Pennsylvania, 2013

Winter Storm and Winter Weather in Pennsylvania, March 18 to 19, 2013

March 18 to 19, 2013 · NWS PHI · 9 events in 9 counties and zones

A wintry mix of precipitation affected most of Eastern Pennsylvania except for Philadelphia and its immediate suburbs from the afternoon of the 18th into the morning of the 19th. In Berks County, the Lehigh Valley and the Poconos, snowfall averaged two to six inches and ice accretions average one to three tenths of an inch, highest in the southern Poconos.

Where it happened

Every event with a place to put it; 9 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
9

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.

What happened

The episode as NWS PHI wrote it up.

A wintry mix of precipitation affected most of Eastern Pennsylvania except for Philadelphia and its immediate suburbs from the afternoon of the 18th into the morning of the 19th. In Berks County, the Lehigh Valley and the Poconos, snowfall averaged two to six inches and ice accretions average one to three tenths of an inch, highest in the southern Poconos. In the Philadelphia northern suburbs snowfall averaged around an inch and little if any snow accumulated toward Philadelphia. Untreated roadways were hazardous. It was snowing heavily during the evening commute on the 18th.

Precipitation started as snow during the mid to late afternoon on the 18th and fell at its heaviest during that evening commute. In the Philadelphia northern suburbs and Berks County, the snow changed to rain by the middle of that evening. In the Lehigh Valley and Poconos, the snow changed to sleet and then to freezing rain that evening. In the Lehigh Valley, the freezing rain changed to plain rain early on the 19th, but a wintry mix of snow, sleet and freezing rain persisted in the Poconos until precipitation ended on the morning of the 19th. Travel was particularly difficult in the Poconos and accidents were reported in Monroe County. Traffic was reported as difficult along Pennsylvania State Routes 115 and 715 and U.S. Route 209.

Representative snowfall included 6.0 inches in Summit Hill and Lake Harmony in Carbon County, 5.8 inches in Tobyhanna (Monroe County), 5.0 inches in Mount Pocono (Monroe County), 4.0 inches in Bowmanstown (Carbon County) and New Tripoli and Schnecksville in Lehigh County, 3.5 inches in Saylorsburg (Monroe County), 3.2 inches in Bethlehem (Northampton County) and Jim Thorpe (Carbon County), 3.0 inches in Bernville (Berks County) and Danielsville (Northamptobn County), 2.7 inches in East Stroudsburg (Monroe County), 2.5 inches in Martins Creek (Northampton County), 2.3 inches in Reading (Berks County), 1.9 inches at the Lehigh Valley International Airport, 1.5 inches in Glendon (Northampton County), 1.3 inches in Elverson (Chester County), 1.2 inches in Gilbertsville (Montgomery County) and 1.0 inch in Doylestown (Bucks County) and Harleysville (Montgomery County). Representative ice accumulations included 0.3 of an inch in Pocono Summit (Monroe County), 0.25 inches in Stormville (Monroe County) and 0.1 inches in Summit Hill (Carbon County).

The wintry weather was caused by a low pressure system that moved from the Southern Plains on the morning of the 17th eastnortheast and reached the Tennessee Valley on the morning of the 18th and the Ohio Valley on the evening of the 18th. A secondary low pressure system formed on the system's warm front along the Carolina coast overnight on the 18th. This low slowly became the primary low pressure system as it moved northeast and passed east of the New Jersey coast on the morning of the 19th. A high pressure system paralleled the track of the low as it moved from the Great Lakes on the morning of the 17th and into New England on the morning of the 18th. It kept initially dry and then sufficiently cold air in place near the surface to perpetuate the wintry precipitation, especially in the Poconos.

What forecasters said that day

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 Mar 18, 8:36 AM EST, 5 hours 24 minutes earlier.

