Alert archive / Pennsylvania / Flash Flood Warnings in 2019
Flash Flood Warning 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at May 19, 2019, 9:29 PM EDT for 5 counties in Pennsylvania. It was in force for 4 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
- May 19, 2019, 9:29 PM EDT (01:29 UTC)
- Expired
- May 20, 2019, 1:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 01:29 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
Brookhaven, NY (KOKX), launched 00:00Z, 1.5 hours before the alert went out and 228 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
- 61 J/kg
- Mixed-layer CIN
- -284 J/kg
- Mixed-layer LCL
- 581 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
720 WGUS51 KPHI 200129 FFWPHI PAC011-017-077-091-095-200530- /O.NEW.KPHI.FF.W.0002.190520T0129Z-190520T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Mount Holly NJ 929 PM EDT Sun May 19 2019 The National Weather Service in Mount Holly NJ has issued a * Flash Flood Warning for... East central Berks County in eastern Pennsylvania... Northwestern Montgomery County in southeastern Pennsylvania... Southeastern Lehigh County in eastern Pennsylvania... Northwestern Bucks County in southeastern Pennsylvania... South central Northampton County in eastern Pennsylvania... * Until 130 AM EDT. * At 928 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. One to two inches of rain have already fallen in a short amount of time with additional rainfall moving into the area. Flash flooding is expected to begin shortly in the areas of heaviest rain. * Some locations that could experience flooding include... Allentown, Bethlehem, Emmaus, Quakertown, Perkasie, Hellertown, Kutztown, East Greenville, Dublin, Topton, Bally, Bechtelsville, Pleasant Valley, Zionsville, Ancient Oaks, Lehigh University, Geryville, Springtown, Gilbertsville and Fountain Hill. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low lying spots. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. && LAT...LON 4033 7564 4053 7578 4069 7531 4038 7516 $$ Robertson
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 8:14 PM EDT | Special Weather Statement | PHI | Lehigh | 46 min |
| May 19, 8:35 PM EDT | Tornado Warning | PHI | Berks | 25 min |
| May 19, 8:37 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery | 38 min |
| May 19, 8:43 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| May 19, 9:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 51 min |
| May 19, 9:46 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Northampton | 44 min |
| May 19, 10:27 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 48 min |
| May 19, 10:34 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 3 hr |
| May 19, 10:48 PM EDT | Flash Flood Warning | PHI | Berks | 117 min |
| May 19, 11:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 60 min |
| May 19, 11:15 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 3 hr |
| May 19, 11:41 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 53 min |
| May 19, 11:54 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 39 min |
| May 20, 12:57 AM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| May 20, 1:21 AM EDT | Areal Flood Advisory | PHI | Berks, Montgomery | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2019Every flash flood warning in 2019
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.