Alert archive / New York / Flash Flood Warnings in 1989

Flash Flood Warning 32, NWS New York, NY

October 20, 1989Rockland County, Westchester County, New York

NWS New York, NY issued this flash flood warning at Oct 20, 1989, 3:20 PM EDT for Rockland County, Westchester County, New York. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Oct 20, 1989, 3:20 PM EDT (19:20 UTC)
Expired
Oct 20, 1989, 6:00 PM EDT
In force
3 hr
Issued by
NWS New York, NY
Area
Whole counties

Counties Rockland County, NY, 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, 7.3 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 1989-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 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 1989-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 468 square meters per square second.19395878Sfc1 km3 km6 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
564 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
468 m²/s²
0-3 km storm-relative helicity
756 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Oct 20, 9:36 AM EDT, 5 hours 44 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
930 AM EDT FRI OCT 20 1989

...DO NOT USE AFTER 11 AM EDT...

RADAR SHOWED LIGHT TO MODERATE SHOWERS SCATTERED ACROSS NEW JERSEY...
THE METROPOLITAN AREA...LONG ISLAND...SOUTHEASTERN NEW YORK STATE...
EASTERN PENNSYLVANIA...WESTERN THIRD OF CONNECTICUT...AND A SMALL PORTION
OF MASSACHUSETTS. THERE ALSO WAS HEAVY SHOWERS AND POSSIBLE THUNDERSHOWRS
OVER THE OCEAN SOUTH OF LONG ISLAND AND JUST SOUTH OF NEW HEAVEN.
THESE STORMS MIGHT HIT NEW HAVEN AND ISLIP WITHIN THE NEXT 20 MINUTES.

THERE MIGHT BE A SHORT BREAK WITHOUT RAIN BUT IT WILL START UP VERY SHORTLY.
A COLD FRONT ASSOCIATED WITH THE LOW OFF THE MARYLAND KCOAST WILL
MOVE THROUGH THE AREA LATER TODAY GIVING US MORE RAIN SO URBAN
AND SMALL STREAM FLOODING IS STILL POSSIBLE FOR THE AREA TODAY.

THE SHOWERS AND THUNDERSHOWERS WERE MOVING NORTH AT 25 MILES AN HOUR

GSK
Special weather statement, Oct 20, 10:34 AM EDT, 4 hours 46 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1030 AM EDT FRI OCT 20 1989

...DO NOT USE AFTER 12 NOON EDT...

AN EXTENSIVE AREA OF RAIN WITH PATCHES OF MODERATE TO HEAVY RAINSHOWERS
AND POSSIBLE THUNDERSHTORMS WAS LOCATED OVER CENTRAL PENNSYLVANIA...
ALL OF NEW JERSEY...NORTHERN DELAWARE,,,THE NEW YORK METROLPOITAN AREA...
LONG ISLAND...MOST OF CONNECTICUT..SOUTHEASTERN NEW YORK STATE...AND OVER
THE OCEAN ABOUT TO ABOUT 150 MILES SOUTH AND EAST OF NEW YORK CITY.

WITHIN THESE AREA WERE HEAVY SHOWERS OVER CONNECTICUT NEAR BRIDGEPORT AND
OVER NEW JERSEYIN THE COUNTIES OF MONTGOMERY AND BURLINGTON.

THERE MIGHT BE A SHORT BREAK WITHOUT RAIN BUT IT WILL STAR}T UP VERY SHORTLY.
A COLD FRONT ASSOCIATED WITH THE LOW OFF THE MARYLAND COAST WILL
MOVE THROUGH THE AREA LATER TODAY GIVING US MORE RAIN SO URBAN
AND SMALL STREAM FLOODING IS STILL POSSIBLE FOR THE AREA TODAY.
GSK
Special weather statement, Oct 20, 11:38 AM EDT, 3 hours 42 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1130 AM EDT FRI OCT 20 1989

...DO NOT USE AFTER 1 PM EDT...

