Alert archive / Pennsylvania / Special Weather Statements in 2017
Special Weather Statement, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this special weather statement at Aug 4, 2017, 8:46 PM EDT for Jefferson County, Pennsylvania. It was in force for 44 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 4, 2017, 8:46 PM EDT (00:46 UTC)
- Expired
- Aug 4, 2017, 9:30 PM EDT
- In force
- 44 min
- Issued by
- NWS Pittsburgh, PA
County Jefferson County, PA
The radar
The State College radar (KCCX), 75 km from the middle of the area, began a volume at 00:46 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.8 hours before the alert went out and 269 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.
- Mixed-layer CAPE
- 786 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1447 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.7
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before this special weather statement went out at Aug 4, 5:30 PM EDT, 3 hours 16 minutes earlier.
Area forecast discussion, Aug 4, 5:30 PM EDT, 3 hours 16 minutes before
Area Forecast Discussion National Weather Service Pittsburgh PA 530 PM EDT Fri Aug 4 2017 .SYNOPSIS... A crossing cold front will end the thunderstorm threat this evening. && .NEAR TERM /THROUGH SATURDAY/... A series of updates is forthcoming which will end the severe thunderstorm watch from the west upon passage of the cold front. The severe threat will continue in advance of the boundary though given the increasing shear associated with the encroacing upper trough axis. Improvement thereafter will be rapid as the temperature and dewpoint drops under the aforementioned trough. Residual showers are possible along/north of I 80 on Saturday morning as upper boundary layer cold advection briefly steepens low level lapse rates. Otherwise, expect Saturday highs about 10 degrees under the averages. && .SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY/... Surface high pressure will move over the Ohio Valley Saturday night into Sunday, keeping conditions dry. Some locations may not make it out of the 60s on Saturday, but light southerly winds should support a rebound back into the 70s on Sunday. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Front is projected to stall south of our region then return as a warm front Sunday night into Monday. This will spread a good slug of showers across the area during that time frame. Otherwise, overall upper troughing will maintain sub-average, albeit slowly moderating temperature until mid week. && .AVIATION /21Z FRIDAY THROUGH WEDNESDAY/... Passage of this eves cold front will return general VFR to regional terminals, although cold advection is expected to support a brief period of MVFR stratocu on Saturday morning. .OUTLOOK... Restrictions are likely again with Monday low pressure. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && 15
Hazardous weather outlook, Aug 4, 3:09 AM EDT, 17 hours 37 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 309 AM EDT Fri Aug 4 2017 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-050715- Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana- Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette- Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 309 AM EDT Fri Aug 4 2017 This Hazardous Weather Outlook is for western Maryland, east central Ohio, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania, western Pennsylvania, northern West Virginia and northern panhandle of West Virginia. .DAY ONE...Today and Tonight. Scattered severe thunderstorms are possible this afternoon and early evening with a crossing cold front. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. 07
In the hours before
Local storm report, Aug 4, 6:23 PM EDT, 2 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
623 PM EDT FRI AUG 04 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0605 PM HAIL ELLWOOD CITY 40.86N 80.28W
08/04/2017 E1.00 INCH LAWRENCE PA PUBLIC
TREES SNAPPED IN BACK YARD.
&&
EVENT NUMBER PBZ1701996
AMILLERSpecial weather statement, Aug 4, 6:35 PM EDT, 2 hours 11 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 635 PM EDT FRI AUG 4 2017 OHZ040-041-050-WVZ001-042315- Jefferson-Columbiana-Carroll-Hancock- 635 PM EDT FRI AUG 4 2017 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT NORTHERN JEFFERSON...SOUTHEASTERN COLUMBIANA...CENTRAL CARROLL AND NORTHWESTERN HANCOCK COUNTIES... At 635 PM EDT, a strong thunderstorm was located over Carrollton, moving east at 30 mph. Wind gusts up to 55 mph are possible with this storm. Locations impacted include... East Liverpool... Wellsville... Carrollton... Calcutta... Lisbon... New Waterford... Augusta... Salineville... Newell... Bergholz... Irondale... Rogers... This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. LAT...LON 4049 8118 4064 8119 4087 8063 4055 8058 TIME...MOT...LOC 2235Z 247DEG 28KT 4059 8106 34
Local storm report, Aug 4, 7:07 PM EDT, 1 hour 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
707 PM EDT FRI AUG 04 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0615 PM TSTM WND DMG ELLWOOD CITY 40.86N 80.28W
08/04/2017 LAWRENCE PA 911 CALL CENTER
NUMEROUS TREES AND WIRES DOWN
&&
EVENT NUMBER PBZ1701997
AMILLERLocal storm report, Aug 4, 7:23 PM EDT, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
723 PM EDT FRI AUG 04 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM TSTM WND DMG 1 NW BROOKVILLE 41.17N 79.10W
08/04/2017 JEFFERSON PA NWS EMPLOYEE
TREES AND POWER POLES DOWN
&&
EVENT NUMBER PBZ1701998
RCCLocal storm report, Aug 4, 7:36 PM EDT, 1 hour 10 minutes before
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</html>Local storm report, Aug 4, 7:39 PM EDT, 1 hour 7 minutes before
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</html>Nearby
Special Weather Statements in Pennsylvania, 2017Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.