Alert archive / New Jersey / Areal Flood Advisories in 2011

Areal Flood Advisory 209, NWS Philadelphia/Mount Holly

November 29, 201110 counties in New Jersey; 10 counties in Pennsylvania; 5 counties in Maryland

NWS Philadelphia/Mount Holly issued this areal flood advisory at Nov 29, 2011, 4:27 PM EST for 10 counties in New Jersey; 10 counties in Pennsylvania; 5 counties in Maryland. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Nov 29, 2011, 4:27 PM EST (21:27 UTC)
Expired: Nov 29, 2011, 8:15 PM EST
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

All 25 counties

Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Salem County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 21:26 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.5 hours before the alert went out and 81 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 71 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, 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 this areal flood advisory went out at Nov 29, 3:25 PM EST, 1 hour 2 minutes earlier.

Area forecast discussion, Nov 29, 3:25 PM EST, 1 hour 2 minutes before

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Hazardous weather outlook, Nov 29, 3:27 PM EST, 1 hour before

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In the hours before

Special weather statement, Nov 29, 12:12 PM EST, 4 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1212 PM EST TUE NOV 29 2011

DEZ001>004-MDZ008-012-015-NJZ016-021-023-024-PAZ067-291815-
ATLANTIC COASTAL CAPE MAY NJ-CAPE MAY NJ-CECIL MD-CHESTER PA-
CUMBERLAND NJ-DELAWARE BEACHES DE-INLAND SUSSEX DE-KENT MD-KENT DE-
NEW CASTLE DE-QUEEN ANNE'S MD-SALEM NJ-
1212 PM EST TUE NOV 29 2011

...A LINE OF HEAVY SHOWERS WITH GUSTY WINDS WILL AFFECT PORTIONS OF
KENT...CECIL...SALEM...CUMBERLAND...CHESTER...QUEEN
ANNE'S...SUSSEX...NEW CASTLE AND CAPE MAY COUNTIES...

AT 1208 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY SHOWERS WITH GUSTY WINDS ALONG A LINE EXTENDING FROM 22 MILES
SOUTH OF LANCASTER TO 25 MILES SOUTHEAST OF GEORGETOWN...MOVING
NORTH AT 30 MPH.

ALONG MAINLY THE LEADING EDGE OF THIS LINE OF SHOWERS, WINDS WILL
GUST UP TO 40 MPH. USE CAUTION WHILE DRIVING, ESPECIALLY HIGH
PROFILE VEHICLES AND ACROSS BRIDGES AND OTHER ELEVATED SURFACES.

LAT...LON 3937 7608 3953 7599 3972 7624 3978 7607
      4010 7591 3906 7473 3899 7479 3898 7480
      3892 7498 3915 7490 3919 7518 3946 7555
      3958 7554 3958 7556 3946 7558 3924 7538
      3893 7530 3880 7516 3880 7507 3844 7505

FORECASTER: GORSE

Special weather statement, Nov 29, 12:48 PM EST, 3 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1248 PM EST TUE NOV 29 2011

DEZ001-002-NJZ016>018-021>024-PAZ060-067-068-070-071-291845-
ATLANTIC NJ-ATLANTIC COASTAL CAPE MAY NJ-BERKS PA-CAMDEN NJ-
CAPE MAY NJ-CHESTER PA-CUMBERLAND NJ-DELAWARE PA-GLOUCESTER NJ-
KENT DE-MONTGOMERY PA-NEW CASTLE DE-PHILADELPHIA PA-SALEM NJ-
1248 PM EST TUE NOV 29 2011

...A LINE OF HEAVY SHOWERS WITH GUSTY WINDS WILL AFFECT PORTIONS OF
KENT...SALEM...CUMBERLAND...CAMDEN...GLOUCESTER...DELAWARE...
PHILADELPHIA...CHESTER...MONTGOMERY...BERKS...NEW CASTLE...CAPE MAY
AND ATLANTIC COUNTIES...

AT 1245 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF HEAVY SHOWERS WITH GUSTY WINDS FROM NEAR HARRISBURG IN
SOUTHEASTERN PENNSYLVANIA TO NORTHERN DELAWARE THEN DOWN TO NEAR THE
LOWER DELAWARE BAY. THIS LINE IS MOVING NORTHWARD AT 30 MPH.

ALONG MAINLY THE LEADING EDGE OF THIS LINE OF HEAVIER SHOWERS, WINDS
WILL GUST UP TO 40 MPH. USE CAUTION WHILE DRIVING, ESPECIALLY HIGH
PROFILE VEHICLES AND TRAVELING ACROSS BRIDGES AND OTHER ELEVATED
SURFACES.

LAT...LON 4051 7643 4059 7603 4068 7592 3962 7480
      3928 7462 3929 7460 3896 7497 3916 7491
      3919 7518 3946 7555 3958 7556 3950 7558
      3920 7539 3920 7540 3963 7579 3972 7579
      3984 7604 4014 7590 4050 7644

FORECASTER: GORSE

Special weather statement, Nov 29, 2:05 PM EST, 2 hours 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
205 PM EST TUE NOV 29 2011

NJZ009-015-017>019-027-PAZ060>062-067>071-292000-
BERKS PA-BUCKS PA-CAMDEN NJ-CHESTER PA-DELAWARE PA-GLOUCESTER NJ-
HUNTERDON NJ-LEHIGH PA-MERCER NJ-MONTGOMERY PA-NORTHAMPTON PA-
NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-SOUTHEASTERN BURLINGTON NJ-
205 PM EST TUE NOV 29 2011

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT HUNTERDON...CAMDEN...
GLOUCESTER...MERCER...DELAWARE...PHILADELPHIA...CHESTER...
MONTGOMERY...BERKS...LEHIGH...NORTHAMPTON...BUCKS AND BURLINGTON
COUNTIES...

AT 202 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS WITH STRONG WIND GUSTS ALONG A LINE EXTENDING FROM 9 MILES
NORTHEAST OF READING TO 15 MILES NORTHEAST OF WEST CHESTER TO 10
MILES WEST OF PHILADELPHIA TO 10 MILES SOUTH OF CAMDEN...MOVING
EAST-NORTHEAST AT 25 MPH.

ALONG MAINLY THE LEADING EDGE OF THIS LINE OF HEAVIER SHOWERS, WINDS
WILL GUST UP TO 40 MPH. USE CAUTION WHILE DRIVING, ESPECIALLY HIGH
PROFILE VEHICLES AND TRAVELING ACROSS BRIDGES AND OTHER ELEVATED
SURFACES.

LAT...LON 3986 7447 3970 7521 4014 7558 4046 7599
      4063 7524 4030 7483

FORECASTER: HEAVENER

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 29, 12:12 PM EST	Special Weather Statement	PHI	Cape May, Cumberland, Salem	63 min
Nov 29, 12:48 PM EST	Special Weather Statement	PHI	Cape May, Cumberland, Gloucester, Salem	57 min
Nov 29, 2:05 PM EST	Special Weather Statement	PHI	Burlington, Camden, Gloucester	55 min

Nearby

Areal Flood Advisories in New Jersey, 2011 Areal Flood Advisories in Pennsylvania, 2011 Areal Flood Advisories in Maryland, 2011 Every areal flood advisory in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.