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October 2018 Discussions & Observations Thread


Rtd208

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Tor warning just north of KPOU

 

Tornado Warning

Tornado Warning
NYC027-021900-
/O.NEW.KALY.TO.W.0008.181002T1841Z-181002T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Albany NY
241 PM EDT TUE OCT 2 2018

The National Weather Service in Albany has issued a

* Tornado Warning for...
  Central Dutchess County in east central New York...

* Until 300 PM EDT.

* At 241 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Pleasant Valley, or near Poughkeepsie, moving east
  at 30 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  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.

* This dangerous storm will be near...
  Pleasant Valley around 245 PM EDT.
  Millbrook and Stanfordville around 300 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Littlerest, Salt Point, Norrie Heights, McIntyre, Market, Netherwood,
Millbrook Heights, Haviland, Stissing and South Millbrook.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

Please report hail size...damaging winds and reports of trees down to
the National Weather Service by email at [email protected]...
On Facebook at www.facebook.com/nwsalbany or twitter @nwsalbany
&&

LAT...LON 4174 7392 4184 7393 4192 7365 4174 7363
TIME...MOT...LOC 1841Z 263DEG 26KT 4178 7386

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Frugis

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Mesoscale Discussion 1512
   NWS Storm Prediction Center Norman OK
   0210 PM CDT Tue Oct 02 2018

   Areas affected...Northern New Jersey...Southeast New York...Southern
   New England

   Concerning...Severe potential...Watch possible 

   Valid 021910Z - 022115Z

   Probability of Watch Issuance...40 percent

   SUMMARY...A wind damage threat and marginal tornado threat will be
   possible this afternoon from northern New Jersey northeastward into
   southern New England. Weather watch issuance can not be ruled out
   across the region.

   DISCUSSION...The latest surface analysis shows a warm front located
   from southeast New York extending eastward across Connecticut.
   Convection is developing near the boundary in southeast New York
   along the leading edge of a band of large-scale ascent evident on
   water vapor imagery. Ahead of the convection, surface dewpoints in
   the New York Vicinity and in far southern New England are generally
   in the mid to upper 60s F which is contributing to the development
   of weak instability. In addition, regional WSR-88D VWPs at Boston
   and New York City have moderate to strong deep-layer shear with 0-3
   km storm relative helicity around 250 m2/s2. This may be enough for
   a marginal tornado threat with cells that interact with the warm
   front. Wind damage will also be possible but the threat should
   remain isolated due to the weak instability.

   ..Broyles/Guyer.. 10/02/2018

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...BOX...OKX...ALY...PHI...BGM...
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Another crappy job by SPC with respect to a northeastern tor outbreak.  I mean, its not the plains or Dixie Alley, but they can't just use parameters developed 1500 miles away and apply them up here and call it a day.  They do amazing work in the core severe regions but it really falls off up here - I almost wonder if local offices couldn't do a better job.

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Just now, Drz1111 said:

Another crappy job by SPC with respect to a northeastern tor outbreak.  I mean, its not the plains or Dixie Alley, but they can't just use parameters developed 1500 miles away and apply them up here and call it a day.  They do amazing work in the core severe regions but it really falls off up here - I almost wonder if local offices couldn't do a better job.

I've always wondered about this. The few moderate days we get usually disappoint and the worst outbreaks I can remember have come on slight risk days.

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2 minutes ago, Gravity Wave said:

I've always wondered about this. The few moderate days we get usually disappoint and the worst outbreaks I can remember have come on slight risk days.

It's just not their strength.  I count 6 ongoing supercells with tight LL rotation, and the watch was issued after the first tornado was already on the ground.  C+ job by SPC.

Someone could do a nice masters thesis developing a parameter driven index like SigTor that's tuned for the Northeast.

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The cell about to cross the Hudson around Peekskill looks a bit threatening.  Pretty much any updraft near the front that can maintain itself is eventually spinning up a low level meso.  Lots and lots of storm relative helicity to work with, and just enough bulk shear to permit sustained updrafts.

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Finally, and sorry for the post-burst, but I am slammed at work and hadn't been following this at all.  I didn't even look at the radar / forecast until I looked out a conference room window at about 245PM and saw obvious, visible, low-level shear and increasingly deep convective clouds.  I thought "huh, this looks tornado-ish" and pulled up radarscope.

Eyeballs on the ground had a better lead time than SPC.  Forecast fail.

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Peekskill storm now TOR warned.  Seems a bit early for that, but given how the storms have evolved upstream, I can see why they want to get ahead of it.

