Alert archive / Pennsylvania / Areal Flood Advisories in 2008

Areal Flood Advisory 24, NWS Philadelphia/Mount Holly

August 14, 2008Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 14, 2008, 3:50 PM EDT for Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Aug 14, 2008, 3:50 PM EDT (19:50 UTC)
Expired: Aug 14, 2008, 6:45 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 19:51 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, 7.8 hours before the alert went out and 163 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: 374 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 966 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 14, 1:20 PM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Aug 14, 1:20 PM EDT, 2 hours 30 minutes before

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Hazardous weather outlook, Aug 14, 3:16 PM EDT, 34 minutes before

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In the hours before

Special weather statement, Aug 14, 2:48 PM EDT, 1 hour 2 minutes before

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Special weather statement, Aug 14, 3:00 PM EDT, 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
300 PM EDT THU AUG 14 2008

PAZ062-142000-
NORTHAMPTON PA-
300 PM EDT THU AUG 14 2008

...A STRONG THUNDERSTORM WILL AFFECT NORTHAMPTON COUNTY...

AT 258 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES NORTHWEST OF ALLENTOWN...MOVING
NORTHEAST AT 23 MPH. THE THUNDERSTORM WILL BE NEAR BEERSVILLE AROUND
310 PM...CHAPMAN...BATH...STEUBEN AROUND 320 PM...NAZARETH...PALMER
HEIGHTS AROUND 330 PM...EASTLAWN GARDENS...STOCKERTOWN...TATAMY
AROUND 335 PM AND BELFAST AROUND 340 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.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

EXPECT FREQUENT CLOUD TO GROUND LIGHTNING FROM THIS STORM. DO NOT
SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES. THIS STORM HAS THE POTENTIAL TO
STRENGTHEN AGAIN AND POSSIBLY BECOME SEVERE.

FORECASTER: GORSE

Special weather statement, Aug 14, 3:21 PM EDT, 29 minutes before

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Special weather statement, Aug 14, 3:36 PM EDT, 14 minutes before

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Special weather statement, Aug 14, 3:43 PM EDT, 7 minutes before

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Special weather statement, Aug 14, 3:49 PM EDT, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:45 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Aug 14, 4:12 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Aug 13, 9:26 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	64 min
Aug 13, 10:24 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	36 min
Aug 14, 2:37 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	38 min
Aug 14, 2:43 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	34 min
Aug 14, 4:29 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Aug 14, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	57 min
Aug 14, 6:55 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	49 min

Nearby

Areal Flood Advisories in Pennsylvania, 2008 Areal Flood Advisories in New Jersey, 2008 Every areal flood advisory in 2008

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.