Alert archive / Connecticut / Flash Flood Warnings in 1999

Flash Flood Warning 69, NWS New York, NY

September 17, 1999Naugatuck Valley Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Sep 17, 1999, 1:38 AM EDT for Naugatuck Valley Planning Region, Connecticut. It was in force for 6 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: Sep 17, 1999, 1:38 AM EDT (05:38 UTC)
Expired: Sep 17, 1999, 8:00 AM EDT
In force: 6 hr
Issued by: NWS New York, NY
Area: Whole counties

County Naugatuck Valley Planning Region, CT

The radar

The Brookhaven radar (KOKX), 75 km from the middle of the area, began a volume at 05:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 5.6 hours before the alert went out and 75 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 385 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 256 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 KOKX 170547 COR
FFWNYC
CTC001-009-NJC003-013-017-031-039-NYC071-079-087-119-171200-

FLOOD WARNING...CORRECTION
NATIONAL WEATHER SERVICE NEW YORK NY
138 AM EDT FRI SEP 17 1999

THE NATIONAL WEATHER SERVICE IN NEW YORK CONTINUES THE...

* FLOOD WARNINGS FOR SMALL STREAMS AND URBAN AREAS FOR PERSONS 
  LIVING IN THE FOLLOWING AREAS...

  IN NORTHEAST NEW JERSEY...
  BERGEN...ESSEX...UNION...HUDSON...AND PASSAIC COUNTIES.

  IN SOUTHEAST NEW YORK...
  ORANGE...ROCKLAND...WESTCHESTER...AND PUTNAM COUNTIES.

  IN SOUTHWEST CONNECTICUT...
  FAIRFIELD AND NEW HAVEN COUNTIES.

* UNTIL 800 AM EDT...

* MAJOR SMALL STREAM FLOODING WILL CONTINUE OVERNIGHT ACROSS THE 
  WARNING AREA. MOST SMALL STREAMS HAVE CRESTED OR ARE NEARING
  THEIR CREST AT THIS TIME. HOWEVER MANY OF THESE STREAMS REMAIN
  OUT OF THEIR BANKS. FLOODING WILL CONTINUE THROUGH THE OVERNIGHT 
  HOURS.

  IN NEW HAVEN COUNTY...THE QUINNIPIAC RIVER CONTINUES TO RISE AT
  WALLINGFORD.

* BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
  THE DANGER OF FLOODING.

.END/MCKILLOP

CORRECTION TO FORMAT AND CODING

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.

NWS New York, NY wrote its last area forecast discussion before this flash flood warning went out at Sep 16, 10:15 PM EDT, 3 hours 23 minutes earlier.

Area forecast discussion, Sep 16, 10:15 PM EDT, 3 hours 23 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
1015 PM EDT THU SEP 16 1999

DOPPLER FIXES SHOWED FLOYD MOVG ACRS LNG ISL SD TWD NEW HAVEN CTY.
STDY RAINFALL HAD ENDED OVR MOST OF THE FCST AREA. IN OVRNGT UPDTS
WL KP OCNL LGT RAIN IN THE ZNS TIL ARND MIDN THEN KP SKIES MSTLY
CLDY.

SFC WNDS WERE SHFTG FM SE TO N IN RESPONSE TO FLOYDS MVMNT AND WL
SHFT INTO THE NW AFT MIDN AS THE STORM CONTS INTO NEW ENG. GRAD WL
RMN TIGHT ARND THE BCKSIDE OF THE STRM WELL INTO FRI. TROP STRM
WRNGS WL RMN UP OVRNGT...AS WL WND ADVSRIES WELL INLD N AND W OF
NYC.

FLD WRNGS...MAINLY FOR SML STRMS..WL RMN UP OVR MUCH OF THE FCST
AREA TNGT. SEE BELOW.

.NYC/OKX...TS WRNG NYZ069>081-NJZ003>006-011-
                   CTZ005>012-
                   ANZ355-353-350-335-330-338.
           WIND ADVISORY...NYZ067-068-NJZ002.
           FLOOD WARNING...NYC067>071-NJZ002>006-011-CTZ005-006-
                   009-010.

EY

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 1:38 AM EDT	Flash Flood Warning	OKX	Greater Bridgeport Planning Region	6 hr
Sep 17, 7:49 AM EDT	Flash Flood Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	7 hr
Sep 17, 3:52 PM EDT	Flash Flood Warning	OKX	Naugatuck Valley Planning Region	5 hr

Nearby

Flash Flood Warnings in Connecticut, 1999 Every 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; radar from the NEXRAD Level II archive.