Areas of Excessive Rainfall and Severe Thunderstorms; Typhoon Watch for Guam/CNMI

Heavy to excessive rainfall will continue today from the Texas Big Bend region into southern Oklahoma. Locally considerable flash and urban flooding is possible, and river flooding will continue in central Oklahoma. Scattered severe thunderstorms are possible in parts of the Mid-Atlantic Friday. A Typhoon Watch has been issued for Guam and CNMI. Read More >

Overview

Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1123 AM CDT Sat Aug 12 2023

   Valid 121630Z - 131200Z

   ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST
   OHIO INTO THE NORTHERN HALF OF PENNSYLVANIA AND SOUTHERN NEW YORK...

   ...SUMMARY...
   The most concentrated area of severe-thunderstorm threats this
   afternoon extends from northeast Ohio across parts of Pennsylvania
   and into central New York, with damaging to severe wind expected,
   along with large hail and a tornado or two possible.

   ...Southern Great Lakes into the Northeast...
   Water-vapor imagery this morning shows a mid-level shortwave trough
   moving across the northern Great Lakes with a belt of stronger flow
   moving through the southern Great Lakes.  Scattered thunderstorms
   will likely continue to develop through midday into the afternoon
   with the stronger storms becoming capable of a hail/wind threat. 
   Forecast soundings show some low-level hodograph curvature,
   especially with northeast extent from northeast OH into PA and NY. 
   Supercells will likely evolve from the stronger updrafts and pose a
   large to very large hail threat.  It is with the supercells from the
   northern half of PA/northeast OH into southern NY where a tornado
   risk will seemingly focus this afternoon.  As a surface cold front
   pushes east, additional storms are possible along the front and some
   of these will probably have an attendant hail/wind risk before
   weakening this evening.

August 12th 2023 Tornado Watch

Tornado
Wind & Hail
Environment
Additional

Tornadoes

Tornado - 1 N Pleasant Grove
Washington County, PA

Date	8/12/2023
Time (Local)	2015
EF Rating	1
Est. Peak Winds	105 MPH
Path Length	2.4 Miles
Max Width	30 Yards
Injuries/Deaths	0/0
Summary: The National Weather Service in Pittsburgh conducted a storm survey and concluded the damage on Cracraft road was from an EF-1 tornado. The damage was confined to the aforementioned road, where an attached patio roof was taken off along with part of the roof to the main house. Numerous softwood and hardwood trees where uprooted or snapped. The tornado lifted as it approached State Road 221. We would like to thank South Franklin Twp Emergency Coordinator and Washington County Department of Public Safety for their assistance.

Track Map

Track Map EF-Scale


Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen

Tornado - 3 NW Saint Clairsville
Belmont County, OH

Date	8/12/2023
Time (Local)	2013
EF Rating	1
Est. Peak Winds	100 MPH
Path Length	3 Miles
Max Width	20 Yards
Injuries/Deaths	0/0
Summary: An EF-1 tornado started in the Hidden Springs Drive area where at least three homes had trees fall on them. In addition, several hardwood trees were uprooted. The tornado continued east-southeast snapping softwood pines and downing large branches from hardwood trees on Maynard Road. There was a barn destroyed on Maynard Road along with minor damage to soffit. The tornado lifted as it crossed Kagg Hill Road. The National Weather Service would like to thank Belmont County Emergency Management Agency for their assistance.

