Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 84, NWS Buffalo, NY

August 18, 2009Lewis County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 18, 2009, 5:49 PM EDT for Lewis County, New York. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 18, 2009, 5:49 PM EDT (21:49 UTC)
Expired
Aug 18, 2009, 6:15 PM EDT
In force
26 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

County Lewis County, NY

The radar

The Ft Drum radar (KTYX), 38 km from the middle of the area, began a volume at 21:51 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.8 hours before the alert went out and 179 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, Albany, NY at 12:00Z on 2009-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 213 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, Albany, NY at 12:00Z on 2009-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
213 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
1316 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
72 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 182149
SVRBUF
NYC049-182215-
/O.NEW.KBUF.SV.W.0084.090818T2149Z-090818T2215Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL LEWIS COUNTY IN CENTRAL NEW YORK

* UNTIL 615 PM EDT

* AT 548 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES SOUTH OF INDIAN RIVER...
  OR 2 MILES SOUTHEAST OF CROGHAN...AND MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL LEWIS COUNTY EAST OF CROGHAN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THIS STORM WILL OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4386 7513 4381 7542 4393 7546 4411 7517
TIME...MOT...LOC 2148Z 239DEG 24KT 4389 7536

$$

HITCHCOCK
2 follow-up statements
000 
WWUS51 KBUF 182159
SVSBUF

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

NYC049-182215-
/O.CON.KBUF.SV.W.0084.000000T0000Z-090818T2215Z/
LEWIS NY-
559 PM EDT TUE AUG 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR EAST CENTRAL LEWIS COUNTY...

AT 557 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES EAST OF CROGHAN... 
MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOFT MAPLE RESERVOIR AND LONG POND BY 605 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THIS STORM WILL OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

CAMPERS ALONG THE BEAVER RIVER SHOULD TAKE SHELTER IMMEDIATELY IN A 
BUILDING OR LEAN-TO IF POSSIBLE. MOVE AWAY FROM DEAD AND WEAK TREES.

&&

LAT...LON 4384 7530 4399 7535 4411 7517 4386 7513
TIME...MOT...LOC 2157Z 239DEG 24KT 4393 7524

$$

HITCHCOCK
000 
WWUS51 KBUF 182216
SVSBUF

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

NYC049-182225-
/O.EXP.KBUF.SV.W.0084.000000T0000Z-090818T2215Z/
LEWIS NY-
616 PM EDT TUE AUG 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LEWIS COUNTY HAS
EXPIRED...

AT 615 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.

PLEASE REPORT SEVERE WEATHER DAMAGE TO LOCAL LAW ENFORCEMENT FOR 
RELAY TO THE NATIONAL WEATHER SERVICE IN BUFFALO.

LAT...LON 4384 7530 4399 7535 4411 7517 4386 7513
TIME...MOT...LOC 2159Z 239DEG 24KT 4393 7523

$$

HITCHCOCK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 12:49 PM EDTAreal Flood AdvisoryBUFChautauqua3 hr
Aug 18, 2:19 PM EDTSevere Thunderstorm WarningBUFCattaraugus56 min
Aug 18, 3:18 PM EDTSevere Thunderstorm WarningBUFMonroe, Wayne57 min
Aug 18, 3:54 PM EDTSpecial Marine WarningBUF83 min
Aug 18, 4:54 PM EDTSpecial Marine WarningBUF35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.