Alert archive / Pennsylvania / Flash Flood Warnings in 2006

Flash Flood Warning 36, NWS Philadelphia/Mount Holly

June 28, 2006Chester County, Delaware County, Pennsylvania; Cecil County, Maryland; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 28, 2006, 2:13 AM EDT for Chester County, Delaware County, Pennsylvania; Cecil County, Maryland; New Castle County, Delaware. It was in force for 2 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 28, 2006, 2:13 AM EDT (06:13 UTC)
Expired: Jun 28, 2006, 4:15 AM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties New Castle County, DE, Cecil County, MD, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 06:12 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, 6.2 hours before the alert went out and 167 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 280616
FFWPHI
DEC003-MDC015-PAC029-045-280815-

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND
  NEW CASTLE COUNTY IN NORTHERN DELAWARE
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
  THIS INCLUDES THE CITY OF SPRINGFIELD

* UNTIL 415 AM EDT

* AT 208 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 3945 7605 3941 7581 3935 7560 3967 7555
      3991 7529 4014 7554 4024 7568 4013 7587
      3968 7611

$$

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, 2:31 AM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton, Philadelphia	119 min
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
Jun 28, 12:16 AM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	44 min
Jun 28, 1:28 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	47 min

Nearby

Flash Flood Warnings in Pennsylvania, 2006 Flash Flood Warnings in Maryland, 2006 Flash Flood Warnings in Delaware, 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.