URBAN AND SMALL STREAM FLOOD WATCH IN EFFECT FOR SOUTHEASTERN NEW YORK
STATE AND NORTHERN NEW JERSEY.....

AN EXTENSIVE AREA OF RAIN WITH PATCHES OF MODERATE TO HEAVY RAINSHOWERS
AND POSSIBLE THUNDERSTORMS WAS LOCATED OVER CENTRAL PENNSYLVANIA...
ALL OF NEW JERSEY...NORTHERN DELAWARE,,,THE NEW YORK METROLPOITAN AREA...
LONG ISLAND...MOST OF CONNECTICUT..SOUTHEASTERN NEW YORK STATE...THE WESTERN
THIRD OF MASSACHUSETTS...AND OVER THE OCEAN OUT TO ABOUT 150 MILES SOUTH
OF NEW YORK CITY.

WITHIN THESE AREA WERE HEAVY SHOWERS OVER CONNECTICUT NEAR BRIDGEPORT AND
OVER MOST OF EASTERN NEW JERSEY.

THERE MIGHT BE A SHORT BREAK WITHOUT RAIN BUT IT WILL START UP VERY SHORTLY.
A COLD FRONT ASSOCIATED WITYH A LOW PRESSURE OFF THE MARYLAND COAST WILL MOVE
THROUGH THE ARE LATER TODAY BRINGING MORE RAIN AND HEAVY AT TIMES. THIS
WILL RESULT IN URBAN AND SMALL STREAM FLOODING FOR TODAY.

THE AREA OF RAIN WAS MOVING NORTH AT 20 MILES AN HOUR.

GSK
Special weather statement, Oct 20, 12:24 PM EDT, 2 hours 56 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1230 PM EDT FRI OCT 20 1989

...DO NOT USE AFTER 2 PM EDT...

URBAN AND SMALL STREAM FLOOD WATCH IN EFFECT FOR SOUTHEASTERN NEW YORK
STATE AND NORTHERN NEW JERSEY.....

AN EXTENSIVE AREA OF RAIN WITH PATCHES OF MODERATE TO HEAVY RAINSHOWERS
AND POSSIBLE THUNDERSTORMS WAS LOCATED OVER CENTRAL PENNSYLVANIA...
ALL OF NEW JERSEY...NORTHERN DELAWARE,,,THE NEW YORK METROLPOITAN AREA...
LONG ISLAND...MOST OF CONNECTICUT..SOUTHEASTERN NEW YORK STATE...THE WESTERN
THIRD OF MASSACHUSETTS...AND OVER THE OCEAN OUT TO ABOUT 150 MILES SOUTH
OF NEW YORK CITY.

WITHIN THESE AREA WERE HEAVY SHOWERS OVER CONNECTICUT NEAR BRIDGEPORT AND
OVER MOST OF EASTERN NEW JERSEY.

THERE MIGHT BE A SHORT BREAK WITHOUT RAIN BUT IT WILL START UP VERY SHORTLY.
A COLD FRONT ASSOCIATED WITYH A LOW PRESSURE OFF THE MARYLAND COAST WILL MOVE
THROUGH THE AREA LATER TODAY BRINGING MORE RAIN AND HEAVY AT TIMES. THIS
WILL RESULT IN URBAN AND SMALL STREAM FLOODING FOR TODAY.

THE AREA OF RAIN WAS MOVING NORTH AT 20 MILES AN HOUR.

GSK
Special weather statement, Oct 20, 1:29 PM EDT, 1 hour 51 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
130 PM EDT FRI OCT 20 1989

...DO NOT USE AFTER 3 PM EDT...

URBAN AND SMALL STREAM FLOOD WARNING EFFECT FOR SOUTHEASTERN NEW YORK
STATE INCLUDING NEW YORK CITY...WESTCHESTER AND ROCKLAND COUNTIES...NORTHERN
NEW JERSEY.

