Alert archive / Pennsylvania / Flood Watches in 2011

Flood Watch 2, NWS Pittsburgh, PA

February 27, 201114 counties in Pennsylvania; 11 counties in Ohio; 6 counties in West Virginia

NWS Pittsburgh, PA issued this flood watch at Feb 27, 2011, 2:59 AM EST for 14 counties in Pennsylvania; 11 counties in Ohio; 6 counties in West Virginia. It took effect at Feb 28, 2011, 1:00 AM EST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Feb 27, 2011, 2:59 AM EST (07:59 UTC)
In effect from: Feb 28, 2011, 1:00 AM EST
Expired: Feb 28, 2011, 2:49 PM EST
In force: 14 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

All 31 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Muskingum County, OH, Noble 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, Marion County, WV, Marshall County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 25 km from the middle of the area, began a volume at 08:00 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, 8.0 hours before the alert went out and 32 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 961 m above ground
0-6 km bulk shear: 90 kt
0-1 km storm-relative helicity: 373 m²/s²
0-3 km storm-relative helicity: 620 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 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 flood watch went out at Feb 26, 9:19 PM EST, 5 hours 40 minutes earlier.

Area forecast discussion, Feb 26, 9:19 PM EST, 5 hours 40 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
Feb 27, 10:46 AM EST	River Flood Advisory	PBZ	Allegheny	7 days
Feb 27, 10:39 AM EST	River Flood Watch	PBZ	Guernsey	18 hr

Nearby

Flood Watches in Pennsylvania, 2011 Flood Watches in Ohio, 2011 Flood Watches in West Virginia, 2011 Every 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.