Alert archive / New Jersey / Flash Flood Warnings in 1999

Flash Flood Warning 36, NWS Philadelphia/Mount Holly

September 16, 1999Camden County, Gloucester County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 16, 1999, 9:25 AM EDT for Camden County, Gloucester County, Salem County, New Jersey. It was in force for 6 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
Sep 16, 1999, 9:25 AM EDT (13:25 UTC)
Expired
Sep 16, 1999, 3:30 PM EDT
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Camden County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 13:25 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 1.4 hours before the alert went out and 198 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 1999-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1326 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 1999-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 262 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1326 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
262 m²/s²
0-3 km storm-relative helicity
316 m²/s²
Significant tornado parameter
1.9
Supercell composite
10.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHL 161325
FFWPHL
DEC001-005-MDC011-015-029-035-041-NJC007-015-033-PAC017-091-161930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
925 AM EDT THU SEP 16 1999

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MONTGOMERY COUNTY IN PENNSYLVANIA.
  BUCKS COUNTY IN PENNSYLVANIA.
  SALEM COUNTY IN NEW JERSEY.
  GLOUCESTER COUNTY IN NEW JERSEY.
  CAMDEN COUNTY IN NEW JERSEY.
  KENT COUNTY IN DELAWARE.
  SUSSEX COUNTY IN DELAWARE.
  CECIL COUNTY IN MARYLAND.
  KENT COUNTY IN MARYLAND.
  QUEEN ANNES COUNTY IN MARYLAND.
  TALBOT COUNTY IN MARYLAND.
  CAROLINE COUNTY IN MARYLAND.

* UNTIL 330 PM EDT.

* HEAVY RAINS ASSOCIATED WITH THE APPROACH OF HURRICANE FLOYD
  HAVE MOVED INTO THE AREA.  RAINFALL RATES HAVE INCREASED...
  WITH MANY LOCATIONS REPORTING OVER ONE INCH OF RAIN PER HOUR.
  FEDERALSBURG MD IN CAROLINE COUNTY REPORTED 1.1 INCHES IN 15
  MINUTES AND HAS RECEIVED 7.5 INCHES OF RAIN SO FAR.

* HEAVY RAINS WILL CONTINUE UNTIL HURRICANE FLOYD PASSES THE
  AREA TONIGHT.

  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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
  QUICKLY. MOVE TO HIGHER GROUND.

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

  .END
GSS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 16, 10:01 AM EDTFlash Flood WarningPHIBurlington, Mercer6 hr
Sep 16, 10:34 AM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset6 hr
Sep 16, 10:34 AM EDTFlash Flood WarningPHIMonmouth6 hr
Sep 16, 12:11 PM EDTFlash Flood WarningPHISussex, Warren5 hr
Sep 16, 2:41 PM EDTFlash Flood WarningPHICamden, Gloucester, Salem6 hr
Sep 16, 2:41 PM EDTFlash Flood WarningPHIBurlington6 hr
Sep 16, 2:50 PM EDTFlash Flood WarningPHIMercer7 hr
Sep 16, 4:21 PM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren5 hr
Sep 16, 4:21 PM EDTFlash Flood WarningPHIMiddlesex, Somerset5 hr
Sep 16, 5:23 PM EDTFlash Flood WarningPHIHunterdon, Somerset4 hr

Nearby

Flash Flood Warnings in New Jersey, 1999Every flash flood warning in 1999

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.