AN EXTENSIVE AREA OF RAIN WITH PATCHES OF MODERATE TO HEAVY RAINSHOWERS
WAS LOCATED OVER EASTERN PENNSYLVANIA...THE NORTHERN TWO THIRDS OF NEW JERSEY
...THE NEW YORK METROLPOITAN AREA...LONG ISLAND...MOST OF CONNECTICUT...
THE WESTERN HALF OF MASSACHUSETTS...THE LOWER HUDSON VALLEY...AND OUT OVER
THE OCEAN OUT OT 150 MILES SOUTH OF NEW YORK CITY.

WITHIN THESE AREA WERE HEAVY SHOWERS OVER CONNECTICUT NEAR NEW HAVEN.

A COLD FRONT ASSOCIATED WITYH A LOW PRESSURE OFF THE MARYLAND COAST WILL MOVE
THROUGH THE AREA LATER TODAY BRINGING MORE RAIN AND HEAVY AT TIMES. THIS
WILL RESULT IN URBAN AND SMALL STREAM FLOODING FOR TODAY.

THE AREA OF RAIN WAS MOVING NORTH AT 20 MILES AN HOUR.

GSK
Special weather statement, Oct 20, 2:30 PM EDT, 50 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
230 PM EDT FRI OCT 20 1989

...DO NOT USE AFTER 4 PM EDT...

URBAN AND SMALL STREAM FLOOD WARNING EFFECT FOR SOUTHEASTERN NEW YORK
STATE INCLUDING NEW YORK CITY...WESTCHESTER AND ROCKLAND COUNTIES...NORTHERN
NEW JERSEY.

AN EXTENSIVE AREA OF RAIN WITH PATCHES OF MODERATE TO HEAVY RAINSHOWERS
WAS LOCATED OVER THE NORTHERN TWO THIRDS OF NEW JERSEY...THE NEW YORK
METROLPOITAN AREA...LONG ISLAND...MOST OF CONNECTICUT...THE WESTERN HALF
OF MASSACHUSETTS...THE LOWER HUDSON VALLEY...AND OUT OVER THE OCEAN OUT TO
ABOUT 150 MILES SOUTH OF NEW YORK CITY.

WITHIN THESE AREA WERE HEAVY SHOWERS OVER WESTERN CONNECTICUT AN9D OVER
CENTRAL LONG ISLAND.

THE RAIN WAS MOVING NORTHEAST AT 20 MILES AN HOUR.

GSK

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 20, 11:00 AM EDTFlash Flood WarningOKXMonmouth4 hr
Oct 20, 11:00 AM EDTFlash Flood WarningOKXHunterdon, Somerset4 hr
Oct 20, 11:00 AM EDTFlash Flood WarningOKXWarren4 hr
Oct 20, 12:15 PM EDTFlash Flood WarningOKXMorris, Passaic, Sussex4 hr
Oct 20, 12:15 PM EDTFlash Flood WarningOKXEssex4 hr
Oct 20, 6:00 PM EDTFlash Flood WarningOKXMorris, Somerset2 hr
Oct 20, 12:00 PM EDTFlash Flood WarningOKXBronx, New York3 hr
Oct 20, 12:00 PM EDTFlash Flood WarningOKXNassau, Suffolk3 hr
Oct 20, 12:00 PM EDTFlash Flood WarningOKXRockland, Westchester3 hr
Oct 20, 12:00 PM EDTFlash Flood WarningOKXRichmond3 hr
Oct 20, 12:00 PM EDTFlash Flood WarningOKXKings, Queens3 hr
Oct 20, 3:20 PM EDTFlash Flood WarningOKXBronx, New York3 hr
Oct 20, 3:20 PM EDTFlash Flood WarningOKXKings, Nassau, Queens3 hr
Oct 20, 3:20 PM EDTFlash Flood WarningOKXRichmond3 hr
Oct 20, 3:20 PM EDTFlash Flood WarningOKXSuffolk3 hr

Nearby

Flash Flood Warnings in New York, 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.