Alert archive / Pennsylvania / Flash Flood Watches in 2021
Flash Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Jun 3, 2021, 9:37 AM EDT for 4 counties in New Jersey; 5 counties in Pennsylvania; New Castle County, Delaware. It took effect at Jun 3, 2021, 3:00 PM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jun 3, 2021, 9:37 AM EDT (13:37 UTC)
- In effect from
- Jun 3, 2021, 3:00 PM EDT
- Expired
- Jun 3, 2021, 10:00 PM EDT
- In force
- 7 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 13:40 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, 1.6 hours before the alert went out and 213 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
- 73 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 511 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
084 WGUS61 KPHI 031337 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 937 AM EDT Thu Jun 3 2021 DEZ001-NJZ016>019-PAZ070-071-101>106-040145- /O.NEW.KPHI.FF.A.0001.210603T1900Z-210604T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Salem-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Lansdale, Chalfont, Mount Holly, Morrisville, Cherry Hill, Moorestown, West Chester, Wilmington, Philadelphia, Doylestown, Collegeville, Pottstown, Camden, Media, Oxford, Pennsville, Honey Brook, Kennett Square, Perkasie, and Norristown 937 AM EDT Thu Jun 3 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 3 PM EDT THIS AFTERNOON THROUGH THIS EVENING... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of northern Delaware...southern New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In southern New Jersey...Camden, Gloucester, Northwestern Burlington, and Salem. In southeast Pennsylvania...Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * From 3 PM EDT this afternoon through this evening. * Showers and thunderstorms are expected to develop by mid afternoon over western Maryland into central Pennsylvania and move eastward into the region by late this afternoon into this evening. These storms will be capable of producing heavy rainfall over a short period of time which may result in flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Fitzsimmons
2 follow-up statements
618 WGUS61 KPHI 031922 FFAPHI Flood Watch National Weather Service Mount Holly NJ 322 PM EDT Thu Jun 3 2021 DEZ001-NJZ016>019-PAZ070-071-101>106-040200- /O.CON.KPHI.FF.A.0001.000000T0000Z-210604T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Salem-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Lansdale, Chalfont, Mount Holly, Morrisville, Cherry Hill, Moorestown, West Chester, Wilmington, Philadelphia, Doylestown, Collegeville, Pottstown, Camden, Media, Oxford, Pennsville, Honey Brook, Kennett Square, Perkasie, and Norristown 322 PM EDT Thu Jun 3 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * Portions of northern Delaware...southern New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In southern New Jersey...Camden, Gloucester, Northwestern Burlington, and Salem. In southeast Pennsylvania...Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 10 PM EDT this evening. * Developing showers and thunderstorms will continue to increase in coverage and move eastward into the region by late this afternoon into this evening. These storms will be capable of producing heavy rainfall over a short period of time which may result in flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Fitzsimmons
648 WGUS61 KPHI 040149 FFAPHI Flood Watch National Weather Service Mount Holly NJ 949 PM EDT Thu Jun 3 2021 DEZ001-NJZ016>019-PAZ070-071-101>106-040300- /O.EXP.KPHI.FF.A.0001.000000T0000Z-210604T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Salem-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Lansdale, Chalfont, Mount Holly, Morrisville, Cherry Hill, Moorestown, West Chester, Wilmington, Philadelphia, Doylestown, Collegeville, Pottstown, Camden, Media, Oxford, Pennsville, Honey Brook, Kennett Square, Perkasie, and Norristown 949 PM EDT Thu Jun 3 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT 10 PM EDT THIS EVENING... The Flash Flood Watch for portions of northern Delaware...southern New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In southern New Jersey... Camden, Gloucester, Northwestern Burlington, and Salem. In southeast Pennsylvania...Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery will expire at 10 PM EDT this evening. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ SFJ
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 5:55 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jun 3, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Salem | 42 min |
| Jun 3, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 38 min |
| Jun 3, 7:09 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 2 hr |
| Jun 3, 7:13 PM EDT | Areal Flood Advisory | PHI | Burlington, Hunterdon, Mercer, Middlesex, Somerset | 3 hr |
| Jun 3, 7:52 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 38 min |
| Jun 3, 3:02 PM EDT | Special Weather Statement | PHI | Berks | 43 min |
| Jun 3, 3:54 PM EDT | Special Weather Statement | PHI | Berks | 36 min |
| Jun 3, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 27 min |
| Jun 3, 5:20 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 3, 5:59 PM EDT | Flash Flood Warning | PHI | Berks, Chester | 108 min |
| Jun 3, 6:19 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 115 min |
| Jun 3, 5:33 PM EDT | Special Weather Statement | PHI | Sussex | 42 min |
Nearby
Flash Flood Watches in Pennsylvania, 2021Flash Flood Watches in New Jersey, 2021Flash Flood Watches in Delaware, 2021Every flash flood watch in 2021
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.