A warm frontal boundary moved north of Eastern Maryland on the night on the 2nd with an associated area of low pressure. Several clusters of thunderstorms developed along the front leading to strong winds, hail and heavy rainfall.
Every event with a place to put it. Tap one for its entry below.
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 PHI wrote it up.
A warm frontal boundary moved north of Eastern Maryland on the night on the 2nd with an associated area of low pressure. Several clusters of thunderstorms developed along the front leading to strong winds, hail and heavy rainfall.
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 Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at May 2, 6:30 PM EST, 1 hour 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 730 PM EDT MON MAY 2 2016 .SYNOPSIS... A BROAD AREA OF LOW PRESSURE IS FORECAST TO SETTLE OVER VIRGINIA AND THE CHESAPEAKE BAY REGION TONIGHT BEFORE DRIFTING OUT TO SEA ON TUESDAY AND TUESDAY NIGHT. AN AREA OF LOW PRESSURE IS EXPECTED TO MOVE SOUTHEASTWARD FROM THE GREAT LAKES ON WEDNESDAY COMBINING WITH ANOTHER LOW OFF THE MIDDLE ATLANTIC COAST ON WEDNESDAY NIGHT. THE COMPLEX LOW IS ANTICIPATED TO MEANDER OFF OUR COAST ON THURSDAY AND FRIDAY BEFORE LIFTING NORTHWARD AND WEAKENING ON SATURDAY. A COLD FRONT FROM THE NORTHWEST IS EXPECTED TO ARRIVE ON SUNDAY FOLLOWED BY HIGH PRESSURE FOR MONDAY. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... MADE SEVERAL UPDATES LATE THIS AFTN AND EARLY THIS EVE TO CAPTURE THE LATEST TRENDS IN OBSERVATIONS/MESOANALYSIS. THE WARM FRONT WAS STRUGGLING TO ADVANCE NORTHWARD THRU MUCH OF THE DAY BUT AS THE STRATUS ERODED LATE IN THE DAY, IT HAS MADE IT INTO THE PHILA METRO AND SRN NJ. CONVECTION HAS BEEN INCREASING IN COVERAGE AND INTENSITY EARLY THIS EVENING TO OUR WEST OVER THE DC AREA. EXPECT THESE SHOWERS AND STORMS TO EXPAND DOWNSTREAM INTO THE DELMARVA REGION OVER THE NEXT COUPLE OF HOURS AS ORGANIZED LIFT STARTS TO OVERSPREAD THE AREA IN ADVANCE OF A SHORTWAVE TROUGH/REMNANT MCV. ADDITIONAL FORCING FOR ASCENT IS FORECAST TO WILL ARRIVE LATER TONIGHT AS WE BECOME SITUATED IN THE RIGHT-ENTRANCE REGION OF AN UPPER- LEVEL JET STREAK TO OUR NORTHWEST. THE RELATIVELY LATE ARRIVAL OF THE WARM FRONT AND CONVECTION AFTER PEAK HEATING HOURS WILL LIMIT OUR OVERALL SEVERE WEATHER THREAT ACROSS THE CWA. NONETHELESS, THERE IS STILL A POTENTIAL FOR DAMAGING WINDS AND LARGE HAIL THIS EVENING ACROSS THE DELMARVA AND FAR SRN NJ (PARTICULARLY ACROSS THE SRN HALF OF DE AND ADJACENT ERN MD). BASED ON THE POSITION OF THE WARM FRONT BOUNDARY AND LATEST HI-RES GUIDANCE, ADDED HEAVY RAINFALL WORDING IN THE WX GRIDS AND ADDED THE RISK FOR LOCALIZED POOR DRAINAGE AND URBAN FLASH FLOODING IN THE HWO FOR SE PA, S NJ, E MD AND DE FOR TONIGHT. THERE IS SOME INDICATION FROM HI-RES MODELS FOR LOCALIZED 2-3 INCH RAINFALL TOTALS IF CELLS TRAIN NEAR THE FRONT. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/... ON TUESDAY THERE MAY BE SOME LINGERING LIGHT PRECIP IN THE MORNING BUT THE AFTERNOON SHOULD BE MOSTLY DRY AS THE UPPER LEVEL DYNAMICS AND UVV MOVE AWAY INTO NEW ENG. A FRONTAL BOUNDARY IS FCST TO REMAIN OVER OR NEAR THE DELMARVA REGION WITH NELY WINDS TO ITS NORTH OVER THE FCST AREA. THIS WILL RESULT IN CONSIDERABLE CLOUDINESS AND SOMEWHAT BELOW NORMAL TEMPS FOR THIS TIME OF YEAR. A FEW BREAKS OF SUN ARE POSSIBLE IN THE AFTERNOON AS THE AIR MASS ALOFT WILL BE DRYING OUT SOME FROM THE PREVIOUS NIGHT. && .LONG TERM /TUESDAY NIGHT THROUGH MONDAY/... A MID LEVEL LOW IS FORECAST TO BE LOCATED OVER THE NORTHERN PART OF THE GREAT LAKES REGION ON TUESDAY NIGHT. AS THE FEATURE SINKS SOUTHWARD ON WEDNESDAY, A SHORT WAVE TROUGH IS EXPECTED TO ROTATE NORTHEASTWARD IN THE CYCLONIC FLOW AND PASS OVER OUR REGION ON WEDNESDAY EVENING. THE MID LEVEL LOW IS ANTICIPATED TO