Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 340

June 23, 20155 counties in New York; 17 counties in Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2015, 6:08 AM EDT for 5 counties in New York; 17 counties in Pennsylvania. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jun 23, 2015, 6:08 AM EDT (10:08 UTC)
Expired
Jun 23, 2015, 10:20 AM EDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 22 counties

Chemung County, NY, Schuyler County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Bradford County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Juniata County, PA, Lycoming County, PA, McKean County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Potter County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA

The radar

The Buffalo radar (KBUF), 132 km from the middle of the area, began a volume at 10:07 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 23, 6:10 AM EDTSevere Thunderstorm WarningBGMSchuyler, Steuben, Yates65 min
Jun 23, 6:18 AM EDTSevere Thunderstorm WarningCTPCameron, Clearfield, Elk57 min
Jun 23, 6:36 AM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Potter, Tioga54 min
Jun 23, 7:14 AM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Clinton, Lycoming, Tioga, Union76 min
Jun 23, 8:02 AM EDTSevere Thunderstorm WarningCTPClearfield58 min
Jun 23, 8:48 AM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Huntingdon57 min
Jun 23, 9:13 AM EDTSevere Thunderstorm WarningCTPCentre, Huntingdon, Mifflin34 min
Jun 23, 9:37 AM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Columbia, Mifflin, Montour, Northumberland and 2 more53 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 10.1 hours before the alert went out and 128 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 2015-06-23Temperature 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 00:00Z on 2015-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 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
2108 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
298 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 23, 4:24 AM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Chenango and 21 more66 min
Jun 23, 5:30 AM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Chautauqua, Steuben, Yates60 min
Jun 23, 8:39 AM EDTMesoscale DiscussionSPCBroome, Chenango, Delaware, Sullivan96 min
Jun 23, 8:57 AM EDTMesoscale DiscussionSPCColumbia, Dutchess, Greene, Orange, Putnam, Rockland and 2 more63 min
Jun 23, 10:12 AM EDTSevere Thunderstorm WatchSPCBronx, Columbia, Dutchess, Greene, Kings, Nassau and 10 more6 hr
Jun 23, 2:46 PM EDTMesoscale DiscussionSPCAlbany, Columbia, Delaware, Dutchess, Essex, Fulton and 18 more89 min
Jun 23, 3:35 PM EDTSevere Thunderstorm WatchSPCAlbany, Bronx, Columbia, Dutchess, Fulton, Greene and 18 more6 hr
Jun 23, 5:47 PM EDTMesoscale DiscussionSPCKings, Richmond88 min
Jun 23, 7:41 PM EDTMesoscale DiscussionSPCKings, Richmond94 min
Jun 23, 3:30 AM EDTSevere Thunderstorm WatchSPCCrawford, Erie3 hr
Jun 23, 10:20 AM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bucks, Cambria and 30 more7 hr
Jun 23, 10:28 AM EDTMesoscale DiscussionSPCAllegheny, Beaver, Fayette, Greene, Somerset, Washington and 1 more2 hr
Jun 23, 1:17 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more7 hr
Jun 23, 3:25 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bucks, Cambria and 21 more95 min
Jun 23, 4:09 PM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more7 hr

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2015Severe Thunderstorm Watches in New York, 2015Every severe thunderstorm watch in 2015

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.