Alert archive / Pennsylvania / Flash Flood Warnings in 2018
Flash Flood Warning 38, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 22, 2018, 8:54 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 22, 2018, 8:54 PM EDT (00:54 UTC)
- Expired
- Jul 23, 2018, 1:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Chester County, PA
The radar
The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 00:57 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 22, 10:30 PM EDT | HEAVY RAIN 2.76 | Warwick, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.9 hours before the alert went out and 209 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
- 1533 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 664 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.5
The text
As transmitted.
811
WGUS51 KPHI 230054
FFWPHI
PAC011-029-230500-
/O.NEW.KPHI.FF.W.0038.180723T0054Z-180723T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
854 PM EDT SUN JUL 22 2018
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Berks County in eastern Pennsylvania...
North central Chester County in southeastern Pennsylvania...
* Until 100 AM EDT.
* At 852 PM EDT, Doppler radar indicated an area of showers and
thunderstorms producing very heavy rain moving north across the
warned area. A quick 1 to 2 inches of rain will fall, which is on
top of the earlier heavy rain. Flash flooding is expected to begin
shortly in the areas of heaviest rain.
* Some locations that could experience flooding include...
Reading, Wyomissing, Birdsboro, Kutztown, Hamburg, Fleetwood,
Sinking Spring, Laureldale, Wernersville, Topton, Leesport,
Shoemakersville, Elverson, Bernville, Lyons, Lenhartsville, New
Morgan, Spring Ridge, Fairview Hgts and Shillington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 4058 7605 4057 7602 4063 7600 4068 7589
4052 7565 4013 7573 4014 7588 4028 7609
4056 7612
$$
Gorse2 follow-up statements
589
WGUS71 KPHI 230135
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
935 PM EDT SUN JUL 22 2018
PAC011-029-230500-
/O.CON.KPHI.FF.W.0038.000000T0000Z-180723T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Chester PA-
935 PM EDT SUN JUL 22 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
BERKS AND NORTH CENTRAL CHESTER COUNTIES...
At 934 PM EDT, Doppler radar indicated showers and thunderstorms
producing very heavy rain continues to move cross the warned area. A
quick 1 to 2 inches of rain can fall, resulting in flash flooding.
Some locations that could experience flooding include...
Reading, Wyomissing, Birdsboro, Kutztown, Hamburg, Fleetwood, Sinking
Spring, Laureldale, Wernersville, Topton, Leesport, Shoemakersville,
Elverson, Bernville, Lyons, Lenhartsville, New Morgan, Spring Ridge,
Fairview Hgts and Shillington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4058 7605 4057 7602 4063 7600 4068 7589
4052 7565 4013 7573 4014 7588 4028 7609
4056 7612
$$
Gorse489
WGUS71 KPHI 230454
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1254 AM EDT MON JUL 23 2018
PAC011-029-230502-
/O.EXP.KPHI.FF.W.0038.000000T0000Z-180723T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Chester PA-
1254 AM EDT MON JUL 23 2018
...THE FLASH FLOOD WARNING FOR BERKS AND NORTH CENTRAL CHESTER
COUNTIES WILL EXPIRE AT 100 AM EDT...
The heavy rains has ended. There will still be scattered showers
overnight. Flooding is no longer expected to pose a threat. Please
continue to heed any remaining road closures.
LAT...LON 4058 7605 4057 7602 4063 7600 4068 7589
4052 7565 4013 7573 4014 7588 4028 7609
4056 7612
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 8:18 PM EDT | Areal Flood Warning | PHI | Chester | 117 min |
| Jul 22, 8:43 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 22, 9:40 PM EDT | Flash Flood Warning | PHI | Lehigh | 3 hr |
| Jul 22, 10:21 PM EDT | Special Weather Statement | PHI | Monroe | 54 min |
| Jul 22, 11:18 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe, Northampton | 3 hr |
| Jul 23, 12:19 AM EDT | River Flood Warning | PHI | Chester | 5 hr |
| Jul 23, 3:45 AM EDT | Flash Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 68 hr |
| Jul 23, 7:00 AM EDT | River Flood Warning | PHI | Chester, Delaware | 9 hr |
| Jul 23, 12:58 PM EDT | Special Weather Statement | PHI | Chester | 32 min |
| Jul 23, 1:01 PM EDT | Areal Flood Advisory | PHI | Chester | 34 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2018Every flash flood warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.