Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 77, NWS Buffalo, NY

August 18, 2011Niagara County, Orleans County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 18, 2011, 3:46 PM EDT for Niagara County, Orleans County, New York. It was in force for 44 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
Aug 18, 2011, 3:46 PM EDT (19:46 UTC)
Expired
Aug 18, 2011, 4:30 PM EDT
In force
44 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Niagara County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 40 km from the middle of the area, began a volume at 19:49 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

TimeReportWhereRemark
Aug 18, 3:55 PM EDTTSTM WND DMG1 Ne Gasport, NYTREE DOWN ACROSS ROAD

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, 7.8 hours before the alert went out and 41 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2011-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2011-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
20 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
1362 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
106 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.

794 
WUUS51 KBUF 181946
SVRBUF
NYC063-073-182030-
/O.NEW.KBUF.SV.W.0077.110818T1946Z-110818T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
346 PM EDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 430 PM EDT

* AT 344 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  NEWFANE...OR 6 MILES NORTH OF LOCKPORT...AND MOVING EAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  HARTLAND...
  WRIGHTS CORNERS...
  MIDDLEPORT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4335 7834 4316 7834 4320 7880 4330 7877
TIME...MOT...LOC 1946Z 271DEG 13KT 4325 7870

$$

HITCHCOCK
2 follow-up statements
804 
WWUS51 KBUF 182009
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
409 PM EDT THU AUG 18 2011

NYC063-073-182030-
/O.CON.KBUF.SV.W.0077.000000T0000Z-110818T2030Z/
NIAGARA NY-ORLEANS NY-
409 PM EDT THU AUG 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR WESTERN ORLEANS AND EASTERN NIAGARA COUNTIES...

AT 407 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR GASPORT...OR 8 MILES NORTHEAST OF LOCKPORT...MOVING EAST
AT 15 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  MIDDLEPORT...
  HARTLAND...
  RIDGEWAY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4335 7834 4316 7834 4320 7880 4330 7877
TIME...MOT...LOC 2008Z 271DEG 13KT 4326 7859

$$

HITCHCOCK
906 
WWUS51 KBUF 182034
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
434 PM EDT THU AUG 18 2011

NYC063-073-182044-
/O.EXP.KBUF.SV.W.0077.000000T0000Z-110818T2030Z/
NIAGARA NY-ORLEANS NY-
434 PM EDT THU AUG 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ORLEANS AND CENTRAL
NIAGARA COUNTIES HAS EXPIRED...

AT 434 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER
SEVERE...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

ADDITIONAL THUNDERSTORMS MAY CONTINUE TO PRODUCE SMALL HAIL AND 
GUSTY WINDS ALONG WITH HEAVY RAINFALL...BUT THESE STORMS ARE NOT 
SEVERE AT THIS TIME.

LAT...LON 4335 7834 4316 7834 4320 7880 4330 7877
TIME...MOT...LOC 2009Z 271DEG 13KT 4326 7858

$$

HITCHCOCK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 1:20 PM EDTSpecial Weather StatementBUFOrleans55 min
Aug 18, 1:35 PM EDTAreal Flood AdvisoryBUFMonroe, Niagara, Orleans3 hr
Aug 18, 2:45 PM EDTSpecial Weather StatementBUFOrleans60 min
Aug 18, 3:29 PM EDTSpecial Weather StatementBUFWayne61 min
Aug 18, 3:43 PM EDTSpecial Weather StatementBUFNiagara62 min
Aug 18, 4:12 PM EDTSpecial Weather StatementBUFOswego63 min
Aug 18, 6:08 PM EDTSpecial Marine WarningBUF59 min

Nearby

Severe Thunderstorm Warnings in New York, 2011Every severe thunderstorm warning in 2011

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.