497  
FXUS61 KPBZ 191746  
AFDPBZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
1246 PM EST WED FEB 19 2020  
   
SYNOPSIS
 
 
OUTSIDE OF ISOLATED FLURRIES ON THURSDAY, HIGH PRESSURE WILL  
MAINTAIN DRY CONDITIONS, WITH MODERATING TEMPERATURE THROUGH THE  
WEEKEND.  
 

 
   
NEAR TERM /THROUGH TONIGHT/
 
 
NWLY FLOW ON THE EASTERN FLANK OF SFC HIGH PRESSURE, COMBINED WITH  
UPPER FLOW STREAMING THROUGH THE BASE OF LOW PRESSURE NORTH OF  
QUEBEC, WILL SUPPORT BOTH DRY AND COOL CONDITIONS THROUGH THE PERIOD.  
 

 
   
SHORT TERM /THURSDAY THROUGH SATURDAY NIGHT/
 
 
BROAD SFC HIGH PRESSURE IS EXPECTED TO MAINTAIN GENERALLY DRY WEATHER  
THROUGH SATURDAY, BUT A FORECAST CAVEAT IS THE NORTHERN STREAM LONGWAVE  
TROUGH DIGGING ACROSS THE PLAINS AND GREAT LAKES ON THURSDAY WITH AN  
ASSOCIATED MID LEVEL MOISTURE TAP. WITH STEEPENING LAPSE RATES IN  
COLD ADVECTION, EXPECT AT LEAST AN INCREASE IN CLOUDS, AND POSSIBLY  
SOME LIGHT SNOW OR FLURRIES WITH THE PASSAGE OF THE TROUGH. HOWEVER;  
DESPITE BOUNDARY LAYER INSTABILITY, LACK OF SUFFICIENT MOISTURE  
DEPTH SHOULD INHIBIT SNOW ACCUMULATION.  
 
OTHERWISE, SEASONABLY COLD TEMPERATURE READINGS SHOULD MODERATE  
TOWARD THE AVERAGES BY SATURDAY AFTERNOON AS UPPER RIDGING ENSUES.  
 

 
   
LONG TERM /SUNDAY THROUGH WEDNESDAY/
 
 
BROAD UPPER RIDGING ACROSS THE CENTRAL CONUS IS PROGGED TO MAINTAIN  
DRY WEATHER FOR THE UPPER OH WITH MODERATING TEMPERATURE THROUGH THE  
WEEKEND. PRECIPITATION CHANCE IS FORECAST TO INCREASE AGAIN BY MONDAY  
AS SOUTHERN STREAM LOW PRESSURE EMERGES FROM THE PLAINS AND DIGS UP  
THE OHIO VALLEY AS IT WEAKENS. WITH COLDER AIR LOCKED NORTHWARD VIA  
THE NORTHERN STREAM OF THE JET, AND WITH WARM ADVECTION ON THE VAN OF  
THE LOW, PRECIPITATION WITH THAT EVENT SHOULD PRIMARILY BE RAIN.  
 

 
   
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
 
 
VFR EXPECTED THROUGH THE TAF PERIOD WITH HIGH PRESSURE IN CONTROL.  
   
OUTLOOK
 
 
MVFR POSSIBLE NORTH OF KPIT LATER ON THU UNDER WITH A CROSSING  
SHORTWAVE.  
 

 
   
PBZ WATCHES/WARNINGS/ADVISORIES
 
 
MD...NONE.  
OH...NONE.  
PA...NONE.  
WV...NONE.  
 

 
 

 
 
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