Alert archive / Pennsylvania / Flash Flood Warnings in 2002

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

May 13, 2002Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at May 13, 2002, 4:57 PM EDT for Berks County, Pennsylvania. 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 counties it named.

The facts

Issued: May 13, 2002, 4:57 PM EDT (20:57 UTC)
Expired: May 13, 2002, 7:00 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 20:58 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 12:00Z, 9.0 hours before the alert went out and 206 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: 313 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1186 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 132057
FFWPHI
PAC011-132300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
455 PM EDT MON MAY 13 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ IS CONTINUING A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA

* UNTIL 700 PM EDT.

* AT 453 PM EDT...WEATHER SERVICE RADAR INDICATED HEAVY RAIN 
  CONTINUING IN SOUTHEASTERN BERKS COUNTY WITH OVER 4 INCHES 
  OF RAIN IN SOME LOCATIONS. FLOODING HAS BEEN REPORTED ON SOME
  ROADWAYS IN THE AREA.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

$$

JJM

LAT...LON 4048 7561 4043 7557 4032 7565 4025 7570
          4023 7577 4031 7579

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks	42 min
May 13, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	34 min
May 13, 3:02 PM EDT	Severe Thunderstorm Warning	PHI	Berks	28 min
May 13, 3:08 PM EDT	Tornado Warning	PHI	Berks	37 min
May 13, 3:08 PM EDT	Tornado Warning	PHI	Berks	112 min
May 13, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	24 min
May 13, 3:25 PM EDT	Flash Flood Warning	PHI	Berks	95 min
May 13, 4:40 PM EDT	Severe Thunderstorm Warning	PHI	Chester	65 min
May 13, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	42 min
May 13, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	39 min

Nearby

Flash Flood Warnings in Pennsylvania, 2002 Every flash flood warning in 2002

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.