Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS State College, PA

May 1, 2017Elk County, McKean County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 1, 2017, 3:33 PM EDT for Elk County, McKean County, Pennsylvania. It was in force for 87 min. 10 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
May 1, 2017, 3:33 PM EDT (19:33 UTC)
Expired
May 1, 2017, 5:00 PM EDT
In force
87 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Elk County, PA, McKean County, PA

The radar

The State College radar (KCCX), 85 km from the middle of the area, began a volume at 19:34 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
May 1, 4:00 PM EDTTSTM WND DMG2 Ssw James City, PAWIDESPREAD TREES DOWN ALONG ROUTE 66
May 1, 4:03 PM EDTHAIL 1Kane, PAQUARTER SIZE HAIL IN KANE
May 1, 4:05 PM EDTTSTM WND DMG3 Nw Wilcox, PAWIDESPREAD TREE TOPS SNAPPED OFF TWIN LAKES CAMPGROUND
May 1, 4:08 PM EDTTORNADODahoga, PAAN EF1 TORNADO WITH MAXIMUM WINDS OF APPROXIMATELY 110 MPH WAS CONFIRMED BY A NWS SURVEY.
May 1, 4:10 PM EDTTSTM WND DMGWilcox, PAWIDESPREAD TREES DOWN.
May 1, 4:12 PM EDTTSTM WND DMGWilcox, PAWIDESPREAD TREES DOWN IN WILCOX
May 1, 4:19 PM EDTTSTM WND DMG1 E Custer City, PAA MICROBURST AND GUSTNADO WITH MAXIMUM WINDS ESTIMATED NEAR 90 MPH WAS CONFIRMED BY A NWS SURVEY.
May 1, 4:19 PM EDTTORNADO1 E Custer City, PAAN EF1 TORNADO WITH MAXIMUM WINDS ESTIMATED NEAR 90 MPH WAS CONFIRMED BY A NWS SURVEY.
May 1, 4:25 PM EDTFUNNEL CLOUDCrosby, PAFUNNEL CLOUD NEAR CROSBY
May 1, 4:28 PM EDTTSTM WND DMG2 Se Brandy Camp, PAWIDESPREAD TREES DOWN

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.

IssuedProductOfficeLasted
May 1, 2:12 PM EDTTornado WatchSPC8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.6 hours before the alert went out and 156 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 2017-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2017-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 306 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1242 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
306 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

975 
WUUS51 KCTP 011933
SVRCTP
PAC047-083-012100-
/O.NEW.KCTP.SV.W.0021.170501T1933Z-170501T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
333 PM EDT MON MAY 1 2017

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Elk County in north central Pennsylvania...
  McKean County in north central Pennsylvania...

* Until 500 PM EDT

* At 333 PM EDT, severe thunderstorms were located along a line
  extending from near Frewsburg to near New Bethlehem, moving east at
  40 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Bradford, Ridgway, Kane, St. Marys, Johnsonburg, Allegany State
  Park, Force, Crosby, Rew and Ludlow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 1000 PM EDT for central and
north central Pennsylvania.

LAT...LON 4200 7820 4162 7820 4162 7841 4154 7842
      4141 7842 4140 7825 4123 7824 4125 7864
      4122 7865 4120 7871 4126 7873 4137 7897
      4134 7910 4145 7906 4144 7896 4183 7895
      4184 7892 4200 7892
TIME...MOT...LOC 1933Z 262DEG 36KT 4202 7923 4105 7932 

HAIL...<.75IN
WIND...60MPH
 
$$

KF

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 2:26 PM EDTSpecial Weather StatementCTPWarren64 min
May 1, 2:37 PM EDTSevere Thunderstorm WarningCTPWarren68 min
May 1, 3:43 PM EDTSevere Thunderstorm WarningCTPWarren17 min
May 1, 3:48 PM EDTTornado WarningCTPElk27 min
May 1, 3:56 PM EDTSevere Thunderstorm WarningCTPCambria, Clearfield94 min
May 1, 4:06 PM EDTTornado WarningCTPMcKean39 min
May 1, 4:22 PM EDTSevere Thunderstorm WarningCTPCameron, Potter68 min
May 1, 4:35 PM EDTTornado WarningCTPPotter55 min
May 1, 4:52 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton113 min
May 1, 5:01 PM EDTSevere Thunderstorm WarningCTPSomerset29 min
May 1, 5:05 PM EDTAreal Flood AdvisoryCTPMcKean, Warren3 hr
May 1, 5:21 PM EDTSevere Thunderstorm WarningCTPBedford, Blair84 min
May 1, 5:25 PM EDTSevere Thunderstorm WarningCTPPotter, Tioga95 min
May 1, 5:35 PM EDTSevere Thunderstorm WarningCTPCambria, Clearfield, Somerset25 min
May 1, 5:44 PM EDTSevere Thunderstorm WarningCTPLycoming61 min
May 1, 5:50 PM EDTAreal Flood AdvisoryCTPBedford, Blair, Cambria, Centre, Clearfield, Huntingdon and 1 more3 hr
May 1, 5:58 PM EDTAreal Flood AdvisoryCTPClinton, Lycoming, Potter, Tioga3 hr
May 1, 6:06 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon69 min
May 1, 6:31 PM EDTSevere Thunderstorm WarningCTPMifflin59 min
May 1, 6:36 PM EDTSevere Thunderstorm WarningCTPLycoming, Snyder, Union84 min
May 1, 6:44 PM EDTAreal Flood AdvisoryCTPCentre, Clinton, Huntingdon, Juniata, Lycoming, Mifflin and 5 more3 hr
May 1, 6:44 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton46 min
May 1, 6:52 PM EDTSevere Thunderstorm WarningCTPJuniata, Snyder68 min
May 1, 7:05 PM EDTSevere Thunderstorm WarningCTPSullivan55 min
May 1, 7:14 PM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland61 min
May 1, 7:36 PM EDTSpecial Weather StatementCTPJuniata, Mifflin, Snyder54 min
May 1, 7:59 PM EDTSevere Thunderstorm WarningCTPSnyder21 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017Every severe thunderstorm warning in 2017

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.