Alert archive / New York / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 7, NWS Buffalo, NY

April 18, 2004Livingston County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 18, 2004, 12:42 PM EDT for Livingston County, New York. It was in force for 33 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 18, 2004, 12:42 PM EDT (16:42 UTC)
Expired: Apr 18, 2004, 1:15 PM EDT
In force: 33 min
Issued by: NWS Buffalo, NY
Area: Counties, with a storm outline in the text

County Livingston County, NY

The radar

The Buffalo radar (KBUF), 87 km from the middle of the area, began a volume at 16:43 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
Apr 18, 12:48 PM EDT	HAIL 1.75	Dansville, NY
Apr 18, 12:55 PM EDT	HAIL 0.75	Dansville, NY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 18, 11:45 AM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 4.7 hours before the alert went out and 84 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: 1052 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 151 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.

194 
WUUS51 KBUF 181642
SVRBUF
NYC051-181715-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1242 PM EDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LIVINGSTON COUNTY IN WESTERN NEW YORK

* UNTIL 115 PM EDT

* AT 1240 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS WITH A HISTORY OF PRODUCING NICKEL
  SIZED HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM HEMLOCK TO 5 MILES
  SOUTHWEST OF GROVELAND...AND WERE MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORMS WILL AFFECT SOUTHERN LIVINGSTON COUNTY.

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN BUFFALO.

LAT...LON 4287 7766 4255 7790 4256 7768 4286 7761

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 10:24 AM EDT	Special Marine Warning	BUF		51 min
Apr 18, 10:24 AM EDT	Special Marine Warning	BUF		51 min
Apr 18, 10:24 AM EDT	Special Marine Warning	BUF		51 min
Apr 18, 10:24 AM EDT	Special Marine Warning	BUF		51 min
Apr 18, 10:42 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	48 min
Apr 18, 11:14 AM EDT	Severe Thunderstorm Warning	BUF	Genesee, Orleans	61 min
Apr 18, 11:15 AM EDT	Special Marine Warning	BUF		60 min
Apr 18, 11:30 AM EDT	Severe Thunderstorm Warning	BUF	Wyoming	60 min
Apr 18, 11:53 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe	52 min
Apr 18, 12:15 PM EDT	Special Marine Warning	BUF		60 min
Apr 18, 12:19 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	56 min
Apr 18, 12:34 PM EDT	Severe Thunderstorm Warning	BUF	Wayne	56 min
Apr 18, 1:03 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	42 min
Apr 18, 1:15 PM EDT	Special Marine Warning	BUF		60 min

Nearby

Severe Thunderstorm Warnings in New York, 2004 Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.