Alert archive / New York / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS New York, NY

January 15, 1999Westchester County, New York

NWS New York, NY issued this flash flood warning at Jan 15, 1999, 10:35 AM EST for Westchester County, New York. 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
Jan 15, 1999, 10:35 AM EST (15:35 UTC)
Expired
Jan 15, 1999, 2:35 PM EST
In force
4 hr
Issued by
NWS New York, NY
Area
Whole counties

County Westchester County, NY

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.6 hours before the alert went out and 81 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 1999-01-15Temperature 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 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 1999-01-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 396 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
370 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
396 m²/s²
0-3 km storm-relative helicity
431 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 151536
FFWNYC
CTC001-007-009-011-NYC119-151935-

BULLETIN - EAS ACTIVIATION/IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1035 AM EST FRI JAN 15 1999

THE NATIONAL WEATHER SERVICE IN NEW YORK HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS FOR...
  NORTHERN WESTCHESTER COUNTY IN SOUTHEASTERN NEW YORK
  AND IN CONNECTICUT...
  NORTHERN FAIRFIELD COUNTY
  NORTHERN NEW HAVEN COUNTY
  MIDDLESEX COUNTY
  NEW LONDON COUNTY

* UNTIL 235 PM EST

* AT 10:30 AM...  NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED VERY HEAVY RAIN FALLING OVER MUCH OF CONNECTICUT AND
  INTO WESTCHESTER COUNTY.  HEAVY RAINS WILL CONTINUE INTO THE
  AFTERNOON AND WILL LIKELY PRODUCE WIDESPREAD ROADWAY FLOODING AND
  SIGNIFICANT PONDING OF WATER IN POOR DRAINAGE AND LOW-LYING
  AREAS.

* DO NOT DRIVE YOUR AUTOMOBILE THROUGH FLOODED ROADWAYS OR
  UNDERPASSES. NEVER DRIVE THROUGH WATER OF UNKNOWN DEPTH. YOU
  ENDANGER THE LIVES OF ALL OCCUPANTS IN YOUR VEHICLE. FIND AN
  ALTERNATE ROUTE.

  MEW/GM

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 15, 8:53 AM ESTFlash Flood WarningOKXNassau, Queens, Suffolk5 hr
Jan 15, 8:53 AM ESTFlash Flood WarningOKXNew York5 hr
Jan 15, 8:53 AM ESTFlash Flood WarningOKXBronx5 hr
Jan 15, 8:53 AM ESTFlash Flood WarningOKXKings5 hr
Jan 15, 8:53 AM ESTFlash Flood WarningOKXRichmond5 hr
Jan 15, 9:19 AM ESTSevere Thunderstorm WarningOKXSuffolk61 min
Jan 15, 9:41 AM ESTFlash Flood WarningOKXWestchester4 hr
Jan 15, 9:41 AM ESTFlash Flood WarningOKXRockland4 hr

Nearby

Flash Flood Warnings in New York, 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.