Alert archive / New Jersey / Areal Flood Advisories in 2009

Areal Flood Advisory 73, NWS Philadelphia/Mount Holly

August 22, 20096 counties in New Jersey; Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 22, 2009, 4:26 AM EDT for 6 counties in New Jersey; Kent County, Sussex County, Delaware. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Aug 22, 2009, 4:26 AM EDT (08:26 UTC)
Expired
Aug 22, 2009, 10:30 AM EDT
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Kent County, DE, Sussex County, DE, Atlantic County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 64 km from the middle of the area, began a volume at 08:28 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, 8.4 hours before the alert went out and 159 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 2009-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2017 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2009-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.1939Sfc1 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
2017 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
833 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

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 Aug 22, 4:21 AM EDT, 5 minutes earlier.

Area forecast discussion, Aug 22, 4:21 AM EDT, 5 minutes before
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Hazardous weather outlook, Aug 22, 3:15 AM EDT, 1 hour 11 minutes before
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In the hours before

Special weather statement, Aug 21, 11:14 PM EDT, 5 hours 12 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1114 PM EDT FRI AUG 21 2009

DEZ001-002-MDZ008-012-015-019-020-220445-
CAROLINE MD-CECIL MD-KENT MD-KENT DE-NEW CASTLE DE-QUEEN ANNES MD-
TALBOT MD-
1114 PM EDT FRI AUG 21 2009

...A STRONG THUNDERSTORM WILL AFFECT CAROLINE...CECIL...KENT...NEW
CASTLE...QUEEN ANNES AND TALBOT COUNTIES...

AT 1112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES SOUTHEAST OF CENTERVILLE...MOVING
NORTHEAST AT 30 MPH. THE THUNDERSTORM WILL BE NEAR MARYDEL...
HENDERSON AROUND 1130 PM...HARTLY...TEMPLEVILLE AROUND 1145 PM...
KENTON...CLAYTON AROUND MIDNIGHT...SMYRNA...CHAMBERSVILLE AROUND 1215
AM...ODESSA AND MOUNT PLEASANT AROUND 1230 AM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT INTENSE LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER
TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

RNS
Special weather statement, Aug 22, 12:20 AM EDT, 4 hours 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1220 AM EDT SAT AUG 22 2009

DEZ001-002-MDZ015-020-NJZ007>010-015>019-021-PAZ061-062-068>071-
220615-
BUCKS PA-CAMDEN NJ-CAROLINE MD-CUMBERLAND NJ-DELAWARE PA-
GLOUCESTER NJ-HUNTERDON NJ-KENT DE-LEHIGH PA-MERCER NJ-MONTGOMERY PA-
MORRIS NJ-NEW CASTLE DE-NORTHAMPTON PA-NORTHWESTERN BURLINGTON NJ-
PHILADELPHIA PA-QUEEN ANNES MD-SALEM NJ-SOMERSET NJ-WARREN NJ-
1220 AM EDT SAT AUG 22 2009

...STRONG THUNDERSTORMS SOME WITH HEAVY RAIN WILL AFFECT BUCKS...
BURLINGTON...CAMDEN...CAROLINE...CUMBERLAND...DELAWARE...
GLOUCESTER...HUNTERDON...KENT...LEHIGH...MERCER...MONTGOMERY...
MORRIS...NEW CASTLE...NORTHAMPTON...PHILADELPHIA...QUEEN ANNES...
SALEM...SOMERSET AND WARREN COUNTIES...

AT 1215 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED SHOWERS
AND STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 16 MILES
SOUTHEAST OF EASTON TO 14 MILES SOUTHWEST OF DOVER...MOVING
EAST-NORTHEAST AT 15 TO 20 MPH. THE THUNDERSTORMS WILL BE NEAR
LEBANON...CALIFON...SOUTH PHILADELPHIA...AND ABINGTON AROUND 1225
AM...LONG VALLEY...KENSINGTON...CENTER CITY...AND WEST DEPTFORD
AROUND 1230 AM.

VERY HEAVY RAINFALL WILL OCCUR OVER AREAS THAT RECEIVED HEAVY RAINS
EARLIER. BE ALERT FOR THE POSSIBILITY OF LOCALIZED FLOODING.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS...AS WELL AS
SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING.
Local storm report, Aug 22, 2:44 AM EDT, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
244 AM EDT SAT AUG 22 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0228 AM     FLASH FLOOD      3 S SOMERDALE           39.80N 75.02W
08/22/2009                   CAMDEN             NJ   AMATEUR RADIO

            FLASH FLOODING MINNETONKA RD IN HI-NELLA 3 FT OR WATER ON
            THE ROAD

&&

RNS
Local storm report, Aug 22, 4:20 AM EDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 1:28 AM EDTFlash Flood WarningPHICamden, Cumberland, Gloucester, Salem4 hr
Aug 22, 1:40 AM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 1 more3 hr
Aug 22, 3:36 AM EDTFlash Flood WarningPHISomerset4 hr
Aug 22, 5:42 AM EDTAreal Flood AdvisoryPHICamden, Cumberland, Gloucester, Salem3 hr
Aug 22, 9:01 AM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland3 hr
Aug 22, 6:02 PM EDTFlash Flood WarningPHIMercer4 hr
Aug 22, 6:21 PM EDTFlash Flood WarningPHIHunterdon, Warren3 hr
Aug 22, 6:32 PM EDTFlash Flood WarningPHICamden, Gloucester3 hr
Aug 22, 7:32 PM EDTRiver Flood WarningPHIMercer19 hr
Aug 21, 10:14 PM EDTAreal Flood AdvisoryPHIChester3 hr
Aug 21, 10:49 PM EDTFlash Flood WarningPHIChester55 min
Aug 22, 1:51 AM EDTFlash Flood WarningPHIMontgomery, Philadelphia77 min
Aug 22, 6:03 AM EDTFlash Flood WarningPHIMontgomery, Philadelphia3 hr
Aug 22, 7:00 PM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Aug 22, 2:19 AM EDTAreal Flood AdvisoryPHIKent6 hr
Aug 22, 8:12 AM EDTAreal Flood AdvisoryPHIKent3 hr
Aug 22, 6:02 PM EDTFlash Flood WarningPHIKent, New Castle, Sussex4 hr

Nearby

Areal Flood Advisories in New Jersey, 2009Areal Flood Advisories in Delaware, 2009Every areal flood advisory in 2009

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.