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Fall 2015 Pattern Discussion


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The GFS from a couple of days back was showing a potential cool down in the 7-8 day range. Now (of course) it's showing a warm pattern. Important thing is the north is cooling down. We'll just have to be patent until it can work itself southward.  

 

Day 7:

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2015&model_mm=09&model_dd=01&model_init_hh=06&fhour=180&parameter=TMPF&level=2&unit=M_ABOVE_GROUND&maximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false

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The GFS from a couple of days back was showing a potential cool down in the 7-8 day range. Now (of course) it's showing a warm pattern. Important thing is the north is cooling down. We'll just have to be patent until it can work itself southward.

Day 7:

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2015&model_mm=09&model_dd=01&model_init_hh=06&fhour=180&parameter=TMPF&level=2&unit=M_ABOVE_GROUND&maximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false

we just have to be patient. It will get here eventually.
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we just have to be patient. It will get here eventually.

 

Probably by the end of October.....

 

My prediction for this fall is that the leaves will come of the trees and it won't rain.  ;)

 

The real question is when will we see our first under 80° day.  My guess is the first week of October.  Then we will have our typical hot weather come back for a couple weeks then it will be mercifully over.

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Probably by the end of October.....

 

My prediction for this fall is that the leaves will come of the trees and it won't rain.  ;)

 

The real question is when will we see our first under 80° day.  My guess is the first week of October.  Then we will have our typical hot weather come back for a couple weeks then it will be mercifully over.

You mean first under 80 day with full sunshine. I'm sure we'll have a cloudy day between now and the end of the month where it doesnt get out of the 70s.

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Not bad for early September:

 

.LONG TERM /FRIDAY THROUGH TUESDAY/...
AS OF 305 AM WEDNESDAY...

FRIDAY THROUGH SATURDAY NIGHT: A BACKDOOR COLD FRONT WILL SINK
SOUTHWARD THROUGH THE AREA ON FRIDAY INTO FRIDAY EVENING AS ANOTHER
WEAK IMPULSE IN THE NORTH-NORTHWEST TO NORTHWESTERLY MID LEVEL FLOW
MOVES ACROSS THE AREA. THIS WILL TRIGGER AT LEAST ISOLATED TO
SCATTERED SHOWERS AND SOME STORMS FRIDAY AFTERNOON INTO THE EVENING.
OVERALL DEEP FLOW CONTINUES TO BE QUITE WEAK. GIVEN THIS AND RATHER
WEAK TO MODEST INSTABILITY EXPECT LITTLE IN THE WAY OF A SEVERE
THREAT... WITH THE ONLY LIMITED THREAT FROM LOCALIZED.... MAINLY
URBAN... FLOODING AS PW/S ARE EXPECTED TO BE AROUND 1.75" OR SO ON
FRIDAY. HIGH TEMPS FRIDAY IN ADVANCE OF THE FRONT ARE EXPECTED TO
REACH INTO THE UPPER 80S TO LOWER 90S. SURFACE HIGH PRESSURE WILL
BUILD INTO THE AREA FROM THE NORTH/NORTHEAST ON FRIDAY NIGHT INTO
SATURDAY. HOWEVER... WE WILL LIKELY SEE SOME LINGERING PRECIP
CHANCES AS A WEAK MID LEVEL LOW DEVELOPS JUST TO THE SOUTH OF THE
AREA. THUS... EXPECT LOW POPS (SLIGHT CHANCE) IN THE NORTHEAST...
WITH THE HIGHEST POPS (CHANCE) IN THE SOUTHWEST. GIVEN NORTHEAST TO
EASTERLY LOW LEVEL FLOW... WE WILL LIKELY START THE DAY WITH A GOOD
BIT OF CLOUD COVER/LOW STRATUS. GIVEN THE COOLER AIR MASS FROM THE
NORTH AND EXPECTED CLOUD COVER... WILL GO WITH HIGHS ON SATURDAY IN
THE LOWER TO MID 80S (AND THIS MAY STILL BE TOO WARM IN SPOTS).
LOWS
SATURDAY MORNING ARE EXPECTED TO BE IN THE UPPER 60S AND IN THE MID
TO UPPER 60S SUNDAY MORNING.

