Alert archive / Pennsylvania / Areal Flood Advisories in 2008
Areal Flood Advisory 7, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 23, 2008, 4:23 AM EDT for Bucks County, Chester County, Montgomery County, Pennsylvania. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 23, 2008, 4:23 AM EDT (08:23 UTC)
- Expired
- Jul 23, 2008, 7:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 88 km from the middle of the area, began a volume at 08:24 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 8.4 hours before the alert went out and 218 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
- 934 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1560 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.6
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 Jul 23, 3:50 AM EDT, 33 minutes earlier.
Area forecast discussion, Jul 23, 3:50 AM EDT, 33 minutes before
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</html>Hazardous weather outlook, Jul 22, 2:11 PM EDT, 14 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 211 PM EDT TUE JUL 22 2008 DEZ002-003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-016-020>023- 027-PAZ054-055-060>062-231815- KENT-INLAND SUSSEX-CECIL-KENT MD-QUEEN ANNES-TALBOT-CAROLINE-SUSSEX- WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-SALEM- OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-SOUTHEASTERN BURLINGTON-CARBON- MONROE-BERKS-LEHIGH-NORTHAMPTON- 211 PM EDT TUE JUL 22 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY...NORTHERN NEW JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL PENNSYLVANIA AND NORTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED THUNDERSTORMS COULD BECOME SEVERE LATE TODAY OR TONIGHT AND THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY VERY HEAVY RAINFALL IS POSSIBLE WEDNESDAY AND WEDNESDAY NIGHT TIME FRAME. RAINFALL RATES IN EXCESS OF 2 INCHES AN HOUR ARE POSSIBLE. ALSO, THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. DEZ001-NJZ015-017>019-PAZ067>071-231815- NEW CASTLE-MERCER-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-CHESTER- MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- 211 PM EDT TUE JUL 22 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE...CENTRAL NEW JERSEY...SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT TEMPERATURES WILL BE HOT TODAY WITH HIGHS IN THE LOWER AND MIDDLE 90S. THE HEAT INDEX IS EXPECTED TO PEAK AROUND 97 DEGREES. GIVEN THE LENGTH OF THE PERIOD OF HEAT, IT STILL IS WISE TO BE CAREFUL AND TO TAKE PRECAUTIONS AGAINST THE HEAT, ESPECIALLY IN THE HIGHLY URBANIZED AREAS OF THE DELAWARE VALLEY. REMEMBER TO PAY PARTICULAR ATTENTION TO THE ELDERLY, THE VERY YOUNG, THE INFIRM, AND ANIMALS THAT DEPEND UPON US. ISOLATED THUNDERSTORMS COULD BECOME SEVERE LATE TODAY OR TONIGHT AND THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY VERY HEAVY RAINFALL IS POSSIBLE WEDNESDAY AND WEDNESDAY NIGHT TIME FRAME. RAINFALL RATES IN EXCESS OF 2 INCHES AN HOUR ARE POSSIBLE. ALSO, THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. DEZ004-NJZ014-024-025-231815- DELAWARE BEACHES-EASTERN MONMOUTH-ATLANTIC COASTAL CAPE MAY- COASTAL ATLANTIC- 211 PM EDT TUE JUL 22 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN DELAWARE...CENTRAL NEW JERSEY AND SOUTHERN NEW JERSEY. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED THUNDERSTORMS COULD BECOME SEVERE LATE TODAY OR TONIGHT AND THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS. THERE WILL BE A MODERATE RISK FOR RIP CURRENTS TODAY AND TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY VERY HEAVY RAINFALL IS POSSIBLE WEDNESDAY AND WEDNESDAY NIGHT TIME FRAME. RAINFALL RATES IN EXCESS OF 2 INCHES AN HOUR ARE POSSIBLE. ALSO, THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. ANZ430-431-450>455-NJZ026-231815- 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- COASTAL OCEAN- 211 PM EDT TUE JUL 22 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS...DELAWARE BAY WATERS AND SOUTHERN NEW JERSEY. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED THUNDERSTORMS COULD BECOME SEVERE LATE TODAY OR TONIGHT AND THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE STORM PREDICTION CENTER HAS PLACED THE AREA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED.
