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Pittsburgh PA ❄️ Winter 2017-2018


north pgh

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33 minutes ago, TeaysValleyWV said:

Out with dog and it is nasty, 32 and freezing rain, deck railing starting to ice up.  Sidewalks and street still wet.  I don't think I have ever witnessed a change over to freezing rain while it was raining as hard as this.

Yeah usually the latent heat release can over power any antecedent cold, but in this case cold is in full force and getting replaced. 

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mcd0025.gif

 

Mesoscale Discussion 0025
   NWS Storm Prediction Center Norman OK
   0604 PM CST Fri Jan 12 2018

   Areas affected...Portions of southeastern OH...WV...western
   MD...PA...NY...VT...and northern NH

   Concerning...Winter mixed precipitation 

   Valid 130004Z - 130600Z

   SUMMARY...An initial transition from rain to freezing rain, then to
   sleet and snow will occur this evening as a cold front moves
   eastward.

   DISCUSSION...23Z surface analysis shows a cold front extending from
   northern VT into central NY/PA, and then continuing into western MD
   and WV. The cold front will develop generally east-southeastward
   through 06Z, with the 32F surface isotherm lagging the initial wind
   shift by about 90-100 miles. A mid/upper-level trough/low centered
   over KY/TN will continue moving east-northeastward this evening.
   Large-scale lift associated with the upper trough/low has promoted a
   broad area of mostly light to moderate precipitation from WV
   northward to NY.

   Recent surface observations and local storm reports indicate a
   relatively narrow corridor of freezing rain is occurring
   along/behind the surface freezing-line intersection with the ongoing
   light/moderate rain. Freezing rain rates of at least several
   hundredths of an inch per hour will be likely, with rates up to 0.10
   inch per hour possible in the heaviest showers. These higher rates
   appear more likely across northern PA into south-central NY over the
   next few hours as an area of moderate to locally heavy rain moves
   across this region and surface temperatures fall below freezing.

   A transition to sleet and then snow will occur as a residual
   low-level warm nose centered around 900-750 mb quickly erodes with
   the approach of the mid/upper level trough/low. Some of the snow may
   become heavy at times, with rates around 1 inch per hour, especially
   across western PA/NY into southeastern where this transition to snow
   is already occurring.

   ..Gleason.. 01/13/2018
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9 minutes ago, MikeB_01 said:

I feel like I have been waiting forever for this temp to drop. Still above freezing in the south hills

I hear ya.

If we can get that last push of cold air before all the good precip in W.V. gets here, we'll likely be ok.

It's gonna be close though, I'll definitely be stepping away from the screen at times. Lol

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21 minutes ago, blackngoldrules said:

Has anybody heard any thunder from this? I could have sworn I just heard a clap of thunder a few minutes ago.

Sent from my SM-G920P using Tapatalk
 

Nothing showing up on radar scope or on the lightning map. Closest strikes are in South Carolina. 

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Actual sounding (valid 00z) vs 18z Nam (valid 00z) vs HRRR (valid 00z)

NAM was a better snow for us, but the HRRR profile looks closer to the actual sounding. 

However, it looks like the Nam has some warmer air aloft than the HRRR. 

More evidence to support an interesting night indeed.

Screen Shot 2018-01-12 at 8.35.56 PM.png

Screen Shot 2018-01-12 at 8.37.13 PM.png

Screen Shot 2018-01-12 at 8.48.45 PM.png

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