Alert archive / Pennsylvania / Flash Flood Warnings in 2012
Flash Flood Warning 13, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Sep 27, 2012, 5:43 PM EDT for Allegheny County, Pennsylvania. It was in force for 85 min. 2 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 27, 2012, 5:43 PM EDT (21:43 UTC)
- Expired
- Sep 27, 2012, 7:08 PM EDT
- In force
- 85 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Allegheny County, PA
The radar
The Pittsburgh radar (KPBZ), 36 km from the middle of the area, began a volume at 21:44 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 27, 5:55 PM EDT | FLASH FLOOD | Pittsburgh, PA | 10 INCHES OF WATER ON NADINE ROAD |
| Sep 27, 6:15 PM EDT | FLASH FLOOD | Aspinwall, PA | ROADWAY BUCKLING DUE TO RAIN ON CENTER AVE |
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, 9.7 hours before the alert went out and 26 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
- 2 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
773
WGUS51 KPBZ 272143
FFWPBZ
PAC003-272345-
/O.NEW.KPBZ.FF.W.0013.120927T2143Z-120927T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
543 PM EDT THU SEP 27 2012
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
* UNTIL 745 PM EDT
* AT 540 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM NEAR DOWNTOWN PITTSBURGH...
MOVING EAST AT 20 MPH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES...SO DO NOT CROSS WATER COVERED BRIDGES...DIPS...OR
LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A
SMALL ONE...ON FOOT. MOVE UP TO HIGHER GROUND.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
&&
LAT...LON 4042 7971 4039 7975 4039 7976 4035 7978
4040 8009 4053 8009 4058 7977 4055 7977
4054 7972 4053 7970
$$3 follow-up statements
641
WGUS71 KPBZ 272150
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
550 PM EDT THU SEP 27 2012
PAC003-272345-
/O.CON.KPBZ.FF.W.0013.000000T0000Z-120927T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-
550 PM EDT THU SEP 27 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
ALLEGHENY COUNTY...
AT 544 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE SHOWERS AND ISOLATED THUNDERSTORMS PRODUCING VERY HEAVY
RAIN. THE LEADING EDGE OF THIS RAIN AREA WAS LOCATED ALONG A LINE
EXTENDING FROM PENN HILLS TO SOUTH SIDE PITTSBURGH...MOVING EAST AT
25 MPH. EXPECT A RAIN TOTAL OF ONE TO TWO INCHES.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SPRINGDALE...WILKINSBURG...PLUM...WEST MIFFLIN...TURTLE CREEK AND
MONROEVILLE.
FLOODING HAS ALREADY BEEN REPORTED IN BALDWIN...CLARION...AND
WILKINS TOWNSHIP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES...SO DO NOT CROSS WATER COVERED BRIDGES...DIPS...OR
LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A
SMALL ONE...ON FOOT. MOVE UP TO HIGHER GROUND.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
&&
LAT...LON 4042 7971 4039 7975 4039 7976 4035 7978
4040 8009 4053 8009 4058 7977 4055 7977
4054 7972 4053 7970
$$
15832
WGUS71 KPBZ 272223
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
623 PM EDT THU SEP 27 2012
PAC003-272345-
/O.CON.KPBZ.FF.W.0013.000000T0000Z-120927T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-
623 PM EDT THU SEP 27 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
ALLEGHENY COUNTY...
AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT HEAVY RAIN HAD EXITED ALLEGHENY COUNTY. HOWEVER...RUNOFF FROM
THE RAIN WILL CONTINUE FOR A COUPLE HOURS. NUMEROUS REPORTS OF
FLOODING IN POOR DRAINAGE AREAS...AND IN AREAS WHERE STORM DRAINS
WERE CLOGGED WERE RECEIVED. WATER WILL CONTINUE TO SLOWLY DRAIN AS
THE EVENING PROGRESSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES...SO DO NOT CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. MOVE UP TO
HIGHER GROUND.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
&&
LAT...LON 4042 7971 4039 7975 4039 7976 4035 7978
4040 8009 4053 8009 4058 7977 4055 7977
4054 7972 4053 7970
$$
15341
WGUS71 KPBZ 272308
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
708 PM EDT THU SEP 27 2012
PAC003-272317-
/O.CAN.KPBZ.FF.W.0013.000000T0000Z-120927T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-
708 PM EDT THU SEP 27 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR ALLEGHENY COUNTY...
THE THREAT OF HEAVY RAINFALL HAS ENDED AND MUCH OF THE PONDED WATER
HAS RUN OFF. SO...THE NATIONAL WEATHER HAS CANCELLED THE FLASH
FLOOD WARNING. A FLOOD ADVISORY REMAINS IN EFFECT FOR RESIDUAL
RUNOFF INTO POOR DRAINAGE AREAS.
PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772.
LAT...LON 4042 7971 4039 7975 4039 7976 4035 7978
4040 8009 4053 8009 4058 7977 4055 7977
4054 7972 4053 7970
$$
15The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 4:54 PM EDT | Special Weather Statement | PBZ | Allegheny | 36 min |
| Sep 27, 5:08 PM EDT | Special Weather Statement | PBZ | Allegheny, Beaver, Washington, Westmoreland | 52 min |
| Sep 27, 5:11 PM EDT | Special Weather Statement | PBZ | Allegheny, Westmoreland | 49 min |
| Sep 27, 5:17 PM EDT | Areal Flood Advisory | PBZ | Allegheny | 2 hr |
| Sep 27, 6:08 PM EDT | Special Weather Statement | PBZ | Indiana | 52 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.