FWIW, the earlier Millbrook spinner had a brief CC drop/TDS associated with it; wouldn't surprise me if there was an weak tornado sucking some leaves.

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14 minutes ago, Gravity Wave said:

I've always wondered about this. The few moderate days we get usually disappoint and the worst outbreaks I can remember have come on slight risk days.

I think the reason for that is simply because there are way way more slight risk days than moderate risk days. Although moderate risk days have a much higher probability of severe weather than slight risk days comparatively speaking, the probability on those moderate risk days is still not terribly high in absolute terms.

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5 minutes ago, Hoosier said:

I think the reason for that is simply because there are way way more slight risk days than moderate risk days. Although moderate risk days have a much higher probability of severe weather than slight risk days comparatively speaking, the probability on those moderate risk days is still not terribly high in absolute terms.

I disagree.  While F3 or stronger tornado in the NE tend to happen on plains-style days with an EML and good lapse rates,  weaker tornados are more frequent (duh), correlate with late season warm front events, and are often missed by SPC.  This is what they're screwing up.  Today is particularly bad because we have both a warm front and decent lapse rates.

 

It's like they forget that in August-October, you often lose the marine layer and warm fronts need to be watched like a hawk for surface-rooted convection.

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Severe Weather Statement
National Weather Service New York NY
431 PM EDT TUE OCT 2 2018

NYC087-119-022045-
/O.CON.KOKX.TO.W.0005.000000T0000Z-181002T2045Z/
Westchester NY-Rockland NY-
431 PM EDT TUE OCT 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR NORTHERN
WESTCHESTER AND ROCKLAND COUNTIES...

At 431 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Haverstraw, moving east at 15 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

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...
Peekskill, Stony Point, West Haverstraw, Croton-on-Hudson, Mount Ivy,
Thiells and Buchanan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4119 7384 4119 7403 4124 7403 4129 7395
      4132 7385
TIME...MOT...LOC 2031Z 273DEG 15KT 4123 7392

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$
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Tornado Warning
NYC119-022115-
/O.NEW.KOKX.TO.W.0006.181002T2043Z-181002T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
443 PM EDT TUE OCT 2 2018

The National Weather Service in Upton NY has issued a

* Tornado Warning for...
  Northern Westchester County in southeastern New York...

* Until 515 PM EDT.

* At 443 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Yorktown Heights, or near Mount Kisco, moving east
  at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  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.

* This dangerous storm will be near...
  Mount Kisco around 455 PM EDT.
  Bedford around 505 PM EDT.
  Greenwich around 510 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4131 7355 4118 7356 4111 7370 4113 7389
      4115 7389 4116 7391 4119 7392 4131 7390
TIME...MOT...LOC 2043Z 275DEG 19KT 4122 7382
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TORNADO WATCH OUTLINE UPDATE FOR WT 394
NWS STORM PREDICTION CENTER NORMAN OK
455 PM EDT TUE OCT 2 2018

TORNADO WATCH 394 IS IN EFFECT UNTIL 1200 AM EDT FOR THE
 FOLLOWING LOCATIONS

CTC001-005-030400-
/O.NEW.KWNS.TO.A.0394.181002T2055Z-181003T0400Z/

CT
.    CONNECTICUT COUNTIES INCLUDED ARE

FAIRFIELD            LITCHFIELD
$$

TORNADO WATCH OUTLINE UPDATE FOR WT 394
NWS STORM PREDICTION CENTER NORMAN OK
455 PM EDT TUE OCT 2 2018

TORNADO WATCH 394 IS IN EFFECT UNTIL 1200 AM EDT FOR THE
 FOLLOWING LOCATIONS

NJC003-013-027-031-037-041-030400-
/O.NEW.KWNS.TO.A.0394.181002T2055Z-181003T0400Z/

NJ
.    NEW JERSEY COUNTIES INCLUDED ARE

BERGEN               ESSEX               MORRIS
PASSAIC              SUSSEX              WARREN
$$

TORNADO WATCH OUTLINE UPDATE FOR WT 394
NWS STORM PREDICTION CENTER NORMAN OK
455 PM EDT TUE OCT 2 2018

TORNADO WATCH 394 IS IN EFFECT UNTIL 1200 AM EDT FOR THE
 FOLLOWING LOCATIONS

NYC027-071-079-087-111-119-030400-
/O.NEW.KWNS.TO.A.0394.181002T2055Z-181003T0400Z/

NY
.    NEW YORK COUNTIES INCLUDED ARE

DUTCHESS             ORANGE              PUTNAM
ROCKLAND             ULSTER              WESTCHESTER
$$


ATTN...WFO...OKX...ALY...PHI...
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