Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 4, NWS Buffalo, NY

April 20, 20156 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 20, 2015, 4:41 PM EDT for 6 counties in New York. It was in force for 49 min. 1 report 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 20, 2015, 4:41 PM EDT (20:41 UTC)
Expired: Apr 20, 2015, 5:30 PM EDT
In force: 49 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Genesee County, NY, Livingston County, NY, Monroe County, NY, Ontario County, NY, Orleans County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 79 km from the middle of the area, began a volume at 20:43 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 20, 5:30 PM EDT	MARINE TSTM WIND 43	Irondequoit, NY

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.7 hours before the alert went out and 77 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: 982 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 429 m²/s²
0-3 km storm-relative helicity: 437 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.

085 
WUUS51 KBUF 202041
SVRBUF
NYC037-051-055-069-073-121-202130-
/O.NEW.KBUF.SV.W.0004.150420T2041Z-150420T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
441 PM EDT MON APR 20 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GENESEE COUNTY IN WESTERN NEW YORK
  NORTHERN LIVINGSTON COUNTY IN WESTERN NEW YORK
  MONROE COUNTY IN WESTERN NEW YORK
  NORTHWESTERN ONTARIO COUNTY IN WESTERN NEW YORK
  SOUTHEASTERN ORLEANS COUNTY IN WESTERN NEW YORK
  NORTHEASTERN WYOMING COUNTY IN WESTERN NEW YORK

THIS ALSO INCLUDES THE NEW YORK THRUWAY BETWEEN EXITS 46 AND 48.

THIS ALSO INCLUDES INTERSTATE 390 BETWEEN EXITS 7 AND 12.

* UNTIL 530 PM EDT

* AT 438 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM BYRON TO 6 MILES WEST OF WARSAW...OR ALONG A LINE EXTENDING
  FROM 5 MILES NORTHEAST OF BATAVIA TO 15 MILES WEST OF LETCHWORTH
  STATE PARK...AND MOVING EAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  PAVILION...
  BROCKPORT...
  CHURCHVILLE...
  SPENCERPORT...
  CHILI...
  GATES-NORTH GATES...
  ROCHESTER...
  HEMLOCK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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!

&&

LAT...LON 4268 7831 4313 7816 4336 7784 4334 7772
      4329 7766 4324 7755 4328 7743 4328 7738
      4273 7751
TIME...MOT...LOC 2041Z 259DEG 31KT 4306 7809 4272 7821

$$

WOOD

2 follow-up statements

870 
WWUS51 KBUF 202116
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
516 PM EDT MON APR 20 2015

NYC037-073-121-202124-
/O.CAN.KBUF.SV.W.0004.000000T0000Z-150420T2130Z/
GENESEE NY-WYOMING NY-ORLEANS NY-
516 PM EDT MON APR 20 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ORLEANS...
NORTHEASTERN WYOMING AND EASTERN GENESEE COUNTIES IS CANCELLED...

LAT...LON 4286 7796 4294 7791 4310 7789 4334 7782
      4334 7772 4329 7766 4324 7755 4328 7743
      4328 7738 4273 7751
TIME...MOT...LOC 2114Z 259DEG 31KT 4311 7771 4277 7783

$$

NYC051-055-069-202130-
/O.CON.KBUF.SV.W.0004.000000T0000Z-150420T2130Z/
LIVINGSTON NY-ONTARIO NY-MONROE NY-
516 PM EDT MON APR 20 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR MONROE...NORTHWESTERN ONTARIO AND NORTHERN LIVINGSTON COUNTIES...

AT 511 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM CHILI TO 8 MILES SOUTH OF YORK...OR ALONG A LINE
EXTENDING FROM CHILI TO GENESEO...MOVING EAST AT 35 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  HILTON...
  BRADDOCK BAY...
  GREECE...
  ROCHESTER INTERNATIONAL AIRPORT...
  ROCHESTER...
  PITTSFORD...

LAT...LON 4286 7796 4294 7791 4310 7789 4334 7782
      4334 7772 4329 7766 4324 7755 4328 7743
      4328 7738 4273 7751
TIME...MOT...LOC 2114Z 259DEG 31KT 4311 7771 4277 7783

$$

JAM

556 
WWUS51 KBUF 202129
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
529 PM EDT MON APR 20 2015

NYC051-055-069-202139-
/O.EXP.KBUF.SV.W.0004.000000T0000Z-150420T2130Z/
LIVINGSTON NY-ONTARIO NY-MONROE NY-
529 PM EDT MON APR 20 2015

...THE SEVERE THUNDERSTORM WARNING FOR MONROE...NORTHWESTERN ONTARIO
AND NORTHERN LIVINGSTON COUNTIES WILL EXPIRE AT 530 PM EDT...

LAT...LON 4286 7796 4294 7791 4310 7789 4334 7782
      4334 7772 4329 7766 4324 7755 4328 7743
      4328 7738 4273 7751
TIME...MOT...LOC 2129Z 259DEG 31KT 4313 7754 4279 7766

$$

JAM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 1:25 PM EDT	Wind Advisory	BUF	Jefferson, Lewis	6 hr
Apr 20, 3:28 PM EDT	Severe Thunderstorm Warning	BUF	Erie	47 min
Apr 20, 4:10 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Monroe, Orleans, Wyoming	50 min
Apr 20, 4:13 PM EDT	Special Weather Statement	BUF	Cattaraugus	47 min
Apr 20, 4:19 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Wyoming	32 min
Apr 20, 4:58 PM EDT	Special Marine Warning	BUF		62 min
Apr 20, 5:30 PM EDT	Special Weather Statement	BUF	Monroe	45 min
Apr 20, 6:55 PM EDT	Special Weather Statement	BUF	Allegany	50 min
Apr 20, 6:58 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	47 min

Nearby

Severe Thunderstorm Warnings in New York, 2015 Every severe thunderstorm warning in 2015

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.