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Obs. : TROPICAL STORM Henri


DotRat_Wx
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11 minutes ago, Ginx snewx said:

 

Screenshot_20210823-115643_RadarScope.jpg

That couple of bins looks like bad data to me the way it pops in real quick on one volume scan and then is gone, but there has been broad/weak rotation in that cell (and now the one just east). 

I am intrigued by how the reports came in as the cell clearly became the tallest thing around (even though it's only 10,000 ft or so). Updraft surges like that can be enough. I actually like the velocity more around 11:15-11:25.

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Severe Weather Statement
National Weather Service Boston/Norton MA
1207 PM EDT Mon Aug 23 2021

MAC017-027-231630-
/O.CON.KBOX.TO.W.0005.000000T0000Z-210823T1630Z/
Worcester MA-Middlesex MA-
1207 PM EDT Mon Aug 23 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 PM EDT FOR EAST
CENTRAL WORCESTER AND CENTRAL MIDDLESEX COUNTIES...

At 1206 PM EDT, a confirmed tornado was located over Berlin, or near
Marlborough, moving north at 15 mph. This storm has had a history of
producing a brief tornado and could continue to produce brief
tornadoes.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado. At 1145 AM a tornado
         was reported west of I-495 in Marlborough.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows, and vehicles will occur.  Tree damage is
         likely.

Locations impacted include...
Marlborough, Hudson, Northborough, Clinton, Lancaster, Sterling,
Harvard, Boxborough, Bolton, Boylston and Berlin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

&&

LAT...LON 4232 7156 4231 7162 4245 7174 4249 7155
TIME...MOT...LOC 1603Z 174DEG 12KT 4240 7159

TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN
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19 minutes ago, OceanStWx said:

That couple of bins looks like bad data to me the way it pops in real quick on one volume scan and then is gone, but there has been broad/weak rotation in that cell (and now the one just east). 

I am intrigued by how the reports came in as the cell clearly became the tallest thing around (even though it's only 10,000 ft or so). Updraft surges like that can be enough. I actually like the velocity more around 11:15-11:25.

 

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36 minutes ago, OceanStWx said:

That couple of bins looks like bad data to me the way it pops in real quick on one volume scan and then is gone, but there has been broad/weak rotation in that cell (and now the one just east). 

I am intrigued by how the reports came in as the cell clearly became the tallest thing around (even though it's only 10,000 ft or so). Updraft surges like that can be enough. I actually like the velocity more around 11:15-11:25.

I'm right here in Ayer ...

Nimbus with fractal towers partially sundogged with trace glaciation over nimbus bottoms.   Light right in high DP torridity - no ground truth or rotation at the moment but will keep eyes pealed

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So here in Ayer ... no rotation was detectable to the unaided observer.

That said, there is a butt-load of shear in the lower 0 to 5km troposphere.

The scud fractals are moving pretty swiftly NW around and under the dark bellies of nimbus, with their broken partial glaciated tops are leaning NE.  One can see that it wouldn't take much to spin any updraft suspended through that column

Pretty classic low LCL over-lap with lower level directional shear environment out there.

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