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Western PA/Pittsburgh Summer Discussion 2021


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The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Northeastern Jefferson County in east central Ohio...
  Beaver County in western Pennsylvania...
  Northwestern Washington County in southwestern Pennsylvania...
  Southern Lawrence County in western Pennsylvania...
  Southwestern Butler County in west central Pennsylvania...
  Northwestern Allegheny County in southwestern Pennsylvania...
  Hancock County in northern West Virginia...

* Until 115 PM EDT.

* At 1225 PM EDT, a severe thunderstorm was located over Aliquippa,
  moving southeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Emergency management.

  IMPACT...Expect damage to trees and power lines, resulting in some
           power outages.

* Locations impacted include...
  Pittsburgh, Mount Lebanon, Ross Township, McCandless Township,
  Cranberry, Moon Township, Weirton, Franklin Park, Aliquippa, Beaver
  Falls, Monaca, and Shaler Township.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This is a DANGEROUS SITUATION. This storm is producing widespread
wind damage across Beaver County. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

 

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4 minutes ago, Ahoff said:

Tomorrow high is forecast at 93, record is 94.  Let's see if we make a run.  If we make it to 94 it would be the first record high in August since 1995!

August 1995...:axe:

Tomorrow is the easiest record high in August to break or tie, the earliest of 4 days in August with a record high of 94. I guess if we have a shot, I’m in.

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37 minutes ago, TimB84 said:

August 1995...:axe:

Tomorrow is the easiest record high in August to break or tie, the earliest of 4 days in August with a record high of 94. I guess if we have a shot, I’m in.

I was born January '95, so I don't remember, but was told how hot it was.  Also, that was the last year we hit 100.

Anyway, NWS bumped tomorrow's temperature to 94.

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1 hour ago, Ahoff said:

Tomorrow high is forecast at 93, record is 94.  Let's see if we make a run.

And lots of ground moisture for the sun to crank up the dew point too if it so much as even peaks around a cloud.  Totally awesome weather to work in while I clear a huge oak that fell in the backyard starting tonight, unfortunately.  :violin:

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44 minutes ago, donyewest said:

And lots of ground moisture for the sun to crank up the dew point too if it so much as even peaks around a cloud.  Totally awesome weather to work in while I clear a huge oak that fell in the backyard starting tonight, unfortunately.  :violin:

What would limit the temperature rising that high is the high humidity levels.

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1 minute ago, Ahoff said:

Wonder if we get at least a heat advisory tomorrow.  There is a glaring hole on the hazard map, but typically NWS Pittsburgh, lol.

Would think so. Isn’t the criteria a heat index of 100? My point & click has me at 93/73/102 at the peak and 4 hours of a heat index at or above 100. If that’s not a heat advisory, what is?

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4 minutes ago, Ahoff said:

Yeah, but still that is serious for the elderly and those with breathing difficulty.

No disagreement from me on that one. NWS forecast discussion mentions it as “borderline” for headline issuance, with “upper 90s” heat indices. But their point and click (at my location) shows a heat index of 102 and the zone forecast for Allegheny County says “heat index up to 104”. I’m not saying they shouldn’t issue one, just trying to come up with a reason they haven’t.

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43 minutes ago, TimB84 said:

No disagreement from me on that one. NWS forecast discussion mentions it as “borderline” for headline issuance, with “upper 90s” heat indices. But their point and click (at my location) shows a heat index of 102 and the zone forecast for Allegheny County says “heat index up to 104”. I’m not saying they shouldn’t issue one, just trying to come up with a reason they haven’t.

No it makes sense why.  I’m still skeptical we get above 92.

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4 minutes ago, Ahoff said:

No it makes sense why.  I’m still skeptical we get above 92.

Storms have washed out the last two afternoons more than they were expected to, and although tomorrow looks less conducive for storms than either yesterday or today, the NWS is hedging their bets.

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37 minutes ago, Ahoff said:

Getting very cloudy.  Probably going to be tough to even hit 90 if the clouds don't break quickly.

Should be some clearing this afternoon, but I agree, our chances of tying or breaking a record seem very slim. Need 10+ degrees from 11:30. Max at PIT so far is 83. It probably isn’t impossible to pick up 7 degrees this afternoon, but I would think 11 is a bridge too far, even if we had full clearing.

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35 minutes ago, TimB84 said:

Should be some clearing this afternoon, but I agree, our chances of tying or breaking a record seem very slim. Need 10+ degrees from 11:30. Max at PIT so far is 83. It probably isn’t impossible to pick up 7 degrees this afternoon, but I would think 11 is a bridge too far, even if we had full clearing.

We'll struggle to 90 today.  Maybe the NWS shouldn't have triggered the Heat Advisory.  They jinxed it, lol!

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Thunderstorm Warning

Severe Weather Statement
National Weather Service Pittsburgh PA
1241 PM EDT Thu Aug 12 2021

PAC003-007-019-129-121715-
/O.CON.KPBZ.SV.W.0241.000000T0000Z-210812T1715Z/
Beaver PA-Butler PA-Allegheny PA-Westmoreland PA-
1241 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR SOUTHEASTERN BEAVER...SOUTHWESTERN BUTLER...NORTHERN ALLEGHENY
AND NORTHWESTERN WESTMORELAND COUNTIES...

At 1241 PM EDT, a severe thunderstorm was located over Emsworth, or
near Franklin Park, moving southeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines, resulting in some
         power outages.

Locations impacted include...
Pittsburgh, Penn Hills, Mount Lebanon, Ross Township, McCandless
Township, Cranberry, Moon Township, Franklin Park, Aliquippa, Monaca,
Shaler Township, and Plum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection 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 4058 7970 4042 7990 4038 8003 4062 8035
      4077 8020
TIME...MOT...LOC 1641Z 296DEG 33KT 4053 8012

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

 

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Yopq7f6.gif
 

SEL3

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 433
   NWS Storm Prediction Center Norman OK
   345 PM EDT Thu Aug 12 2021

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northeastern Ohio
     Western Pennsylvania
     The northern West Virginia Panhandle
     Lake Erie

   * Effective this Thursday afternoon and evening from 345 PM until
     1000 PM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph likely
     Isolated large hail events to 1 inch in diameter possible

   SUMMARY...Thunderstorms are beginning to form in northeastern Ohio, 
   and storm coverage/intensity is expected to increase through the
   remainder of the afternoon as storms move into western Pennsylvania.
    The storm environment favors clusters of storms with damaging winds
   of 60-70 mph, and the strongest storms may also produce isolated
   large hail near 1 inch diameter.

   The severe thunderstorm watch area is approximately along and 55
   statute miles north and south of a line from 20 miles south
   southwest of Cleveland OH to 35 miles north northeast of Latrobe PA.
   For a complete depiction of the watch see the associated watch
   outline update (WOUS64 KWNS WOU3).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Severe Thunderstorm Watch means conditions are
   favorable for severe thunderstorms in and close to the watch area.
   Persons in these areas should be on the lookout for threatening
   weather conditions and listen for later statements and possible
   warnings. Severe thunderstorms can and occasionally do produce
   tornadoes.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 431...WW 432...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few
   cumulonimbi with maximum tops to 550. Mean storm motion vector
   28035.

   ...Thompson

 

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