SUNDAY THROUGH TUESDAY: THE WEAK MID LEVEL LOW WILL CONTINUE TO
LINGER ACROSS THE SOUTHEAST U.S. DURING THIS TIMEFRAME WHILE SLOWLY
SINKING SOUTHWESTWARD... YET STILL EXTENDING INTO OUR AREA... ALONG
WITH AN INVERTED SURFACE TROUGH NEAR THE COAST TO EASTERN PORTIONS
OF OUR AREA. THIS WILL GENERALLY RESULT IN THE BEST CHANCES FOR
PRECIP TO THE SOUTH OF OUR AREA... BUT WE COULD SEE SOME ISOLATED TO
SCATTERED SHOWERS AND STORMS EACH DAY (MAINLY DIURNAL IN NATURE) AND
GENERALLY ACROSS EASTERN AND SOUTHEASTERN PORTIONS OF CENTRAL NC.
HIGHS WILL REMAIN IN THE 80S... COOLEST ON SUNDAY... WITH LOWS IN
THE 60S.

&&

 

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I'm liking this part of today's AFD

AS OF 245 AM SUNDAY...

IT APPEARS THAT THE CHANCES OF MUCH NEEDED RAINFALL SHOULD INCREASE 
ACROSS THE REGION BEGINNING WEDNESDAY... LASTING THROUGH FRIDAY AND 
POSSIBLY INTO THE WEEKEND.

Don't get your hopes up, Solak. By Tuesday, chances will be 20% for just Friday.

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Looking at the 6z GFS; it doesn't look hot across much of the south in the extended. Lots of 80s and even some 70s (possible upper 60s a couple of days) for highs. Problem, it looks like the fronts will not sweep totally out of the SE. This will allow more chances of rain (good), but the dew points never get to far below 60 (for most areas).

 

Rain is good but I'm looking for that first 70 degree, deep blue sky, low dew point day. Don't really see it right now...   

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Looking at the 6z GFS; it doesn't look hot across much of the south in the extended. Lots of 80s and even some 70s (possible upper 60s a couple of days) for highs. Problem, it looks like the fronts will not sweep totally out of the SE. This will allow more chances of rain (good), but the dew points never get to far below 60 (for most areas).

 

Rain is good but I'm looking for that first 70 degree, deep blue sky, low dew point day. Don't really see it right now...   

I would much rather have the rain. Been so dry.

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In the medium range, the12z GFS does have dew points dropping into the 40s for western portions of the SE; including most of GA. Easter parts of the SE will battle on low the dew points can drop.

 

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2015&model_mm=09&model_dd=08&model_init_hh=12&fhour=150&parameter=DPTF&level=2&unit=M_ABOVE_GROUND&maximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false

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HEADS UP Sat afternoon:

 

