Alert archive / Delaware / Areal Flood Advisories in 2009
Areal Flood Advisory 59, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 12, 2009, 4:16 PM EDT for Kent County, Delaware. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2009, 4:16 PM EDT (20:16 UTC)
- Expired
- Aug 12, 2009, 7:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Kent County, DE
The radar
The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 20:16 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 12:00Z, 8.3 hours before the alert went out and 130 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.
- Mixed-layer CAPE
- 2266 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.4
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 12, 2:58 PM EDT, 1 hour 18 minutes earlier.
Area forecast discussion, Aug 12, 2:58 PM EDT, 1 hour 18 minutes before
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</html>Hazardous weather outlook, Aug 12, 3:03 PM EDT, 1 hour 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 303 PM EDT WED AUG 12 2009 DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-055- 060>062-067>071-131915- NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD- QUEEN ANNES-TALBOT-CAROLINE-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET- MIDDLESEX-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-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- 303 PM EDT WED AUG 12 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. ANZ430-431-450>455-131915- 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- 303 PM EDT WED AUG 12 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND DELAWARE BAY WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Aug 12, 11:26 AM EDT, 4 hours 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1126 AM EDT WED AUG 12 2009 NJZ012-015-121630- MERCER NJ-MIDDLESEX NJ- 1126 AM EDT WED AUG 12 2009 ...A STRONG THUNDERSTORM WILL AFFECT MERCER AND MIDDLESEX COUNTIES... AT 1123 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8 MILES EAST OF TRENTON...MOVING EAST AT 5 MPH. THE THUNDERSTORM WILL BE NEAR WINDSOR AROUND 1130 AM...ALLENTOWN... MONMOUTH JUNCTION AROUND 1145 AM...HIGHTSTOWN...DAYTON AROUND 1215 PM...TWIN RIVERS AND CLEARBROOK PARK AROUND 1230 PM. VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING FROM THIS STORM. FORECASTER:AMC
Special weather statement, Aug 12, 2:35 PM EDT, 1 hour 41 minutes before
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</html>Local storm report, Aug 12, 3:28 PM EDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
328 PM EDT WED AUG 12 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0210 PM FLASH FLOOD SOUTH BELMAR 40.17N 74.03W
08/12/2009 MONMOUTH NJ CO-OP OBSERVER
1.28 INCHES RAIN FROM STORM, WITH 1.07 INCHES IN 17
MINUTES. MINOR FLOODING REPORTED.
0201 PM LIGHTNING 2 NE CASSVILLE 40.12N 74.36W
08/12/2009 OCEAN NJ TRAINED SPOTTER
PERSON POSSIBLY STRUCK BY LIGHTNING ALONG BRIDGEWATER
COURT IN JACKSON TWP.
0201 PM LIGHTNING 2 NE CASSVILLE 40.12N 74.36W
08/12/2009 OCEAN NJ TRAINED SPOTTER
3 HOMES AFFECTED BY LIGHTNING STRIKES ALONG BRIDGEWATER
COURT IN JACKSON TWP. ONE HOME HAS MAJOR DAMAGE.
0145 PM FLASH FLOOD 2 ESE HAMILTON SQUARE 40.22N 74.64W
08/12/2009 MERCER NJ COUNTY OFFICIAL
TWO FEET OF WATER AGAINST 8 TO 10 HOUSES ALONG CHARLENE
COURT IN ROBBINSVILLE TWP.
0125 PM FLASH FLOOD 2 ESE HAMILTON SQUARE 40.22N 74.64W
08/12/2009 MERCER NJ LAW ENFORCEMENT
6 INCHES OF FLOWING WATER AT INTERSECTION OF ROUTE 130
AND MEADOWBROOK ROAD IN ROBBINSVILLE TWP.
1257 PM FLASH FLOOD 2 ESE HAMILTON SQUARE 40.22N 74.64W
08/12/2009 MERCER NJ TRAINED SPOTTER
MAJOR FLOODING IN ROBBINSVILLE TWP ALONG ROUTE 130. ALSO
REPORTS OF SMALL HAIL.
1150 AM FLASH FLOOD HAMILTON SQUARE 40.23N 74.68W
08/12/2009 MERCER NJ CO-OP OBSERVER
0.58 INCHES OF RAIN IN 20 MINUTES. LOTS OF LIGHTNING.
&&
KEKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:04 PM EDT | Areal Flood Advisory | PHI | Mercer | 60 min |
| Aug 12, 12:47 PM EDT | Flash Flood Warning | PHI | Mercer | 3 hr |
| Aug 12, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 22 min |
| Aug 12, 2:55 PM EDT | Areal Flood Advisory | PHI | Monmouth, Ocean | 50 min |
| Aug 12, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cumberland | 59 min |
| Aug 12, 3:17 PM EDT | Flash Flood Warning | PHI | Atlantic, Cumberland | 4 hr |
| Aug 12, 3:29 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester | 60 min |
| Aug 12, 3:32 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Ocean | 118 min |
| Aug 12, 4:01 PM EDT | Flash Flood Warning | PHI | Atlantic, Cape May | 3 hr |
| Aug 12, 4:16 PM EDT | Flash Flood Warning | PHI | Cumberland, Salem | 6 hr |
| Aug 12, 4:55 PM EDT | Flash Flood Warning | PHI | Salem | 3 hr |
| Aug 12, 5:13 PM EDT | Areal Flood Advisory | PHI | Cape May, Cumberland | 2 hr |
| Aug 12, 6:03 PM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| Aug 12, 5:18 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 2 hr |
| Aug 12, 6:52 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 3 hr |
| Aug 12, 4:39 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 12, 5:55 PM EDT | Flash Flood Warning | PHI | New Castle | 100 min |
Nearby
Areal 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.