Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 20, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Aug 7, 2021, 6:02 PM EDT for Allegheny County, Pennsylvania. It was in force for 77 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2021, 6:02 PM EDT (22:02 UTC)
- Expired
- Aug 7, 2021, 7:19 PM EDT
- In force
- 77 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Allegheny County, PA
The radar
The Pittsburgh radar (KPBZ), 39 km from the middle of the area, began a volume at 22:05 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 12:00Z, 10.0 hours before the alert went out and 31 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
- 129 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1226 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
552
WGUS51 KPBZ 072202
FFWPBZ
PAC003-080000-
/O.NEW.KPBZ.FF.W.0020.210807T2202Z-210808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
602 PM EDT Sat Aug 7 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
East Central Allegheny County in southwestern Pennsylvania...
* Until 800 PM EDT.
* At 602 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. 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...
Plum.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4053 7979 4054 7973 4050 7971 4049 7978
FLASH FLOOD...RADAR INDICATED
$$3 follow-up statements
051
WGUS71 KPBZ 072213
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
613 PM EDT Sat Aug 7 2021
PAC003-080000-
/O.CON.KPBZ.FF.W.0020.000000T0000Z-210808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-
613 PM EDT Sat Aug 7 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
FOR EAST CENTRAL ALLEGHENY COUNTY...
At 613 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 2.5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Plum.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4053 7979 4054 7973 4050 7971 4049 7978
FLASH FLOOD...RADAR INDICATED
$$646
WGUS71 KPBZ 072238
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
638 PM EDT Sat Aug 7 2021
PAC003-080000-
/O.CON.KPBZ.FF.W.0020.000000T0000Z-210808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegheny PA-
638 PM EDT Sat Aug 7 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
FOR EAST CENTRAL ALLEGHENY COUNTY...
At 638 PM EDT, the public reported flooding across the warned area.
Between 2 and 3 inches of rain have fallen.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public 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...
Plum.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4053 7979 4054 7973 4050 7971 4049 7978
FLASH FLOOD...OBSERVED
$$408 WGUS71 KPBZ 072319 FFSPBZ Flash Flood Statement National Weather Service Pittsburgh PA 719 PM EDT Sat Aug 7 2021 PAC003-072329- /O.CAN.KPBZ.FF.W.0020.000000T0000Z-210808T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Allegheny PA- 719 PM EDT Sat Aug 7 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL ALLEGHENY COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4053 7979 4054 7973 4050 7971 4049 7978 $$
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 4:53 PM EDT | Flash Flood Warning | PBZ | Forest | 66 min |
| Aug 7, 5:34 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Westmoreland | 31 min |
| Aug 7, 7:23 PM EDT | Special Weather Statement | PBZ | Allegheny | 22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.