Alert archive / Pennsylvania / Flash Flood Warnings in 2011
Flash Flood Warning 2, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Feb 28, 2011, 8:04 AM EST for Allegheny County, Pennsylvania. It was in force for 4 hr. 3 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
- Feb 28, 2011, 8:04 AM EST (13:04 UTC)
- Expired
- Feb 28, 2011, 11:50 AM EST
- In force
- 4 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Allegheny County, PA
The radar
The Pittsburgh radar (KPBZ), 31 km from the middle of the area, began a volume at 13:05 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 28, 8:57 AM EST | FLOOD | Tarentum, PA | BULL CREEK IS OUT OF ITS BANKS AND CAUSING FLOODING IN A NUMBER OF BUILDINGS. |
| Feb 28, 10:30 AM EST | FLOOD | Pittsburgh, PA | ROUTE 28 NORTHBOUND CLOSED DUE TO FLOODING BETWEEN 31ST AND 40TH STREET BRIDGES |
| Feb 28, 11:00 AM EST | FLASH FLOOD | Ross Township, PA | MCKNIGHT ROAD CLOSED FOR 3 HOURS - WATER LIFTED MAHOLE COVERS FROM 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, 1.1 hours before the alert went out and 18 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
- 150 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 333 m²/s²
- 0-3 km storm-relative helicity
- 386 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
742
WGUS51 KPBZ 281304
FFWPBZ
PAC003-281700-
/O.NEW.KPBZ.FF.W.0002.110228T1304Z-110228T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
804 AM EST MON FEB 28 2011
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
* FLASH FLOOD WARNING FOR...
ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
* UNTIL NOON EST
* AT 756 AM EST... RUNOFF FROM HEAVY RAINS IS CAUSING FLASH FLOODING
ACROSS ALLEGHENY COUNTY. GIRTYS RUN IN THE ETNA AREA HAS RISEN 3
FEET OVER THE PAST 30 MINUTES. HEAVY RAIN IN THE LITTLE PINE CREEK
AND DEEK CREEK WATERSHED IS CAUSING RAPID RISES. FLOODING WAS ALSO
REPORTED IN THE ROSS TOWNSHIP AREA WITH ROADS CLOSED. MANY ROADWAYS
AND BASEMENTS ARE FLOODED IN WEST DEER TOWENSHIP. FLASH FLOODING
IS LIKELY ACROSS ALL OF ALLEGHENY COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATER IS USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS 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 4062 7971 4059 7978 4056 7978 4053 7971
4043 7971 4038 7977 4030 7981 4029 7978
4022 7980 4021 7982 4020 7991 4022 7997
4024 7997 4025 7993 4033 8018 4048 8036
4062 8015 4067 8014 4066 7970
$$2 follow-up statements
390
WGUS71 KPBZ 281351
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
851 AM EST MON FEB 28 2011
PAC003-281700-
/O.CON.KPBZ.FF.W.0002.000000T0000Z-110228T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-
851 AM EST MON FEB 28 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL NOON EST FOR
ALLEGHENY COUNTY...
AT 850 AM EST...RUNOFF FROM HEAVY RAINS CONTINUE TO CAUSE FLASH
FLOODING ACROSS ALLEGHENY COUNTY. MT NEBO ROAD IN OHIO TOWNSHIP IS
FLOODED. ROADWAY FLOODING IS REPORTED IN RICHLAND AND SPRINGDALE
TOWNSHIP. BASEMENT FLOODING WAS REPORTED IN SHALER...EMSWORTH AND
FOX CHAPEL. FLOODING WAS ALSO REPORTED IN THE BELLEVUE AREA AND
TARENTUM. GIRTYS RUN HAS RISEN 5 FEET SINCE 7 AM. THE STAGE ON PINE
CREEK IN THE ETNA AREA HAS RISEN TO 12 FEET. FLOODING WILL OCCUR
ALONG PINE CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 4062 7971 4059 7978 4056 7978 4053 7971
4043 7971 4038 7977 4030 7981 4029 7978
4022 7980 4021 7982 4020 7991 4022 7997
4024 7997 4025 7993 4033 8018 4048 8036
4062 8015 4067 8014 4066 7970
$$788
WGUS71 KPBZ 281650
FFSPBZ
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1150 AM EST MON FEB 28 2011
PAC003-281657-
/O.CAN.KPBZ.FF.W.0002.000000T0000Z-110228T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGHENY PA-
