Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 41, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Sep 1, 2021, 7:16 AM EDT for Armstrong County, Indiana County, Westmoreland County, Pennsylvania. It was in force for 6 hr. 3 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
- Sep 1, 2021, 7:16 AM EDT (11:16 UTC)
- Expired
- Sep 1, 2021, 1:15 PM EDT
- In force
- 6 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Armstrong County, PA, Indiana County, PA, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 93 km from the middle of the area, began a volume at 11:17 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 |
|---|---|---|---|
| Sep 1, 8:15 AM EDT | FLASH FLOOD | Heshbon, PA | COUNTY OFFICIALS REPORT FLOODED ROADWAYS ACROSS INDIANA COUNTY... INCLUDING THE TOWNSHIP OF WEST WHEATFIELD. |
| Sep 1, 8:18 AM EDT | FLASH FLOOD | Indiana, PA | COUNTY OFFICIALS REPORT FLOODED ROADWAYS ACROSS INDIANA COUNTY... INCLUDING THE TOWN OF INDIANA |
| Sep 1, 8:55 AM EDT | FLASH FLOOD | Bairdstown, PA | FLOODING AT THE BAIRDSTOWN ROAD EXIT TO ROUTE 22 |
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 00:00Z, 11.3 hours before the alert went out and 86 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
- 43 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 816 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
754
WGUS51 KPBZ 011116
FFWPBZ
PAC005-063-129-011715-
/O.NEW.KPBZ.FF.W.0041.210901T1116Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
716 AM EDT Wed Sep 1 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
East Central Westmoreland County in southwestern Pennsylvania...
East Central Armstrong County in west central Pennsylvania...
Indiana County in west central Pennsylvania...
* Until 115 PM EDT.
* At 716 AM EDT, Doppler radar indicated heavy rain across the
warned area. Between 1 and 1.5 inches of rain have fallen.
Additional rainfall amounts of 1.5 to 3 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by heavy rain.
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...
Indiana, Homer City, Blairsville, Black Lick, Clymer, Rural
Valley, West Lebanon, New Florence, Chevy Chase Heights, Seward,
Ernest, Marion Center, Cherry Tree, Creekside, Plumville, Glen
Campbell, Armagh, Atwood, Lucerne Mines and Dixonville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4052 7945 4065 7929 4079 7937 4084 7914
4084 7881 4077 7881 4072 7880 4072 7881
4047 7893 4037 7899 4042 7926 4047 7942
FLASH FLOOD...RADAR INDICATED
$$
SH4 follow-up statements
383
WGUS71 KPBZ 011221
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
821 AM EDT Wed Sep 1 2021
PAC005-063-129-011715-
/O.CON.KPBZ.FF.W.0041.000000T0000Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Armstrong PA-Indiana PA-Westmoreland PA-
821 AM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM EDT THIS
AFTERNOON FOR EAST CENTRAL WESTMORELAND, EAST CENTRAL ARMSTRONG AND
INDIANA COUNTIES...
At 821 AM EDT, local law enforcement reported heavy rain in Indiana
. Between 1.5 and 2 inches of rain have fallen. Additional rainfall
amounts of 1.5 to 3 inches are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Indiana, Homer City, Blairsville, Black Lick, Clymer, Rural
Valley, West Lebanon, New Florence, Chevy Chase Heights, Seward,
Ernest, Marion Center, Cherry Tree, Creekside, Plumville, Glen
Campbell, Armagh, Atwood, Lucerne Mines and Dixonville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4052 7945 4065 7929 4079 7937 4084 7914
4084 7881 4077 7881 4072 7880 4072 7881
4047 7893 4037 7899 4042 7926 4047 7942
FLASH FLOOD...OBSERVED
$$
SH285
WGUS71 KPBZ 011502
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
1102 AM EDT Wed Sep 1 2021
PAC005-063-129-011715-
/O.CON.KPBZ.FF.W.0041.000000T0000Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Armstrong PA-Indiana PA-Westmoreland PA-
1102 AM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM EDT THIS
AFTERNOON FOR EAST CENTRAL WESTMORELAND, EAST CENTRAL ARMSTRONG AND
INDIANA COUNTIES...
At 1102 AM EDT, local law enforcement reported heavy rain in Indiana
. Between 2 and 3.5 inches of rain have fallen. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement 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...