EVENTUALLY REACH NORTH CAROLINA LATE ON THURSDAY BEFORE LIFTING NORTHEASTWARD AND MEANDERING OFF OUR COAST ON FRIDAY AND FRIDAY NIGHT. THE FEATURE IS EXPECTED TO BECOME AN OPEN WAVE ON SATURDAY OR SATURDAY NIGHT BEFORE MOVING TO THE NORTH AND EAST AND AWAY FROM OUR REGION. THE FORECAST WEATHER PATTERN SHOULD BRING CLOUDS AND THE POTENTIAL FOR RAIN SHOWERS TO NORTHEASTERN MARYLAND, DELAWARE, EASTERN PENNSYLVANIA AND NEW JERSEY FOR MUCH OF THE PERIOD FROM TUESDAY NIGHT THROUGH FRIDAY. DAYTIME TEMPERATURES WILL LIKELY BE A BIT BELOW NORMAL FOR EARLY MAY DUE TO THE CLOUD COVER AND SHOWERS. AS THE MID LEVEL SYSTEM AND ITS SURFACE REFLECTION BEGIN TO MOVE AWAY FROM OUR REGION, PARTIAL CLEARING IS POSSIBLE FROM FRIDAY NIGHT INTO SATURDAY. A ROBUST SHORT WAVE TROUGH ROTATING AROUND ANOTHER MID LEVEL LOW OVER NORTHERN QUEBEC SHOULD REACH OUR FORECAST AREA ON SUNDAY AFTERNOON OR SUNDAY EVENING. IT IS FORECAST TO BE PRECEDED BY A SURFACE COLD FRONT ON SUNDAY. WE WILL CARRY A CHANCE OF SHOWERS FOR THAT TIME PERIOD. A MID LEVEL RIDGE APPROACHING FROM THE WEST SHOULD BUILD TOWARD OUR REGION ON MONDAY. IT LOOKS TO BE A MOSTLY SUNNY DAY WITH HIGHS GENERALLY IN THE LOWER 70S. && .AVIATION /23Z MONDAY THROUGH SATURDAY/... THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY AND SURROUNDING AREAS. LOW CLOUDS ARE IN THE PROCESS OF BREAKING UP FROM SOUTH TO NORTH THIS AFTERNOON ALTHO MOST OF OUR TAF SITE STILL HAVE IFR CIGS AS OF MID AFTERNOON. SOME IMPROVEMENT IS EXPECTED THROUGH LATE AFTERNOON AND EARLY EVE WITH MVFR CIGS EXPECTED AT MOST SITES. MORE SHOWERS AND POSSIBLE T-STORMS WILL BE MOVING IN FROM THE SW LATER THIS EVENING WHICH WILL BRING LOWERING CIGS AND POOR VSBY AT TIMES IN HEAVIER PRECIP. GENERALLY IFR CONDS ARE EXPECTED MOST OF THE NIGHT. EVEN THOUGH THE RAIN WILL END...ONLY VERY GRADUAL IMPROVEMENT IS EXPECTED TUE MORNING WITH NORTHEAST WINDS NORTH OF A FRONTAL BOUNDARY. MVFR CIGS AND VSBYS ARE EXPECTED BY THE AFTERNOON. OUTLOOK... TUESDAY NIGHT THROUGH FRIDAY...VARYING BETWEEN VFR AND MVFR WITH THE POTENTIAL FOR RAIN SHOWERS DURING THE PERIOD. CONDITIONS MAY DROP TO IFR AT TIMES IN THE RAIN SHOWERS. FRIDAY NIGHT AND SATURDAY...MAINLY VFR. && .MARINE... WINDS AND SEAS ARE RELATIVELY LIGHT AND ARE EXPECTED TO STAY SO THROUGH TONIGHT AND TUESDAY. LIGHT SELY WIND THIS EVENING WILL EVENTUALLY SHIFT TO NE OVER NIGHT AND TUE AS LOW PRES MOVES OFF THE DELMARVA SHORE AND WEAK HIGH PRESSURE BUILDS IN FROM THE NORTH. SEAS WILL BE NO MORE THAN 2 TO 4 FT. OUTLOOK... TUESDAY NIGHT...NO MARINE HEADLINES ARE ANTICIPATED. WEDNESDAY THROUGH THURSDAY...WAVE HEIGHTS ON OUR OCEAN WATERS MAY BUILD AROUND 5 FEET IN THE NORTHEASTERLY FLOW. THURSDAY NIGHT THROUGH SATURDAY...NO MARINE HEADLINES ARE ANTICIPATED. && .TIDES/COASTAL FLOODING... A LONG NORTHEASTERLY FETCH IS EXPECTED TO DEVELOP OFF OUR COAST DURING THE MID WEEK PERIOD. ASTRONOMICAL TIDES WILL BE ON THE INCREASE AS WE APPROACH THE NEW MOON ON FRIDAY. AS A RESULT, THERE COULD BE SOME MINOR TIDAL FLOODING AROUND THE TIMES OF HIGH TIDE ON WEDNESDAY EVENING AND AGAIN ON THURSDAY EVENING. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...NONE. NJ...NONE. DE...NONE. MD...NONE. MARINE...NONE. && SYNOPSIS...IOVINO NEAR TERM...KLEIN SHORT TERM...AMC LONG TERM...IOVINO AVIATION...AMC/IOVINO MARINE...AMC/IOVINO TIDES/COASTAL FLOODING...IOVINO
