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NOAA-NESDIS
Regional And Mesoscale Meteorology Team
Daily Satellite Discussion
Tuesday May 6, 1997 |
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Attention turned toward the New York City area as a line of storms moved through there today.
I determined the movement of the leading edge (283 Deg/ 39 KT) of the line with a few images and then ran an extrapolation
routine. What you can see above are the visible image that I used as a starting point and the last available
image at this writing. The leading edge of the cloud line passing through NJ
appears as an impressive feature. Other things to note are the very clear areas in advance of the line and the
character of the cumulus developing out ahead of the line. Careful examination through time shows the
increase in the depth and coverage of the cumulus field just prior to the line passing. This is indicative of the
instability and moisture which is available. Conversely, low clouds
appear in western New England in this image.
Now let's look at the area three hours later. You can see an impressive surge in cloudiness just to the
east of the tip of Long Island. Notice that the surging cloudiness is not high-level cloudiness but mid-
and lower-level clouds. To quickly confirm the relative height of the clouds at the leading edge, the cloud-top temperatures
from channel 4 (IR) were much warmer (which can be inferred to be lower) in this instance.
The movement of the leading edge of the line was extrapolated in this region through three hours.
Brian Motta
CIRA/FIRSTT
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