Alert archive / Pennsylvania / Flash Flood Warnings in 2012
Flash Flood Warning 9, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 20, 2012, 2:02 PM EDT for Allegheny County, Washington County, Pennsylvania. It was in force for 5 hr. 18 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
- Jul 20, 2012, 2:02 PM EDT (18:02 UTC)
- Expired
- Jul 20, 2012, 6:57 PM EDT
- In force
- 5 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allegheny County, PA, Washington County, PA
The radar
The Pittsburgh radar (KPBZ), 36 km from the middle of the area, began a volume at 18:03 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 |
|---|---|---|---|
| Jul 20, 2:05 PM EDT | FLASH FLOOD | 3 Se Pittsburgh, PA | RT. 51 AT WHITED STREET... A VEHICLE FLOATING IN THE FLOODED ROADWAY. RT. 51 AT LEWIS RUN - FEMALE RESCUED CITY OF PITTSBURGH HAS DEPLOYED THEIR WATER RESCUE TEAMS TO THE AREAS THAT HAVE REPORTED FLOODING |
| Jul 20, 2:10 PM EDT | FLASH FLOOD | 2 S Pittsburgh, PA | ROUTE 51 AT EAST BRUCETON ROAD - SHUT DOWN DOWN DUE TO FLOODING |
| Jul 20, 2:20 PM EDT | FLOOD | Imperial, PA | CLIFF MINE ROAD AND MAHONEY ROAD ARE BOTH CLOSED DUE TO FLOODING. |
| Jul 20, 2:20 PM EDT | FLOOD | Oakdale, PA | OAKDALE ROAD CLOSED DUE TO FLOODING |
| Jul 20, 2:24 PM EDT | FLASH FLOOD | Mckeesport, PA | ROAD FLOODING |
| Jul 20, 2:26 PM EDT | FLASH FLOOD | Whitehall, PA | CREEKS OUT OF THEIR BANKS FLOODING ROADWAYS |
| Jul 20, 2:27 PM EDT | FLASH FLOOD | West Mifflin, PA | WATER RUNNING DOWN ROUTE 51 IN WEST MIFFLIN |
| Jul 20, 2:31 PM EDT | FLASH FLOOD | Baldwin, PA | CREEKS OUT OF BANKS AND FLOODING ALONG STREETS RUN ROAD |
| Jul 20, 3:05 PM EDT | FLASH FLOOD | Mckeesport, PA | COAL VALLEY ROAD AT CLAIRTON ROAD - REPORTED ROADWAY FLOODING |
| Jul 20, 3:06 PM EDT | FLASH FLOOD | White Oak, PA | WHITE OAK - ROADWAY FLOODING - ON E 5TH BETWEEN PENNSYLVANIA AND LINCOLN THERE IS APPROX 4 FOOT OF WATER IN THE ROADWAY. |
| Jul 20, 3:07 PM EDT | FLASH FLOOD | Carrick, PA | ROUTE 51 AT BROWNSVILLE ROAD IS COMPLETELY SHUT DOWN BY FLOODING. |
| Jul 20, 3:08 PM EDT | FLASH FLOOD | Dravosburg, PA | DRAVOSBURG-FLOODING CONDITION ON ROUTE 837. |
| Jul 20, 3:14 PM EDT | FLASH FLOOD | Clairton, PA | WORTHINGTON AVE - ROADWAY FLOODED - POSSIBLY 3 FEET OF WATER IN THE ROADWAY. |
| Jul 20, 3:16 PM EDT | FLASH FLOOD | 2 S Pittsburgh, PA | THERE IS A MINUMUM OF 18 MUNICIPALITIES AFFECTED BY THE FLOODING. THE WORST HIT ARES IS THE ROUTE 51 CORRIDOR FRM THE JEFFERSON HILLS LINE TO THE CITY OF PITTSBURGH. ALSO... THE HAYS STREETS RUN ROAD AREA HAS BEEN HARD HIT. |
| Jul 20, 3:19 PM EDT | FLASH FLOOD | 3 S Robinson Township, PA | NORTH FAYETTE TOWNSHIP FLOODING ON THE FOLLOWING ROADWAYS. MAHONEY ROAD OAKDALE ROAD |
| Jul 20, 3:21 PM EDT | FLASH FLOOD | Robinson Township, PA | CAMPBELLS RUN ROAD FLOODED. |
| Jul 20, 4:11 PM EDT | FLASH FLOOD | Imperial, PA | WATER FROM CREEK IN IMPERIAL HAS RUN OUT OF ITS BANKS AND IS FLOODING BRIDGES AND A FEW HOMES |
| Jul 20, 4:26 PM EDT | FLASH FLOOD | Imperial, PA | FLOODED HOUSES AND BRIDGES FLOODED NEAR MCCLAREN ROAD |
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, 6.0 hours before the alert went out and 19 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
- 474 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 492 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
568
WGUS51 KPBZ 201802
FFWPBZ
PAC003-125-202100-
/O.NEW.KPBZ.FF.W.0009.120720T1802Z-120720T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
202 PM EDT FRI JUL 20 2012
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
NORTHERN WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...
