Alert archive / Pennsylvania / Flash Flood Warnings in 2020
Flash Flood Warning 15, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 7, 2020, 5:48 PM EDT for Allegheny County, Beaver County, Washington County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 7, 2020, 5:48 PM EDT (21:48 UTC)
- Expired
- Jul 7, 2020, 9:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allegheny County, PA, Beaver County, PA, Washington County, PA
The radar
The Pittsburgh radar (KPBZ), 10 km from the middle of the area, began a volume at 21:51 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 (KPIT), launched 12:00Z, 9.8 hours before the alert went out and 9 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1848 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Jul 7, 4:43 PM EDT, 1 hour 5 minutes earlier.
Area forecast discussion, Jul 7, 4:43 PM EDT, 1 hour 5 minutes before
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</html>Hazardous weather outlook, Jul 7, 3:16 AM EDT, 14 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 316 AM EDT Tue Jul 7 2020 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-080730- Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison- Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango- Forest-Lawrence-Butler-Clarion-Jefferson PA-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- 316 AM EDT Tue Jul 7 2020 This Hazardous Weather Outlook is for western Maryland, east central Ohio, northwest Pennsylvania, southwest Pennsylvania, western Pennsylvania, northern West Virginia and the northern panhandle of West Virginia. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .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.
In the hours before
Special weather statement, Jul 7, 4:13 PM EDT, 1 hour 35 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 413 PM EDT Tue Jul 7 2020 PAZ020-072045- Beaver- 413 PM EDT Tue Jul 7 2020 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WIND WILL AFFECT NORTHEASTERN BEAVER COUNTY... At 412 PM EDT, a strong thunderstorm was located over Beaver Falls, moving northeast at 10 mph. Wind gusts up to 45 mph and small hail are possible with this storm. Locations impacted include... Beaver Falls... New Brighton... Rochester... Patterson Township... Big Beaver... West Mayfield... Bridgewater... Patterson Heights... Fallston... Eastvale... This includes the following highways... Pennsylvania Turnpike between mile markers 14 and 20. Interstate 376 in Pennsylvania near mile marker 31. This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. LAT...LON 4070 8029 4078 8038 4085 8024 4078 8016 TIME...MOT...LOC 2012Z 235DEG 10KT 4077 8029 CL
Special weather statement, Jul 7, 4:41 PM EDT, 1 hour 7 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
441 PM EDT Tue Jul 7 2020
PAZ020-021-072115-
Beaver-Allegheny-
441 PM EDT Tue Jul 7 2020
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHEASTERN BEAVER AND NORTHWESTERN ALLEGHENY
COUNTIES...
At 441 PM EDT, a strong thunderstorm was located over Imperial, or
near Moon Township, moving northeast at 15 mph.
Wind gusts up to 45 mph and small hail are possible with this storm.
Locations impacted include...
Moon Township... Aliquippa...
Robinson Township... Economy...
Kennedy Township... Ambridge...
Coraopolis... Baden...
Sewickley... Harmony Township...
Imperial... Emsworth...
This includes the following highways...
Interstate 79 in Pennsylvania between mile markers 64 and 69.
Interstate 376 in Pennsylvania between mile markers 47 and 59.
LAT...LON 4064 8021 4051 8008 4039 8026 4041 8028
4052 8037
TIME...MOT...LOC 2041Z 236DEG 15KT 4049 8026
CLLocal storm report, Jul 7, 4:47 PM EDT, 1 hour 1 minute before
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</html>Local storm report, Jul 7, 4:53 PM EDT, 55 minutes before
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</html>Special weather statement, Jul 7, 5:47 PM EDT, 1 minute before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 4:13 PM EDT | Special Weather Statement | PBZ | Beaver | 32 min |
| Jul 7, 4:28 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 32 min |
| Jul 7, 4:34 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 26 min |
| Jul 7, 4:41 PM EDT | Special Weather Statement | PBZ | Allegheny | 34 min |
| Jul 7, 5:16 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 29 min |
| Jul 7, 6:04 PM EDT | Special Weather Statement | PBZ | Fayette | 26 min |
| Jul 7, 6:20 PM EDT | Areal Flood Advisory | PBZ | Fayette, Westmoreland | 3 hr |
| Jul 7, 7:25 PM EDT | Areal Flood Advisory | PBZ | Fayette, Washington, Westmoreland | 2 hr |
| Jul 7, 7:31 PM EDT | Special Weather Statement | PBZ | Jefferson | 14 min |
| Jul 7, 7:39 PM EDT | Special Weather Statement | PBZ | Indiana | 36 min |
| Jul 7, 7:53 PM EDT | Special Weather Statement | PBZ | Jefferson | 22 min |
| Jul 7, 2:26 PM EDT | Severe Thunderstorm Warning | PBZ | Muskingum | 28 min |
| Jul 7, 2:49 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton | 26 min |
| Jul 7, 2:52 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton, Guernsey, Muskingum, Tuscarawas | 23 min |
| Jul 7, 3:08 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton, Guernsey, Muskingum, Tuscarawas | 37 min |
| Jul 7, 3:09 PM EDT | Areal Flood Advisory | PBZ | Guernsey, Muskingum, Noble | 3 hr |
| Jul 7, 3:35 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Tuscarawas | 25 min |
| Jul 7, 3:37 PM EDT | Areal Flood Advisory | PBZ | Coshocton, Guernsey, Muskingum, Tuscarawas | 113 min |
| Jul 7, 3:51 PM EDT | Special Weather Statement | PBZ | Columbiana | 24 min |
| Jul 7, 4:19 PM EDT | Areal Flood Advisory | PBZ | Carroll, Harrison, Tuscarawas | 3 hr |
| Jul 7, 4:31 PM EDT | Flash Flood Warning | PBZ | Carroll, Tuscarawas | 119 min |
| Jul 7, 4:59 PM EDT | Areal Flood Advisory | PBZ | Carroll, Harrison, Jefferson | 2 hr |
| Jul 7, 4:52 PM EDT | Special Weather Statement | PBZ | Hancock | 38 min |
| Jul 7, 7:11 PM EDT | Special Weather Statement | PBZ | Taylor | 34 min |
| Jul 7, 7:36 PM EDT | Areal Flood Advisory | PBZ | Marion, Monongalia, Preston | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2020Every flash flood warning in 2020
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.