Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 10, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jun 30, 2021, 2:12 PM EDT for 4 counties in Pennsylvania. It was in force for 3 hr. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 30, 2021, 2:12 PM EDT (18:12 UTC)
- Expired
- Jun 30, 2021, 5:15 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, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 27 km from the middle of the area, began a volume at 18:13 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 30, 2:14 PM EDT | FLASH FLOOD | Pleasant Hills, PA | REPORT THAT US ROAD 51 THROUGH PLEASANT HILLS IS CLOSED DUE TO FLOODING. |
| Jun 30, 2:18 PM EDT | FLASH FLOOD | Whitehall, PA | REPORT OF ROADWAYS CLOSED DUE TO FLOODING IN WHITEHALL BOROUGH. |
| Jun 30, 2:28 PM EDT | FLASH FLOOD | 1 E Dravosburg, PA | REPORT OF WEST 5TH AVENUE FLOODING OUT IN MCKEESPORT. |
| Jun 30, 2:47 PM EDT | FLASH FLOOD | West Mifflin, PA | EM REPORTING MULTIPLE REPORTS OF FLOODED ROADWAYS IN THE BALDWIN BORO, PLEASANT HILLS, WEST MIFFLING, AND WHITEHALL AREAS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 6.2 hours before the alert went out and 13 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
- 807 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1240 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.2
The text
As transmitted.
158
WGUS51 KPBZ 301812
FFWPBZ
PAC003-007-125-129-302115-
/O.NEW.KPBZ.FF.W.0010.210630T1812Z-210630T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
212 PM EDT Wed Jun 30 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
Allegheny County in southwestern Pennsylvania...
Central Washington County in southwestern Pennsylvania...
Northwestern Westmoreland County in southwestern Pennsylvania...
East Central Beaver County in western Pennsylvania...
* Until 515 PM EDT.
* At 212 PM EDT, Radar indicated thunderstorms producing heavy rain
across the warned area. Between 1 and 1.5 inches of rain have
fallen, with up to an 1.0 additional rainfall expected. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Pittsburgh, Penn Hills, Mount Lebanon, Bethel Park, Ross Township,
McCandless Township, Monroeville, Moon Township, McMurray,
McKeesport, Franklin Park, Jeannette, Gastonville, Shaler
Township, Plum, West Mifflin, North Side Pittsburgh, Baldwin,
Upper St. Clair and Murrysville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4062 8015 4062 7973 4044 7954 4025 7963
4017 7984 4022 8001 4028 8015 4043 8034
FLASH FLOOD...RADAR INDICATED
$$3 follow-up statements
941
WGUS71 KPBZ 301852
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
252 PM EDT Wed Jun 30 2021
PAC003-007-125-129-302115-
/O.CON.KPBZ.FF.W.0010.000000T0000Z-210630T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-Beaver PA-Washington PA-Westmoreland PA-
252 PM EDT Wed Jun 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT THIS
AFTERNOON FOR ALLEGHENY, CENTRAL WASHINGTON, NORTHWESTERN
WESTMORELAND AND EAST CENTRAL BEAVER COUNTIES...
At 252 PM EDT, Radar indicated thunderstorms producing heavy rain
across the warned area. Between 1.5 and 2 inches of rain have
fallen, with an additional 1.0 to 1.50 inches expected. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Pittsburgh, Penn Hills, Mount Lebanon, Bethel Park, Ross Township,
McCandless Township, Monroeville, Moon Township, McMurray,
McKeesport, Franklin Park, Jeannette, Gastonville, Shaler
Township, Plum, West Mifflin, North Side Pittsburgh, Baldwin,
Upper St. Clair and Murrysville.
Road closures have been reported by Emergency Management, especially
along Route 51 in the South Hills. Do not drive along flooded
roadways.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4062 8015 4062 7973 4044 7954 4025 7963
4017 7984 4022 8001 4028 8015 4043 8034
FLASH FLOOD...RADAR INDICATED
$$276
WGUS71 KPBZ 301953
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
353 PM EDT Wed Jun 30 2021
PAC003-007-125-129-302115-
/O.CON.KPBZ.FF.W.0010.000000T0000Z-210630T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-Beaver PA-Washington PA-Westmoreland PA-
353 PM EDT Wed Jun 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT THIS
AFTERNOON FOR ALLEGHENY, CENTRAL WASHINGTON, NORTHWESTERN
WESTMORELAND AND EAST CENTRAL BEAVER COUNTIES...