Track Map

Track Map EF-Scale


Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen	Credit: Bookbinder/McMullen

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Wind & Hail:

Wind

WFO	Report Time	County	Location	State	Event Type	Magnitude
PBZ	8/12 8:57 AM	Washington	3 WNW Fredericktown-Mil	PA	TSTM WND DMG
PBZ	8/12 3:40 PM	Venango	Dempseytown	PA	TSTM WND DMG
PBZ	8/12 3:58 PM	Venango	1 SW Cherrytree	PA	TSTM WND DMG
PBZ	8/12 4:23 PM	Jefferson	1 E Foxburg	PA	TSTM WND DMG
PBZ	8/12 4:30 PM	Tuscarawas	1 WNW Schoenbrunn	OH	TSTM WND DMG
PBZ	8/12 4:42 PM	Tuscarawas	1 NE Dover	OH	TSTM WND DMG
PBZ	8/12 4:45 PM	Tuscarawas	1 W Roswell	OH	TSTM WND DMG
PBZ	8/12 5:02 PM	Carroll	1 SSW Sherrodsville	OH	TSTM WND DMG
PBZ	8/12 5:03 PM	Carroll	1 SW Sherrodsville	OH	TSTM WND DMG
PBZ	8/12 5:04 PM	Carroll	1 NW Leesville	OH	TSTM WND DMG
PBZ	8/12 5:07 PM	Carroll	Leesville	OH	TSTM WND DMG
PBZ	8/12 5:12 PM	Carroll	5 NE Bowerston	OH	TSTM WND DMG
PBZ	8/12 5:24 PM	Harrison	1 SSE Scio	OH	TSTM WND DMG
PBZ	8/12 5:30 PM	Lawrence	3 SW Portersville	PA	TSTM WND DMG
PBZ	8/12 5:40 PM	Mercer	Jackson Center	PA	TSTM WND DMG
PBZ	8/12 5:44 PM	Mercer	Sharon	PA	TSTM WND DMG
PBZ	8/12 6:15 PM	Allegheny	3 W Curtisville	PA	TSTM WND DMG
PBZ	8/12 6:16 PM	Allegheny	1 ENE Bakerstown Statio	PA	TSTM WND DMG
PBZ	8/12 6:42 PM	Allegheny	1 ENE Bairdford	PA	TSTM WND DMG
PBZ	8/12 6:50 PM	Tuscarawas	Sugarcreek	OH	TSTM WND DMG
PBZ	8/12 6:52 PM	Washington	1 WNW Hickory	PA	TSTM WND DMG
PBZ	8/12 6:56 PM	Westmoreland	1 ESE North Washington	PA	TSTM WND DMG
PBZ	8/12 6:57 PM	Tuscarawas	4 ESE Sugarcreek	OH	TSTM WND DMG
PBZ	8/12 6:59 PM	Armstrong	Brownstown	PA	TSTM WND DMG
PBZ	8/12 7:00 PM	Westmoreland	1 E North Washington	PA	TSTM WND DMG
PBZ	8/12 7:01 PM	Westmoreland	1 SSE Salina	PA	TSTM WND DMG
PBZ	8/12 7:03 PM	Tuscarawas	2 S Stone Creek	OH	TSTM WND DMG
PBZ	8/12 7:04 PM	Tuscarawas	1 S Stone Creek	OH	TSTM WND DMG
PBZ	8/12 7:05 PM	Tuscarawas	2 SE Stone Creek	OH	TSTM WND DMG
PBZ	8/12 7:05 PM	Tuscarawas	3 NE Stone Creek	OH	TSTM WND DMG
PBZ	8/12 7:09 PM	Tuscarawas	1 S South Side	OH	TSTM WND DMG
PBZ	8/12 7:10 PM	Tuscarawas	2 E Port Washington	OH	TSTM WND DMG
PBZ	8/12 7:41 PM	Brooke	Bethany	WV	TSTM WND DMG
PBZ	8/12 7:46 PM	Indiana	1 N Boltz	PA	TSTM WND DMG
PBZ	8/12 7:58 PM	Washington	2 WNW Rural Valley	PA	TSTM WND DMG