Area forecast discussion, Mar 18, 8:36 AM EST, 5 hours 24 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
936 AM EDT MON MAR 18 2013

.SYNOPSIS...
WEAK LOW PRESSURE ALONG THE NORTH CAROLINA COAST THIS MORNING WILL
DEVELOP STEADILY INTO A SIGNIFICANT LOW PRESSURE SYSTEM BY THE TIME
IT PASSES JUST EAST OF NEW JERSEY TUESDAY MORNING...ON ITS WAY TO
MAINE BY WEDNESDAY. IN THE MEANTIME...A NEW AREA OF LOW PRESSURE
FORMS ON A SECONDARY COLD FRONT CROSSING THE MID ATLANTIC COAST
WEDNESDAY EVENING. THAT LOW MOVES EAST OF NEW ENGLAND BY THURSDAY.
EXTENSIVE HIGH PRESSURE CENTERED IN NORTHERN CANADA WILL DOMINATE
MUCH OF NORTH AMERICA FRIDAY AND SATURDAY. LOW PRESSURE DEVELOPING
ALONG THE GULF COAST NEXT WEEKEND WILL NEED TO BE MONITORED FOR A
POSSIBLE TURN UP THE COAST EARLY NEXT WEEK.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
BASED ON RADAR AND SFC OBSERVATIONS...HAVE SCALED BACK POPS
THROUGH THE NEXT SEVERAL HOURS. PRECIPITATION IS HAVING A
DIFFICULT TIME REACHING THE GROUND THROUGH THE DRY AIR ABOVE THE
SURFACE...AND IT MAY TAKE A LITTLE LONGER THAN PREVIOUSLY
ADVERTISED FOR THE COLUMN TO MOISTEN SUFFICIENTLY. HEADLINES WILL
REMAIN THE SAME FOR NOW...ALTHOUGH WE WILL CONTINUE TO RE-EXAMINE
THE SITUATION AND MAKE ANY NECESSARY ADJUSTMENTS AS THE EVENT
UNFOLDS. ANY PRECIPITATION THAT FALLS DURING THE NEXT FEW HOURS
SHOULD BE VERY LIGHT.

HIGH PRESSURE WELL TO THE NORTH CONTINUES TO MOVE AWAY FROM THE
AREA. LOW PRESSURE ACROSS THE GREAT LAKES AND OHIO VALLEY WILL
CONSOLIDATE ACROSS THE LOWER LAKES TONIGHT. THE FRONTS ASSOCIATED
WITH THESE LOW PRESSURE AREAS WILL AFFECT OUR WEATHER TODAY.
MOISTURE WILL CONTINUE TO OVERSPREAD THE AREA TODAY WITH PCPN
BEGINNING ACROSS THE DELMARVA BY MID MORNING AND THEN SPREADING
NORTH/EAST THIS AFTERNOON. THE PCPN WILL BE MOSTLY RAIN S/E OF I-95
AND MOSTLY SN/IP MIX NORTH AND WEST OF METRO PHILADELPHIA. LIGHT TO
MODERATE ACCUMS OF SNOW AND ICE WILL LEAD US TO CONTINUE THE WWA
FLAGS ACROSS THE AREAS TODAY AND TONIGHT. THE SLIGHTLY LATER ONSET
TIMES MAY FAVOR LESS SNOW THAN THE PREVIOUS FCST...BUT SNOW TOTALS
WERE NOT TRIMMED MUCH FROM EARLIER. HIGH TEMPERATURES WERE MOSTLY
MAV/MOS BASED.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM TUESDAY/...
A WEAK AREA OF LOW PRESSURE WILL MOVE ALONG THE COLD FRONT AND CROSS
THE REGION LATE. THIS WILL BRING A CONTINUATION OF RAIN (SNOW
FARTHEST NORTH) TONIGHT. THE RAINFALL MAY BE MODERATE INTO THE
EVENING WITH TOTAL QPF NEAR AN INCH POSSIBLE. LOW TEMPERATURES
TONIGHT WILL BE IN THE MID TO UPPER 30S S/E AND LOW 30S N/W. WINDS
WILL SHIFT FROM ONSHORE DIRECTION BACK TO WRLY/SWRLY BY DAWN TUE.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
**DELAYED SPRING AS WINTRY WEATHER WILL CONTINUE AT TIMES HERE
 THIS WEEK AND POSSIBLY NEXT**

500MB: CLOSED LOW SHORT WAVE OVER LSUPR GOES NEGATIVE AS IT MOVES TO
QUEBEC WEDNESDAY...ROTATING A STRONG SHORT WAVE ACROSS OUR REGION
LATE WEDNESDAY THAT PULLS THE LARGE CLOSED LOW OVER TO NOVA SCOTIA
BY FRIDAY. IT CONTINUES EAST INTO THE ATLANTIC OVER THE WEEKEND
WHILE A NEW STRONG TROUGH DEVELOPS OVER THE MID MISSISSIPPI VALLEY
ON SUNDAY.

