Alert archive / New York / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 39, NWS Buffalo, NY

July 31, 1999Genesee County, Orleans County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 31, 1999, 5:02 PM EDT for Genesee County, Orleans County, New York. It was in force for 78 min. 1 report 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, 5:02 PM EDT (21:02 UTC)
Expired: Jul 31, 1999, 6:20 PM EDT
In force: 78 min
Issued by: NWS Buffalo, NY
Area: Whole counties

Counties Genesee County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 49 km from the middle of the area, began a volume at 21:04 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, 5:30 PM EDT	Thunderstorm Wind	Bergen, 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, 9.0 hours before the alert went out and 47 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.

000 
TTAA00 KBUF 312103 RRA
SVRBUF
NYC037-073-312220-

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GENESEE COUNTY IN WESTERN NEW YORK
  ORLEANS COUNTY IN WESTERN NEW YORK

* UNTIL 620 PM EDT

* AT 5:00 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF STRONG TO SEVERE THUNDERSTORMS STRETCHING FROM WILSON AND
  NIAGARA FALLS TO FORT ERIE...MOVING EAST AT 40 MILES AN HOUR.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LYNDONVILLE...MEDINA AND CORFU BY 5:30 PM EDT
  AND ALBION AND BATAVIA BY 5:45 PM EDT

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


RSH

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, 5:09 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	66 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.