Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 261, NWS Cleveland, OH

August 21, 2011Crawford County, Erie County, Pennsylvania

NWS Cleveland, OH issued this severe thunderstorm warning at Aug 21, 2011, 2:17 AM EDT for Crawford County, Erie County, Pennsylvania. It was in force for 58 min. 2 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 21, 2011, 2:17 AM EDT (06:17 UTC)
Expired
Aug 21, 2011, 3:15 AM EDT
In force
58 min
Issued by
NWS Cleveland, OH
Area
Storm-based polygon

Counties Crawford County, PA, Erie County, PA

The radar

The Buffalo radar (KBUF), 142 km from the middle of the area, began a volume at 06:19 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 21, 2:28 AM EDTHAIL 0.88Mckean, PA
Aug 21, 2:35 AM EDTHAIL 16 S Erie, PA

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 00:00Z, 6.3 hours before the alert went out and 143 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 00:00Z on 2011-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 367 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 00:00Z on 2011-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.193958Sfc1 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
367 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1554 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
82 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.

864 
WUUS51 KCLE 210617
SVRCLE
PAC039-049-210715-
/O.NEW.KCLE.SV.W.0261.110821T0617Z-110821T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CLEVELAND OH
217 AM EDT SUN AUG 21 2011

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CRAWFORD COUNTY IN NORTHWEST PENNSYLVANIA
  ERIE COUNTY IN NORTHWEST PENNSYLVANIA

* UNTIL 315 AM EDT

* AT 213 AM 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 6 MILES
  SOUTHEAST OF GIRARD...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ERIE...
  CAMBRIDGE SPRINGS...
  WATERFORD...
  UNION CITY...
  NORTH EAST...
  SPARTANSBURG...
  CORRY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. SEEK SHELTER INSIDE NOW AND STAY AWAY FROM
WINDOWS.

&&

PLEASE REPORT HAIL AND STRONG WINDS TO THE NATIONAL WEATHER SERVICE
BY CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 4227 7975 4201 7975 4199 7960 4181 7961
      4177 8051 4199 8050 4206 8028 4210 8019
      4213 8016 4213 8013 4216 8007 4216 8004
      4228 7977
TIME...MOT...LOC 0617Z 253DEG 24KT 4197 8019

$$

KIELTYKA
2 follow-up statements
536 
WWUS51 KCLE 210643
SVSCLE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
243 AM EDT SUN AUG 21 2011

PAC039-049-210715-
/O.CON.KCLE.SV.W.0261.000000T0000Z-110821T0715Z/
CRAWFORD PA-ERIE PA-
243 AM EDT SUN AUG 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM EDT
FOR ERIE AND NORTHEASTERN CRAWFORD COUNTIES IN NORTHWEST
PENNSYLVANIA...

AT 239 AM EDT...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 WATERFORD...OR 9 MILES 
SOUTHEAST OF ERIE...MOVING EAST AT 30 MPH.

LOCATIONS NEAR THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...RURAL
EASTERN ERIE COUNTY.

NICKEL SIZE HAIL WAS REPORTED IN ALBION AND MCKEAN.

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 4227 7975 4201 7975 4199 7960 4181 7961
      4178 8034 4207 8025 4206 8028 4210 8019
      4213 8016 4213 8013 4216 8007 4216 8004
      4228 7977
TIME...MOT...LOC 0641Z 253DEG 24KT 4201 7998

$$

KIELTYKA
644 
WWUS51 KCLE 210715
SVSCLE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
315 AM EDT SUN AUG 21 2011

PAC039-049-210725-
/O.EXP.KCLE.SV.W.0261.000000T0000Z-110821T0715Z/
CRAWFORD PA-ERIE PA-
315 AM EDT SUN AUG 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR ERIE AND NORTHEASTERN CRAWFORD
COUNTIES IN NORTHWEST PENNSYLVANIA EXPIRES AT 315 AM EDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND NO LONGER
APPEARED TO BE SEVERE...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4227 7975 4201 7975 4199 7960 4181 7961
      4178 8034 4207 8025 4206 8028 4210 8019
      4213 8016 4213 8013 4216 8007 4216 8004
      4228 7977
TIME...MOT...LOC 0715Z 253DEG 24KT 4207 7969

$$

KIELTYKA

The office that day

Everything else NWS Cleveland, OH issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 21, 3:45 AM EDTAreal Flood AdvisoryCLEErie4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.