Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 30, NWS Philadelphia/Mount Holly

July 1, 20134 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 1, 2013, 7:52 AM EDT for 4 counties in 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 1, 2013, 7:52 AM EDT (11:52 UTC)
Expired: Jul 1, 2013, 11:45 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 93 km from the middle of the area, began a volume at 11:54 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 1, 7:55 AM EDT	FLASH FLOOD	East Norriton, PA	A WATER RESCUE IN EAST NORRITON ON A FLOODED ROADWAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 11.9 hours before the alert went out and 211 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: 358 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 465 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

614 
WGUS51 KPHI 011152
FFWPHI
PAC017-077-091-095-011545-
/O.NEW.KPHI.FF.W.0030.130701T1152Z-130701T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
752 AM EDT MON JUL 1 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN BUCKS COUNTY...
  SOUTHEASTERN LEHIGH COUNTY...
  MONTGOMERY COUNTY...
  EASTERN NORTHAMPTON COUNTY...

* UNTIL 1145 AM EDT...

* AT 733 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN OVER EASTERN NORTHAMPTON...MONTGOMERY...           
  SOUTHEASTERN LEHIGH AND WESTERN BUCKS COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EASTON.

SPOTTER REPORTS AND ESTIMATED RAINFALL FROM DOPPLER RADAR INDICATE 
THAT IN EXCESS OF TWO INCHES OF RAIN ARE FALLING PER HOUR. THESE 
TYPE OF RAIN RATES, ON TOP OF ALREADY WET SOILS, WILL LEAD TO RAPID  
FLOODING. MOVE TO HIGHER GROUND IF NECESSARY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DRIVING INTO FLOOD WATERS COULD COST YOU YOUR LIFE...OR AT THE VERY
LEAST...THOUSANDS OF DOLLARS OF VEHICLE DAMAGE. NEARLY HALF OF ALL
FLASH FLOOD FATALITIES ARE AUTO RELATED. TURN AROUND...DON'T DROWN.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4080 7511 4075 7520 4069 7520 4067 7518
      4058 7520 4056 7509 4042 7506 4041 7499
      4038 7497 4006 7535 4009 7546 4012 7546
      4012 7550 4016 7550 4015 7552 4020 7555
      4019 7557 4025 7564 4086 7529 4089 7525

$$

KRUZDLO

2 follow-up statements

502 
WGUS71 KPHI 011348
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
948 AM EDT MON JUL 1 2013

PAC017-077-091-095-011545-
/O.CON.KPHI.FF.W.0030.000000T0000Z-130701T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-
948 AM EDT MON JUL 1 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 AM EDT FOR
EASTERN NORTHAMPTON...MONTGOMERY...SOUTHEASTERN LEHIGH AND WESTERN
BUCKS COUNTIES...

AT 936 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED 
THAT OVER 4.00 INCHES OF RAIN HAD FALLEN THIS MORNING ACROSS 
PORTIONS OF THE WARNED AREA. A FEW SPOTTER REPORTS INDICATED THAT UP 
TO 2.50 INCHES OF THIS RAIN HAD FALLEN IN ABOUT THIRTY MINUTES.

EVEN THOUGH THE RAIN HAS MOVED OUT OF PORTIONS OF THE WARNED AREA, 
DUE TO THESE EXTRAORDINARY HIGH RAINFALL RATES, THE WARNING WILL 
REMAIN IN EFFECT UNTIL 1145 AM.  

LAT...LON 4080 7511 4075 7520 4069 7520 4067 7518
      4058 7520 4056 7509 4042 7506 4041 7499
      4038 7497 4006 7535 4009 7546 4012 7546
      4012 7550 4016 7550 4015 7552 4020 7555
      4019 7557 4025 7564 4086 7529 4089 7525

$$

KRUZDLO

862 
WGUS71 KPHI 011537
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1137 AM EDT MON JUL 1 2013

PAC017-077-091-095-011546-
/O.EXP.KPHI.FF.W.0030.000000T0000Z-130701T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-
1137 AM EDT MON JUL 1 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1145 AM EDT FOR EASTERN
NORTHAMPTON...MONTGOMERY...SOUTHEASTERN LEHIGH AND WESTERN BUCKS
COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND NO LONGER
POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH FLOOD
WARNING WILL BE ALLOWED TO EXPIRE.

MORE RAIN IS EXPECTED THIS AFTERNOON. ADDITIONAL WARNINGS ARE 
POSSIBLE. REMAIN VIGILANT.

REMEMBER, DRIVING INTO FLOOD WATERS COULD PUT YOUR LIFE AT RISK AND 
COST YOU THOUSANDS OF DOLLARS IN VEHICLE REPAIRS. FLOOD WATERS MAY 
BE DEEPER THAN YOU THINK. TURN AROUND AND FIND AN ALTERNATE ROUTE.

LAT...LON 4080 7511 4075 7520 4069 7520 4067 7518
      4058 7520 4056 7509 4042 7506 4041 7499
      4038 7497 4006 7535 4009 7546 4012 7546
      4012 7550 4016 7550 4015 7552 4020 7555
      4019 7557 4025 7564 4086 7529 4089 7525

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 2:26 AM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	3 hr
Jul 1, 3:33 AM EDT	Special Weather Statement	PHI	Carbon	42 min
Jul 1, 3:50 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	3 hr
Jul 1, 5:37 AM EDT	Flash Flood Warning	PHI	Monroe, Northampton	6 hr
Jul 1, 5:55 AM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Jul 1, 6:49 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 1, 6:58 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	4 hr
Jul 1, 8:38 AM EDT	Areal Flood Warning	PHI	Chester	6 hr
Jul 1, 9:35 AM EDT	Areal Flood Warning	PHI	Bucks	6 hr
Jul 1, 11:57 AM EDT	River Flood Warning	PHI	Chester	2 hr
Jul 1, 1:56 PM EDT	Areal Flood Warning	PHI	Montgomery	6 hr
Jul 1, 2:14 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2013 Every flash flood warning in 2013

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.