In the hours before
Special weather statement, Jul 22, 11:14 PM EDT, 5 hours 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1114 PM EDT TUE JUL 22 2008 MDZ008-012-230445- CECIL MD-KENT MD- 1114 PM EDT TUE JUL 22 2008 ...A STRONG THUNDERSTORM WILL AFFECT CECIL AND KENT COUNTIES IN MARYLAND... AT 1106 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 28 MILES NORTHWEST OF CENTERVILLE...MOVING NORTHEAST AT 28 MPH. THE THUNDERSTORM WILL BE NEAR LANGFORD AROUND 1130 PM...NEWTOWN...CHESTERTOWN AROUND 1145 PM...BETTERTON AROUND MIDNIGHT...WOODLAWN...PERRYVILLE AROUND 1215 AM...LOMBARD AND ZION AROUND 1230 AM. WIND GUSTS TO 40 MPH AS WELL AS TORRENTIAL DOWNPOURS ARE POSSIBLE WITH THIS STORM. ALSO, A GUST FRONT MAY COME OUT FROM THE STORM AND AFFECT AREAS IN KENT AND CECIL COUNTIES MARYLAND THAT ARE NOT DIRECTLY IN THE PATCH OF THE 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, Jul 22, 11:46 PM EDT, 4 hours 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1146 PM EDT TUE JUL 22 2008 PAZ067-230515- CHESTER PA- 1146 PM EDT TUE JUL 22 2008 ...STRONG THUNDERSTORMS WILL AFFECT CHESTER COUNTY... AT 1142 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER SOUTHERN LANCASTER COUNTY...MOVING NORTHEAST AT 25 MPH. THE THUNDERSTORMS WILL BE NEAR OXFORD...GLEN ROY AROUND MIDNIGHT...AVONDALE AROUND 1215 AM...SOUTH COATESVILLE AROUND 1230 AM...AND DOWNINGTOWN AROUND 1245 AM. VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. WIND GUSTS TO 40 MPH ARE POSSIBLE. 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, Jul 23, 12:08 AM EDT, 4 hours 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1208 AM EDT WED JUL 23 2008 DEZ001-MDZ008-012-NJZ016>019-PAZ068-070-071-230545- CAMDEN NJ-CECIL MD-DELAWARE PA-GLOUCESTER NJ-KENT MD-MONTGOMERY PA- NEW CASTLE DE-NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-SALEM NJ- 1208 AM EDT WED JUL 23 2008 ...STRONG THUNDERSTORMS WILL AFFECT BURLINGTON...CAMDEN...CECIL... DELAWARE...GLOUCESTER...KENT...MONTGOMERY...NEW CASTLE... PHILADELPHIA AND SALEM COUNTIES... AT MIDNIGHT EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER NORTHEAST MARYLAND...MOVING NORTHEAST AROUND 25 MPH. THE THUNDERSTORMS WILL HEAD ACROSS NORTHERN DELAWARE INTO SOUTHWEST NEW JERSEY AND SOUTHEAST PENNSYLVANIA THROUGH 145 AM. VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND COULD CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. WIND GUSTS TO 40 MPH ARE ALSO POSSIBLE. EXPECT FREQUENT LIGHTNING FROM THE STORMS. DO NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES. RNS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 3:02 AM EDT | Special Marine Warning | PHI | 58 min | |
| Jul 23, 3:51 AM EDT | Flash Flood Watch | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 25 hr |
| Jul 23, 2:44 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 46 min |
| Jul 23, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 35 min |
| Jul 23, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 47 min |
| Jul 23, 3:26 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 64 min |
| Jul 23, 3:30 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 60 min |
| Jul 23, 4:03 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 57 min |
| Jul 23, 4:09 PM EDT | Tornado Warning | PHI | Middlesex, Somerset | 36 min |
| Jul 23, 4:51 PM EDT | Areal Flood Warning | PHI | Middlesex, Somerset | 105 min |
| Jul 23, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 57 min |
| Jul 23, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Somerset | 62 min |
| Jul 23, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 60 min |
| Jul 23, 7:10 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 35 min |
| Jul 23, 7:48 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 57 min |
| Jul 23, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 62 min |
| Jul 23, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 38 min |
| Jul 23, 4:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 58 min |
| Jul 23, 12:30 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 45 min |
| Jul 23, 1:11 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 64 min |
| Jul 23, 6:11 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 64 min |
| Jul 23, 7:14 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 61 min |
Nearby
Areal Flood Advisories in Pennsylvania, 2008Every 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.