Alert archive / New York / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 4, NWS Buffalo, NY

April 18, 2004Livingston County, Monroe County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 18, 2004, 11:53 AM EDT for Livingston County, Monroe County, New York. It was in force for 52 min. 4 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, 11:53 AM EDT (15:53 UTC)
Expired: Apr 18, 2004, 12:45 PM EDT
In force: 52 min
Issued by: NWS Buffalo, NY
Area: Counties, with a storm outline in the text

Counties Livingston County, NY, Monroe County, NY

The radar

The Buffalo radar (KBUF), 79 km from the middle of the area, began a volume at 15:53 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
Apr 18, 12:05 PM EDT	HAIL 0.88	Spencerport, NY
Apr 18, 12:15 PM EDT	HAIL 0.75	Caledonia, NY
Apr 18, 12:15 PM EDT	HAIL 0.75	Greece, NY
Apr 18, 12:38 PM EDT	HAIL 0.75	Mount Morris, 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, 3.9 hours before the alert went out and 76 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.

921 
WUUS51 KBUF 181553
SVRBUF
NYC051-055-181645-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1152 AM EDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 1245 PM EDT

* AT 1150 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS WITH A HISTORY OF PRODUCING NICKEL 
  SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 10 MILES NORTHWEST
  OF CHURCHVILLE TO 15 MILES WEST OF MOUNT MORRIS...AND WERE
  MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  SPENCERPORT AND HILTON AND SCOTTSVILLE AT NOON EDT...
  GREECE AND HENRIETTA AND GATES AT 1205 PM EDT...
  ROCHESTER AND IRONDEQUOIT AND CONESUS AT 1210 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT 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 4331 7794 4304 7787 4271 7792 4271 7768
          4298 7756 4323 7752

$$

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, 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, 12:42 PM EDT	Severe Thunderstorm Warning	BUF	Livingston	33 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.