Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 159, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 21, 2018, 1:52 PM EDT for Indiana County, Westmoreland County, Pennsylvania. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2018, 1:52 PM EDT (17:52 UTC)
- Expired
- Aug 21, 2018, 2:30 PM EDT
- In force
- 38 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Indiana County, PA, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 80 km from the middle of the area, began a volume at 17:54 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
Pittsburgh, PA (KAGC), launched 12:00Z, 5.9 hours before the alert went out and 70 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
- 340 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 811 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.5
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 21, 9:22 AM EDT, 4 hours 30 minutes earlier.
Area forecast discussion, Aug 21, 9:22 AM EDT, 4 hours 30 minutes before
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</html>Hazardous weather outlook, Aug 21, 9:24 AM EDT, 4 hours 28 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Pittsburgh PA 924 AM EDT Tue Aug 21 2018 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-221330- 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- 924 AM EDT Tue Aug 21 2018 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. Strong to severe storms capable of damaging wind gusts and a couple of tornadoes will be possible this afternoon and evening. Heavy downpours also will be possible, which could lead to localized flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time, but spotters are encouraged to report severe weather to the National Weather Service. Kramar
In the hours before
Special weather statement, Aug 21, 12:50 PM EDT, 1 hour 2 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
1250 PM EDT TUE AUG 21 2018
PAZ031-WVZ004-012-211715-
Greene-Marshall-Wetzel-
1250 PM EDT TUE AUG 21 2018
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT
SOUTHWESTERN GREENE...WETZEL AND SOUTHEASTERN MARSHALL COUNTIES...
At 1249 PM EDT, a strong thunderstorm was located near Pine Grove, or
near New Martinsville, moving northeast at 40 mph.
Wind gusts up to 45 mph are possible with this storm.
Locations impacted include...
New Martinsville... Pine Grove...
Hundred... Jacksonburg...
Porters Falls... Wileyville...
Burton... Big Run...
Reader... Earnshaw...
Knob Fork... Littleton...
Frequent cloud to ground lightning is occurring with this storm. Seek
safe shelter inside a building or vehicle.
LAT...LON 3951 8074 3954 8078 3955 8079 3956 8081
3956 8082 3958 8083 3958 8085 3960 8085
3958 8088 3960 8093 3979 8054 3967 8040
3965 8039 3963 8040 3964 8043 3963 8044
3962 8044 3949 8073
TIME...MOT...LOC 1649Z 241DEG 37KT 3957 8078
CLSpecial weather statement, Aug 21, 1:18 PM EDT, 34 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
118 PM EDT TUE AUG 21 2018
PAZ029-031-WVZ004-211745-
Greene-Washington-Marshall-
118 PM EDT TUE AUG 21 2018
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT
SOUTHWESTERN WASHINGTON...NORTHWESTERN GREENE AND EASTERN MARSHALL
COUNTIES...
At 117 PM EDT, a strong thunderstorm was located near Cameron, or
near Moundsville, moving northeast at 45 mph.
A wind gust of 45 MPH was earlier reported from this storm near New
Martinsville. Gusts of that speed remain possible.
Locations impacted include...
Cameron... West Finley...
Nineveh... Rocklick...
Lynn Camp... Lone Oak...
Grove Oak... Glen Easton...
Dallas... Beelers Station...
LAT...LON 3985 8079 4002 8053 4002 8052 4003 8052
4008 8044 3994 8026 3976 8069
TIME...MOT...LOC 1717Z 233DEG 37KT 3983 8068
CLSpecial weather statement, Aug 21, 1:25 PM EDT, 27 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
125 PM EDT TUE AUG 21 2018
WVZ511>514-211800-
Eastern Preston-Eastern Tucker-Western Tucker-Preston-
125 PM EDT TUE AUG 21 2018
...A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING GUSTY WIND AND
HEAVY RAIN WILL AFFECT NORTHWESTERN TUCKER AND SOUTHERN PRESTON
COUNTIES...
At 125 PM EDT, radar indicated strong thunderstorms were located
along a line extending from 10 miles south of Newburg to 7 miles
northeast of Belington. Movement was northeast at 25 mph.
Wind gusts up to 45 mph are possible with these storms.
Locations impacted include...
Parsons... Hannahsville...
Aurora... Elgon...
Benbush... Lead Mine...
Pifer Moutain... Davisville...
Saint George... Cathedral State Park...
Torrential rainfall also is occurring with these storms and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3911 7980 3912 7983 3913 7984 3918 7983
3918 7982 3920 7983 3923 7981 3924 7982
3924 7985 3926 7985 3934 7950 3911 7951
3908 7978
TIME...MOT...LOC 1725Z 237DEG 20KT 3924 7985 3912 7986
KramarSpecial weather statement, Aug 21, 1:42 PM EDT, 10 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
142 PM EDT TUE AUG 21 2018
PAZ023-073-074-211815-
Westmoreland Ridges-Westmoreland-Indiana-
142 PM EDT TUE AUG 21 2018
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT
SOUTHEASTERN INDIANA AND SOUTHEASTERN WESTMORELAND COUNTIES...
At 142 PM EDT, a strong thunderstorm was located over Ligonier, or
near Latrobe, moving northeast at 25 mph.
Wind gusts up to 55 mph are possible with this storm.
Locations impacted include...
Latrobe... McChesneytown-Loyalhanna...
Derry... Lawson Heights...
Ligonier... Black Lick...
New Florence... Seward...
Bolivar... Youngstown...
Armagh... Brush Vly...
This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.
LAT...LON 4037 7899 4026 7908 4017 7930 4031 7941
4060 7896 4053 7890
TIME...MOT...LOC 1742Z 235DEG 23KT 4025 7929
CLThe office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:42 PM EDT | Special Weather Statement | PBZ | Westmoreland | 33 min |
| Aug 21, 2:13 PM EDT | Special Weather Statement | PBZ | Armstrong | 32 min |
| Aug 21, 2:35 PM EDT | Tornado Warning | PBZ | Armstrong, Clarion, Jefferson | 25 min |
| Aug 21, 3:11 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 34 min |
| Aug 21, 3:30 PM EDT | Areal Flood Advisory | PBZ | Jefferson | 3 hr |
| Aug 21, 3:42 PM EDT | Areal Flood Advisory | PBZ | Jefferson | 3 hr |
| Aug 21, 4:04 PM EDT | Special Weather Statement | PBZ | Jefferson | 26 min |
| Aug 21, 5:29 PM EDT | Special Weather Statement | PBZ | Butler | 31 min |
| Aug 21, 7:13 PM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 3 hr |
| Aug 21, 12:02 AM EDT | Special Weather Statement | PBZ | Noble | 43 min |
| Aug 21, 6:32 AM EDT | Special Weather Statement | PBZ | Brooke | 28 min |
| Aug 21, 12:50 PM EDT | Special Weather Statement | PBZ | Wetzel | 25 min |
| Aug 21, 1:18 PM EDT | Special Weather Statement | PBZ | Marshall | 27 min |
| Aug 21, 1:25 PM EDT | Special Weather Statement | PBZ | Tucker | 35 min |
| Aug 21, 2:06 PM EDT | Special Weather Statement | PBZ | Tucker | 39 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2018Every severe thunderstorm warning in 2018
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.