Area Forecast Discussion
Issued by NWS

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KPBZ 252025 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 325 PM EST SUN JAN 25 2015 .SYNOPSIS... LOW PRESSURE WILL BRING WIDESPREAD SNOW LATER TODAY THROUGH MONDAY. && .NEAR TERM /THROUGH MONDAY/... LATEST WV IMAGERY SHOWS MID LEVEL LOW CENTER JUST OVER WESTERN KY NOW SHIFTING EAST AS THE ASSOCIATED JET MAX SITS RIGHT OVER OR EAST OF THE TROUGH AXIS. THE HRRR HAS BEEN HANDLING THINGS WELL SO FAR TODAY AND OPTED TO MAKE MINOR CHANGES TO AMOUNTS AND LOCATIONS OF MORE INTENSE SNOW THIS EVENING BASED ON LATEST RUNS. OVERALL...VERY LITTLE CHANGE WAS NEEDED TO THE PREVIOUS FORECAST AS LATEST RUNS HELD GOOD CONTINUITY. TEMPERATURES IN THE LOWER LEVELS ARE SLIGHTLY WARMER SOUTH OF INTERSTATE 70 AND CONSEQUENTLY THE CHANGEOVER TO SNOW MAY NOT BE UNTIL WELL AFTER MIDNIGHT...SO AMOUNTS MAY NOT BE QUITE AS HIGH ACROSS THE SOUTHERN FRINGE OF THE FORECAST AREA. TO THE NORTH WHERE PRECIPITATION WILL BE ALL SNOW...ACCUMULATIONS ARE STILL EXPECTED TO RANGE FROM 4-6 INCHES THROUGH MONDAY WITH THE GREATEST AMOUNTS FROM PITTSBURGH NORTH TO INTERSTATE 80 WHERE MODELS SHOW THE BEST DYNAMICS. THE MOST INTENSE SNOWFALL RATES AREA EXPECTED TO OCCUR FROM EARLY THIS EVENING UNTIL SHORTLY AFTER MIDNIGHT. THE WINTER WEATHER ADVISORY WHICH COVERS THE ENTIRE FORECAST AREA WAS LEFT UNCHANGED. SNOW WILL CONTINUE THROUGH MUCH OF MONDAY AS MOISTURE WRAPS AROUND THE LOW AND ASSOCIATED INVERTED TROUGH SHIFTS NORTHEAST OVER THE REGION.; && .SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/... UNSETTLED CONDITIONS WILL CONTINUE UNTIL HIGH PRESSURE BUILDS IN BY WEDNESDAY MORNING. UNTIL THEN...SCATTERED SNOW SHOWERS WILL PERSIST UNDER NORTHWESTERLY FLOW ALOFT AND A SUFFICIENTLY DEEP BOUNDARY LAYER. TEMPERATURES WILL FALL TO APPROXIMATELY 10 DEGREES BELOW CLIMO NORMALS. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... WEDNESDAY AND WEDNESDAY NIGHT MAY BE THE ONLY DRY 24 HOUR PERIOD FOR THE ENTIRE FORECAST AREA THROUGH THE SEVEN DAY FORECAST. HIGH PRESSURE WILL MOVE ACROSS THE REGION ON WEDNESDAY...AND SHOULD ALLOW FOR ONE PARTLY/MOSTLY SUNNY DAY. FAST MOVING CLIPPER SYSTEM WILL BRING ANOTHER ROUND OF SNOW THURSDAY INTO THURSDAY NIGHT WITH A WINTRY MIX POSSIBLE ALONG AND SOUTH OF I-70. BUMPED UP POPS TO LIKELY FOR THIS SYSTEM. UPPER LEVEL TROUGH WILL REMAIN IN PLACE INTO NEXT WEEKEND WITH WELL BELOW NORMAL TEMPERATURES. SOME IMPORTANT TIMING DIFFERENCES FOR NEXT WEEKEND WITH NEXT CLIPPER AND DELIVERY OF EVEN COLDER ARCTIC AIR INTO THE UPPER OHO VALLEY. WPC PROGS LOOKS TO BE A GOOD COMPROMISE WITH A CHANCE OF SNOW SHOWERS LATER SATURDAY THROUGH SUNDAY. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... THERE ARE A MIX OF MVFR/IFR CIGS IN ADVANCE OF THE LOW PRESSURE SYSTEM THAT WILL MOVE INTO THE REGION THIS AFTERNOON/EVENING. AS WIDESPREAD SNOW ARRIVES...ALL SITES WILL BECOME IFR AND EVENTUALLY LIFR. FKL/DUJ ARE THE ONLY SITES THAT MAY NOT DROP TO LIFR IF HEAVIER SNOW REMAINS TO THE SOUTH. ALSO EXPECT ZZV/MGW TO HAVE A MIX OF RAIN/SNOW BEFORE CHANGING TO ALL SNOW. INTERMITTENT VLIFR IN HEAVIER SNOW BANDS IS ALSO POSSIBLE...BUT DO NOT HAVE CONFIDENCE FOR TIMING/LOCATION TO INCLUDE IN 18Z TAFS. SNOW WILL CONTINUE...BUT IS EXPECTED TO EASE UP IN INTENSITY...BY MONDAY MORNING. .OUTLOOK.../MONDAY THROUGH FRIDAY/... RESTRICTIONS IN SNOW WILL CONTINUE MONDAY AFTERNOON INTO TUESDAY. NEXT WIDESPREAD RESTRICTIONS THURSDAY AFTERNOON INTO FRIDAY WITH A CLIPPER SYSTEM. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...WINTER WEATHER ADVISORY UNTIL 1 PM EST MONDAY FOR MDZ001. OH...WINTER WEATHER ADVISORY UNTIL 1 PM EST MONDAY FOR OHZ039>041- 048>050-057>059-068-069. PA...WINTER WEATHER ADVISORY UNTIL 1 PM EST MONDAY FOR PAZ007>009- 013>016-020>023-029-031-073>076. WV...WINTER WEATHER ADVISORY UNTIL 1 PM EST MONDAY FOR WVZ001>004- 012-021>023-041. && $$

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.