CALENDAR DAY AVERAGE TEMPERATURES: NEAR NORMAL TUESDAY...5 TO 10
DEGREES BELOW NORMAL WEDNESDAY...10 TO 15 DEGREES BELOW NORMAL
THURSDAY...10 DEGREES BELOW NORMAL FRIDAY...5 TO 10 DEGREES BELOW
NORMAL SATURDAY AND JUST A LITTLE BELOW NORMAL SUNDAY.

THE DAILIES BELOW...

00Z/18 NCEP 50 50 BLENDED NCEP MOS GUIDANCE (GFS/NAM) TUE AND WED
THEN A SEAMLESS BLENDED INTO THE 06Z/18 WPC (FORMERLY HPC) D4-7 UPDATE...
UNLESS SIGNIFICANT SPECIFIC MODEL ADJUSTMENTS ARE OTHERWISE
NOTED.

TUESDAY...LEFTOVER MORNING RAIN /ICE FAR NW/ ENDS. BECOMING BREEZY
TUESDAY AFTERNOON WITH CLEARING AND POSSIBLY THE MILDEST TEMPERATURES
OF THE WEEK. W WIND GUSTY 25 TO 30 MPH.

WEDNESDAY...A SECONDARY CFP IN THE EVENING AS LOW PRESSURE FORMS
ON THE FRONT OVER THE MID ATLC STATES. THERE SEEMS TO ME TO BE A
PROBABLE PERIOD OF SHOWERS LATE IN THE AFTN OR MORE LIKELY AT NIGHT
THAT COULD BE MEASURABLE SNOW FROM KRDG TO KABE NORTHWARD THROUGH
THE POCONOS AND NW NJ AND MOSTLY RAIN SHOWERS ENDING AS SNOW
SHOWERS ELSEWHERE. WEST WIND GUSTY 20 TO 25 MPH EARLY WEDNESDAY WITH
WIND BACKING TO SSW G15 MPH LATE IN THE DAY AS LOW LVL LAPSE RATES
INCREASE CONSIDERABLY AND MOISTEN ENOUGH TO PRODUCE BANDS OR CLUSTERS
OF SHOWERS AT DAYS END. WSHIFT NW LATER AT NIGHT AS SKIES CLEAR FM
NW TO SE LATE AT NIGHT.

THURSDAY AND FRIDAY...FAIR AND COLDER WITH WNW WIND G 20-25 MPH
DURING THE DAYLIGHT HOURS.

SATURDAY...FAIR AND NOT QUITE AS COLD.

SUNDAY...UNCERTAINTY BUT PROBABLY A NORTH WIND AND FAIR SKIES. NOT
QUITE AS COLD. MONITORING THE NORTHERN FRINGE OF A GULF COAST LOW
AND ITS FUTURE PATH EARLY NEXT WEEK.

CONFIDENCE IN THE ENTIRE LONG TERM FORECAST DETAILS AND REASONING
DESCRIBED ABOVE ARE NOT QUITE AS HIGH AS I'D LIKE. CHANGES ARE
OCCURRING IN THE FCST EXPECTATIONS AS SHORT WAVES WITHIN THIS
BLOCKED FLOW ARE MORE DEFINITIVELY ENSEMBLED MIDWEEK AND EARLY
NEXT WEEK.

&&

.AVIATION /14Z MONDAY THROUGH FRIDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.

