Alert archive / New Jersey / Coastal Flood Statements in 2011

Coastal Flood Statement 12, NWS Philadelphia/Mount Holly

April 17, 2011Delaware County, Philadelphia County, Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this coastal flood statement at Apr 17, 2011, 10:35 PM EDT for Delaware County, Philadelphia County, Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Apr 17, 2011, 10:35 PM EDT (02:35 UTC)
Expired
Apr 18, 2011, 3:47 AM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 02:32 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.6 hours before the alert went out and 207 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 00:00Z on 2011-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2011-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2319 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

856 
WHUS41 KPHI 180235
CFWPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1035 PM EDT SUN APR 17 2011

...SPOTTY MINOR TIDAL FLOODING POSSIBLE...

DEZ001-NJZ016>019-PAZ070-071-180800-
/O.NEW.KPHI.CF.S.0012.110418T0235Z-110418T0800Z/
NEW CASTLE-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-
DELAWARE-PHILADELPHIA-
1035 PM EDT SUN APR 17 2011

THE UPCOMING HIGH TIDE CYCLE IS PRODUCING TIDES A LITTLE HIGHER
THAN NORMAL. THE DEPARTURES ARE FALLING...BUT NONETHELESS...THERE
MAY BE SOME SPOTTY MINOR TIDAL FLOODING ALONG THE TIDAL PORTION
OF THE DELAWARE RIVER OVERNIGHT. THE HIGH TIDE OCCURS AT PHILADELPHIA
AT AROUND 200 AM.

$$
1 follow-up statement
122 
WHUS41 KPHI 180747
CFWPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
347 AM EDT MON APR 18 2011

...MINOR TIDAL FLOODING THREAT HAS PASSED...

DEZ001-NJZ016>019-PAZ070-071-180900-
/O.CAN.KPHI.CF.S.0012.000000T0000Z-110418T0800Z/
NEW CASTLE-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-
DELAWARE-PHILADELPHIA-
347 AM EDT MON APR 18 2011

THE HIGH TIDE HAS OCCURRED ALONG THE TIDAL DELAWARE. THE THREAT
FOR MINOR TIDAL FLOODING HAS PASSED. 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 4:05 PM EDTCoastal Flood StatementPHIDelaware, Philadelphia12 hr
Apr 18, 8:28 AM EDTAreal Flood WarningPHIMorris31 hr
Apr 18, 10:39 AM EDTSmall Craft Advisory for Hazardous SeasPHI5 hr
Apr 18, 3:50 PM EDTSmall Craft AdvisoryPHI19 hr

Nearby

Coastal Flood Statements in New Jersey, 2011Coastal Flood Statements in Pennsylvania, 2011Coastal Flood Statements in Delaware, 2011Every coastal flood statement 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.