1150 AM EST MON FEB 28 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR ALLEGHENY COUNTY...
THE FLASH FLOOD WARNING HAS BEEN CANCELED FOR ALLEGHENY COUNTY. THE
THREAT FOR FLASH FLOODING HAS ENDED...BUT THIS DOES NOT MEAN THAT
FLOODING IS OVER. AN AREAL FLOOD WARNING IS STILL IN EFFECT
THOUGHOUT THE COUNTY AS FLOODING CONTINUES IN MANY AREAS.
LAT...LON 4062 7971 4059 7978 4056 7978 4053 7971
4043 7971 4038 7977 4030 7981 4029 7978
4022 7980 4021 7982 4020 7991 4022 7997
4024 7997 4025 7993 4033 8018 4048 8036
4062 8015 4067 8014 4066 7970
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 8:34 PM EST | Special Weather Statement | PBZ | Greene | 56 min |
| Feb 27, 9:04 PM EST | Special Weather Statement | PBZ | Beaver, Washington | 56 min |
| Feb 27, 9:34 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Greene, Washington, Westmoreland | 41 min |
| Feb 27, 10:03 PM EST | Special Weather Statement | PBZ | Allegheny, Beaver, Butler, Lawrence, Westmoreland | 57 min |
| Feb 28, 2:00 AM EST | Special Weather Statement | PBZ | Armstrong, Beaver, Butler, Clarion, Forest, Jefferson and 3 more | 60 min |
| Feb 28, 3:18 AM EST | Special Weather Statement | PBZ | Armstrong, Beaver, Butler, Clarion, Forest, Jefferson and 3 more | 57 min |
| Feb 28, 4:16 AM EST | Areal Flood Warning | PBZ | Forest, Mercer, Venango | 20 hr |
| Feb 28, 4:33 AM EST | Special Weather Statement | PBZ | Beaver, Butler, Lawrence, Washington | 27 min |
| Feb 28, 5:17 AM EST | Areal Flood Warning | PBZ | Beaver, Butler, Lawrence | 20 hr |
| Feb 28, 5:23 AM EST | Special Weather Statement | PBZ | Lawrence, Mercer | 22 min |
| Feb 28, 5:44 AM EST | Special Weather Statement | PBZ | Armstrong, Beaver, Butler, Lawrence, Mercer | 61 min |
| Feb 28, 6:01 AM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Westmoreland | 29 min |
| Feb 28, 6:32 AM EST | Special Weather Statement | PBZ | Allegheny, Armstrong, Clarion, Indiana, Jefferson, Westmoreland | 28 min |
| Feb 28, 6:39 AM EST | Areal Flood Warning | PBZ | Clarion, Jefferson | 15 hr |
| Feb 28, 6:45 AM EST | Special Weather Statement | PBZ | Greene, Washington | 60 min |
| Feb 28, 6:46 AM EST | Areal Flood Warning | PBZ | Allegheny, Westmoreland | 11 hr |
| Feb 28, 7:24 AM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Greene, Washington, Westmoreland | 51 min |
| Feb 28, 8:14 AM EST | Areal Flood Warning | PBZ | Armstrong, Indiana, Westmoreland | 10 hr |
| Feb 28, 10:19 AM EST | Areal Flood Warning | PBZ | Fayette | 6 hr |
| Feb 28, 10:52 AM EST | River Flood Watch | PBZ | Allegheny | 30 hr |
| Feb 28, 10:52 AM EST | River Flood Watch | PBZ | Allegheny | 30 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2011Every flash flood warning in 2011
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.