Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 19, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Aug 7, 2021, 4:53 PM EDT for Forest County, Pennsylvania. It was in force for 66 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, 4:53 PM EDT (20:53 UTC)
- Expired
- Aug 7, 2021, 5:59 PM EDT
- In force
- 66 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Forest County, PA
The radar
The Pittsburgh radar (KPBZ), 132 km from the middle of the area, began a volume at 20:53 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, 8.9 hours before the alert went out and 139 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.
435
WGUS51 KPBZ 072053
FFWPBZ
PAC053-072245-
/O.NEW.KPBZ.FF.W.0019.210807T2053Z-210807T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
453 PM EDT Sat Aug 7 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
Northwestern Forest County in northwestern Pennsylvania...
* Until 645 PM EDT.
* At 453 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...
West Hickory and East Hickory.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4160 7950 4160 7938 4151 7937 4151 7950
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
770
WGUS71 KPBZ 072108
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
508 PM EDT Sat Aug 7 2021
PAC053-072245-
/O.CON.KPBZ.FF.W.0019.000000T0000Z-210807T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Forest PA-
508 PM EDT Sat Aug 7 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM EDT THIS
EVENING FOR NORTHWESTERN FOREST COUNTY...
At 508 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
West Hickory and East Hickory.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4160 7950 4160 7938 4151 7937 4151 7950
FLASH FLOOD...RADAR INDICATED
$$140 WGUS71 KPBZ 072159 FFSPBZ Flash Flood Statement National Weather Service Pittsburgh PA 559 PM EDT Sat Aug 7 2021 PAC053-072209- /O.CAN.KPBZ.FF.W.0019.000000T0000Z-210807T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Forest PA- 559 PM EDT Sat Aug 7 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN FOREST COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4160 7950 4160 7938 4151 7937 4151 7950 $$
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 5:34 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Westmoreland | 31 min |
| Aug 7, 6:02 PM EDT | Flash Flood Warning | PBZ | Allegheny | 77 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.