Alert archive / New Jersey / Flash Flood Warnings in 1999

Flash Flood Warning 22, NWS Philadelphia/Mount Holly

August 14, 1999Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 14, 1999, 8:20 AM EDT for Mercer County, New Jersey. It was in force for 4 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
Aug 14, 1999, 8:20 AM EDT (12:20 UTC)
Expired
Aug 14, 1999, 12:00 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 12:21 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

Brookhaven, NY (KOKX), launched 12:00Z, 0.3 hours before the alert went out and 168 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, Brookhaven, NY at 12:00Z on 1999-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 28 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, Brookhaven, NY at 12:00Z on 1999-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 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
28 J/kg
Mixed-layer CIN
-255 J/kg
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
70 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 
TTAA00 KPHL 141221
FFWPHL
NJC021-141600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
820 AM EDT SAT AUG 14 1999

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS CONTINUED THE

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN NEW JERSEY.

* UNTIL NOON EDT.

* THUNDERSTORMS OVERNIGHT DROPPED BETWEEN 2 AND 5 INCHES OF RAIN
  ACROSS MERCER COUNTY NEW JERSEY. THE LEVEL OF THE ASSUNPINK
  CREEK AT TRENTON WAS AT 8.6 FEET AT 810 AM...ABOVE THE FLOOD STAGE
  OF 7 FEET. OTHER SMALL STREAMS...SUCH AS STONY BROOK CREEK NEAR
  PRINCETON...ARE LIKELY OVER THEIR BANKS FROM THE HEAVY RAIN.
  RIVER LEVELS WILL CONTINUE TO FALL SLOWLY THROUGH THE MORNING...AND
  SHOULD RETURN BELOW FLOOD STAGE BY AFTERNOON. HOWEVER...MORE
  SHOWERS AND THUNDERSTORMS ARE LIKELY LATER TODAY.

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

  .END

KRAUS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 10:56 PM EDTSevere Thunderstorm WarningPHISussex49 min
Aug 14, 2:14 AM EDTFlash Flood WarningPHIMercer3 hr
Aug 14, 4:58 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem47 min
Aug 14, 5:51 PM EDTSevere Thunderstorm WarningPHIBurlington49 min

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.