Alert archive / New York / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 28, NWS Buffalo, NY

July 23, 1991Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 23, 1991, 2:19 AM EDT for Allegany County, Cattaraugus County, New York. It was in force for 56 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 23, 1991, 2:19 AM EDT (06:19 UTC)
Expired
Jul 23, 1991, 3:15 AM EDT
In force
56 min
Issued by
NWS Buffalo, NY
Area
Whole counties

Counties Allegany County, NY, Cattaraugus County, NY

What was reported inside it

TimeReportWhereRemark
Jul 23, 2:48 AM EDTThunderstorm Wind 0Cattaraugus, NY
Jul 23, 2:50 AM EDTThunderstorm Wind 0Allegany, NY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 6.3 hours before the alert went out and 80 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, Buffalo Intl Airport, NY at 00:00Z on 1991-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1173 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, Buffalo Intl Airport, NY at 00:00Z on 1991-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 square meters per square second.193958Sfc1 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
1173 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
944 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
345 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBUF 230620
SVRBUF
NYC003-009-230715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
219 AM EDT TUE JUL 23 1991

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 AM EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...

IN  NEW YORK
          ...ALLEGANY AND CATTARAUGUS

AT 210 AM RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS OVER NORTHERN
PORTIONS OF CHUATAUQUA AND CATTARAUGUS COUNTIES. TREES AND POWER LINES
HAVE BEEN REPORTED DOWN IN FREDONIA AND THE TOWN OF SHERIDAN.

THE THUNDERSTORMS WERE MOVING EAST AT 40 MILES AN HOUR.

BE ON THE ALERT FOR THUNDERSTORMS ACCOMPANIED BY FREQUENT LIGHTNING
STRONG DAMAGING WINDS AND LARGE HAIL. LOCALLY HEAVY RAIN MAY ALSO
CAUSE POOR DRAINAGE FLOODING.

IF THREATENING WEATHER APPROACHES GO TO A SAFE PLACE IMMEDIATELY. IN
HOMES A BASEMENT OR INTERIOR ROOM IS THE SAFEST LOCATION.

WEBBER

What forecasters said that day

The local office's own words before this severe thunderstorm 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, Jul 23, 1:55 AM EDT, 24 minutes before
NYZ001-022-230700-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE BUFFALO NY
140 AM EDT TUE JUL 23 1991

DO NOT USE AFTER 3 AM...

AT 140 AM...A GROWING AREA OF THUNDERSTORMS COVERED MUCH OF EASTERN
LAKE ERIE...THE NORTHWEST CORNER OF PENNSYLVANIA...AND PORIONS OF
SOUTHWEST NEW YORK.

THE ACTIVITY WAS MOST CONCENTRATED IN A 20 MILE WIDE AREA WHICH STRETCHED
FROM LONG POINT...EAST ACROSS THE LAKE INTO NORTHERN CHAUTAUQUA AND
EXTREME SOUTHERN ERIE COUNTIES OF NEW YORK. STRONGEST STORMS WERE NEAR
GOWANDA...DUNKIRK...AND 10 MILES NORTH OF WESTFIELD.

THESE STORMS HAVE BEEN ACCOMPANIED BY FREQUENT LIGHTNING...HEAVY DOWNPOURS
...AND GUSTY WINDS.

MOVEMENT WAS EAST AT 45 MILES AN HOUR.

ELSEWHERE...THUNDERSTORMS WERE OVER EASTERN LAKE ONTARIO NEAR
WATERTOWN...AND OVER CENTRAL NEW YORK EAST OF SYRACUSE.

A NEW AREA OF THUNDERSTORMS WAS OVER SOUTHWESTERN ONTARIO FROM
ST THOMAS BACK TO DETROIT.

MOVEMENT OF THESE STORMS WAS EAST AT 40 MILES AN HOUR.

SFM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 5:00 AM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus60 min

Nearby

Severe Thunderstorm Warnings in New York, 1991Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.