As low pressure moved across the Ohio valley strong southeast winds moved down the western slopes of the Laurel Ridges producing isolated wind damage.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PBZ wrote it up.
As low pressure moved across the Ohio valley strong southeast winds moved down the western slopes of the Laurel Ridges producing isolated wind damage.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before the first event at Apr 20, 9:25 AM EST, 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1025 AM EDT MON APR 20 2009 .SYNOPSIS... A LOW PRESSURE SYSTEM MOVING NORTHWARD THROUGH THE OHIO VALLEY TODAY WILL SLOW AS IT PASSES THROUGH THE UPPER GREAT LAKES TUESDAY AND WEDNESDAY. SO EXPECT FREQUENT SHOWERS AND CHILLY DAYTIME TEMPERATURES INTO THURSDAY. HIGH PRESSURE COMING FROM THE SOUTHERN STATES WILL THEN FOLLOW WITH DRY AND WARMER WEATHER FOR NEXT WEEKEND. && .NEAR TERM /THROUGH TONIGHT/... SURFACE LOW PRESSURE OVER THE OHIO VALLEY WILL DRIFT TO THE NORTH TODAY. ALTHOUGH SHOWERS DIMINISHED DURING THE OVERNIGHT HOURS...ADDITIONAL RAIN IS EXPECTED TO MOVE INTO THE AREA FROM THE SOUTH BY DAYBREAK. MOST OF THE REGION SHOULD PICK UP ANOTHER QUARTER TO HALF INCH OF RAIN. A LOW LEVEL JET WILL DEVELOP ACROSS THE NORTHEAST COUNTIES IN THE MORNING...WHICH COULD BRING GUSTS UP TO 40 MPH BEFORE WINDS DECREASE IN THE AFTERNOON. MARGINAL AMOUNTS OF INSTABILITY WILL BE PRESENT FROM PITTSBURGH SOUTH...AND A FEW THUNDERSTORMS CANNOT BE RULED OUT IN THOSE LOCATIONS. MODELS HAVE COME INTO FAIRLY GOOD AGREEMENT THAT A NOTICEABLE DRY SLOT WILL WORK ACROSS THE AREA TONIGHT AFTER THE PASSAGE OF THE COLD FRONT. ALTHOUGH CLOUDS ARE STILL EXPECTED TO REMAIN...REDUCED POPS TO CHANCE ACROSS MUCH OF THE AREA. TEMPERATURES WILL BE SLIGHTLY BELOW NORMAL DURING THE PERIOD. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... THE MAIN WEATHER MAKER FOR TUESDAY AND WEDNESDAY WILL BE THE UPPER LEVEL LOW OVER MICHIGAN THAT BROUGHT THE SURFACE LOW. THE UPPER LOW WILL BE OVER LOWER MICHIGAN BY TUESDAY MORNING...AND SLOWLY MEANDER ALONG THE U.S.-CANADA BORDER REACHING VERMONT BY THURSDAY MORNING. IT IS STILL A BIT HARDER TO RESOLVE INDIVIDUAL SHORTWAVES THAT WILL ROTATE AROUND THE LOW AND BRING SHOWERS TO THE REGION. CURRENT THINKING IS THAT ONE ROUND OF SHOWERS WILL MOVE THROUGH TUESDAY AFTERNOON...WITH ANOTHER ROUND WEDNESDAY MORNING. FOR NOW...WILL KEEP HIGH CHANCE TO LOW LIKELY POPS THROUGH MUCH OF THIS PERIOD. MOST PRECIPITATION SHOULD COME TO AN END BY WEDNESDAY EVENING. HIGH TEMPERATURES WILL BE ABOUT 10 DEGREES BELOW NORMAL WITH LOW TEMPERATURES ABOUT 5 DEGREES BELOW NORMAL. EVEN WITH THE BELOW NORMAL TEMPERATURES...APPEARS THAT LOWS TUESDAY AND WEDNESDAY NIGHT WILL REMAIN WARM ENOUGH THAT ALL PRECIPITATION SHOULD FALL AS RAIN. && .LONG TERM /THURSDAY THROUGH SUNDAY/... RECENT BLEND OF GEFS AND ECMWF MODEL RUNS SHOW HIGH PRESSURE FROM THE SOUTHERN STATES BUILDING NORTHWARD INTO THE TENNESSEE AND OHIO VALLEYS BY THE WEEKEND. SO EXPECT DRY WEATHER BY FRIDAY AND A WARM UP FOR THE WEEKEND AS SUGGESTED BY RECENT GFS MOS VALUES. && .AVIATION /14Z MONDAY THROUGH FRIDAY/... DEEP LOW PRESSURE WILL DIG OVER THE GREAT LAKES REGION TODAY. AN AREA OF SHWRS IS MOVING NORTH ACROSS EASTERN OHIO IN ASSOCIATION WITH A SHORT WAVE ROTATING AROUND THE TROUGH. ELSEWHERE...SCATTERED TO NUMEROUS SHWRS PREVAIL. ONCE THE SHORT WAVE MOVES TO THE NE...THINK ACTIVITY WILL BECOME MORE SCATTERED IN ADVANCE OF THE SURFACE COLD FRONT...WITH AN ISOLATED TSTM PSBL. GUSTY SOUTHEAST WINDS WILL PREVAIL TODAY...ESPECIALLY ON THE LEE SIDE OF THE TERRAIN...AFFECTING MGW/LBE THE GREATEST...WITH A FEW GUSTS TO 30-40 KT PSBL FOR THE NEXT FEW HOURS UNTIL THE GRADIENT SLACKENS SOME THIS AFTN. LOW PRESSURE WILL CONTINUE TO PREVAIL THROUGH TUESDAY...WITH PERIODS OF SHWRS AND MVFR/IFR CONDITIONS. LOW PRESSURE WILL EXIT THE REGION ON WEDNESDAY WITH PRIMARILY VFR WEATHER RETURNING FOR THE REMAINDER OF THE WEEK. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && 15/33
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 424 AM EDT MON APR 20 2009 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-211200- GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON- JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO- FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY- ARMSTRONG-INDIANA-WASHINGTON-WESTMORELAND-GREENE-FAYETTE-HANCOCK- BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER- 424 AM EDT MON APR 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
1 high wind. Local standard time, as filed.
Latrobe fire and rescue reported high winds brought down power lines on James Street and blew a roof off a house on Ligonier Street in Latrobe.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2009Every state in 2009This day in weather historyWarnings in Pennsylvania, April 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 157401.