Alert archive / New York / Flash Flood Warnings in 1990

Flash Flood Warning 6, NWS New York, NY

August 10, 1990Westchester County, New York

NWS New York, NY issued this flash flood warning at Aug 10, 1990, 8:55 AM EDT for Westchester County, New York. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 10, 1990, 8:55 AM EDT (12:55 UTC)
Expired
Aug 10, 1990, 12:00 PM EDT
In force
3 hr
Issued by
NWS New York, NY
Area
Whole counties

County Westchester County, NY

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

Albany, NY (KALB), launched 12:00Z, 0.9 hours before the alert went out and 171 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, Albany, NY at 12:00Z on 1990-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 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, Albany, NY at 12:00Z on 1990-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
5 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
137 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 KNYC 101256
FFWNYC
NYC119-101600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
URBAN AND SMALL STREAM FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
855 AM EDT FRI AUG 10 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED AN URBAN AND SMALL STREAM
FLOOD WARNING EFFECTIVE UNTIL 12 NOON EDT FOR PEOPLE IN THE
FOLLOWING COUNTY

   IN THE STATE OF NEW YORK
      WESTCHESTER

LOCALIZED EARLY MORNING RAINS OF OVER 2 INCHES IN WESTCHESTER COUNTY
HAVE ADDED TO THE RAIN OF PREVIOUS DAYS AND CAUSED FURTHER FLOOD
PROBLEMS. NOTABLY...THE SAW MILL RIVER PARKWAY WAS CLOSED AT A COUPLE
OF LOCATIONS DUE TO HIGH WATER FROM THE SAW MILL RIVER. ALSO THE BRONX
RIVER PARKWAY NEAR WHITE PLAINS WAS CLOSED.

RADAR SHOWS MORE RAIN HEADING TOWARD WESTCHESTER COUNTY AND THIS COULD
CAUSE FURTHER FLOOD PROBLEMS ON ROADS AND SMALL STREAMS AND CREEKS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE 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 IMMEDIATELY.
MOVE TO HIGHER GROUND.

PERSONS LIVING NEAR STREAMS AND CREEKS SHOULD WATCH FOR RISING WATER AND
BE PREPARED TO MOVE TO HIGHER GROUND IMMEDIATELY.

POIRIER

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 10, 5:13 AM EDT, 3 hours 42 minutes before
NJZ015-NYZ014-015-101200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
500 AM EDT FRI AUG 10 1990

...HEAVY DOWNPOURS IN AND AROUND THE NEW YORK CITY METRO AREA...

TROPICAL-LIKE SHOWERS ACCOMPANIED BY HEAVY DOWNPOURS DUMPED OVER ONE
INCH OF RAIN...1.25 INCHES...BETWEEN 4 AM AND 5 AM IN CENTRAL PARK.
THE HEAVY RAINS HAVE OCCURRED THROUGHOUT NEW YORK CITY AS WELL AS OVER
HUDSON AND BERGEN COUNTIES IN NEW JERSEY AND ARE MOVING NORT)H THROUGH
ROCKLAND AND WESTCHESTER.

THERE IS WIDESPREAD POOR DRAINAGE FLOODING. THE MORNING COMMUTE WILL
BE A DIFFICULT ONE FOR MANY...SO LEAVE EXTRA TIME GETTING TO WORK TODAY.

EY

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 12:00 PM EDTFlash Flood WarningOKXWestchester4 hr
Aug 10, 3:45 PM EDTTornado WarningOKXRichmond45 min
Aug 10, 5:00 PM EDTTornado WarningOKXRichmond45 min
Aug 10, 5:45 PM EDTTornado WarningOKXRichmond30 min

Nearby

Flash Flood Warnings in New York, 1990Every flash flood warning in 1990

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.