Alert archive / Pennsylvania / Flash Flood Watches in 2013

Flash Flood Watch 7, NWS Pittsburgh, PA

August 28, 2013Fayette County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood watch at Aug 28, 2013, 10:00 AM EDT for Fayette County, Westmoreland County, Pennsylvania. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Aug 28, 2013, 10:00 AM EDT (14:00 UTC)
Expired: Aug 28, 2013, 8:00 PM EDT
In force: 10 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

Counties Fayette County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 73 km from the middle of the area, began a volume at 14:04 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 (KAGC), launched 12:00Z, 2.0 hours before the alert went out and 57 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: 897 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this flash flood watch went out at Aug 28, 8:08 AM EDT, 1 hour 52 minutes earlier.

Area forecast discussion, Aug 28, 8:08 AM EDT, 1 hour 52 minutes before

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Hazardous weather outlook, Aug 28, 2:55 AM EDT, 7 hours 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 3:49 AM EDT	Areal Flood Advisory	PBZ	Allegheny, Beaver, Butler, Fayette, Westmoreland	6 hr
Aug 28, 11:01 AM EDT	Special Weather Statement	PBZ	Westmoreland	59 min
Aug 28, 11:23 AM EDT	Areal Flood Advisory	PBZ	Venango	4 hr
Aug 28, 11:53 AM EDT	Areal Flood Advisory	PBZ	Indiana, Westmoreland	3 hr
Aug 28, 12:00 PM EDT	Areal Flood Warning	PBZ	Venango	4 hr
Aug 28, 12:17 PM EDT	Areal Flood Warning	PBZ	Indiana, Westmoreland	7 hr
Aug 28, 1:28 PM EDT	Special Weather Statement	PBZ	Armstrong	62 min
Aug 28, 1:37 PM EDT	Areal Flood Warning	PBZ	Armstrong, Westmoreland	6 hr
Aug 28, 2:33 PM EDT	Areal Flood Warning	PBZ	Westmoreland	6 hr
Aug 28, 2:34 PM EDT	Special Weather Statement	PBZ	Westmoreland	56 min
Aug 28, 3:26 PM EDT	Areal Flood Advisory	PBZ	Fayette, Westmoreland	3 hr
Aug 28, 3:37 PM EDT	Areal Flood Warning	PBZ	Fayette, Westmoreland	4 hr
Aug 28, 3:42 PM EDT	Areal Flood Warning	PBZ	Armstrong, Butler, Clarion, Venango	3 hr
Aug 28, 3:46 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	44 min
Aug 28, 10:45 AM EDT	Areal Flood Advisory	PBZ	Preston	4 hr
Aug 28, 5:02 PM EDT	Areal Flood Warning	PBZ	Preston	4 hr

Nearby

Flash Flood Watches in Pennsylvania, 2013 Flash Flood Watches in West Virginia, 2013 Every flash flood watch in 2013

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.