Joined: Sat Nov 15, 2003 11:53 pm
Location: Bluegrass Country

#17 Postby Upslope » Wed Dec 17, 2003 10:58 pm

As we have discussed for a few days now, this is shaping up to be a very nice snow producing clipper for the OV and TV!


http://weather.unisys.com/eta/misc/eta_cum_snow.html[/url]
0 likes   

User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#18 Postby Stormsfury » Wed Dec 17, 2003 11:01 pm

Whoa! ETA spitting out some greater than half a foot totals in the NC Mountains ...

Image
0 likes   

User avatar
2001kx
Tropical Storm
Tropical Storm
Posts: 156
Joined: Sat Nov 22, 2003 2:00 am
Location: 50 miles north west of st.college(C-PA)

#19 Postby 2001kx » Thu Dec 18, 2003 1:08 am

hey stormsfury
where do you get those maps(eta) from?got a link?
thanks
0 likes   


Return to “Winter Weather”

Who is online

Users browsing this forum: No registered users and 8 guests