Alert archive / New Jersey / Flash Flood Warnings in 1991

Flash Flood Warning 21, NWS New York, NY

August 20, 1991Hunterdon County, Somerset County, New Jersey

NWS New York, NY issued this flash flood warning at Aug 20, 1991, 1:15 PM EDT for Hunterdon County, Somerset County, New Jersey. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Aug 20, 1991, 1:15 PM EDT (17:15 UTC)
Expired
Aug 20, 1991, 2:15 PM EDT
In force
60 min
Issued by
NWS New York, NY
Area
Whole counties

Counties Hunterdon County, NJ, Somerset County, NJ

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 5.3 hours before the alert went out and 126 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, Atlantic City In, NJ at 12:00Z on 1991-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 772 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, Atlantic City In, NJ at 12:00Z on 1991-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
772 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
615 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNYC 201714
FFWNYC
NJC035-019-201815-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK CITY NY
115 PM EDT TUE AUG 20 1991
 
THE NATIONAL WEATHER SERVICE IN NEW YORK CITY HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  215 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...S...
 
IN NORTH CENTRAL NEW JERSEY
 
   ...SOMERSET COUNTY
 
IN NORTHWEST NEW JERSEY
 
   ...HUNTERDON COUNTY
 
RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS WAS OVER BUCKS COUNTY
IN SOUTHEASTERN PENNSYLVANIA AND WAS MOVING NORTHEAST AT 35 MPH. THIS
STORMS HAVE A HISTORYY OF PRODUCING VERY STRONG WINDS AND TORRENTIAL
RAINS.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

The office that day

Everything else NWS New York, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 20, 1:15 PM EDTSevere Thunderstorm WarningOKXHunterdon, Somerset60 min
Aug 20, 2:01 PM EDTFlash Flood WarningOKXMiddlesex59 min
Aug 20, 2:01 PM EDTSevere Thunderstorm WarningOKXMiddlesex59 min
Aug 20, 2:20 PM EDTFlash Flood WarningOKXSomerset55 min
Aug 20, 2:20 PM EDTSevere Thunderstorm WarningOKXSomerset55 min
Aug 20, 2:37 PM EDTFlash Flood WarningOKXEssex, Morris, Union68 min
Aug 20, 2:37 PM EDTSevere Thunderstorm WarningOKXEssex, Morris, Union68 min
Aug 20, 3:30 PM EDTFlash Flood WarningOKXBergen, Passaic90 min

Nearby

Flash Flood Warnings in New Jersey, 1991Every flash flood warning in 1991

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.