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Tracking the coastal storm, 11/11/09

9:01:54 AM: Rainfall is become focused along the central and southern New Jersey coast as high pressure and dry air presses south.

9:03:38 AM: Pressure falls continue to develop off the North Carolina coast extending through the Gulf Stream. A transition appears to be developing.

9:04:35 AM: Meanwhile, a more solid phase can be observed on the water vapor satellite as the upper level low with this storm moves ENE rather than E.

9:05:28 AM: The influences of the Bahamas disturbance clearly has forced this storm further north by building the western Atlantic ridge at 500 MB.

9:05:57 AM: As a result, the Polar disturbance is phasing with the Sub Tropical disturbance more completely than earlier expected.

9:06:23 AM: This is why the model guidance has trended and will continue to trend northward with the higher QPF.
9:10:12 AM: As the day continues, I expect the press down on precipitation to continue through NYC and approaching Philadelphia.

9:10:37 AM: However, as the dry air presses down, the rain along the New Jersey coast will intensify as moisture convergence increases.

9:11:12 AM: Southern and central New Jersey is in for a very wet couple of days. I will continue to update through the day via this medium.

9:11:56 AM: I’ll try for an update on thoughts at once every one to two hours, depending on circumstances of this event.

9:12:13 AM: As of now, I can say that the going thoughts from last night are working out very well.

11:07:48 AM: The rain is slowly stopping the southward trend of the early morning. Light to moderate rain will continue along the C and S NJ coast.

11:08:33 AM: The pressure gradient will increase through the day as the coastal low develops off NC.

1:23:27 PM: The new coastal low is offically taking shape off the central coast of NC where the wind vectors are rapidly converging and pressure falling

1:24:25 PM: Meanwhile cloud tops continue to rapidly cool over the northern Mid Atlantic as lifting at all levels increase.

1:25:31 PM: The increased lifting is due to the phasing of the Polar disturbance with the Sub Tropical disturbance.

1:27:01 PM: Rain is rebuilding northward and is expected to reach much of the Philadelphia metro and central NJ. Showers will in increase over NYC.

1:28:31 PM: Rain will increase in intensity over the C and S NJ coast along with sustained winds between 15 to 30 mph with higher gusts.

6:55:24 PM: Through this afternoon the storm has developed as expected as rain continued over southern NJ and PHL.

6:57:50 PM: This evening I will up grade to a new coverage format that will intergrate Twitter. The live coverage will begin between 8 and 8:30 PM.

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-- Weather When Posted --

  • Temperature: 53°F;
  • Humidity: 50%;
  • Heat Index: 53°F;
  • Wind Chill: 48°F;
  • Pressure: 30.3 in.;

8 Responses to “Tracking the coastal storm, 11/11/09”


  1. theweathergod2010

    Steve from what I am seeing the ECM also now moves the moisture further north and becomes quite wet for friday and saturday…

  2. theweathergod2010

    You have to find this a bit interesting…

    MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC

    AND ATLANTIC

    GLOBAL MODEL DATA TIME 12UTC 11.11.2009

    TROPICAL STORM DEVELOPED IN THE MODEL ANALYSIS AT POSITION : 26.1N
    66.5W

    VERIFYING TIME POSITION STRENGTH TENDENCY
    ————– ——– ——– ——–
    12UTC 11.11.2009 26.1N 66.5W WEAK
    00UTC 12.11.2009 28.3N 66.7W WEAK WEAKENING SLIGHTLY
    12UTC 12.11.2009 30.6N 66.0W WEAK LITTLE CHANGE
    00UTC 13.11.2009 BELOW TROPICAL STORM STRENGTH

    NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 24 HOURS
    FORECAST POSITION AT T+ 24 : 33.6N 77.0W

    VERIFYING TIME POSITION STRENGTH TENDENCY
    ————– ——– ——– ——–
    12UTC 12.11.2009 33.6N 77.0W MODERATE
    00UTC 13.11.2009 34.6N 76.0W MODERATE INTENSIFYING SLIGHTLY
    12UTC 13.11.2009 33.6N 76.0W STRONG INTENSIFYING SLIGHTLY
    00UTC 14.11.2009 33.0N 75.0W MODERATE WEAKENING SLIGHTLY
    12UTC 14.11.2009 32.6N 73.0W WEAK WEAKENING SLIGHTLY
    00UTC 15.11.2009 31.6N 71.0W WEAK WEAKENING SLIGHTLY
    12UTC 15.11.2009 31.0N 69.5W WEAK LITTLE CHANGE
    00UTC 16.11.2009 BELOW TROPICAL STORM STRENGTH

    THIS INFORMATION IS PROVIDED AS GUIDANCE FOR TROPICAL CYCLONE
    RSMCS. IT REQUIRES INTERPRETATION BY TROPICAL CYCLONE SPECIALISTS
    AND SHOULD NOT BE CONSIDERED AS A FINAL PRODUCT

    MET OFFICE, EXETER, UK

  3. theweathergod2010

    Probably a minimal TS now

    MAXIMUM SUSTAINED WINDS ARE NEAR 45 MPH…70 KM/HR…WITH HIGHER
    GUSTS. THE MINIMUM CENTRAL PRESSURE IS 1003 MB…29.62 INCHES.

  4. blizzard93

    steve it really sucks here in nyc metro watching all the excitement to the south
    is there any way i can get in some of the action?

  5. blizzard93

    theres another ts????!!!!!

  6. Steven DiMartino

    Hybrid storm. This is not a pure warm core low pressure system.

  7. Steven DiMartino

    Wait until Friday night or take one care down RT 9 to ACY for some stormy conditions and excellent black jack!

  8. Steven DiMartino

    Very interesting indeed. I will address this tonight.



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