Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 82, NWS Buffalo, NY

August 18, 2009Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 18, 2009, 2:19 PM EDT for Cattaraugus County, New York. It was in force for 56 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, 2009, 2:19 PM EDT (18:19 UTC)
Expired: Aug 18, 2009, 3:15 PM EDT
In force: 56 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 77 km from the middle of the area, began a volume at 18:21 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
Aug 18, 3:02 PM EDT	TSTM WND DMG	Ischua, NY	TREES AND POWER LINES DOWN

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, 6.3 hours before the alert went out and 75 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: 870 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 118 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.

000 
WUUS51 KBUF 181819
SVRBUF
NYC009-181915-
/O.NEW.KBUF.SV.W.0082.090818T1819Z-090818T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
219 PM EDT TUE AUG 18 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 315 PM EDT

* AT 218 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
  WEST OF SALAMANCA...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ASHFORD BY 305 PM EDT...
  FRANKLINVILLE BY 315 PM EDT...

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 4220 7907 4225 7906 4252 7840 4235 7830
      4218 7830 4207 7899
TIME...MOT...LOC 1819Z 256DEG 18KT 4222 7888

$$

ZAFF

2 follow-up statements

000 
WWUS51 KBUF 181847
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
247 PM EDT TUE AUG 18 2009

NYC009-181915-
/O.CON.KBUF.SV.W.0082.000000T0000Z-090818T1915Z/
CATTARAUGUS NY-
247 PM EDT TUE AUG 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT 
FOR CATTARAUGUS COUNTY...

AT 245 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR ELLICOTTVILLE...MOVING EAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ASHFORD BY 305 PM EDT...
  FRANKLINVILLE BY 315 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS SHOWN SOME WEAK ROTATION ON DOPPLER RADAR. WHILE NOT 
IMMINENT...SEVERE THUNDERSTORMS CAN AND DO PRODUCE TORNADOES.

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 4233 7875 4252 7840 4235 7830 4218 7830
      4214 7872
TIME...MOT...LOC 1846Z 256DEG 18KT 4225 7870

$$

HITCHCOCK

000 
WWUS51 KBUF 181913
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
313 PM EDT TUE AUG 18 2009

NYC009-181922-
/O.EXP.KBUF.SV.W.0082.000000T0000Z-090818T1915Z/
CATTARAUGUS NY-
313 PM EDT TUE AUG 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CATTARAUGUS COUNTY 
WILL EXPIRE AT 315 PM EDT...

RADAR INDICATED THAT HEAVY RAIN AND GUSTY WINDS WERE STILL POSSIBLE 
FROM THE THUNDERSTORM.

LAT...LON 4233 7875 4252 7840 4235 7830 4218 7830
      4214 7872
TIME...MOT...LOC 1912Z 256DEG 18KT 4228 7852

$$

ZAFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 12:49 PM EDT	Areal Flood Advisory	BUF	Chautauqua	3 hr
Aug 18, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	57 min
Aug 18, 3:54 PM EDT	Special Marine Warning	BUF		83 min
Aug 18, 4:54 PM EDT	Special Marine Warning	BUF		35 min
Aug 18, 5:49 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	26 min

Nearby

Severe Thunderstorm Warnings in New York, 2009 Every severe thunderstorm warning in 2009

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.