Alert archive / Pennsylvania / Flash Flood Warnings in 2006

Flash Flood Warning 37, NWS Philadelphia/Mount Holly

June 28, 20066 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 28, 2006, 2:31 AM EDT for 6 counties in Pennsylvania. It was in force for 119 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: Jun 28, 2006, 2:31 AM EDT (06:31 UTC)
Expired: Jun 28, 2006, 4:30 AM EDT
In force: 119 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

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

The radar

The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 06:33 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, 6.5 hours before the alert went out and 225 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: 408 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 280633
FFWPHI
PAC011-017-077-091-095-101-280830-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
231 AM EDT WED JUN 28 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA 
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA
  NORTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA 

* UNTIL 430 AM EDT

* AT 229 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A LARGE AREA OF MODERATE TO HEAVY RAIN MOVING INTO THE AREA        
  FROM THE SOUTH. RAINFALL RATES OF 1 TO 2 INCHES PER HOUR CAN       
  BE EXPECTED IN SOME LOCATIONS AS THIS AREA OF PRECIPITATION        
  MOVES THROUGH. GIVEN THE VERY WET CONDITIONS WHICH ALREADY EXIST,  
  FLASH FLOODING IS LIKELY IN AREAS OF HEAVIEST RAIN.

 
LAT...LON 3996 7521 3997 7507 4004 7501 4020 7486
      4043 7507 4082 7534 4060 7592 4047 7632
      4020 7589 4028 7560

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 8:43 PM EDT	Flash Flood Warning	PHI	Carbon	3 hr
Jun 27, 9:10 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	2 hr
Jun 27, 9:21 PM EDT	Flash Flood Warning	PHI	Monroe	114 min
Jun 27, 10:08 PM EDT	Flash Flood Warning	PHI	Berks	6 hr
Jun 28, 12:03 AM EDT	Flash Flood Warning	PHI	Carbon	4 hr
Jun 28, 2:13 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	2 hr
Jun 28, 3:55 AM EDT	Flash Flood Warning	PHI	Carbon, Monroe	4 hr
Jun 28, 4:45 AM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery, Northampton, Philadelphia	3 hr
Jun 28, 3:04 PM EDT	Coastal Flood Statement	PHI	Delaware, Philadelphia	54 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2006 Every flash flood warning in 2006

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.