Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 1, NWS Philadelphia/Mount Holly

April 28, 2011Carbon County, Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Apr 28, 2011, 7:06 AM EDT for Carbon County, Monroe County, Pennsylvania. It was in force for 6 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: Apr 28, 2011, 7:06 AM EDT (11:06 UTC)
Expired: Apr 28, 2011, 1:00 PM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Carbon County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 136 km from the middle of the area, began a volume at 11:07 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, 11.1 hours before the alert went out and 217 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: 172 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 447 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

365 
WGUS51 KPHI 281106
FFWPHI
PAC025-089-281500-
/O.NEW.KPHI.FF.W.0001.110428T1106Z-110428T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
706 AM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...

* UNTIL 1100 AM EDT

* AT 700 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THAT UP TO TWO INCHES OF RAIN HAS FALLEN IN PARTS OF BOTH CARBON   
  AND MONROE COUNTIES DURING THE OVERNIGHT HOURS. WITH MORE HEAVY    
  RAIN ON THE WAY FOR THE NEXT ONE TO TWO HOURS, FLASH FLOODING ON   
  SMALL FEEDER STREAMS AND LOW LYING AREAS WILL OCCUR. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  TOBYHANNA...SKYTOP...SCOTRUN...POCONO RACEWAY...PARADISE VALLEY...
  LONG POND...LAKE HARMONY...HERNYVILLE...GOULDSBORO STATE PARK...
  ECHO LAKE...CANADENSIS...BLAKESLEE...ANALOMINK...ALPINE MOUNTAIN...
  MOUNTAINHOME...WHITE HAVEN AND POCONO PINES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 

&&

LAT...LON 4116 7516 4115 7509 4109 7503 4110 7498
      4107 7498 4100 7511 4096 7514 4086 7531
      4078 7570 4074 7576 4081 7590 4090 7600
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514

$$

JJM

3 follow-up statements

833 
WGUS71 KPHI 281307
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
907 AM EDT THU APR 28 2011

PAC025-089-281500-
/O.CON.KPHI.FF.W.0001.000000T0000Z-110428T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON PA-MONROE PA-
907 AM EDT THU APR 28 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT FOR
MONROE AND CARBON COUNTIES...

AT 900 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
AREAS OF LIGHT TO MODERATE RAIN OVER PORTIONS OF CARBON AND MONROE 
COUNTIES. HOWEVER...POCKETS OF HEAVIER RAIN ARE EXPECTED TO DEVELOP 
OVER OR NEAR THESE TWO COUNTIES WITHIN THE HOUR OR SO. THEREFORE...THE 
FLASH FLOOD WARNING ISSUED EARLIER FOR BOTH COUNTIES WILL CONTINUE 
TO 11 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND WESTERN
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4116 7516 4115 7509 4109 7503 4110 7498
      4107 7498 4100 7511 4096 7514 4086 7531
      4078 7570 4074 7576 4081 7590 4090 7600
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514

$$

JJM

258 
WGUS51 KPHI 281453
FFWPHI
PAC025-089-281700-
/O.EXT.KPHI.FF.W.0001.000000T0000Z-110428T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1053 AM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...

* UNTIL 100 PM EDT

* AT 1046 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED THAT HEAVY RAIN HAS MOVED OUT OF THE WARNED AREA.        
  HOWEVER...FLOODING WAS STILL BEING REPORTED FROM EARLIER RAIN.   
  THEREFORE...THE FLASH FLOOD WARNING HAS BEEN EXTENDED FOR ANOTHER  
  TWO HOURS UNTIL FLOOD WATERS RECEDE. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 4116 7516 4115 7509 4109 7503 4110 7498
      4107 7498 4100 7511 4096 7514 4086 7531
      4078 7570 4074 7576 4081 7590 4090 7600
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514

$$

JJM/KEK

606 
WGUS71 KPHI 281645
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1245 PM EDT THU APR 28 2011

PAC025-089-281700-
/O.CON.KPHI.FF.W.0001.000000T0000Z-110428T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON PA-MONROE PA-
1245 PM EDT THU APR 28 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 100 PM EDT FOR MONROE 
AND CARBON COUNTIES...

AT 1237 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAIN HAS MOVED OUT OF THE AREA. WHILE SOME RESIDUAL MINOR 
FLOODING MAY STILL BE ONGOING...THE MOST DANGEROUS FLOODING IS NOW 
OVER. THE FLASH FLOOD WARNING WILL THEREFORE BE ALLOWED TO EXPIRE AT 
1PM.

&&

LAT...LON 4116 7516 4115 7509 4109 7503 4110 7498
      4107 7498 4100 7511 4096 7514 4086 7531
      4078 7570 4074 7576 4081 7590 4090 7600
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 4:24 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Northampton	66 min
Apr 28, 4:36 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	54 min
Apr 28, 5:31 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	59 min
Apr 28, 5:49 AM EDT	Special Weather Statement	PHI	Carbon	56 min
Apr 28, 5:58 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	3 hr
Apr 28, 6:12 AM EDT	Special Weather Statement	PHI	Chester, Delaware, Philadelphia	63 min
Apr 28, 6:18 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	57 min
Apr 28, 6:23 AM EDT	Special Weather Statement	PHI	Berks, Chester, Lehigh, Montgomery	52 min
Apr 28, 6:56 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more	34 min
Apr 28, 7:35 AM EDT	Special Weather Statement	PHI	Bucks	55 min
Apr 28, 8:17 AM EDT	Special Weather Statement	PHI	Berks	58 min
Apr 28, 8:55 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	65 min
Apr 28, 8:59 AM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Apr 28, 9:11 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	49 min
Apr 28, 9:33 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	57 min
Apr 28, 10:00 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	60 min
Apr 28, 10:25 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Carbon, Lehigh, Monroe, Northampton	50 min
Apr 28, 10:48 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery, Northampton	3 hr
Apr 28, 10:57 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	63 min
Apr 28, 10:58 AM EDT	Tornado Warning	PHI	Bucks, Northampton	32 min
Apr 28, 11:11 AM EDT	Severe Thunderstorm Warning	PHI	Northampton	64 min
Apr 28, 12:03 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	57 min
Apr 28, 12:11 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery	31 min
Apr 28, 12:42 PM EDT	Special Weather Statement	PHI	Delaware	63 min
Apr 28, 12:45 PM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	60 min
Apr 28, 1:23 PM EDT	Areal Flood Advisory	PHI	Philadelphia	103 min

Nearby

Flash Flood Warnings in Pennsylvania, 2011 Every flash flood warning in 2011

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.