At 353 PM EDT, Radar indicated the heaviest rainfall has now moved
out, but widespread showers should continue to impact the area.
Between 2.0 and 2.5 inches of rain have fallen, with an additional
0.25 to 0.50 inches expected. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Pittsburgh, Penn Hills, Mount Lebanon, Bethel Park, Ross Township,
McCandless Township, Monroeville, Moon Township, McMurray,
McKeesport, Franklin Park, Jeannette, Gastonville, Shaler
Township, Plum, West Mifflin, North Side Pittsburgh, Baldwin,
Upper St. Clair and Murrysville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4062 8015 4062 7973 4044 7954 4025 7963
4017 7984 4022 8001 4028 8015 4043 8034
FLASH FLOOD...OBSERVED
$$509
WGUS71 KPBZ 302107
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
507 PM EDT Wed Jun 30 2021
PAC003-007-125-129-302117-
/O.EXP.KPBZ.FF.W.0010.000000T0000Z-210630T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-Beaver PA-Washington PA-Westmoreland PA-
507 PM EDT Wed Jun 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM EDT THIS AFTERNOON FOR
ALLEGHENY, CENTRAL WASHINGTON, NORTHWESTERN WESTMORELAND AND EAST
CENTRAL BEAVER COUNTIES...
The heavy rain has ended and water is receding. However, residual
runoff is still occuring, which may support localized flooding in
prone locations. Please continue to heed remaining road closures.
LAT...LON 4062 8015 4062 7973 4044 7954 4025 7963
4017 7984 4022 8001 4028 8015 4043 8034
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 8:02 PM EDT | Areal Flood Advisory | PBZ | Mercer, Venango | 118 min |
| Jun 30, 12:40 PM EDT | Special Weather Statement | PBZ | Washington | 50 min |
| Jun 30, 12:56 PM EDT | Special Weather Statement | PBZ | Allegheny | 34 min |
| Jun 30, 1:04 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 26 min |
| Jun 30, 1:06 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 24 min |
| Jun 30, 1:19 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
| Jun 30, 1:23 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 52 min |
| Jun 30, 1:29 PM EDT | Special Weather Statement | PBZ | Washington | 31 min |
| Jun 30, 1:52 PM EDT | Special Weather Statement | PBZ | Indiana | 23 min |
| Jun 30, 2:03 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 42 min |
| Jun 30, 2:14 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 2 hr |
| Jun 30, 2:26 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 49 min |
| Jun 30, 2:37 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 38 min |
| Jun 30, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 34 min |
| Jun 30, 2:45 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 45 min |
| Jun 30, 3:03 PM EDT | Special Weather Statement | PBZ | Armstrong | 27 min |
| Jun 30, 3:13 PM EDT | Special Weather Statement | PBZ | Greene | 32 min |
| Jun 30, 3:29 PM EDT | Special Weather Statement | PBZ | Fayette | 31 min |
| Jun 30, 3:32 PM EDT | Areal Flood Advisory | PBZ | Armstrong, Indiana | 3 hr |
| Jun 30, 3:35 PM EDT | Special Weather Statement | PBZ | Forest | 25 min |
| Jun 30, 3:52 PM EDT | Special Weather Statement | PBZ | Fayette | 23 min |
| Jun 30, 3:55 PM EDT | Special Weather Statement | PBZ | Jefferson | 35 min |
| Jun 30, 4:29 PM EDT | Special Weather Statement | PBZ | Butler | 31 min |
| Jun 30, 5:05 PM EDT | Special Weather Statement | PBZ | Mercer | 25 min |
| Jun 30, 5:11 PM EDT | Special Weather Statement | PBZ | Lawrence | 34 min |
| Jun 30, 5:58 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Washington | 47 min |
| Jun 30, 6:44 PM EDT | Special Weather Statement | PBZ | Allegheny | 46 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.