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Ghosts, Ghouls, Pumpkins, Autumn Chill?: October 2015 DISCUSSION/OBS


UnionWeatherWx

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True-and maybe that is the beginning..next few weeks will be interesting as we get deeper into fall.

We had a nice negative NAO regime that was completely screwed up by Joaquin. I would have loved to see what that ULL would have done without Joaquin in the picture. 

 

Now we're back to southeast ridging for the next two weeks. Will be nice to get some above average temps before the shoe drops the third week of October. 

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We had a nice negative NAO regime that was completely screwed up by Joaquin. I would have loved to see what that ULL would have done without Joaquin in the picture.

Now we're back to southeast ridging for the next two weeks. Will be nice to get some above average temps before the shoe drops the third week of October.

Yeah it should be nice, especially tomorrow and Wednesday in the 70s.
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According to Upton, don't even bother looking at other guidance for Fri/Sat

 

THERE ARE DIFFERENCES IN THE MODELS FOR THE SYSTEM FORECAST TO
IMPACT THE AREA FROM FRIDAY INTO POSSIBLY THE FIRST PART OF THE
WEEKEND. BASED ON ITS RECENT STELLAR PERFORMANCE...ITS HISTORICAL
TRACK RECORD...AND THAT IT HAS BEEN INDICATING A SECONDARY LOW
DEVELOPING OFF THE MID ATLANTIC COAST FOR AT LEAST 4 MODEL CYCLES
NOW...HAVE GENERALLY FAVORED THE ECMWF
FROM FRIDAY-SATURDAY NIGHT.

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According to Upton, don't even bother looking at other guidance for Fri/Sat

 

THERE ARE DIFFERENCES IN THE MODELS FOR THE SYSTEM FORECAST TO

IMPACT THE AREA FROM FRIDAY INTO POSSIBLY THE FIRST PART OF THE

WEEKEND. BASED ON ITS RECENT STELLAR PERFORMANCE...ITS HISTORICAL

TRACK RECORD...AND THAT IT HAS BEEN INDICATING A SECONDARY LOW

DEVELOPING OFF THE MID ATLANTIC COAST FOR AT LEAST 4 MODEL CYCLES

NOW...HAVE GENERALLY FAVORED THE ECMWF FROM FRIDAY-SATURDAY NIGHT.

Not really surprising that they are leaning towards the Euro after what happened with Joaquin, although relying on one model to always be 100% correct is not smart meteorology. 

 

The Euro has gotten progressively more amplified with the trough and has flirted with the idea of closing off some mid-level centers. Early to tell, but this could end up being a significant system for the area.

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Not really surprising that they are leaning towards the Euro after what happened with Joaquin, although relying on one model to always be 100% correct is not smart meteorology. 

 

The Euro has gotten progressively more amplified with the trough and has flirted with the idea of closing off some mid-level centers. Early to tell, but this could end up being a significant system for the area.

12z GFS and CMC still move it through by Sat AM, CMC is a bit slower, but still looks fairly progressive on both models.  12z Euro up next.

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12z Euro lost the idea of a slow frontal passage Friday night.

It now has a faster passage with just .10"-.25" of rain and nothing after 8pm Friday.

That's because it digs the trough deeper into the Southeast, so the energy goes further South. It's actually less progressive than prior runs.

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This is probably just a case of the Euro being dig happy. The strength and amplitude of the trough is such that if the energy is far enough North, it should deliver significant rain to our area. In this case, it closes off a 500mb low down in the Carolinas. Had that occurred further North, it would have been a really wet run for this region.

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The frontal passage on Friday with a weekend trough split and piece of energy cutting off

over the SE makes sense with the big PNA spike coming up. So we get a nice dry fall

weekend and wait and see what happens with the UL over the Southeast for next

week.

 

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Generally above normal for this time of year after the cooler start to the month.

The last Euro weekly update was showing the same thing continuing.

NEW YORK CITY-CENTRAL PARK KNYC   GFSX MOS GUIDANCE  10/07/2015  0000 UTC                        FHR  24| 36  48| 60  72| 84  96|108 120|132 144|156 168|180 192       WED  07| THU 08| FRI 09| SAT 10| SUN 11| MON 12| TUE 13| WED 14 CLIMO X/N  71| 59  67| 59  73| 57  62| 51  69| 56  73| 58  70| 56  67 49 65

 

 

Thanks.

 

Not a single below normal day in there.

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With a little luck, we are slowly in the process of turning this ship. The long range models went for a wetter than average

SON here. September was below, but the recent rains gave us a wetter start to October. You would expect our storm

chances to increase as the STJ comes to life for the remainder of the SON fall period.

 

attachicon.gifcaprec_anom.1.gif

The ULL low over the SW has produced a downstream positively tilted, trough over the Southeast making it difficult for systems dropping in to amplify and round the bend. Despite a rather strong shortwave on Friday, it should go to our South thanks to the relatively progressive flow.

 

There are some signs the ULL off the Carolina coast could interact with another trough dropping through the lakes, but so far we haven't seen anything definitive.

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