VFR CONDITIONS CONTINUE AT THE TERMINALS THIS MORNING BUT CEILINGS
ARE STARTING TO LOWER TO THE SOUTH AND WEST OF THE REGION. MVFR
CONDITIONS WILL START TO ARRIVE BY LATE MORNING AT THE SOUTHERN
SITES AND THEN SPREAD NORTHWARD THROUGH THIS AFTERNOON AS THE WARM
FRONT AND LOW PRESSURE ALONG IT AFFECT THE AREA.

WE SLOWED DOWN THE ONSET OF PRECIPITATION AS RADAR RETURNS ARE
SHOWING A DRY SLOT FORMING TO OUR WEST. A FEW FLURRIES OR LIGHT
RAIN SHOWERS MAY OCCUR THROUGH THIS MORNING ALTHOUGH WITH THE DRY
AIR IN PLACE MOSTLY VIRGA WILL REMAIN AROUND THE REGION. THE BULK
OF THE PRECIPITATION IS EXPECTED TOWARD THIS AFTERNOON AND
EVENING. PCPN WILL MOVE FROM SOUTH TO NORTH TODAY WITH MOSTLY RAIN
S/E (SOME -PL POSSIBLE AT ONSET) AND MOSTLY -SN N/W CHANGING TO
RAIN LATE THIS AFTERNOON WITH SOME PL DURING THE TRANSITION.
MOSTLY ALL RAIN TONIGHT WITH SOME -SN ACROSS THE FAR NORTH/WEST.
MOSTLY IFR CONDITIONS TONIGHT WITH LOW CIGS/VSBYS AND FOG
POSSIBLE.

OUTLOOK...
TUESDAY MORNING AFTER 12Z...IFR. LEFTOVER MORNING RAIN, EXCEPT
POSSIBLE ICE POCONOS INTO FAR NW NJ N OF RTE 80. LIGHT WIND.

TUE AFTN/EVE...VFR SCT-BKN AOA 4000 FT, EXCEPT NORTHWEST TERMINALS
WHERE ISOLATED SHOWERS IN DEVELOPING GUSTY W FLOW TO AT LEAST 25
KTS COULD DELIVER BRIEF MVFR.

TUE NIGHT...MAINLY VFR WITH FEW OR SCT CLOUDS AOA 5000. EXCEPTION
POCONOS WHERE MVFR CONDS IN A SNOW SHOWER MAY OCCUR.  GUSTY WNW WIND
20-25 KTS.

WEDNESDAY...VFR TO START WITH CIGS AOA 5000 FT DEVELOPING IN THE
AFTN.  POSSIBLE BRIEF MVFR/IFR CONDS IN SHOWERS DURING LATE AFTN/EVE
WHICH WOULD PROBABLY BE RAIN OR RAIN CHANGING TO SNOW SHOWERS
EXCEPTING KRDG/KABE NORTHWARD WHERE MOSTLY SNOW SHOWERS ARE
ENVISIONED. W WIND 20-25 KTS TO START THE DAY WEDNESDAY BECOMING
LIGHT SOUTH LATE IN THE DAY THEN A WSHIFT TO NW DURING WED
EVENING. SOME INDICATIONS OF LARGE DENDRITIC GROWTH SNOW FOR THE
SHOWERY BANDS.

THURSDAY AND FRIDAY...VFR WITH SCT-BKN CLOUDS AOA 5000 FT AND A WNW
WIND G 20-25 KTS EACH AFTN. EXCEPTION...BRIEF POSSIBLE MVFR CONDS
IN SNOW SHOWERS POCONOS.

&&

.MARINE...
WE WILL CONTINUE WITH THE SCA FLAGS AS PER THE PREVIOUS FCST. SCA
CONDITIONS FOR GUSTS WILL BEGIN ACROSS THE SOUTHERN COASTAL WATERS
AND LOWER DEL BAY EARLY THIS MORNING AND THEN LATER THIS MORNING
ACROSS THE NORTHERN WATERS. GUSTS AROUND 25 TO 30 KTS EXPECTED.
PRECIPITATION...MOSTLY RAIN WILL MOVE FROM SOUTH TO NORTH TODAY AND
BE ACROSS THE WATERS INTO TONIGHT. AREAS OF FOG WILL DEVELOP ON THE
WATERS TONIGHT. WINDS WILL BE MOSTLY E/SE TODAY AND THEN SHIFT TO
SRLY TONIGHT AS LOW PRESSURE AND ITS ASSOCIATED FRONTS CROSS THE
WATERS.

