Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 44, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Sep 1, 2021, 9:27 AM EDT for 7 counties in Pennsylvania. It was in force for 4 hr. 13 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, 9:27 AM EDT (13:27 UTC)
- Expired
- Sep 1, 2021, 1:24 PM EDT
- In force
- 4 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allegheny County, PA, Armstrong County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Washington County, PA, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 72 km from the middle of the area, began a volume at 13:30 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, 9:32 AM EDT | FLASH FLOOD | 1 Nw Carbon, PA | NORTH GREENGATE ROAD - UNDERPASS FLOODED WITH FOUR FEET OF WATER. VEHICLE STUCK IN WATER, WITH ONE PERSON ESCAPING THROUGH THE VEHICLE WINDOW |
| Sep 1, 9:50 AM EDT | FLASH FLOOD | 1 E Greensburg, PA | NEW ALEXANDRIA ROAD FLOODED |
| Sep 1, 9:50 AM EDT | FLASH FLOOD | 1 S New Florence, PA | FLOODING AT THE INTERSECTION OF SHANNON CREEK ROAD AND MICHIGAN LANE |
| Sep 1, 10:00 AM EDT | HEAVY RAIN 2.46 | Greensburg, PA | 24-HOUR RAINFALL MEASUREMENT THROUGH 10AM |
| Sep 1, 10:13 AM EDT | FLASH FLOOD | 1 Se Delmont, PA | FLOODING IN A BARN WITH LIVESTOCK ON BUSINESS ROUTE 66 |
| Sep 1, 10:15 AM EDT | FLASH FLOOD | 1 Se New Florence, PA | FLOODING ON FURNACE LANE |
| Sep 1, 10:40 AM EDT | FLASH FLOOD | 1 Nnw Lloydsville, PA | LATROBE CRABTREE ROAD FLOODED |
| Sep 1, 10:40 AM EDT | FLASH FLOOD | Penn, PA | SOUTH CARBON STREET FLOODED |
| Sep 1, 10:53 AM EDT | FLASH FLOOD | Midway, PA | STATE ROUTE 119 FLOODED NEAR SHADY LANE |
| Sep 1, 11:12 AM EDT | FLASH FLOOD | Crabtree, PA | RIZZO ROAD FLOODED FROM CRABTREE CREEK |
| Sep 1, 11:19 AM EDT | FLASH FLOOD | Midway, PA | ROUTE 119 IN THE AREA OF SOUTH GRANDE BOULEVARD IS CLOSED IN BOTH DIRECTIONS DUE TO FLOODING |
| Sep 1, 11:23 AM EDT | HEAVY RAIN 3.04 | Monessen, PA | RAINFALL SINCE 2 AM. |
| Sep 1, 12:06 PM EDT | FLASH FLOOD | Midway, PA | ROUTE 119 CLOSED DUE TO FLOODING; JACKS RUN CREEK OUT OF BANKS IN THIS LOCATION. |
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, 1.5 hours before the alert went out and 55 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
- 666 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -93 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
126
WGUS51 KPBZ 011327
FFWPBZ
PAC003-005-051-059-063-125-129-011930-
/O.NEW.KPBZ.FF.W.0044.210901T1327Z-210901T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
927 AM EDT Wed Sep 1 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
Southeastern Allegheny County in southwestern Pennsylvania...
Fayette County in southwestern Pennsylvania...
Northeastern Greene County in southwestern Pennsylvania...
Southeastern Washington County in southwestern Pennsylvania...
Westmoreland County in southwestern Pennsylvania...
South Central Armstrong County in west central Pennsylvania...
Southwestern Indiana County in west central Pennsylvania...
* Until 330 PM EDT Wednesday.
* At 927 AM EDT, Doppler radar indicated heavy rain across the
warned area. Between 1 and 2 inches of rain have fallen.
Additional rainfall amounts of 1 to 2.5 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...
Pittsburgh, Bethel Park, Monroeville, McMurray, Greensburg,
McKeesport, Uniontown, Jeannette, Canonsburg, Latrobe,
Connellsville, Gastonville, West Mifflin, Baldwin, Upper St.
Clair, Murrysville, South Park Township, Jefferson Hills, North
Versailles and Pleasant Hills.
