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July 2013 Observations and Discussions


bluewave

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Guest Pamela

Mt Sinai reporting 0.40" rain from the storms moving through so far.

 

Edit: Now at 0.91".

 

Later last evening, after about 9:00 PM, a second round of showers & t-storms moved through the area, putting down another 1.4" or rain, for about 2.3 inches of rain since late in the afternoon and about 2.8" in the previous 24 hours for the Port Jeff / Mt Sinai area. 

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Assuming TD #4 holds together it should be approaching the Bahamas in about 7-10 days. That would be a danger zone for us.

I don't think TD 4 will be the real threat given conditions will never be too favorable for any significant strengthening, it's what will follow that I would be concerned about.

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I don't think TD 4 will be the real threat given conditions will never be too favorable for any significant strengthening, it's what will follow that I would be concerned about.

NHC forecast has a tropical storm NE of PR on Monday. Conditions would be improving at that point and it would be entering an area of very warm SST's. Most of the models that had this dissipating had it doing do within the next 24-48 hours.

 

The name Dorian sounds like a beast. Hopefully that name produces something big.

 

084236W5_NL_sm.gif

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sort of

 

"Analysis by Bornstein and LeRoy (1990) has shown that New York City (NYC) affects both summer daytime thunderstorm formation and movement. During conditions with nearly calm regional flows, the NYC UHI initiated convective activity, thus producing a radar echo frequency maximum over the City. Moving thunderstorms, however, bifurcated and moved around the city due to a building-barrier-induced divergence effect. During such conditions, radar echo maxima were thus produced on both lateral edges of the City and downwind of the city, while a minimum was located over the city itself. 

 
The downwind maximum associated with moving convective storms is consistent with results from the classic METROMEX field study, which also showed a precipitation maximum downwind of St. Louis (Changnon, 1981). It is also consistent with the convective precipitation study of Selover (1997), which showed that moving summer convective storms over Phoenix, Arizona produce a precipitation minimum over the city in conjunction with surrounding lateral and downwind maximum values."
 

 

 

That's wild.

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NHC forecast has a tropical storm NE of PR on Monday. Conditions would be improving at that point and it would be entering an area of very warm SST's. Most of the models that had this dissipating had it doing do within the next 24-48 hours.

 

The name Dorian sounds like a beast. Hopefully that name produces something big.

 

084236W5_NL_sm.gif

 

Ahh Hurricane season....

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The main problem is going to be the shear with the TUTT north of Puerto Rico in 5 days.

 

attachicon.gif850200shear20.png

 

The NHC discussion mentions that, though it sounds like they're a bit unsure of the impacts associated with it.

 

THE INTENSITY FORECAST IS OF LOWER CONFIDENCE THAN THE TRACK

FORECAST.  ALTHOUGH THE SHEAR IS EXPECTED TO REMAIN LOW DURING THE

NEXT FEW DAYS...THE CYCLONE WILL BE MOVING OVER SLIGHTLY COOLER

WATERS AND INTO A LITTLE DRIER ENVIRONMENT OVER THE NEXT

DAY OR TWO.  THEREFORE...ONLY SLIGHT STRENGTHENING IS INDICATED

IN THE NHC FORECAST.  LATER IN THE FORECAST PERIOD...THE CYCLONE

IS EXPECTED TO APPROACH AN UPPER-LEVEL TROUGH OVER THE WEST-CENTRAL

ATLANTIC WHICH COULD CAUSE AN INCREASE IN SOUTHWESTERLY SHEAR.

BECAUSE OF THIS...THE NHC FORECAST SHOWS LITTLE CHANGE IN STRENGTH

DURING THE 3 TO 5 DAY TIME PERIOD.

 

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The NHC discussion mentions that, though it sounds like they're a bit unsure of the impacts associated with it.

 

THE INTENSITY FORECAST IS OF LOWER CONFIDENCE THAN THE TRACK

FORECAST.  ALTHOUGH THE SHEAR IS EXPECTED TO REMAIN LOW DURING THE

NEXT FEW DAYS...THE CYCLONE WILL BE MOVING OVER SLIGHTLY COOLER

WATERS AND INTO A LITTLE DRIER ENVIRONMENT OVER THE NEXT

DAY OR TWO.  THEREFORE...ONLY SLIGHT STRENGTHENING IS INDICATED

IN THE NHC FORECAST.  LATER IN THE FORECAST PERIOD...THE CYCLONE

IS EXPECTED TO APPROACH AN UPPER-LEVEL TROUGH OVER THE WEST-CENTRAL

ATLANTIC WHICH COULD CAUSE AN INCREASE IN SOUTHWESTERLY SHEAR.

BECAUSE OF THIS...THE NHC FORECAST SHOWS LITTLE CHANGE IN STRENGTH

DURING THE 3 TO 5 DAY TIME PERIOD.

 

 

You can see the GFS and Euro open it up back into a wave when it gets into that region.

 

http://moe.met.fsu.edu/cgi-bin/gfstc2.cgi?time=2013072406&field=Sea+Level+Pressure&hour=Animation

 

http://moe.met.fsu.edu/cgi-bin/ecmwf-opertc2.cgi?time=2013072400&field=Sea+Level+Pressure&hour=Animation

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NAEFS starting to pick up on warmer temperatures above 90 returning for early August.

 

attachicon.gif2013072400_054@007_E1_north@america_I_NAEFS@TEMPERATURE_anomaly@probability@combined@week2_198.png

 

 

It looks too influenced by the warm water. One can see w/ the above normal colors generously spread near the Great Lakes w/ the extension southeast through W NY State toward the Atlantic Ocean. The ECMWF ensembles generally keep the higher heights associated w/ the West Atlantic Ridge displaced further east over the next 6-10 days. Near to cooler than normal temperature anomalies are progged through early August on the ECMWF ensembles, with the mean trough axis in the Lakes, extending into much of the Northeast. Coastal New England might have some issues with the WAR, but for most of the Northeast, this looks like a near normal to slightly cooler than normal pattern through at least early August.

 

ECMWF ensembles out at 240.

 

awrst1.png

 

 

2l9pnuo.png

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