OUTLOOK...
TUESDAY INTO WEDNESDAY...SCA'S EXPECTED. GALES POSSIBLE TUESDAY
NIGHT AND WED MORNING. NCEP MODELS ARE NOT AGREEING ON THE GALE
LOCATION SO HELD OFF ON ANY GALE WATCH ON THIS SHIFT.

THURSDAY AND FRIDAY...SCA WNW FLOW DEVELOPS THURSDAY...TIMING
UNCERTAIN BEHIND THE RAPIDLY DEVELOPING BUT NEWD DEPARTING NJ COAST
LOW. CERTAINLY NW SCA BY THU NIGHT AND PROBABLY LASTS ALL DAY FRIDAY.
SMALL CHANCE BRIEF GALE THU NIGHT.

&&

.HYDROLOGY...
I95 CORRIDOR IS STILL A SMALL CONCERN FOR ISOLATED SMALL STREAM
FLOODING LATER TONIGHT. TOMORROW...ANY POSSIBLE MINOR SMALL STREAM
FLOODING RECEDES WITH LARGER MAINSTEMS IN NJ ON THE RISE BUT
WITHIN BANKFULL. THIS ALL DEPENDS ON HOW MUCH RAIN FALLS THIS
COMING MONDAY NIGHT ALONG AND JUST SE OF THE I95 CORRIDOR.
1 INCH IN 6 HOURS WOULD BE A PROBLEM FOR SOME OF THE FLASHIER
SMALL STREAMS ALONG THE I95 CORRIDOR AND IF WE GET BASIN AVG OF
1.5 INCHES IN CENTRAL NEW JERSEY..THE MILLSTONE WOULD RESPOND.
RFALL TONIGHT IS THE GUIDE ON THE STREAM/RIVER RESPONSE.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...WINTER WEATHER ADVISORY FROM 2 PM THIS AFTERNOON TO 8 AM EDT
     TUESDAY FOR PAZ054-055-060>062.
NJ...WINTER WEATHER ADVISORY FROM 2 PM THIS AFTERNOON TO 8 AM EDT
     TUESDAY FOR NJZ001-007-008.
DE...NONE.
MD...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT TUESDAY FOR ANZ431-452>455.
     SMALL CRAFT ADVISORY UNTIL 6 PM EDT TUESDAY FOR ANZ450-451.
     SMALL CRAFT ADVISORY FROM 1 PM TUESDAY TO 6 AM EDT WEDNESDAY
     FOR ANZ430.

&&

SYNOPSIS...DRAG
NEAR TERM...MIKETTA
SHORT TERM...O'HARA
LONG TERM...DRAG
AVIATION...DRAG/MEOLA/O'HARA
MARINE...DRAG/O'HARA
HYDROLOGY...
Hazardous weather outlook, Mar 18, 4:26 AM EST, 9 hours 34 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
526 AM EDT MON MAR 18 2013

NJZ001-PAZ054-055-190930-
SUSSEX-CARBON-MONROE-
526 AM EDT MON MAR 18 2013

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO
8 AM EDT TUESDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY AND
NORTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WINTER WEATHER ADVISORY.

THERE IS A CHANCE THAT THIS ADVISORY WILL NEED TO BE UPGRADED TO A
WARNING IN FORECASTS ISSUED LATER TODAY. THE CONCERN BEING THE AMOUNT
OF GLAZING THAT COULD OCCUR TONIGHT....ESPECIALLY IN NORTHERN
SUSSEX COUNTY NEW JERSEY AND THE HIGHER TERRAIN OF MONROE COUNTY
PENNSYLVANIA.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WINTER WEATHER ADVISORY.

