Alert archive / New Jersey / Flash Flood Warnings in 1989

Flash Flood Warning 4, NWS Philadelphia/Mount Holly

May 10, 1989Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 10, 1989, 3:50 PM EDT for Mercer County, New Jersey. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 10, 1989, 3:50 PM EDT (19:50 UTC)
Expired
May 10, 1989, 8:00 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Mercer County, NJ

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.8 hours before the alert went out and 268 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 1989-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1989-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 240 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
240 m²/s²
0-3 km storm-relative helicity
212 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 101956
FFWPHL
NJC021-110000-

BULLETIN - EBS ACTIVATION REQUESTED
SMALL STREAM FLOOD WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
350 PM EDT TUE MAY 10 1989

THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS EXTENDED THE SMALL
STREAM FLOOD WARNING UNTIL 800 PM EDT FOR PEOPLE IN THE FOLLOWING
COUNTY...

IN WEST CENTRAL NEW JERSEY
          ...MERCER

...SMALL STREAM FLOOD WARNING FOR THE ASSUNPINK CREEK...

THE AUTOMATIC RIVER GAGE ON THE ASSUNPINK CREEK AT 345 PM INDICATED A
LEVEL OF 7.42 FEET.  FLOOD STAGE FOR THE ASSUNPINK CREEK IS 7.00 FEET.

THE ASSUNPINK CREEK SHOULD FLUCTUATE BETWEEN 7.5 AND 8 FEET UNTIL 6 PM
EDT AND THEN BEGIN FALLING AFTER THAT.  IT SHOULD FALL BELOW BANKFULL
AROUND 800 PM THIS AFTERNOON.

FLOODING BEGAN ALONG THE ASSUNPINK AROUND 2 PM EDT.  LIGHT TO
MODERATE RAIN WILL FALL ALONG THE ASSUNPINK BETWEEN 4 PM AND 6 PM EDT.

IF YOU LIVE IN MERCER COUNTY AND ARE IN AN AREA SUBJECT TO FLOODING...
PLEASE MOVE TO HIGHER GROUND IMMEDIATELY...AND DO NOT DRIVE THROUGH
FLOODED ROADWAYS.

DPG

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 1:30 PM EDTFlash Flood WarningPHIMercer3 hr

Nearby

Flash Flood Warnings in New Jersey, 1989Every flash flood warning in 1989

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.