Alert archive / Pennsylvania / Flash Flood Warnings in 2019
Flash Flood Warning 105, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Sep 1, 2019, 10:03 PM EDT for Allegheny 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
- Sep 1, 2019, 10:03 PM EDT (02:03 UTC)
- Expired
- Sep 2, 2019, 1:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Allegheny County, PA
The radar
The Pittsburgh radar (KPBZ), 21 km from the middle of the area, began a volume at 02:05 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 00:00Z, 2.1 hours before the alert went out and 12 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
- 1217 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 6.1
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 Sep 1, 9:23 PM EDT, 40 minutes earlier.
Area forecast discussion, Sep 1, 9:23 PM EDT, 40 minutes before
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</html>Hazardous weather outlook, Sep 1, 5:43 AM EDT, 16 hours 20 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 543 AM EDT Sun Sep 1 2019 OHZ039>041-048>050-057>059-068-069-PAZ007-008-013>015-020>022-029- 031-073-075-WVZ001>004-012-021-509-020945- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Lawrence- Butler-Clarion-Beaver-Allegheny-Armstrong-Washington-Greene- Westmoreland-Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion- Monongalia- 543 AM EDT Sun Sep 1 2019 This Hazardous Weather Outlook is for 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. Isolated severe thunderstorms are possible this afternoon and early evening. Damaging wind is expected to be the main hazard. Locally heavy rain could also result in isolated flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. MDZ001-PAZ009-016-023-074-076-WVZ510>514-020945- Garrett-Forest-Jefferson PA-Indiana-Westmoreland Ridges- Fayette Ridges-Ridges of Eastern Monongalia and Northwestern Preston- Preston-Eastern Preston-Western Tucker-Eastern Tucker- 543 AM EDT Sun Sep 1 2019 This Hazardous Weather Outlook is for western Maryland, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania and northern West Virginia. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Monday through Saturday. 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, Sep 1, 8:19 PM EDT, 1 hour 44 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 819 PM EDT Sun Sep 1 2019 PAZ007-008-020045- Venango-Mercer- 819 PM EDT Sun Sep 1 2019 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL...GUSTY WIND AND HEAVY RAIN WILL AFFECT EAST CENTRAL MERCER AND SOUTHWESTERN VENANGO COUNTIES... At 818 PM EDT, a strong thunderstorm was located 8 miles north of Grove City, moving northeast at 30 mph. Wind gusts up to 45 mph and hail up to the size of nickels are possible with this storm. Locations impacted include... Franklin... Sugarcreek... Stoneboro... Seneca... Polk... Sandy Lake... Kennerdell... Jackson Center... Barkeyville... Utica... Cranberry Township... Maurice K Goddard State Park... This includes the following highways... Interstate 79 in Pennsylvania between mile markers 123 and 129. Interstate 80 in Pennsylvania between mile markers 21 and 27. Torrential rainfall also is occurring with this storm and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 4118 8012 4134 8021 4152 7981 4127 7966 TIME...MOT...LOC 0018Z 245DEG 25KT 4127 8011
Special weather statement, Sep 1, 8:32 PM EDT, 1 hour 31 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 832 PM EDT Sun Sep 1 2019 PAZ013-014-020-020100- Butler-Lawrence-Beaver- 832 PM EDT Sun Sep 1 2019 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL...GUSTY WIND AND HEAVY RAIN WILL AFFECT NORTHEASTERN BEAVER...SOUTHERN LAWRENCE AND WEST CENTRAL BUTLER COUNTIES... At 832 PM EDT, a strong thunderstorm was located over Ellwood City, or 7 miles north of Beaver Falls, moving northeast at 30 mph. Wind gusts up to 45 mph and hail up to the size of nickels are possible with this storm. Locations impacted include... Beaver Falls... Ellwood City... Meridian... Zelienople... Patterson Township... Big Beaver... New Beaver... West Mayfield... Ellport... Prospect... Plain Grove Township... Koppel... This includes the following highways... Pennsylvania Turnpike between mile markers 3 and 18. Interstate 79 in Pennsylvania between mile markers 89 and 106. Interstate 376 in Pennsylvania between mile markers 31 and 33. Torrential rainfall also is occurring with this storm and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Seek safe shelter inside a building or vehicle. This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. LAT...LON 4073 8037 4091 8048 4106 8009 4086 7996 TIME...MOT...LOC 0032Z 244DEG 24KT 4086 8030
Local storm report, Sep 1, 9:27 PM EDT, 36 minutes before
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</html>Local storm report, Sep 1, 9:33 PM EDT, 30 minutes before
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</html>Local storm report, Sep 1, 9:36 PM EDT, 27 minutes before
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</html>Local storm report, Sep 1, 9:42 PM EDT, 21 minutes 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 |
|---|---|---|---|---|
| Sep 1, 8:08 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 52 min |
| Sep 1, 8:19 PM EDT | Special Weather Statement | PBZ | Venango | 26 min |
| Sep 1, 8:26 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 49 min |
| Sep 1, 8:32 PM EDT | Special Weather Statement | PBZ | Lawrence | 28 min |
| Sep 1, 8:42 PM EDT | Areal Flood Advisory | PBZ | Beaver | 3 hr |
| Sep 1, 8:55 PM EDT | Areal Flood Advisory | PBZ | Lawrence | 3 hr |
| Sep 1, 9:15 PM EDT | Flash Flood Warning | PBZ | Beaver | 3 hr |
| Sep 1, 9:24 PM EDT | Flash Flood Warning | PBZ | Mercer, Venango | 3 hr |
| Sep 1, 11:37 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 38 min |
| Sep 1, 11:40 PM EDT | Special Weather Statement | PBZ | Allegheny, Armstrong, Washington | 65 min |
| Sep 2, 12:46 AM EDT | Special Weather Statement | PBZ | Armstrong, Fayette, Indiana, Westmoreland | 59 min |
| Sep 2, 12:59 AM EDT | Areal Flood Warning | PBZ | Allegheny | 3 hr |
| Sep 1, 8:15 PM EDT | Areal Flood Advisory | PBZ | Columbiana, Jefferson | 3 hr |
| Sep 1, 10:26 PM EDT | Special Weather Statement | PBZ | Guernsey | 34 min |
| Sep 1, 11:15 PM EDT | Special Weather Statement | PBZ | Belmont | 45 min |
| Sep 1, 11:55 PM EDT | Special Weather Statement | PBZ | Belmont, Monroe | 50 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2019Every flash flood warning in 2019
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.