PBZ	8/12 8:01 PM	Belmont	Stewartsville	OH	TSTM WND DMG
PBZ	8/12 8:03 PM	Belmont	1 NW Highland Terrace	OH	TSTM WND DMG
PBZ	8/12 8:03 PM	Belmont	Fairpoint	OH	TSTM WND DMG
PBZ	8/12 8:06 PM	Belmont	Highland Terrace	OH	TSTM WND DMG
PBZ	8/12 8:06 PM	Belmont	St. Clairsville	OH	TSTM WND DMG
PBZ	8/12 8:10 PM	Belmont	1 NNE Claremont	OH	TSTM WND DMG
PBZ	8/12 8:11 PM	Noble	2 WNW Middleburg	OH	TSTM WND DMG
PBZ	8/12 8:32 PM	Allegheny	2 NW Sturgeon	PA	TSTM WND DMG
PBZ	8/12 8:34 PM	Indiana	1 N Manor	PA	TSTM WND DMG
PBZ	8/12 8:35 PM	Washington	1 WSW Lone Pine	PA	TSTM WND DMG
PBZ	8/12 8:40 PM	Westmoreland	Mount Pleasant	PA	TSTM WND DMG
PBZ	8/12 8:40 PM	Washington	2 NE Amity	PA	TSTM WND DMG
PBZ	8/12 8:48 PM	Washington	6 WSW Ellsworth	PA	TSTM WND DMG
PBZ	8/12 8:52 PM	Greene	Wind Ridge	PA	TSTM WND DMG
PBZ	8/12 8:57 PM	Wetzel	Pine Grove	WV	TSTM WND DMG
PBZ	8/12 8:59 PM	Wetzel	Reader	WV	TSTM WND DMG
PBZ	8/12 9:00 PM	Washington	Deemston	PA	TSTM WND DMG
PBZ	8/12 9:03 PM	Washington	2 WNW Fredericktown-Mil	PA	TSTM WND DMG
PBZ	8/12 9:03 PM	Washington	1 NNW Sandy Plains	PA	TSTM WND DMG
PBZ	8/12 9:04 PM	Washington	1 NNW Fredericktown-Mil	PA	TSTM WND DMG
PBZ	8/12 9:10 PM	Greene	Rices Landing	PA	TSTM WND DMG
PBZ	8/12 9:14 PM	Monongalia	Blacksville	WV	TSTM WND DMG
PBZ	8/12 9:16 PM	Greene	Carmichaels	PA	TSTM WND DMG
PBZ	8/12 9:21 PM	Fayette	Church Hill	PA	TSTM WND DMG
PBZ	8/12 9:24 PM	Fayette	3 WNW Leith-Hatfield	PA	TSTM WND DMG
PBZ	8/12 9:26 PM	Fayette	Continental Number 2	PA	TSTM WND DMG
PBZ	8/12 9:26 PM	Greene	Greensboro	PA	TSTM WND DMG
PBZ	8/12 9:28 PM	Fayette	Uniontown	PA	TSTM WND DMG
PBZ	8/12 9:28 PM	Fayette	1 ENE Smithfield	PA	TSTM WND DMG
PBZ	8/12 9:28 PM	Fayette	Hatfield	PA	TSTM WND DMG
PBZ	8/12 9:28 PM	Monongalia	Cassville	WV	TSTM WND DMG
PBZ	8/12 9:30 PM	Fayette	Fairchance	PA	TSTM WND DMG
PBZ	8/12 9:30 PM	Monongalia	Daybrook	WV	TSTM WND DMG
PBZ	8/12 9:32 PM	Greene	Dilliner	PA	TSTM WND DMG
PBZ	8/12 9:37 PM	Monongalia	Morgantown	WV	TSTM WND DMG
PBZ	8/12 9:37 PM	Marion	1 SE Festus	WV	TSTM WND DMG
PBZ	8/12 9:40 PM	Marion	1 SSE Everson	WV	TSTM WND DMG
PBZ	8/12 9:41 PM	Marion	Norway	WV	TSTM WND DMG
PBZ	8/12 9:44 PM	Monongalia	1 E Little Falls	WV	TSTM WND DMG
PBZ	8/12 10:10 PM	Preston	Kingwood	WV	TSTM WND DMG
PBZ	8/12 10:14 PM	Preston	Newburg	WV	TSTM WND DMG
PBZ	8/12 10:23 PM	Preston	Rowlesburg	WV	TSTM WND DMG