SNOW SHOWERS ARE POSSIBLE WEDNESDAY NIGHT THAT COULD DEPOSIT AN
INCH OF SNOW IN A FEW SPOTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NJZ007-008-PAZ060>062-190930-
WARREN-MORRIS-BERKS-LEHIGH-NORTHAMPTON-
526 AM EDT MON MAR 18 2013

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO
8 AM EDT TUESDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY AND EAST
CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WINTER WEATHER ADVISORY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WINTER WEATHER ADVISORY.

SNOW SHOWERS ARE POSSIBLE WEDNESDAY NIGHT THAT COULD DEPOSIT AN
INCH OF SNOW IN A FEW HIGHER TERRAIN LOCATIONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NJZ009-010-PAZ101-103-105-190930-
HUNTERDON-SOMERSET-WESTERN CHESTER-WESTERN MONTGOMERY-UPPER BUCKS-
526 AM EDT MON MAR 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW
JERSEY...NORTHWEST NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

A BIT OF SNOW IS POSSIBLE TODAY. IF SNOW OCCURS...MOST OF THE IT
WOULD FALL BETWEEN NOON AND 4 PM. SINCE TEMPERATURES WILL BE ABOVE
FREEZING IT SHOULD MELT ON PAVEMENT WITH ONLY A SMALL CHANCE OF SNOW
RELATED SLIPPERY SPOTS IN WESTERN CHESTER AND WESTERN MONTGOMERY
COUNTIES OF SOUTHEAST PENNSYLVANIA.

OF GREATER CONCERN IS THE REGION FROM UPPER BUCKS COUNTY INTO NORTHERN
HUNTERDON AND NORTHERN SOMERSET COUNTIES OF NEW JERSEY WHERE A PERIOD
OF ACCUMULATING SNOW LATE TODAY CHANGING TO SLEET AND FREEZING
RAIN WILL AFFECT THE EVENING COMMUTE. AN UPGRADE TO A SHORT DURATION
ADVISORY MAY BE NEEDED THERE IN LATER FORECASTS. TEMPERATURES WILL
RISE THROUGH THE 30S TONIGHT AND SO THE RISK OF ICING IN THOSE COUNTIES
WILL END BY MIDNIGHT.

A PERIOD OF HEAVY RAIN IS EXPECTED OVERNIGHT WHICH MAY CAUSE POCKETS
OF POOR DRAINAGE FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

SCATTERED SHOWERS LATE WEDNESDAY SHOULD CHANGE TO SCATTERED SNOW
SHOWERS WEDNESDAY NIGHT AND POSSIBLY CAUSE A FEW SLIPPERY SPOTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ001-NJZ012-013-015>019-PAZ070-071-102-104-106-190930-
NEW CASTLE-MIDDLESEX-WESTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-DELAWARE-PHILADELPHIA-EASTERN CHESTER-
EASTERN MONTGOMERY-LOWER BUCKS-
526 AM EDT MON MAR 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE...CENTRAL
NEW JERSEY...NORTHERN NEW JERSEY...SOUTHERN NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

A BIT OF SNOW IS POSSIBLE TODAY. IF SNOW OCCURS...MOST OF THE IT
WOULD FALL BETWEEN NOON AND 4 PM. SINCE TEMPERATURES WILL BE ABOVE
FREEZING IT SHOULD MELT ON PAVEMENT WITH ONLY A SMALL CHANCE OF SNOW
RELATED SLIPPERY SPOTS IN THE HILLS IMMEDIATELY WEST AND NORTHWEST
OF METRO PHILADELPHIA.

A PERIOD OF HEAVY RAIN IS EXPECTED TONIGHT WHICH MAY CAUSE POCKETS
OF POOR DRAINAGE FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

SCATTERED SHOWERS LATE WEDNESDAY SHOULD CHANGE TO SCATTERED SNOW
SHOWERS WEDNESDAY NIGHT AND POSSIBLY CAUSE A FEW SLIPPERY SPOTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MDZ008-012-015-019-020-190930-
CECIL-KENT MD-QUEEN ANNES-TALBOT-CAROLINE-
526 AM EDT MON MAR 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND.

.DAY ONE...TODAY AND TONIGHT.

