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July 16, 2023 Flooding & Tornado Potential


WxWatcher007
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The WPC has placed much of New England in a moderate risk of excessive rainfall. After a very wet July, we have PWATS between 2-3 SD and a boundary moving toward the region, bringing the risk of flash flooding. With anomalous shear, modest helicity, and low LCLs, there is a tornado threat as well with the SPC introducing a 2% tor risk. 

vi0EZm9.png

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Unusually large bounded region spans much of eastern PA/NY and most of NE … swept over by near/at historic PWAT air mass is modeled to be in nexus with positive sheer, while modest hgt falls along with subtle yet crucial +difluence in mid levels may yet couple to an accelerating wind max AOs 300+ mb U/A up the St Law ~ lay/lon

… the total manifold of all that gives an ominous cue for me. Current guidance is pushing climate thresholds for some of these concurrent metrics which strikes me as a favorable environment for ‘synergistic’ results. 

In short I’m inclined to believe the higher guidance 

… predetermining exact locations/strike axis presents certain challenges due to inherent model limitations in predictive skill wrt convective initiation and spatial distribution/interactivity 

For those with access to graphics by all means. 

I also believe this situation may warrant at least low risk for brief or  even rain-wrapped TVS

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Slight risk added for SNE with a 5% tor risk. 

   ...Mid Atlantic to New England...
   A very moist airmass is in place across the East Coast with 1.9 to
   2.2 inch PWAT values on most 00Z RAOBs and mid 70s dewpoints from
   the Carolinas to New England. Within this moist environment, SPC
   mesoanalysis suggests an uncapped ML parcel across much of New
   England early this morning which should remain through mid-day.
   Therefore, despite expansive cloud-cover and minimal surface
   heating, expect 1000-1500 J/kg MLCAPE across New England this
   morning. Across the same region, surface flow will strengthen
   somewhat in response to the developing surface cyclone. A 40 knot
   low-level jet will develop and overspread New England between 12Z
   and 18Z. This will yield 0-500m SRH around 100 to 150 m2/s2 with
   clockwise curvature in the lowest 1km. Given the moist profile,
   lapse rates will be very poor which may result in relatively weak
   updrafts. However, if stronger, sustained updrafts can develop, a
   couple of tornadoes are possible across portions of New England,
   primarily before 17Z. 
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Tornado Warning
NYC111-160915-
/O.NEW.KALY.TO.W.0005.230716T0850Z-230716T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Albany NY
450 AM EDT Sun Jul 16 2023

The National Weather Service in Albany has issued a

* Tornado Warning for...
  Northeastern Ulster County in east central New York...

* Until 515 AM EDT.

* At 450 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Hurley, or near Kingston, moving northeast at 20
  mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.
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2 hours ago, ineedsnow said:
Tornado Warning
NYC111-160915-
/O.NEW.KALY.TO.W.0005.230716T0850Z-230716T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Albany NY
450 AM EDT Sun Jul 16 2023

The National Weather Service in Albany has issued a

* Tornado Warning for...
  Northeastern Ulster County in east central New York...

* Until 515 AM EDT.

* At 450 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Hurley, or near Kingston, moving northeast at 20
  mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

Just noticed this thread... I'm in Kingston and woke up to WEA tornado warnings about 25 mins ago.  Fully embedded couplet was easy to track over time.  Missed me to the west a bit but it wouldn't surprise me if there were some light damage in town somewhere.

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