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 4032 8005 4043 7969 4055 7943 4040 7897
4012 7918 4009 7926 4000 7933 3990 7940
3985 7942 3983 7940 3990 7962 3978 7990
4024 8021
FLASH FLOOD...RADAR INDICATED
$$
SH3 follow-up statements
389
WGUS71 KPBZ 011436
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
1036 AM EDT Wed Sep 1 2021
PAC003-005-051-059-063-125-129-011930-
/O.CON.KPBZ.FF.W.0044.000000T0000Z-210901T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-Armstrong PA-Fayette PA-Greene PA-Indiana PA-
Washington PA-Westmoreland PA-
1036 AM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM EDT THIS
AFTERNOON FOR SOUTHEASTERN ALLEGHENY, FAYETTE, NORTHEASTERN GREENE,
SOUTHEASTERN WASHINGTON, WESTMORELAND, SOUTH CENTRAL ARMSTRONG AND
SOUTHWESTERN INDIANA COUNTIES...
At 1036 AM EDT, local law enforcement reported heavy rain across the
warned area. Between 1.5 and 2.5 inches of rain have fallen.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Pittsburgh, Bethel Park, Monroeville, McMurray, Greensburg,
McKeesport, Uniontown, Jeannette, Canonsburg, Latrobe,
Connellsville, Gastonville, West Mifflin, Baldwin, Upper St.
Clair, Murrysville, South Park Township, Jefferson Hills, North
Versailles and Pleasant Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4032 8005 4043 7969 4055 7943 4040 7897
4012 7918 4009 7926 4000 7933 3990 7940
3985 7942 3983 7940 3990 7962 3978 7990
4024 8021
FLASH FLOOD...OBSERVED
$$
SH843
WGUS71 KPBZ 011600
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
1200 PM EDT Wed Sep 1 2021
PAC003-005-059-125-011610-
/O.CAN.KPBZ.FF.W.0044.000000T0000Z-210901T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-Armstrong PA-Greene PA-Washington PA-
1200 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN ALLEGHENY,
NORTHEASTERN GREENE, SOUTHEASTERN WASHINGTON AND SOUTH CENTRAL
ARMSTRONG COUNTIES...
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 4014 7986 4023 7978 4023 7979 4039 7968
4052 7944 4040 7897 4016 7915 4016 7916
4012 7918 4012 7921 4009 7926 4000 7933
3990 7940 3985 7942 3983 7940 3990 7962
3978 7990 4003 7982
$$
PAC051-063-129-011930-
/O.CON.KPBZ.FF.W.0044.000000T0000Z-210901T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette PA-Indiana PA-Westmoreland PA-
1200 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM EDT THIS
AFTERNOON FOR CENTRAL FAYETTE, WESTMORELAND AND SOUTHWESTERN INDIANA
COUNTIES...
At 1200 PM EDT, local law enforcement reported heavy rain across the
warned area. Between 2.0 and 2.5 inches of rain have fallen.
Additional rainfall amounts of 1 to 1.5 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Greensburg, Uniontown, Jeannette, Latrobe, Connellsville,
Murrysville, Mount Pleasant, Scottdale, Irwin,
McChesneytown-Loyalhanna, Blairsville, Manor, Youngwood, Derry,
Delmont, West Newton, Lawson Heights, New Stanton, South
Connellsville and Perryopolis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4014 7986 4023 7978 4023 7979 4039 7968
4052 7944 4040 7897 4016 7915 4016 7916
4012 7918 4012 7921 4009 7926 4000 7933
3990 7940 3985 7942 3983 7940 3990 7962
3978 7990 4003 7982
FLASH FLOOD...OBSERVED
$$
SH857
WGUS71 KPBZ 011724
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
124 PM EDT Wed Sep 1 2021
PAC051-063-129-011734-
/O.CAN.KPBZ.FF.W.0044.000000T0000Z-210901T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette PA-Indiana PA-Westmoreland PA-
124 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING FOR CENTRAL FAYETTE, WESTMORELAND AND
SOUTHWESTERN INDIANA COUNTIES HAS BEEN REPLACED WITH A FLOOD
WARNING...
The flash flood warning has been replaced with a base flood warning.
Flooding is still occuring.
LAT...LON 4014 7986 4023 7978 4023 7979 4039 7968
4052 7944 4040 7897 4016 7915 4016 7916
4012 7918 4012 7921 4009 7926 4000 7933
3990 7940 3985 7942 3983 7940 3990 7962
3978 7990 4003 7982
$$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, 7:16 AM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Westmoreland | 6 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, 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.