* UNTIL 500 PM EDT
* AT 158 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND LOCAL
RAINFALL GAUGES REPORTED RAINFALL RATES IN EXCESS OF 2.5 INCHES PER
HOUR. THIS IS LIKELY CAUSING ADDITIONAL RISING WATER OVER LOCAL
ROADWAYS AND IN LOCAL STREAMS...ESPECIALLY ACROSS SOUTHERN ALLEGHENY
COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF WILL CAUSE FLOODING OF SMALL STREAMS...LOW LYING
SPOTS ON ROADS...AND POOR DRAINAGE AREAS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
THE WATER DEPTH MAY BE TOO GREAT FOR SAFE PASSAGE.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
LAT...LON 4039 7976 4030 7979 4028 7978 4028 7980
4026 7979 4024 7981 4023 7978 4020 7986
4017 7985 4015 7991 4023 8049 4041 8050
4053 8026 4040 7974
$$
FRIES3 follow-up statements
758
WGUS71 KPBZ 201846
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
246 PM EDT FRI JUL 20 2012
PAC003-125-202100-
/O.CON.KPBZ.FF.W.0009.000000T0000Z-120720T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-WASHINGTON PA-
246 PM EDT FRI JUL 20 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR
WASHINGTON AND ALLEGHENY COUNTIES...
ALLEGHENY COUNTY EMERGENCY MANAGEMENT ARE REPORTING WIDESPREAD FLASH
FLOODING ACROSS MUCH OF THE SOUTHERN HALF OF ALLEGHENY COUNTY. THIS
IS A SERIOUS SITUATION. THERE HAVE BEEN SEVERAL WATER RESCUES FROM
VEHICLES. THE CITY OF PITTSBURGH HAS DEPLOYED THEIR WATER RESCUE TEAMS
TO THE AREAS THAT HAVE REPORTED FLOODING. MUCH OF THE SERIOUS
FLOODING HAS BEEN ALONG THE ROUTE 51 COORIDOR AND IN THE IMPERIAL
AREA.
NEVER DRIVE INTO A FLOODED AREA AND MOVE TO HIGHER GROUND
IMMEDIATELY IF RISING WATER APPROACH.
RAINFALL RATES OF NEARLY 3 INCHES PER HOUR HAVE BEEN REPORTED. THE
TORRENTIAL DOWNPOURS WILL CONTINUE TO MOVE OVER THE SAME AREA
THROUGH 5PM.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEST
MIFFLIN...UPPER SAINT CLAIR...TURTLE CREEK...SOUTH SIDE PITTSBURGH...
PITTSBURGH...OAKLAND...OAKDALE...NORTH SIDE PITTSBURGH...MOUNT
WASHINGTON...MOUNT LEBANON...MOON...MCKEESPORT...MCKEES ROCKS...
MCDONALD...IMPERIAL...FLORENCE...CARNEGIE...BURGETTSTOWN...
BRIDGEVILLE...BRENTWOOD...BETHEL PARK AND BALDWIN
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
THE WATER DEPTH MAY BE TOO GREAT FOR SAFE PASSAGE.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
&&
LAT...LON 4039 7976 4030 7979 4028 7978 4028 7980
4026 7979 4024 7981 4023 7978 4020 7986
4017 7985 4015 7991 4023 8049 4041 8050
4053 8026 4040 7974
$$361
WGUS51 KPBZ 202056
FFWPBZ
PAC003-125-210000-
/O.EXT.KPBZ.FF.W.0009.000000T0000Z-120721T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
456 PM EDT FRI JUL 20 2012
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
SOUTHERN ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
NORTHERN WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...
* UNTIL 800 PM EDT
* AT 448 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLOODING
ON ROUTE 51 AT THE INTERSECTION WITH ROUTE 88...AND ALONG OTHER PARTS
OF ROUTE 51 IN THE SOUTH HILLS. ALSO, FLOODED HOMES AND BRIDGES WERE
REPORTED IN IMPERIAL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROAD. FLOOD WATER IS USUALLY DEEPER THAN
IT APPEARS...AND ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO
SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE...TURN AROUND...
DONT DROWN.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
LAT...LON 4039 7976 4030 7979 4028 7978 4028 7980
4026 7979 4024 7981 4023 7978 4020 7986
4017 7985 4015 7991 4023 8049 4041 8050
4053 8026 4040 7974
$$646
WGUS71 KPBZ 202257
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
657 PM EDT FRI JUL 20 2012
PAC003-125-202305-
/O.CAN.KPBZ.FF.W.0009.000000T0000Z-120721T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-WASHINGTON PA-
657 PM EDT FRI JUL 20 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WASHINGTON AND
ALLEGHENY COUNTIES...
THUNDERSTORMS HAVE MOVED OUT OF THE REGION AND THE FLOODING HAS
SUBSIDED. REPORTS SAY ALL ROADS HAVE BEEN REOPENED.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
LAT...LON 4039 7976 4030 7979 4028 7978 4028 7980
4026 7979 4024 7981 4023 7978 4020 7986
4017 7985 4015 7991 4023 8049 4041 8050
4053 8026 4040 7974
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:21 AM EDT | Special Weather Statement | PBZ | Allegheny, Washington, Westmoreland | 54 min |
| Jul 20, 6:02 AM EDT | Areal Flood Advisory | PBZ | Allegheny, Beaver, Fayette, Indiana, Washington, Westmoreland | 3 hr |
| Jul 20, 1:31 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Washington | 3 hr |
| Jul 20, 1:57 PM EDT | Flash Flood Watch | PBZ | Allegheny, Fayette, Greene, Washington, Westmoreland | 5 hr |
| Jul 20, 4:11 PM EDT | Flash Flood Warning | PBZ | Fayette, Washington, Westmoreland | 3 hr |
| Jul 20, 5:34 PM EDT | Areal Flood Advisory | PBZ | Fayette, Greene | 88 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2012Every flash flood warning in 2012
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.