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August 2013 Observations And Discussions


bluewave

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It still drops .74" of rain on NYC from 6z to 18z.

With the majority of it 12z to 15z.

 

If the low comes a little further north, we'll get into the heavy stuff. It may end up being another

nowcast special once we see the actual radar tomorrow. 

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The RAP shows the weak low pressure developing in Central PA Tuesday morning and moving east along a warm front. The NAM also has some decent parameters between 12 and 15z as the low pressure passes nearby. I wonder if tomorrow could be a sneaky event where we see some wind damage reports and maybe the potential for some spinups along the front and near the sfc low.

 

http://www.meteo.psu.edu/~fxg1/RUCNE_18z/f12.gif

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You got to it before I did, was just going to post this. The ECMWF ensembles which saw the August cool are now beginning to see the light at the end of the tunnel w/ the retrograding WAR post 8/20. We'll have to see if the 12z ECM continues with that idea or it gets pushed back further, but over the past few weeks I've thought the last week of August would feature rapid warming in the Northeast, ultimately leading to the mean ridge position over the NE for the month of September. Long range guidance seems to suggest that right now. Even still, it's the ECMWF ensembles at 240hrs so I'd like to see another cycle or two of the WAR returning around / slightly after 8/20.

 

Prior to that time, a significant autumnal airmass heads for the Northeast 8/13-8/17 of this week, with 850mb temps near or below +10c for most northeast of DCA. Probably going to see a couple days or more with highs remaining in the 70s and lows in the 50s for suburbia (maybe 40s for far off suburbs). NYC does worse in radiational cooling regimes so they'll probably remain in the 60s. I expect most of the Northeast to have fairly significant negative departures going into the final 10 days of August. Those negatives will come up somewhat but not enough to make August normal or above normal IMO.

Seems like the 12z euro ens is already removing the Bermuda High and the heat that it brought in for the end if the month. I thought we would see a warm up going into sept over the weekend but by the looks of the 18z gfs it doesn't look like anything to get excited about. What do you guys think?

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Even if there's a retrograding WAR, the Below Average Tropical activity may be difficult to break, unless the active WAR relaxes the wind shear for a large portion of the Western Atlantic Ocean.

The periods of the intense SAL crossing the Atlantic has been a stifling factor as well. There also has been decreased instability in the TNA as a whole. We'll see what happens and what changes in September.

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FLOOD WATCH
NATIONAL WEATHER SERVICE NEW YORK NY
408 AM EDT TUE AUG 13 2013

...HEAVY RAIN EXPECTED TODAY WITH FLASH FLOODING POSSIBLE...


CTZ005-006-009-010-NJZ002-004-006-103>108-NYZ069>075-078>081-
176>179-132200-
/O.NEW.KOKX.FF.A.0007.130813T1000Z-130813T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-SOUTHERN FAIRFIELD-
SOUTHERN NEW HAVEN-WESTERN PASSAIC-EASTERN PASSAIC-HUDSON-
WESTERN BERGEN-EASTERN BERGEN-WESTERN ESSEX-EASTERN ESSEX-
WESTERN UNION-EASTERN UNION-ROCKLAND-NORTHERN WESTCHESTER-
SOUTHERN WESTCHESTER-NEW YORK (MANHATTAN)-BRONX-
RICHMOND (STATEN ISLAND)-KINGS (BROOKLYN)-NORTHWESTERN SUFFOLK-
NORTHEASTERN SUFFOLK-SOUTHWESTERN SUFFOLK-SOUTHEASTERN SUFFOLK-
NORTHERN QUEENS-NORTHERN NASSAU-SOUTHERN QUEENS-SOUTHERN NASSAU-
408 AM EDT TUE AUG 13 2013


* FLASH FLOOD WATCH FOR PORTIONS OF SOUTHERN CONNECTICUT...
NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK...INCLUDING THE
FOLLOWING AREAS...IN SOUTHERN CONNECTICUT...FAIRFIELD AND NEW
HAVEN COUNTIES. IN NORTHEAST NEW JERSEY...BERGEN...ESSEX...
HUDSON...PASSAIC AND UNION COUNTIES. IN SOUTHEAST NEW YORK...
ALL FIVE BOROUGHS OF NEW YORK CITY...ROCKLAND...WESTCHESTER...
NASSAU AND SUFFOLK COUNTIES.

* THROUGH THIS AFTERNOON.

* LOW PRESSURE MOVING NORTHEAST FROM THE MID ATLANTIC REGION AND
ITS ASSOCIATED WARM FRONT WILL ACT ON AN INCREASINGLY MOIST AND
UNSTABLE AIR MASS TO PRODUCE SHOWERS AND THUNDERSTORMS TODAY.
WIDESPREAD RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE LIKELY...WITH
LOCALIZED AMOUNTS OF OVER 3 INCHES POSSIBLE IN THE HEAVIEST
CELLS. THIS RAINFALL COULD OCCUR OVER A SHORT PERIOD OF
TIME...WITH RAINFALL RATES OF 1 TO 2 INCHES PER HOUR...AND CAUSE
FLASH FLOODING OF SMALL STREAMS AND URBAN...LOW LYING AND POOR
DRAINAGE AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP IN AND NEAR
THE WATCH AREA THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A
VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND
BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.

&&

$

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What are the chances of KNYC or any of the metro reporting stations hitting 59 tomorrow night? Gonna cool and dry out quick tomorrow.

Thursday might have a better chance with lighter winds... The passage of the front will ensure a brisk NW flow that downslopes NYC significantly, so I don't see 50s tomorrow night. Thursday morning is a better shot in my opinion.

This should be the most significant cool shot of the month with departures around -8F depending on how cold we get at night. Averages are starting to drop at Central Park and are no longer 85/70. Models have backed off the warmth now with a more modest West Atlantic Ridge but the breakdown of the PNA/western ridge pattern should bring hotter, drier air to the East. We haven't seen a "Sonoran" heat outbreak all summer as our positive departures were all from high humidity.

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50's in NYC during August is getting harder to come by...the long term average minimum is 57 but recent years have a higher average...

last 50's in August was 59 in 2011...

year...min...

2011...59

2008...58

2007...56

2000...57

1999...59

1998...58

1994...57

1992...57

1990...58

from 1965 to 1986 the all time record August minimum was tied four times...1965 had two mornings with a 50 degree minimum temperature and 51 the third day...it was quite a cold snap for late August...

1965...50

1976...50

1982...50

1986...50

the early 60's had very cool August low temps...

1962...56

1963...53

1964...54 two consecutive days...

1965...50 two consecutive days...

Newark's coolest August temps...

45 8/29/1982

47 8/31/1934

48 8/25/1940

48 8/29/1986

48 8/31/1976

49 8/30/1934

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