ANY SNOW THIS MORNING WILL QUICKLY CHANGE TO RAIN AND NO
ACCUMULATION IS EXPECTED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ002>004-NJZ014-020>027-190930-
KENT-INLAND SUSSEX-DELAWARE BEACHES-EASTERN MONMOUTH-OCEAN-
CUMBERLAND-ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-
COASTAL ATLANTIC-COASTAL OCEAN-SOUTHEASTERN BURLINGTON-
526 AM EDT MON MAR 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...SOUTHERN
DELAWARE...CENTRAL NEW JERSEY AND SOUTHERN NEW JERSEY.

.DAY ONE...TODAY AND TONIGHT.

ANY SNOW DURING MIDDAY WILL QUICKLY CHANGE TO RAIN AND NO ACCUMULATION
IS EXPECTED.

A PERIOD OF HEAVY RAIN IS POSSIBLE TONIGHT WHICH MAY CAUSE
POCKETS OF POOR DRAINAGE FLOODING.

DENSE FOG IS POSSIBLE LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

ANZ430-431-450>455-190930-
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 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-
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-
526 AM EDT MON MAR 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND
DELAWARE BAY WATERS.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

GALE FORCE GUSTS ARE POSSIBLE TUESDAY NIGHT INTO WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

..UPDATED TODAY..

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

7 winter weather, 2 winter storm. Local standard time, as filed.

Winter Storm, Monroe

When
March 18, 2:00 PM EST to March 19, 10:00 AM EST
Where
Monroe forecast zone
Reported by
Trained Spotter
Coordinates
41.058, -75.339 (the zone’s center; the record gives no point)

Winter Storm, Carbon

When
March 18, 2:00 PM EST to March 19, 10:00 AM EST
Where
Carbon forecast zone
Reported by
Trained Spotter
Coordinates
40.918, -75.709 (the zone’s center; the record gives no point)

Winter Weather, Berks

When
March 18, 3:00 PM EST to 8:00 PM EST
Where
Berks forecast zone
Reported by
CoCoRaHS
Coordinates
40.416, -75.926 (the zone’s center; the record gives no point)

Winter Weather, Lehigh

When
March 18, 3:00 PM EST to March 19, 1:00 AM EST
Where
Lehigh forecast zone
Reported by
CoCoRaHS
Coordinates
40.613, -75.592 (the zone’s center; the record gives no point)

Winter Weather, Northampton

When
March 18, 3:00 PM EST to March 19, 1:00 AM EST
Where
Northampton forecast zone
Reported by
CoCoRaHS
Coordinates
40.754, -75.307 (the zone’s center; the record gives no point)

Winter Weather, Western Chester

When
March 18, 4:00 PM EST to 7:00 PM EST
Where
Western Chester forecast zone
Reported by
CoCoRaHS
Coordinates
39.973, -75.748 (the zone’s center; the record gives no point)

Winter Weather, Western Montgomery

When
March 18, 4:00 PM EST to 7:00 PM EST
Where
Western Montgomery forecast zone
Reported by
CoCoRaHS
Coordinates
40.211, -75.367 (the zone’s center; the record gives no point)

Winter Weather, Lower Bucks

When
March 18, 4:00 PM EST to 7:00 PM EST
Where
Lower Bucks forecast zone
Reported by
CoCoRaHS
Coordinates
40.337, -75.107 (the zone’s center; the record gives no point)

Winter Weather, Upper Bucks

When
March 18, 4:00 PM EST to 11:00 PM EST
Where
Upper Bucks forecast zone
Reported by
CoCoRaHS
Coordinates
40.337, -75.107 (the zone’s center; the record gives no point)

What these are

Winter Storm
A storm that brought snow, sleet or freezing rain at warning levels, usually over several hours or days.
Winter Weather
Snow, sleet or freezing rain below warning levels that still caused disruption, damage or casualties.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Pennsylvania in 2013Every state in 2013This day in weather historyWarnings in Pennsylvania, March 2013

Sources

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: 441335, 441336, 441332, 441333, 441334, 441328, 441329, 441330, 441331.