Alert archive / Pennsylvania / Flash Flood Warnings in 2017

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

June 19, 20174 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 19, 2017, 3:24 PM EDT for 4 counties in 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: Jun 19, 2017, 3:24 PM EDT (19:24 UTC)
Expired: Jun 19, 2017, 6:30 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 19:25 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 12:00Z, 7.4 hours before the alert went out and 206 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: 1007 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

108 
WGUS51 KPHI 191924
FFWPHI
PAC025-077-089-095-192230-
/O.NEW.KPHI.FF.W.0003.170619T1924Z-170619T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
324 PM EDT MON JUN 19 2017

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Lehigh County in eastern Pennsylvania...
  Eastern Carbon County in northeastern Pennsylvania...
  Monroe County in northeastern Pennsylvania...
  Northampton County in eastern Pennsylvania...

* Until 630 PM EDT

* At 323 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two inches of rain has 
  been reported...and more is on the way.  Flash flooding is 
  expected in the heavier rain bands. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4115 7515 4114 7512 4061 7523 4042 7549
      4058 7573 4123 7554 4125 7513

$$

jjm

1 follow-up statement

574 
WGUS71 KPHI 192150
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
550 PM EDT MON JUN 19 2017

PAC025-077-089-095-192159-
/O.CAN.KPHI.FF.W.0003.000000T0000Z-170619T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
550 PM EDT MON JUN 19 2017

...THE FLASH FLOOD WARNING FOR LEHIGH...EASTERN CARBON...MONROE AND
NORTHAMPTON COUNTIES IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Any rainfall over the next couple of hours will be light to 
moderate. Please continue to heed any remaining road closures.

LAT...LON 4115 7515 4114 7512 4061 7523 4042 7549
      4058 7573 4123 7554 4125 7513

$$

MWG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 12:24 PM EDT	Special Weather Statement	PHI	Monroe	21 min
Jun 19, 12:44 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Jun 19, 12:46 PM EDT	Special Weather Statement	PHI	Berks	29 min
Jun 19, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jun 19, 1:25 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Jun 19, 1:29 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jun 19, 1:42 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jun 19, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	52 min
Jun 19, 2:20 PM EDT	Special Weather Statement	PHI	Northampton	40 min
Jun 19, 2:25 PM EDT	Special Weather Statement	PHI	Berks	50 min
Jun 19, 2:38 PM EDT	Special Weather Statement	PHI	Philadelphia	22 min
Jun 19, 2:43 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	47 min
Jun 19, 2:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery, Northampton	41 min
Jun 19, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	52 min
Jun 19, 2:57 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	48 min
Jun 19, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jun 19, 3:17 PM EDT	Flash Flood Warning	PHI	Monroe	3 hr
Jun 19, 3:25 PM EDT	Special Weather Statement	PHI	Chester	50 min
Jun 19, 3:35 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 19, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	25 min
Jun 19, 3:53 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	37 min
Jun 19, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	49 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	38 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	41 min
Jun 19, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	51 min

Nearby

Flash Flood Warnings in Pennsylvania, 2017 Every flash flood warning in 2017

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.