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Posted at 2:05 PM ET, 08/28/2009

Is Tropical Storm Danny a Threat to U.S. Coast?

By Greg Postel

Storm complicates busy Saturday in Boston area

* Flash Flood Watch Thru Tonight: D.C. Area Forecast | SkinsCast *
* Outside Now? Radar, Temps & More: Weather Wall | Lightning Map *
* Danny's Impact on the Beaches | Hurricane Tracking Center *


Latest National Hurricane Center forecast track, as of 2 p.m. Friday, for Tropical Storm Danny. Enlarge.

By Greg Postel, Hurricane Expert

Tropical Storm Danny represents, at most, a relatively minor threat to most of the East Coast. It should be a near-miss for much of the mid-Atlantic except for a possible graze of the Outer Banks of North Carolina tonight, and should primarily impact eastern New England tomorrow.

It remains a highly disorganized, semi-tropical system that will not likely become a hurricane. Though it looks more like a small No'reaster with taller clouds, it does contain gusty winds in the 35-45 mph range and plenty of heavy-rain-producing thunderstorms.

Keep reading for more on Danny and its potential East Coast impacts...


Visible satellite image of Tropical Storm Danny, now about 350 miles south of Cape Hatteras, N.C., from 10:15 a.m. this morning. Courtesy NOAA.

The center of Danny will likely pass east of Cape Hatteras, N.C., very early Saturday (by 150 miles or so), and make a close encounter with the southeast coast of Massachusetts late Saturday night/early Sunday morning. A Tropical Storm Watch is in effect along the North Carolina coast from Cape Lookout northward to Duck, though winds are likely to remain below tropical storm strength, which starts at 39 mph.

The fact remains that Danny's worst weather is displaced well east of the circulation center, and will in all likelihood stay offshore. Unlike the tightly wound cluster of thunderstorms we typically see near the center of tropical systems, Danny's main thunderstorm activity is displaced well east of its spiral center, which can be seen near 30N/75.5W in the satellite picture above.

In addition, a strong low-pressure system that will approach the East Coast from the west on Saturday will so effectively destroy whatever tropical character Danny still possesses that the circulation will quickly devolve into an stretched-out batch of rain. In fact, Danny will probably become indistinguishable from the incoming low-pressure system.

During the merger of the two systems, the resulting system will potentially produce heavy rains and gusty winds for Maine and eastern Massachusetts on Saturday, including the Boston area where a host of activities are taking place, including Senator Edward M. Kennedy's funeral, a Red Sox game, a festival and the return of many college students.

Click here for the latest on Danny's potential impacts on the Maryland and Delaware beaches, and other locations along the East Coast.

By Greg Postel  | August 28, 2009; 2:05 PM ET
Categories:  Tropical Weather  
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Next: PM Update: Periods of Rain Lead to Flood Threat

Comments

So a tolerable beach day in Ocean City on Saturday?

I'm going to be surfing and boogie boarding, but like to chill on the beach between sessions. So if it's not raining (steadily, passing shower or two is tolerable) or too windy, it's a tolerable beach day.

Good beach days have sun. ;)

Posted by: wiredog | August 28, 2009 11:55 AM | Report abuse

Frequent lightning and very heavy rain in West Springfield 12:02pm+

Posted by: bikerjohn | August 28, 2009 12:04 PM | Report abuse

@wiredog:

Re: tolerable day at the beach Saturday? See this link: http://voices.washingtonpost.com/capitalweathergang/2009/08/forecast_cooler_yet_moister_th.html#beaches

Bottom line: Probably yes- I would guess sun out by late morning.

Posted by: CapitalWeatherGang | August 28, 2009 1:09 PM | Report abuse

Classic DC-split going on today!

Posted by: jfva | August 28, 2009 2:07 PM | Report abuse

Thanks!

Posted by: wiredog | August 28, 2009 2:50 PM | Report abuse

How can all of that yellow and dark green pass over my house without a drop falling?

Posted by: MKadyman | August 28, 2009 4:11 PM | Report abuse

Wiredog:

You may want to take fins with you. Last week, the OCBP wouldn't let anyone past the breakers unless they had a board AND fins. Mean riptides, but awesome waves!

Posted by: suntan | August 28, 2009 4:20 PM | Report abuse

New England braces for tropical weather -- again
----------------------------------------------

is this one named MARY JO

Posted by: JWx2 | August 28, 2009 9:22 PM | Report abuse

The comments to this entry are closed.

 
 
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