Alert archive / Pennsylvania / Flash Flood Warnings in 2016

Flash Flood Warning 21, NWS Pittsburgh, PA

August 11, 2016Armstrong County, Butler County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Aug 11, 2016, 7:03 PM EDT for Armstrong County, Butler County, Pennsylvania. It was in force for 3 hr. 1 report 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: Aug 11, 2016, 7:03 PM EDT (23:03 UTC)
Expired: Aug 11, 2016, 10:00 PM EDT
In force: 3 hr
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: None

Counties Armstrong County, PA, Butler County, PA

The radar

The Pittsburgh radar (KPBZ), 69 km from the middle of the area, began a volume at 23:05 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
Aug 11, 7:30 PM EDT	FLASH FLOOD	Adams, PA	SUGAR CREEK AMBULANCE STATION FLOODED

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 11.1 hours before the alert went out and 73 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1056 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 906 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

795 
WGUS51 KPBZ 112303
FFWPBZ
PAC005-019-120200-
/O.NEW.KPBZ.FF.W.0021.160811T2303Z-160812T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
703 PM EDT THU AUG 11 2016

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL ARMSTRONG COUNTY IN WEST CENTRAL PENNSYLVANIA...
  EAST CENTRAL BUTLER COUNTY IN WEST CENTRAL PENNSYLVANIA...

* UNTIL 1000 PM EDT

* AT 702 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHICORA AND EAST BRADY. 

PLEASE REPORT FLOODING BY CALLING 4 1 2...2 6 2...1 9 8 8...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4086 7955 4085 7979 4096 7980 4101 7960
      4100 7959 4100 7958 4099 7959 4099 7961
      4098 7963 4097 7959 4099 7957 4098 7954

$$

1 follow-up statement

502 
WGUS71 KPBZ 120037
FFSPBZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
837 PM EDT THU AUG 11 2016

PAC005-019-120046-
/O.CAN.KPBZ.FF.W.0021.000000T0000Z-160812T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ARMSTRONG PA-BUTLER PA-
837 PM EDT THU AUG 11 2016

...THE FLASH FLOOD WARNING FOR WEST CENTRAL ARMSTRONG AND EAST
CENTRAL BUTLER COUNTIES IS CANCELLED...

HEAVY RAIN HAS ENDED AND FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4086 7955 4085 7979 4096 7980 4101 7960
      4100 7959 4100 7958 4099 7959 4099 7961
      4098 7963 4097 7959 4099 7957 4098 7954

$$

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 2:25 PM EDT	Special Weather Statement	PBZ	Mercer	35 min
Aug 11, 3:32 PM EDT	Special Weather Statement	PBZ	Mercer	28 min
Aug 11, 5:00 PM EDT	Special Weather Statement	PBZ	Beaver	45 min
Aug 11, 5:29 PM EDT	Special Weather Statement	PBZ	Lawrence, Mercer	46 min
Aug 11, 5:46 PM EDT	Special Weather Statement	PBZ	Beaver	44 min
Aug 11, 6:07 PM EDT	Special Weather Statement	PBZ	Clarion	38 min
Aug 11, 7:28 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	62 min
Aug 11, 7:46 PM EDT	Special Weather Statement	PBZ	Forest	44 min
Aug 11, 7:52 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	53 min
Aug 11, 7:56 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	49 min

Nearby

Flash Flood Warnings in Pennsylvania, 2016 Every flash flood warning in 2016

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.