Alert archive / Pennsylvania / Flash Flood Warnings in 2008

Flash Flood Warning 7, NWS Philadelphia/Mount Holly

June 10, 2008Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 10, 2008, 6:47 PM EDT for Berks County, Lehigh County, 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 10, 2008, 6:47 PM EDT (22:47 UTC)
Expired: Jun 10, 2008, 9:20 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 129 km from the middle of the area, began a volume at 22:50 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 122 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: 1286 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1568 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 20 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.

000 
WGUS51 KPHI 102252
FFWPHI
PAC011-077-110245-
/O.NEW.KPHI.FF.W.0007.080610T2247Z-080611T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
647 PM EDT TUE JUN 10 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 1045 PM EDT

* AT 645 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY
  HEAVY RAINFALL FROM THUNDERSTORMS OVER THE WARNING AREA. 
  ADDITIONAL HEAVY RAINFALL IS EXPECTED. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CLAUSSVILLE...KUTZTOWN AND ANCIENT OAKS

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.  BE CAREFUL AS FLOODING WILL CONTINUE 
AFTER SUNSET AND VISIBILITY WILL BE RESTRICTED.

LAT...LON 4065 7567 4054 7553 4034 7582 4045 7595
TIME...MOT...LOC 2247Z 180DEG 0KT 4047 7581

$$

SZATKOWSKI

1 follow-up statement

000 
WGUS71 KPHI 110120
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
920 PM EDT TUE JUN 10 2008

PAC011-077-110127-
/O.CAN.KPHI.FF.W.0007.000000T0000Z-080611T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-
920 PM EDT TUE JUN 10 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LEHIGH AND
CENTRAL BERKS COUNTIES...

THE INTENSE THUNDERSTORMS OF EARLIER HAVE MOVED WELL NORTHEAST OF 
THE REGION AND WEAKENED, THEREFORE THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

SOME ADDITIONAL SHOWERS AND POSSIBLE THUNDERSTORMS WILL MOVE ACROSS 
THE AREA BEFORE MIDNIGHT WITH LOCALLY HEAVY RAIN POSSIBLE.

LAT...LON 4065 7567 4054 7553 4034 7582 4045 7595
TIME...MOT...LOC 0117Z 180DEG 0KT 4047 7581

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	58 min
Jun 10, 5:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	54 min
Jun 10, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	40 min
Jun 10, 6:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	59 min
Jun 10, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	48 min
Jun 10, 7:02 PM EDT	Severe Thunderstorm Warning	PHI	Chester	58 min
Jun 10, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	77 min
Jun 10, 7:36 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	54 min

Nearby

Flash Flood Warnings in Pennsylvania, 2008 Every flash flood warning in 2008

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.