Western Pennsylvania Weather: 10/27/18

Yesterday was a rainy, nasty mess along our drive from Jersey, VA, to Pittsburgh, PA.

This morning has been overcast, rainy and cool.

The NWS in Pittsburgh, PA, forecasts (for Pittsburgh, PA) a cloudy day, with a 70% chance of showers, and a high temperature near 47 F.  Winds will be from the northeast at 7 mph.  Tonight will be cloudy, with a 70% chance of showers, and a low temperature of 42 F.  Winds will be from the west at 5 mph.

The visible satellite imagery shows heavy cloud cover over the entire region.

The 12Z upper air sounding from Pittsburgh shows a saturated atmosphere below 450 mb.  There was 0.85 inches of precipitable water present in the column.  There was no Convective Available Potential Energy (CAPE) and no Convective Inhibition (CINH).  The Lifted Condensation Level (LCL) was 0 m.  There was a large thermal inversion near the surface, and the 0-3 km average lapse rate was 3.1 C/km.

The hodograph shows that there was 28 kts low-level shear (due mostly to directional changes) and 20 kts deep-layer shear (due mostly to speed changes).

The surface observations (from the SPC Mesoscale Analysis Map) show cool temperatures and high humidity (based on the surface dewpoint depressions).  The skies are mostly cloudy (according to the sensors), and the winds are light and from the northwest.  Doppler RADAR shows falling rain over much of the region.

The surface pressure chart shows the strong low that makes up the “nor’easter”.  This nor’easter will move north along the coast over the next six hours.

The NAM 250 mb chart shows moderate southwesterly flow aloft.

The NAM 850 mb chart shows no significant thermal advection.  This chart has been excluded from today’s post.

The HRRR simulated reflectivity shows showers all day in the Pittsburgh, PA.

The HRRR predicts that the high temperatures for the the Pittsburgh Metro area will peak around 22 Z, reaching into the mid 40s F.

The HRRR shows that the the dewpoints will remain in the 40s F today.

The HRRR shows strong wind gusts are not very likely today.  This chart has been excluded from today’s post.

The HRRR shows that skies will remain cloudy all day.

Today will be another cloudy, rainy day.  It’s a good day to be indoors for a conference, but a bad day to be outside.

Thank you for reading my post.

Sources:
The forecasts from the National Weather Service are from The NWS Homepage
The upper air soundings and mesoscale analysis plots are from the Storm Prediction Center website.
The satellite data, model data, and forecasted soundings are from College of DuPage – SATRAD

About highplainschasing

This blog is about my tales in storm chasing. My name is Seth Price and I am an instrumentation instructor at New Mexico Tech. My amateur radio call sign is N3MRA.
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