Alert archive / Pennsylvania / Areal Flood Warnings in 2021
Areal Flood Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Feb 28, 2021, 7:38 PM EST for Chester County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2021, 7:38 PM EST (00:38 UTC)
- Expired
- Feb 28, 2021, 11:01 PM EST
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 00:38 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, 0.6 hours before the alert went out and 186 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 547 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 309 m²/s²
- 0-3 km storm-relative helicity
- 419 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
994 WGUS41 KPHI 010038 FLWPHI BULLETIN - EAS ACTIVATION REQUESTED Flood Warning National Weather Service Mount Holly NJ 738 PM EST Sun Feb 28 2021 PAC029-010445- /O.NEW.KPHI.FA.W.0001.210301T0038Z-210301T0445Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Chester PA- 738 PM EST Sun Feb 28 2021 The National Weather Service in Mount Holly has issued a * Flood Warning for... Central Chester County in southeastern Pennsylvania... * Until 1145 PM EST. * At 738 PM EST, Doppler radar indicated heavy rain. Flooding is ongoing or expected to begin shortly in the warned area. Between 1 and 1.5 inches of rain have fallen. Some locations that may experience flooding include... Marshallton. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Warning means that flooding is imminent or occurring. All interested parties should take necessary precautions immediately. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3997 7570 4000 7568 3993 7562 3992 7566 $$ Davis
1 follow-up statement
262 WGUS81 KPHI 010401 RRA FLSPHI Flood Statement National Weather Service Mount Holly NJ 1101 PM EST Sun Feb 28 2021 PAC029-010411- /O.CAN.KPHI.FA.W.0001.000000T0000Z-210301T0445Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Chester PA- 1101 PM EST Sun Feb 28 2021 ...FLOOD WARNING IS CANCELLED FOR CENTRAL CHESTER COUNTY... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3997 7570 4000 7568 3993 7562 3992 7566 $$ Deal
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 7:43 PM EST | River Flood Warning | PHI | Chester | 3 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2021Every areal flood warning 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.