Alert archive / Pennsylvania / Flash Flood Warnings in 2008

Flash Flood Warning 28, NWS Philadelphia/Mount Holly

August 15, 2008Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 15, 2008, 2:49 PM EDT for Monroe County, 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: Aug 15, 2008, 2:49 PM EDT (18:49 UTC)
Expired: Aug 15, 2008, 6:45 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Monroe County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 18:51 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
Aug 15, 3:15 PM EDT	FLOOD	3 Wsw Stormville, PA	SOME STREET AND POOR DRAINAGE FLOODING IN HAMILTON TOWNSHIP.

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 12:00Z, 6.8 hours before the alert went out and 202 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: 192 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 91 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.

000 
WGUS51 KPHI 151849
FFWPHI
PAC089-152245-
/O.NEW.KPHI.FF.W.0028.080815T1849Z-080815T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
249 PM EDT FRI AUG 15 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 243 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. OVER TWO 
  INCHES OF RAIN HAS FALLEN SO FAR AND ADDITIONAL HEAVY RAINFALL IS 
  EXPECTED.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STORMVILLE

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 4099 7516 4093 7521 4091 7525 4088 7527
      4087 7529 4085 7543 4101 7537

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 3:24 PM EDT	Flash Flood Warning	PHI	Northampton	4 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.