Alert archive / Pennsylvania / Flash Flood Watches in 2011

Flash Flood Watch 4, NWS Pittsburgh, PA

May 14, 201114 counties in Pennsylvania; 9 counties in Ohio; 4 counties in West Virginia

NWS Pittsburgh, PA issued this flash flood watch at May 14, 2011, 4:10 AM EDT for 14 counties in Pennsylvania; 9 counties in Ohio; 4 counties in West Virginia. It took effect at May 14, 2011, 2:00 PM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: May 14, 2011, 4:10 AM EDT (08:10 UTC)
In effect from: May 14, 2011, 2:00 PM EDT
Expired: May 14, 2011, 11:51 PM EDT
In force: 10 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

All 27 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Muskingum County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 17 km from the middle of the area, began a volume at 08:10 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 (KPIT), launched 00:00Z, 8.2 hours before the alert went out and 30 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: 100 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 14, 1:39 AM EDT, 2 hours 31 minutes earlier.

Area forecast discussion, May 14, 1:39 AM EDT, 2 hours 31 minutes before

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Hazardous weather outlook, May 13, 9:43 PM EDT, 6 hours 27 minutes before

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In the hours before

Local storm report, May 13, 10:16 PM EDT, 5 hours 54 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
May 14, 6:49 PM EDT	Special Weather Statement	PBZ	Allegheny, Washington	41 min
May 14, 7:48 PM EDT	Special Weather Statement	PBZ	Fayette	42 min
May 14, 4:27 PM EDT	Special Weather Statement	PBZ	Muskingum	63 min
May 14, 6:45 PM EDT	Special Weather Statement	PBZ	Harrison	45 min
May 14, 7:46 PM EDT	Special Weather Statement	PBZ	Carroll, Columbiana	59 min
May 13, 8:12 PM EDT	Areal Flood Advisory	PBZ	Monongalia	118 min
May 14, 7:32 PM EDT	Special Weather Statement	PBZ	Brooke, Hancock	43 min

Nearby

Flash Flood Watches in Pennsylvania, 2011 Flash Flood Watches in Ohio, 2011 Flash Flood Watches in West Virginia, 2011 Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.