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meatwad

Pittsburgh PA Spring and Summer 2020 Thread

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Tornado warning just issued coming into western PA from Ohio, portions of northern Washington and western Allegheny Counties.

You SW PA folks got quite the severe setup, at least on paper (Mesoanalysis). Surface CAPEs over 1500 and Mixed Layer capes near 1000 coupled with modest helicity and pretty good shear/lift are putting out EHI values and lighting up the tornado parameter products. I'd be very watchful of that line of storms as it presses into SW PA and also some potential discrete storms esp south of the city.

Of more immediate attention, the hook echo portion of the tornado warned storm looks to be taking aim at the southern suburbs of Pittsburgh eventually (Bethel Park, Mount Lebanon, etc). The north side of this cell likely has significant hail in it as well. Velocity isn't showing a concise couplet but the pronounced hook echo is definitely indicating rotation in this storm.

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Severe Thunderstorm Warning

Severe Thunderstorm Warning
PAC003-005-007-019-129-282045-
/O.NEW.KPBZ.SV.W.0020.200328T1956Z-200328T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
356 PM EDT Sat Mar 28 2020

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Eastern Beaver County in western Pennsylvania...
  Southern Butler County in west central Pennsylvania...
  Northern Allegheny County in southwestern Pennsylvania...
  Northwestern Westmoreland County in southwestern Pennsylvania...
  Southwestern Armstrong County in west central Pennsylvania...

* Until 445 PM EDT.

* At 356 PM EDT, a severe thunderstorm was located over Harmony
  Township, or over Aliquippa, moving east at 40 mph.

  HAZARD...Wind gusts to 60 mph and quarter-size hail.

  SOURCE...Radar.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind
           damage to trees and power lines, resulting in some power
           outages.

* Locations impacted include...
  Pittsburgh...                     Penn Hills...
  Ross Township...                  McCandless Township...
  Monroeville...                    Cranberry...
  Moon Township...                  Franklin Park...
  Aliquippa...                      Monaca...
  Vandergrift...                    Apollo...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 17 and 62.
  Interstate 79 in Pennsylvania between mile markers 63 and 86.
  Interstate 376 in Pennsylvania between mile markers 44 and 52, and
  between mile markers 76 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.

&&

LAT...LON 4051 8033 4079 8030 4076 7950 4035 7953
TIME...MOT...LOC 1956Z 273DEG 35KT 4060 8020

HAIL...1.00IN
WIND...60MPH

$$

 

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Mesoscale Discussion 0253
NWS Storm Prediction Center Norman OK
0303 PM CDT Sat Mar 28 2020

Areas affected...Parts of central Indiana and Ohio into southwestern
Pennsylvania

Concerning...Severe Thunderstorm Watch 67...

Valid 282003Z - 282130Z

The severe weather threat for Severe Thunderstorm Watch 67
continues.

SUMMARY...Widely scattered strong to severe thunderstorm activity
may persist near/north of the Interstate 70 corridor another couple
of hours, before diminishing by 6-8 PM EDT.

DISCUSSION...Frontolysis appears underway, from west to east, along
the Interstate 70 corridor, with the primary surface frontal zone
redeveloping northward into southern portions of the Great Lakes
region through early evening.  However, scattered vigorous
thunderstorm development persists, probably aided by inflow of
unstable boundary layer air characterized by CAPE in excess of 1000
J/kg.  

Given the increasingly widespread nature to the convection, and
general stabilization of the surrounding boundary layer due to rain
cooling and decreasing insolation, convective intensities seem
likely to trend downward through 6-8 PM EDT.  However, until then,
widely scattered strong storms, perhaps including a small evolving
cluster approaching northern portions of the Indianapolis metro
area, may continue to pose a risk for severe hail and locally strong
surface gusts.

..Kerr.. 03/28/2020

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Flash Flood Warning

Flash Flood Warning
OHC029-081-PAC003-007-051-125-129-WVC009-029-290215-
/O.NEW.KPBZ.FF.W.0002.200328T2010Z-200329T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
410 PM EDT Sat Mar 28 2020

The National Weather Service in Pittsburgh has issued a

* Flash Flood Warning for...
  Eastern Jefferson County in east central Ohio...
  Southeastern Columbiana County in east central Ohio...
  Washington County in southwestern Pennsylvania...
  Southwestern Beaver County in western Pennsylvania...
  Central Allegheny County in southwestern Pennsylvania...
  Westmoreland County in southwestern Pennsylvania...
  Northern Fayette County in southwestern Pennsylvania...
  Brooke County in northern West Virginia...
  Hancock County in northern West Virginia...

* Until 1015 PM EDT Saturday.

* At 408 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is ongoing or
  expected to begin shortly.

  HAZARD...Flash flooding.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Pittsburgh, Penn Hills, Mount Lebanon, Bethel Park, Ross Township,
  Monroeville, Moon Township, McMurray, Greensburg, Weirton,
  McKeesport and Steubenville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.

&&

LAT...LON 4018 7913 4018 7914 4016 7914 4016 7916
      4012 7917 4011 7919 4012 7921 4008 7927
      3986 7942 4022 8068 4060 8067 4033 7902

FLASH FLOOD...RADAR INDICATED

$$

 

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Looks like the city avoided the brunt of this first wave. That's fine with me I'm at work and would rather not have to chase wires down and sit there waiting for Duquesne Light. 

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4 minutes ago, Rd9108 said:

Looks like the city avoided the brunt of this first wave. That's fine with me I'm at work and would rather not have to chase wires down and sit there waiting for Duquesne Light. 

Normally I'm all about the severe weather, usually being disappointed with the weak sauce we tend to get.

But considering everything going on,  I agree with not having to deal with any extra problems.

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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
504 PM EDT Sat Mar 28 2020

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Southern Washington County in southwestern Pennsylvania...
  Greene County in southwestern Pennsylvania...
  Western Fayette County in southwestern Pennsylvania...
  Southeastern Ohio County in northern West Virginia...
  Northeastern Marshall County in northern West Virginia...

* Until 545 PM EDT.

* At 504 PM EDT, a severe thunderstorm was located near Triadelphia,
  moving east at 40 mph.

  HAZARD...Wind gusts to 60 mph and quarter-size hail.

  SOURCE...Radar.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind
           damage to trees and power lines, resulting in some power
           outages.

* Locations impacted include...
  Waynesburg...                     California...
  Masontown...                      Brownsville...
  Fredericktown-Millsboro...        Fairdale...
  Jefferson Boro...                 Isabella...
  Rogersville...                    West Brownsville...
  West Finley...                    Deemston...

This includes  Interstate 79 in Pennsylvania between mile markers 6
and 26.

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Damn looks like spring is here. That’s one thing that doesn’t change, a constant. Weather. It’s a relief from all that is going on. 
 

some more rumbles of thunder now. Looks like we avoided the worst here in Shaler. Lots of hail in stubenville. (Pic from Twitter)

66A653F6-4F47-45F6-84EB-D086720EC1E6.jpeg

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We got a very brief and minor bout of hail yesterday with that "supercell," but it seemed the actual hail core went south of us, closer to Canonsburg.  Our hail was minuscule in comparison (pea size at the most).

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3 minutes ago, north pgh said:

Tornado warning for beaver County 

Things look to get interesting in the next hour or so. With all of the quarantine / stay at home stuff the kids bedtime has been slipping later and later. I expect that line coming through will wake them.

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A lot of very bright lightning with this line. I even saw a transformer blow in the distance. 

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