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 711 PM EDT MON MAY 2 2016 NJZ001-007>010-012-015-PAZ054-055-060>062-103-105-106-032315- SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CARBON- MONROE-BERKS-LEHIGH-NORTHAMPTON-WESTERN MONTGOMERY-UPPER BUCKS- LOWER BUCKS- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ013-014-020>027-032315- WESTERN MONMOUTH-EASTERN MONMOUTH-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY- ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN- SOUTHEASTERN BURLINGTON- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY AND SOUTHERN NEW JERSEY. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE AREA LATER THIS EVENING AND CONTINUE INTO TONIGHT. THESE STORMS HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL THAT COULD LEAD TO FLOODING IN AREAS OF POOR DRAINAGE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. MINOR TIDAL FLOODING IS POSSIBLE AROUND THE TIMES OF HIGH TIDE ON WEDNESDAY EVENING AND THURSDAY EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ002>004-032315- KENT-INLAND SUSSEX-DELAWARE BEACHES- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE AND SOUTHERN DELAWARE. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE AREA THIS EVENING AND CONTINUE INTO TONIGHT. A FEW OF THESE STORMS THIS EVENING THAT WILL CONTAIN STRONG WIND GUSTS, HAIL AND FREQUENT LIGHTNING. THESE STORMS ALSO HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL THAT COULD LEAD TO FLOODING IN AREAS OF POOR DRAINAGE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. MINOR TIDAL FLOODING IS POSSIBLE AROUND THE TIMES OF HIGH TIDE ON WEDNESDAY EVENING AND THURSDAY EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MDZ012-015-019-020-032315- KENT MD-QUEEN ANNES-TALBOT-CAROLINE- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE AREA THIS EVENING AND CONTINUE INTO TONIGHT. A FEW OF THESE STORMS THIS EVENING THAT WILL CONTAIN STRONG WIND GUSTS, HAIL AND FREQUENT LIGHTNING. THESE STORMS ALSO HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL THAT COULD LEAD TO FLOODING IN AREAS OF POOR DRAINAGE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ450>453-032315- COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM- COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM- COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM- COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-454-455-032315- DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE- COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM- COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...TONIGHT. THERE IS THE POSSIBILITY OF THUNDERSTORMS THIS EVENING THAT MAY BE ACCOMPANIED BY STRONG WIND GUSTS, HAIL AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ001-MDZ008-NJZ016>019-PAZ070-071-101-102-104-032315- NEW CASTLE-CECIL-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON- DELAWARE-PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER- EASTERN MONTGOMERY- 711 PM EDT MON MAY 2 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE...NORTHEAST MARYLAND...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE AREA LATER THIS EVENING AND CONTINUE INTO TONIGHT. THESE STORMS HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL THAT COULD LEAD TO FLOODING IN AREAS OF POOR DRAINAGE AND PERHAPS ISOLATED FLASH FLOODING IN URBAN LOCALES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Dover AFB radar (KDOX), 60 km away, was scanning. The volume nearest the first event began at 01:19 UTC.
2 flood, 1 thunderstorm wind, 1 hail, 1 flash flood. Local standard time, as filed.
A large tree was knocked down near the intersection of St Michaels road and Doncaster road.
Hail reached the size of 1.25 inches with thunderstorms that moved through the area.
Heavy rain led to flash flooding and the closure of roads in both Easton and Cordova. 2.63 inches of rain fell in Easton and 2.65 inches of rain fell in Rio Vista.
Heavy rain from thunderstorms resulted in some high water on roadways with no road closures.
High water was reported near Rabbit Hill Rd and Route 309.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2016Every state in 2016This day in weather historyWarnings in Maryland, May 2016
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: 622532, 622534, 622538, 622539, 622540.