Indiana, Homer City, Blairsville, Black Lick, Clymer, Rural
Valley, West Lebanon, New Florence, Chevy Chase Heights, Seward,
Ernest, Marion Center, Cherry Tree, Creekside, Plumville, Glen
Campbell, Armagh, Atwood, Lucerne Mines and Dixonville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4052 7945 4065 7929 4079 7937 4084 7914
4084 7881 4077 7881 4072 7880 4072 7881
4047 7893 4037 7899 4042 7926 4047 7942
FLASH FLOOD...OBSERVED
$$
SH620
WGUS71 KPBZ 011602
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
1202 PM EDT Wed Sep 1 2021
PAC005-011612-
/O.CAN.KPBZ.FF.W.0041.000000T0000Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Armstrong PA-
1202 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL ARMSTRONG
COUNTY...
High water is receding. Please continue to heed remaining road
closures.
A Flash Flood Watch remains in effect until 200 AM EDT Thursday for
Portions of Pennsylvania. Portions of northern West Virginia.
LAT...LON 4052 7945 4071 7920 4081 7909 4084 7881
4072 7880 4072 7881 4048 7893 4037 7899
4042 7926 4047 7942
$$
PAC063-129-011715-
/O.CON.KPBZ.FF.W.0041.000000T0000Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Indiana PA-Westmoreland PA-
1202 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM EDT THIS
AFTERNOON FOR EAST CENTRAL WESTMORELAND AND INDIANA COUNTIES...
At 1202 PM EDT, local law enforcement reported heavy rain in Indiana
. Between 2 and 3.5 inches of rain have fallen. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement 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...
Indiana, Homer City, Blairsville, Black Lick, Clymer, New
Florence, Chevy Chase Heights, Seward, Ernest, Marion Center,
Cherry Tree, Creekside, Glen Campbell, Armagh, Lucerne Mines,
Dixonville, Commodore, Jacksonville, Brush Vly and Yellow Creek
State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4052 7945 4071 7920 4081 7909 4084 7881
4072 7880 4072 7881 4048 7893 4037 7899
4042 7926 4047 7942
FLASH FLOOD...OBSERVED
$$
SH098
WGUS71 KPBZ 011722
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
122 PM EDT Wed Sep 1 2021
PAC063-129-011732-
/O.EXP.KPBZ.FF.W.0041.000000T0000Z-210901T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Indiana PA-Westmoreland PA-
122 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR EAST CENTRAL WESTMORELAND AND
INDIANA COUNTIES...
The flash flood warning has been replaced with a base flood warning.
Flooding is still occuring.
LAT...LON 4052 7945 4071 7920 4081 7909 4084 7881
4072 7880 4072 7881 4048 7893 4037 7899
4042 7926 4047 7942
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 5:05 AM EDT | Areal Flood Advisory | PBZ | Allegheny, Beaver, Fayette, Washington, Westmoreland | 104 min |
| Sep 1, 6:23 AM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Indiana, Washington and 1 more | 5 hr |
| Sep 1, 7:21 AM EDT | Flash Flood Warning | PBZ | Fayette, Greene | 6 hr |
| Sep 1, 7:50 AM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Sep 1, 9:27 AM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Fayette, Greene, Indiana, Washington and 1 more | 4 hr |
| Sep 1, 10:26 AM EDT | Areal Flood Advisory | PBZ | Washington | 109 min |
| Sep 1, 11:23 AM EDT | Areal Flood Advisory | PBZ | Allegheny, Armstrong, Beaver, Butler, Indiana, Washington and 1 more | 52 min |
| Sep 1, 11:30 AM EDT | River Flood Warning | PBZ | Indiana, Westmoreland | 16 hr |
| Sep 1, 11:30 AM EDT | River Flood Warning | PBZ | Fayette | 39 hr |
| Sep 1, 11:30 AM EDT | River Flood Warning | PBZ | Fayette, Washington, Westmoreland | 28 hr |
| Sep 1, 11:30 AM EDT | River Flood Warning | PBZ | Allegheny, Westmoreland | 40 hr |
| Sep 1, 11:30 AM EDT | River Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 33 hr |
| Sep 1, 1:15 PM EDT | Areal Flood Warning | PBZ | Fayette | 2 hr |
| Sep 1, 1:16 PM EDT | Areal Flood Warning | PBZ | Indiana, Westmoreland | 2 hr |
| Sep 1, 1:24 PM EDT | Areal Flood Warning | PBZ | Fayette, Indiana, Westmoreland | 2 hr |
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.