Alert archive / New York / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 86, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Aug 20, 2009, 7:56 PM EDT for Erie County, Niagara County, New York. It was in force for 79 min. 3 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
- Aug 20, 2009, 7:56 PM EDT (23:56 UTC)
- Expired
- Aug 20, 2009, 9:15 PM EDT
- In force
- 79 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
Counties Erie County, NY, Niagara County, NY
The radar
The Buffalo radar (KBUF), 13 km from the middle of the area, began a volume at 23:58 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 20, 8:25 PM EDT | TSTM WND DMG | North Tonawanda, NY | NUMEROUS TREES DOWN |
| Aug 20, 8:27 PM EDT | TSTM WND GST 65 | Buffalo, NY | BUFFALO CHARTER SCHOOL OF APPLIED TECHNOLOGY |
| Aug 20, 8:28 PM EDT | TSTM WND DMG | 2 Ne North Tonawanda, NY | NUMEROUS TREES DOWN IN WHEATFIELD |
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 |
|---|---|---|---|
| Aug 20, 6:54 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.9 hours before the alert went out and 16 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.
- Mixed-layer CAPE
- 1149 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 810 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KBUF 202356
SVRBUF
NYC029-063-210115-
/O.NEW.KBUF.SV.W.0086.090820T2356Z-090821T0115Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
756 PM EDT THU AUG 20 2009
THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
ERIE COUNTY IN WESTERN NEW YORK
NIAGARA COUNTY IN WESTERN NEW YORK
* UNTIL 915 PM EDT
* AT 753 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 11 MILES WEST OF GRAND ISLAND TO 20 MILES WEST OF
LAKE ERIE BEACH...OR ALONG A LINE EXTENDING FROM 9 MILES NORTHEAST
OF PORT COLBORNE TO 7 MILES NORTHWEST OF DUNKIRK...AND MOVING
NORTHEAST AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
NIAGARA FALLS AND LEWISTON BY 810 PM EDT...
YOUNGSTOWN AND GRAND ISLAND BY 815 PM EDT...
SANBORN AND LAKE ERIE BEACH BY 820 PM EDT...
BUFFALO AND TONAWANDA BY 825 PM EDT...
NORTH COLLINS BY 825 PM EDT...
PENDLETON BY 830 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM EDT FRIDAY
MORNING FOR WESTERN NEW YORK.
&&
LAT...LON 4270 7905 4275 7892 4279 7887 4295 7893
4297 7902 4301 7904 4307 7899 4309 7908
4314 7905 4326 7907 4335 7871 4338 7846
4288 7846 4287 7848 4270 7846 4255 7908
4257 7913 4259 7915
TIME...MOT...LOC 2354Z 240DEG 38KT 4299 7917 4255 7945
$$
ZAFF3 follow-up statements
000
WWUS51 KBUF 210032
SVSBUF
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
832 PM EDT THU AUG 20 2009
NYC029-063-210115-
/O.CON.KBUF.SV.W.0086.000000T0000Z-090821T0115Z/
NIAGARA NY-ERIE NY-
832 PM EDT THU AUG 20 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR ERIE AND NIAGARA COUNTIES...
AT 828 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM RANSOMVILLE TO PENDLETON TO
BUFFALO...MOVING NORTHEAST AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
WEST SENECA BY 835 PM EDT...
WILSON BY 840 PM EDT...
WALES CENTER BY 845 PM EDT...
OLCOTT BY 850 PM EDT...
MIDDLEPORT BY 855 PM EDT...
THIRTY MILE POINT BY 900 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A PARTICULARLY DANGEROUS SITUATION MOVE INTO A STRONG
SHELTER AND REMAIN INDOORS IN THE LOWEST FLOOR OF YOUR HOME. STAY
AWAY FROM WINDOWS AND EXTERIOR WALLS IF POSSIBLE.
THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4270 7905 4275 7892 4279 7887 4295 7893
4297 7901 4301 7904 4307 7899 4309 7908
4314 7905 4326 7907 4335 7871 4338 7846
4288 7846 4284 7848 4270 7846 4255 7908
4257 7913 4259 7915
TIME...MOT...LOC 0030Z 238DEG 39KT 4321 7892 4309 7877
4291 7887
$$
HITCHCOCK000
WWUS51 KBUF 210051
SVSBUF
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
851 PM EDT THU AUG 20 2009
NYC029-063-210115-
/O.CON.KBUF.SV.W.0086.000000T0000Z-090821T0115Z/
NIAGARA NY-ERIE NY-
851 PM EDT THU AUG 20 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR ERIE AND NIAGARA COUNTIES...
AT 848 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM OLCOTT TO GASPORT TO SLOAN...MOVING
NORTHEAST AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
MIDDLEPORT BY 855 PM EDT...
BUFFALO AND AMHERST BY 855 PM EDT...
CLARENCE AND LANCASTER BY 905 PM EDT...
AKRON BY 915 PM EDT...
ANOTHER LINE OF SEVERE THUNDERSTORMS NEAR SILVER CREEK WILL MOVE
INTO SOUTHWEST ERIE COUNTY AND IMPACT AREAS FROM BRANT TO EDEN AND
ANGOLA THROUGH 910 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM EDT FRIDAY
MORNING FOR WESTERN NEW YORK.
&&
LAT...LON 4270 7905 4275 7892 4279 7887 4295 7893
4297 7901 4301 7904 4307 7899 4309 7908
4314 7905 4326 7907 4335 7871 4338 7846
4288 7846 4284 7848 4270 7846 4255 7908
4257 7913 4259 7915
TIME...MOT...LOC 0049Z 237DEG 40KT 4334 7867 4322 7852
4288 7881
$$
HITCHCOCK000
WWUS51 KBUF 210115 RRA
SVSBUF
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
915 PM EDT THU AUG 20 2009
NYC029-063-210125-
/O.EXP.KBUF.SV.W.0086.000000T0000Z-090821T0115Z/
NIAGARA NY-ERIE NY-
915 PM EDT THU AUG 20 2009
...THE SEVERE THUNDERSTORM WARNING FOR ERIE AND NIAGARA COUNTIES HAS
EXPIRED...
AT 915 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD EXITED THE WARNED AREA...
THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT FOR WESTERN NEW YORK.
LAT...LON 4270 7905 4275 7892 4279 7887 4295 7893
4297 7901 4301 7904 4307 7899 4309 7908
4314 7905 4326 7907 4335 7871 4338 7846
4288 7846 4284 7848 4270 7846 4255 7908
4257 7913 4259 7915
TIME...MOT...LOC 0051Z 237DEG 40KT 4335 7864 4323 7849
4289 7878
$$
HITCHCOCKThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 6:31 PM EDT | Special Marine Warning | BUF | 119 min | |
| Aug 20, 7:15 PM EDT | Special Marine Warning | BUF | 2 hr | |
| Aug 20, 7:47 PM EDT | Severe Thunderstorm Warning | BUF | Chautauqua | 73 min |
Nearby
Severe Thunderstorm Warnings in New York, 2009Every 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.