Alert archive / New York / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 40, NWS Buffalo, NY

July 31, 1999Monroe County, Wayne County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 31, 1999, 5:09 PM EDT for Monroe County, Wayne County, New York. It was in force for 66 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 31, 1999, 5:09 PM EDT (21:09 UTC)
Expired: Jul 31, 1999, 6:15 PM EDT
In force: 66 min
Issued by: NWS Buffalo, NY
Area: Whole counties

Counties Monroe County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 118 km from the middle of the area, began a volume at 21:09 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.

What was reported inside it

Time	Report	Where	Remark
Jul 31, 5:15 PM EDT	Thunderstorm Wind	Henrietta, NY
Jul 31, 6:00 PM EDT	Thunderstorm Wind	Palmyra, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 4:15 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.2 hours before the alert went out and 115 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: 2312 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 76 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.

073 
WUUS1 KBUF 312109 RRA
SVRBUF
NYC055-117-312215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
509 PM EDT SAT JUL 31 1999

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONROE COUNTY IN WESTERN NEW YORK
  WESTERN WAYNE COUNTY IN WESTERN NEW YORK

* UNTIL 615 PM EDT

* AT 5:05 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR HENRIETTA...MOVING NORTHEAST AT 40 MILES
  AN HOUR.

* THE SEVERE THUNDERSTORM WILL BE NEAR WEBSTER BY 5:20 PM EDT
  AND WESTERN WAYNE COUNTY 5:35 PM EDT.


IF YOU ARE IN THESE AREAS...SEEK SAFETY IN A SMALL INTERIOR ROOM
AWAY FROM WINDOWS. A BASEMENT OFFERS THE BEST PROTECTION.



RSH

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.

NWS Buffalo, NY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 3:47 PM EDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 31, 3:47 PM EDT, 1 hour 22 minutes before

AREA FORECAST DISCUSSION UPDATED FOR ZNS IN WATCH
NATIONAL WEATHER SERVICE BUFFALO NY
347 PM EDT SAT JUL 31 1999

18Z SURFACE CHART SHOWS LOW OVR SOUTHERN LK HURON WITH WARM FRNT
EXTENDING EAST INTO WNY AND THEN TURNING SE INTO EAST CENTRAL PA. IN
WARM SECTOR VERY HIGH TEMPS AND DEW PTS WITH 95/72 AND 97/74 AT 18Z
AT DUNKIRK/ERIE RESPECTIVELY. APPARENT TEMPS GETTING TO NR 105 RANGE
IN SW NY. HAVE HAD SPS OUT ABOUT HEAT INDICES EARLIER TODAY AND FEEL
WITH PRECIP COMING IN NO HEAT ADVSRY WILL BE NECESSARY FOR THIS
EVENING.
MANY LOCATIONS HAVE REACHED OR EXCEEDED 90 ALREADY.

AREA RADARS SHOWING FIRST BATCH OF SHWRS/TSTMS APPROACHING EASTERN
END OF LK ONT ATTM. MORE SIGNIFICANT AREA OF TSTMS OVR SW ONTARIO
PROVINCE AHEAD OF SURFACE LOW IN AREA OF STRNG SMCV. OTHER CONVECTION
DEVELOPING IN SOUTHERN TIER WHERE IMPRESSIVE 2HR SURFACE THETA E
CHANGE.

LIS IN -5 TO -9 RANGE OVR THE FCST AREA AS WELL AND 2HR SURFACE CAPE
CHANGE IN 500 TO 1500 RANGE WEST OF GENESEE VALLEY.

WILL GO WITH LKLY POPS MOST AREAS TNGT BUT CATEGORICAL WESTERN
SOUTHERN TIER. MM5 ONLY OUT TO 17 HRS BUT SHOWING SOME VERY HIGH HRLY
PRECIP READOUTS OF AN INCH/HR IN 23-01Z TIME FRAME NR YTR HEADING TO
EASTERN LK ONT CNTYS FRM 01Z-05Z.

WILL TAPER OFF PRECIP NIAGARA FRONTIER AFT 2AM BUT NOT MENTION ENDING
OF PRECIP IN AREAS FURTHER TO THE EAST AND SOUTH AS IT SHLD BE MORE
TWD PREDAWN HRS.

LESS HUMID AIR MOVES INTO THE REGION SUN AFTN WITH DEW PTS DROPPING
INTO 50S. 2M TEMPS ON BUFKIT SHOW LOW TO MID 80S ON SUNDAY BUT WITH
LOWERING HUMIDITIES IT SHLDNT BE AS OPPRESSIVE AS PAST COUPLE OF
DAYS.

NW FLOW OF COOLER/DRIER AIR MOVES IN SUNDAY NIGHT AND MONDAY FROM
HIGH OVR NORTHERN PLAINS.

UPDATE....
SPC ISSUING SVR TSTM WATCH FOR PTNS OF WNY THIS EVENING. WILL HOLD
ZNS RELEASE TIL WATCH INFO COMES FRM ALY.

.BUF...SVR TSTM WATCH UNTIL 10PM EDT NYZ001>004-010>014-019>021

JJP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 4:46 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	64 min
Jul 31, 4:53 PM EDT	Severe Thunderstorm Warning	BUF	Erie	62 min
Jul 31, 5:02 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Orleans	78 min
Jul 31, 5:15 PM EDT	Severe Thunderstorm Warning	BUF	Wyoming	65 min
Jul 31, 5:20 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	65 min
Jul 31, 5:32 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Livingston	78 min
Jul 31, 5:36 PM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	79 min
Jul 31, 5:50 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	95 min
Jul 31, 6:19 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	76 min
Jul 31, 6:24 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	76 min
Jul 31, 6:48 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	62 min
Jul 31, 6:57 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	33 min

Nearby

Severe Thunderstorm Warnings in New York, 1999 Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.