Area Forecast Discussion
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000 FXUS61 KPBZ 042217 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 617 PM EDT WED MAY 4 2016 .SYNOPSIS... PERSISTENT LOW PRESSURE WILL MAINTAIN SHOWERS IN THE FORECAST THROUGH FRIDAY. RAIN CHANCES RETURN SATURDAY. && .NEAR TERM /THROUGH THURSDAY/...
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MADE SOME CHANGES TO POPS BASED ON RADAR AND NEAR-TERM MODEL TRENDS. STILL EXPECT DEFORMATION ZONE TO TAKE ON MORE OF A NORTHWEST/SOUTHEAST ORIENTATION WITH TIME THIS EVENING AND OVERNIGHT AS THE UPPER LOW DIGS SOUTH. FOCUS WILL BE ON THE SOUTHEAST CWA AFTER 06Z. WILL KEEP AN EYE ON RAINFALL TOTALS IN THIS AREA AS FLASH FLOOD GUIDANCE IS RELATIVELY LOW...PARTICULARLY IN MARION/MONONGALIA COUNTIES. STILL THINK RAINFALL RATES WILL NOT BE SUFFICIENT TO CAUSE SIGNIFICANT PROBLEMS. WILL CONTINUE ISOLATED THUNDER MENTION INTO THIS EVENING AS WELL. CL PREVIOUS DISCUSSION FOR THURSDAY... THURSDAY WILL SEE CONTINUED SCATTERED SHOWERS AS THE UPPER LOW CENTER SLOWLY MOVES EAST ACROSS NORTH CAROLINA. TEMPERATURES ARE FORECAST TO BE 10 DEGREES BELOW NORMAL ON AVERAGE ACROSS THE REGION.
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&& .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/... THE H5 CLOSED LOW MENTIONED ABOVE WILL MEANDER AROUND THE MID- ATLANTIC REGION THROUGH AT LEAST FRI NIGHT...WITH VORTICITY LOBES CIRCUMNAVIGATING THE SYSTEM. THESE WAVES WILL SUPPORT SHOWERS IN THE SERN ZONES AND ESPECIALLY IN THE RIDGES ON THU NIGHT...WHERE MODEST UPSLOPE FLOW WILL ENHANCE PRECIPITATION POTENTIAL. BRIEF SHORTWAVE RIDGING ON SATURDAY WILL HELP DIVERT THE UPPER LOW AND BRING AN END TO THE PRECIPITATION FOR SAT AFTERNOON. A STRONG SHORTWAVE TROUGH DIGGING INTO THE WRN GREAT LAKES REGION WILL SHUNT THE UPPER RIDGE SEWD...WITH PRECIPITATION CHANCES CONSEQUENTLY INCREASING SAT NIGHT AS THE ASSOCIATED COLD FRONT APPROACHES AND CROSSES THE REGION. && .LONG TERM /SUNDAY THROUGH WEDNESDAY/... PRECIPITATION SAT NIGHT WILL EXIT QUICKLY BY SUN MORNING IN THE WAKE OF THE GREAT LAKES SHORTWAVE TROUGH. ALTHOUGH LITTLE PRECIPITATION IS EXPECTED ON SUN...THE REGION WILL REMAIN ON THE NRN SIDE OF A STALLED FRONTAL BOUNDARY. THUS...MAXIMA WILL REMAIN SLIGHTLY-BELOW NORMAL IN THE LOW-MID 60S. A STRONG LOW PRESSURE SYSTEM THAT HAD BEEN LOCATED IN THE SWRN CONUS THROUGH THE WEEKEND WILL EJECT SLOWLY INTO THE MISSISSIPPI RIVER VALLEY BY EARLY NEXT WEEK...LEADING TO AN AMPLIFYING RIDGE OVER THE ERN CONUS AND ATTENDANT INCREASE IN WARM AIR BEGINNING ON MON. NEAR-CLIMATOLOGICAL POPS WERE INCLUDED IN THE FORECAST DURING THIS TIME AS THE FCST AREA WILL RESIDE IN THE MOIST WARM SECTOR. ALTHOUGH THERE IS TIMING DISAGREEMENT AMONG THE MEDIUM-RANGE MODELS...A COLD FRONT IS EXPECTED TO APPROACH THE REGION LATE WED/THU AS THE AFOREMENTIONED UPPER-LEVEL LOW APPROACHES THE REGION. GIVEN THE TIMING DIFFERENCES...THIS COMBINATION OF FEATURES WARRANTS GENERAL HEIGHTENED POPS AND INCREASED CLOUD COVER DURING ITS TENURE IN THE REGION. && .AVIATION /22Z WEDNESDAY THROUGH MONDAY/... VFR THE REMAINDER OF THE DAY UNTIL CONDITIONS DETERIORATE THROUGH THE EVENING AS AN AREA OF LOW PRESSURE MOVES OVER THE REGION. MVFR AND OCCASIONAL IFR WILL THEN BE LIKELY THROUGH THURSDAY NIGHT. .OUTLOOK /THURSDAY THROUGH SUNDAY/... PERIODIC RESTRICTIONS ARE LIKELY THU/FRI WITH PERSISTENT LOW PRESSURE...AND AGAIN WITH A COLD FRONT ON SAT NIGHT. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && $$

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