Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

May 19, 2019Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at May 19, 2019, 10:48 PM EDT for Berks County, Pennsylvania. It was in force for 117 min. 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, 10:48 PM EDT (02:48 UTC)
Expired: May 20, 2019, 12:45 AM EDT
In force: 117 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 161 km from the middle of the area, began a volume at 02:50 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, 2.8 hours before the alert went out and 208 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 953 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1793 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

736 
WGUS51 KPHI 200248
FFWPHI
PAC011-200445-
/O.NEW.KPHI.FF.W.0003.190520T0248Z-190520T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1048 PM EDT Sun May 19 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northwestern Berks County in eastern Pennsylvania...

* Until 1245 AM EDT.

* At 1047 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the northern portions of the county, in the 
  vicinity of the I-78 corridor. Flash flooding is expected in the 
  areas of heaviest rain. 

* Some locations that could experience flooding include...
  Hamburg, Shoemakersville, Bernville, Strausstown, Lenhartsville and
  Centerport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4063 7600 4068 7590 4058 7573 4038 7625
      4049 7643

$$

JJM

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, 9:29 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
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, 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, 2019 Every 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.