SATURDAY: THE LATEST 00Z GFS/ECMWF MODEL RUNS ARE NOW IN CLOSE
AGREEMENT WITH REGARD TO THE EVOLUTION OF THE UPPER LEVEL PATTERN
THROUGH 12Z SUN. THE AFOREMENTIONED UPPER LEVEL TROUGH WILL UNDERGO
FURTHER AMPLIFICATION ON SAT AS IT DIGS SOUTHEAST INTO THE OH/TN
VALLEY...WHERE A CLOSED LOW WILL FORM AND GRADUALLY TRANSLATE
EASTWARD INTO THE CENTRAL-SOUTHERN APPALACHIANS SAT NIGHT. AN
ATTENDANT SFC LOW IS PROGGED TO STRENGTHEN DIRECTLY OVER THE
CAROLINAS DURING THE DAY SAT. THE LOW WILL GRADUALLY TRACK NORTHWARD
INTO VIRGINIA SAT AFT/EVE BEFORE ACCELERATING INTO THE NORTHERN MID-
ATLANTIC SAT NIGHT. GIVEN PRONOUNCED SYNOPTIC FORCING AND SEASONABLE
MOISTURE/INSTABILITY...SCATTERED TO WIDESPREAD CONVECTION IS
EXPECTED SAT INTO SAT NIGHT. GUIDANCE HAS CERTAINLY TRENDED IN A
DIRECTION SUPPORTIVE OF SEVERE WEATHER SAT AFT/EVE. ALTHOUGH PRECISE
DETAILS (I.E. CONVECTIVE MODE/THREAT) REMAIN UNCLEAR AT THIS
RANGE...THERMODYNAMIC/KINEMATIC PROFILES WILL NO DOUBT BE SUPPORTIVE
OF SUPERCELLS. OMINOUSLY (PERHAPS)...THE #1 CIPS ANALOG TO THE 96-HR
FORECAST (VALID 00Z SUNDAY) FROM THE 00Z 09/09 GFS IS AUG 13 2004.
ON THAT DATE...A TORNADO OUTBREAK (INCLUDING 1 SIG TOR) AFFECTED
PORTIONS OF CENTRAL AND EASTERN NC.

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HEADS UP Sat afternoon:

 

SATURDAY: THE LATEST 00Z GFS/ECMWF MODEL RUNS ARE NOW IN CLOSE

AGREEMENT WITH REGARD TO THE EVOLUTION OF THE UPPER LEVEL PATTERN

THROUGH 12Z SUN. THE AFOREMENTIONED UPPER LEVEL TROUGH WILL UNDERGO

FURTHER AMPLIFICATION ON SAT AS IT DIGS SOUTHEAST INTO THE OH/TN

VALLEY...WHERE A CLOSED LOW WILL FORM AND GRADUALLY TRANSLATE

EASTWARD INTO THE CENTRAL-SOUTHERN APPALACHIANS SAT NIGHT. AN

ATTENDANT SFC LOW IS PROGGED TO STRENGTHEN DIRECTLY OVER THE

CAROLINAS DURING THE DAY SAT. THE LOW WILL GRADUALLY TRACK NORTHWARD

INTO VIRGINIA SAT AFT/EVE BEFORE ACCELERATING INTO THE NORTHERN MID-

ATLANTIC SAT NIGHT. GIVEN PRONOUNCED SYNOPTIC FORCING AND SEASONABLE

MOISTURE/INSTABILITY...SCATTERED TO WIDESPREAD CONVECTION IS

EXPECTED SAT INTO SAT NIGHT. GUIDANCE HAS CERTAINLY TRENDED IN A

DIRECTION SUPPORTIVE OF SEVERE WEATHER SAT AFT/EVE. ALTHOUGH PRECISE

DETAILS (I.E. CONVECTIVE MODE/THREAT) REMAIN UNCLEAR AT THIS

RANGE...THERMODYNAMIC/KINEMATIC PROFILES WILL NO DOUBT BE SUPPORTIVE

OF SUPERCELLS. OMINOUSLY (PERHAPS)...THE #1 CIPS ANALOG TO THE 96-HR

FORECAST (VALID 00Z SUNDAY) FROM THE 00Z 09/09 GFS IS AUG 13 2004.

ON THAT DATE...A TORNADO OUTBREAK (INCLUDING 1 SIG TOR) AFFECTED

PORTIONS OF CENTRAL AND EASTERN NC.

 

Thanks for the heads up. Sounds like something to keep an eye on for sure. Kids have soccer Saturday, so don't want to get caught off-guard with this.

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I can't find anything from RAH about a tornado outbreak on Aug 13, 2004. I did find something about severe weather on Aug 12 that year which produced one tornado in NC, and about hurricane Charley from Aug 9-15. 

Here's the event write-up for Aug 12th (should be the same event):

http://www4.ncsu.edu/~nwsfo/storage/cases/20040812/

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