Wind Damage in Claysville, PA

Credit: Nick Wilkes

Wind Damage in Claysville, PA

Credit: Nick Wilkes

Wind Damage in Fairpoint, OH

Credit: Nelson Tucker

Wind Damage in Fairpoint, OH

Credit: Nelson Tucker

Hail

WFO	Report Time	County	Location	State	Event Type	Magnitude
PBZ	8/12 3:46 PM	Venango	5 E Cooperstown	PA	HAIL	1
PBZ	8/12 3:48 PM	Venango	Kaneville	PA	HAIL	1
PBZ	8/12 4:01 PM	Venango	2 NNW Rouseville	PA	HAIL	1
PBZ	8/12 4:28 PM	Tuscarawas	1 W Dover	OH	HAIL	1
PBZ	8/12 4:58 PM	Carroll	Sherrodsville	OH	HAIL	1.75
PBZ	8/12 5:05 PM	Carroll	1 SE Hazelton	OH	HAIL	1.25
PBZ	8/12 5:50 PM	Jefferson	2 W Brentwood	OH	HAIL	1
PBZ	8/12 6:33 PM	Allegheny	Springdale	PA	HAIL	1
PBZ	8/12 6:45 PM	Westmoreland	1 NW Alcoa Center	PA	HAIL	1.25
PBZ	8/12 6:48 PM	Westmoreland	3 W North Washington	PA	HAIL	1.25
PBZ	8/12 6:48 PM	Washington	3 NW Hickory	PA	HAIL	1
PBZ	8/12 6:55 PM	Westmoreland	1 NW North Washington	PA	HAIL	1
PBZ	8/12 6:55 PM	Westmoreland	1 E North Washington	PA	HAIL	1
PBZ	8/12 6:56 PM	Westmoreland	1 ESE North Washington	PA	HAIL	1
PBZ	8/12 7:01 PM	Westmoreland	1 W Salina	PA	HAIL	0.88
PBZ	8/12 7:41 PM	Brooke	1 SW Bethany	WV	HAIL	1.75
PBZ	8/12 8:00 PM	Washington	3 NW Claysville	PA	HAIL	1.25
PBZ	8/12 8:08 PM	Washington	1 N Claysville	PA	HAIL	2.5
PBZ	8/12 8:08 PM	Washington	1 SSE Taylorstown	PA	HAIL	2
PBZ	8/12 8:10 PM	Washington	1 N Washington	PA	HAIL	0.75
PBZ	8/12 8:12 PM	Washington	2 ESE Claysville	PA	HAIL	2
PBZ	8/12 8:14 PM	Washington	2 ESE Claysville	PA	HAIL	3
PBZ	8/12 8:15 PM	Washington	1 WNW Green Hills	PA	HAIL	1.25
PBZ	8/12 8:18 PM	Washington	1 NNE Lagonda	PA	HAIL	1.75

Large Hail in Claysville, PA

Credit: Lance

Large Hail in Linden, PA

Credit: NWS Pittsburgh

Environment

SPC Upper Air Maps 12Z


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700MB	850MB	925MB

SPC Upper Air Maps 00Z


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700MB	850MB	925MB

WPC Surface Analysis.


Figure 4: Caption	Figure 5: Caption	Figure 6: Caption


Figure 1: Caption	Figure 2: Caption	Figure 3: Caption

Pittsburgh Soundings from Aug 12th 2023.


August 12th 2023 12Z	August 12th 2023 18Z	August 13th 2023 00Z

Additional Information

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SPC Day 3 Categorical Outlook	SPC Day 3 Probabilistic Outlook	SPC Day 2 Categorical Outlook	SPC Day 2 Probabilistic Outlook

SPC Day 1 Categorical Outlook	SPC Day 1 Tornado Outlook	SPC Day 1 Hail Outlook	SPC Day 1 Wind Outlook