Astronomical Low Tide, Delaware
- When
- January 10, 10:00 AM EST to 12:00 PM EST
- Where
- Delaware forecast zone
- Reported by
- WLON
- Coordinates
- 39.917, -75.399 (the zone’s center; the record gives no point)
Astronomical Low Tide in Pennsylvania, January 10, 2015
A persistent and strong northwest flow that started following a secondary cold frontal passage during the late afternoon on the 9th caused blowout tide conditions during the daytime low tide cycle on the 10th along the tidal Delaware River and its tributaries. 15 feet below mean lower low water.
Where it happened
Every event with a place to put it; 2 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 2
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 persistent and strong northwest flow that started following a secondary cold frontal passage during the late afternoon on the 9th caused blowout tide conditions during the daytime low tide cycle on the 10th along the tidal Delaware River and its tributaries. At Marcus Hook (Delaware County), the lowest tide reached 2.15 feet below mean lower low water. In Philadelphia, the lowest tide reached 2.29 feet below mean lower low water. Blowout tide conditions start at 1.80 feet below mean lower low water. As the day progressed on the 10th, the northwest winds started to decrease and backed more toward the west. Subsequent low tide cycles did not reach blowout tide conditions.
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 Jan 10, 9:39 AM EST, 21 minutes earlier.
Area forecast discussion, Jan 10, 9:39 AM EST, 21 minutes before
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</html>Hazardous weather outlook, Jan 10, 4:14 AM EST, 5 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 414 AM EST SAT JAN 10 2015 NJZ001-PAZ054-055-110915- SUSSEX-CARBON-MONROE- 414 AM EST SAT JAN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY AND NORTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. A WINTRY MIX IS EXPECTED LATE SUNDAY NIGHT INTO MONDAY. AN ACCUMULATION OF SNOW AND ICE EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NJZ007>010-012-PAZ060>062-101-103-105-110915- WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-BERKS-LEHIGH-NORTHAMPTON- WESTERN CHESTER-WESTERN MONTGOMERY-UPPER BUCKS- 414 AM EST SAT JAN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. A WINTRY MIX IS EXPECTED LATE SUNDAY NIGHT INTO MONDAY. A LIGHT ACCUMULATION OF SNOW AND ICE EXPECTED IS LIKELY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DEZ001>004-MDZ008-012-015-019-020-NJZ013>027-PAZ070-071-102-104-106- 110915- NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD- QUEEN ANNES-TALBOT-CAROLINE-WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER- SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND- ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC- COASTAL OCEAN-SOUTHEASTERN BURLINGTON-DELAWARE-PHILADELPHIA- EASTERN CHESTER-EASTERN MONTGOMERY-LOWER BUCKS- 414 AM EST SAT JAN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. A BRIEF PERIOD OF WINTRY MIX IS EXPECTED LATE SUNDAY NIGHT INTO EARLY MONDAY. A LIGHT ACCUMULATION OF ICE IS POSSIBLE. ANOTHER PERIOD OF WINTRY PRECIPITATION IS POSSIBLE ON THURSDAY AND THURSDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-450>455-110915- 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- 414 AM EST SAT JAN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...TODAY AND TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The radar
The national radar mosaic for the moment the first event began.
Event by event
2 astronomical low tide. Local standard time, as filed.
Astronomical Low Tide, Philadelphia
- When
- January 10, 11:00 AM EST to 1:00 PM EST
- Where
- Philadelphia forecast zone
- Reported by
- WLON
- Coordinates
- 40.008, -75.134 (the zone’s center; the record gives no point)
What these are
- Astronomical Low Tide
- Unusually low water from tides and offshore wind that caused impacts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Drought in Kentucky, January 10 to 31, 2015
- Astronomical Low Tide in New Jersey, January 10, 2015
- Cold in North Carolina, January 10, 2015
- Winter Storm in Texas, January 10, 2015
- Winter Weather in Texas, January 10, 2015
- Winter Weather in Colorado, January 10 to 11, 2015
- Cold in Pennsylvania, January 10, 2015
- Astronomical Low Tide in Delaware, January 10, 2015
More
Every storm in Pennsylvania in 2015Every state in 2015This day in weather historyWarnings in Pennsylvania, January 2015
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 2026-10-01. Each event’s entry at NCEI: 553354, 553355.