Alert archive / Pennsylvania / Flood Watches in 2011
Flood Watch 15, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Dec 26, 2011, 3:13 PM EST for Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware. It took effect at Dec 27, 2011, 3:00 PM EST. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Dec 26, 2011, 3:13 PM EST (20:13 UTC)
- In effect from
- Dec 27, 2011, 3:00 PM EST
- Expired
- Dec 27, 2011, 8:51 PM EST
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 20:13 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 12:00Z, 8.2 hours before the alert went out and 199 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
- 3 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1291 m above ground
- 0-6 km bulk shear
- 84 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
172 WGUS61 KPHI 262013 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 313 PM EST MON DEC 26 2011 DEZ001-PAZ067>071-271000- /O.NEW.KPHI.FA.A.0015.111227T2000Z-111228T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 313 PM EST MON DEC 26 2011 ...FLOOD WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN SOUTHEAST PENNSYLVANIA...BUCKS... CHESTER...DELAWARE...MONTGOMERY AND PHILADELPHIA. * FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING * HEAVIER RAIN IS EXPECTED TO FALL TUESDAY AFTERNOON INTO EVENING IN THE WATCH AREA. EVENT RAINFALL TOTALS OF 1.0 TO 1.5 INCHES WOULD BE ENOUGH TO START FLOODING OF THE MORE SUSCEPTIBLE CREEKS AND SMALL RIVERS IN THE WATCH AREA. * POOR DRAINAGE ROADWAY FLOODING SHOULD BE EXPECTED. MAINLY MINOR CREEK AND SMALLER RIVER FLOODING IS POSSIBLE. THIS MAY CLOSE SOME ROADWAYS IN THE WATCH AREA. THE HEAVIER RAIN SHOULD HAVE AN IMPACT ON THE EVENING COMMUTE EVEN IF ITS LIGHTER THAN AVERAGE BECAUSE OF THE HOLIDAY WEEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ TFG
3 follow-up statements
722 WGUS61 KPHI 270838 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 338 AM EST TUE DEC 27 2011 DEZ001-PAZ067>071-272200- /O.CON.KPHI.FA.A.0015.111227T2000Z-111228T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 338 AM EST TUE DEC 27 2011 ...FLOOD WATCH REMAINS IN EFFECT FROM 3 PM EST THIS AFTERNOON THROUGH THIS EVENING... THE FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN DELAWARE AND SOUTHEAST PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER... DELAWARE...MONTGOMERY AND PHILADELPHIA. * FROM 3 PM EST THIS AFTERNOON THROUGH THIS EVENING * HEAVIER RAIN IS EXPECTED TO FALL THIS AFTERNOON INTO THIS EVENING IN THE WATCH AREA. EVENT RAINFALL TOTALS OF 1.0 TO 1.5 INCHES WOULD BE ENOUGH TO START FLOODING OF THE MORE SUSCEPTIBLE CREEKS AND SMALL RIVERS IN THE WATCH AREA. * POOR DRAINAGE ROADWAY FLOODING SHOULD BE EXPECTED. MAINLY MINOR CREEK AND SMALLER RIVER FLOODING IS POSSIBLE. THIS MAY CLOSE SOME ROADWAYS IN THE WATCH AREA. THE HEAVIER RAIN SHOULD HAVE AN IMPACT ON THE EVENING COMMUTE EVEN IF ITS LIGHTER THAN AVERAGE BECAUSE OF THE HOLIDAY WEEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$
238 WGUS61 KPHI 271926 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 226 PM EST TUE DEC 27 2011 DEZ001-PAZ067>071-280500- /O.CON.KPHI.FA.A.0015.111227T2000Z-111228T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 226 PM EST TUE DEC 27 2011 ...FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EST TONIGHT... THE FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN DELAWARE AND SOUTHEAST PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER... DELAWARE...MONTGOMERY AND PHILADELPHIA. * UNTIL MIDNIGHT EST TONIGHT * HEAVIER RAIN IS EXPECTED TO FALL THROUGH THE EVENING IN THE WATCH AREA. EVENT RAINFALL TOTALS OF 1.0 TO 1.5 INCHES WOULD BE ENOUGH TO START FLOODING OF THE MORE SUSCEPTIBLE CREEKS AND SMALL RIVERS IN THE WATCH AREA. * POOR DRAINAGE ROADWAY FLOODING SHOULD BE EXPECTED. MAINLY MINOR CREEK AND SMALLER RIVER FLOODING IS POSSIBLE. THIS MAY CLOSE SOME ROADWAYS IN THE WATCH AREA. THE HEAVIER RAIN SHOULD HAVE AN IMPACT ON THE EVENING COMMUTE EVEN THOUGH IT IS LIGHTER THAN AVERAGE BECAUSE OF THE HOLIDAY WEEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$
093 WGUS61 KPHI 280151 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 851 PM EST TUE DEC 27 2011 DEZ001-PAZ067>071-280300- /O.CAN.KPHI.FA.A.0015.000000T0000Z-111228T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 851 PM EST TUE DEC 27 2011 ...FLOOD WATCH IS CANCELLED... NO ADDITIONAL FLOOD WARNINGS ARE ANTICIPATED AND THE HEAVY RAIN IS OVER. THE PERKIOMEN CREEK IN EAST GREENVILLE IN MONTGOMERY COUNTY AND THE CHRISTINA RIVER AT COOCHS BRIDGE IN NEW CASTLE COUNTY ARE EXPECTED TO CREST CLOSE TO FLOOD STAGE LATER THIS EVENING. $$
Nearby
Flood Watches in Pennsylvania, 2011Flood Watches in Delaware, 2011Every flood watch 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.