Alert archive / Ohio / Flood Watches in 2007

Flood Watch 4, NWS Pittsburgh, PA

March 23, 2007Allegheny County, Greene County, Washington County, Pennsylvania; 10 counties in Ohio; 6 counties in West Virginia

NWS Pittsburgh, PA issued this flood watch at Mar 23, 2007, 7:07 AM EDT for Allegheny County, Greene County, Washington County, Pennsylvania; 10 counties in Ohio; 6 counties in West Virginia. It took effect at Mar 23, 2007, 8:00 AM EDT. It was in force for 27 hr.

The area

The counties it named.

The facts

Issued: Mar 23, 2007, 7:07 AM EDT (11:07 UTC)
In effect from: Mar 23, 2007, 8:00 AM EDT
Expired: Mar 24, 2007, 11:10 AM EDT
In force: 27 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

Counties Belmont County, OH, Carroll 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, Greene County, PA, Washington 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), 75 km from the middle of the area, began a volume at 11:10 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.1 hours before the alert went out and 259 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: 162 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 740 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

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 Mar 23, 2:20 AM EDT, 4 hours 47 minutes earlier.

Area forecast discussion, Mar 23, 2:20 AM EDT, 4 hours 47 minutes before

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Hazardous weather outlook, Mar 23, 5:25 AM EDT, 1 hour 42 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
Mar 23, 1:29 PM EDT	Flash Flood Warning	PBZ	Allegheny	91 min
Mar 23, 7:45 PM EDT	Flash Flood Warning	PBZ	Monongalia	4 hr

Nearby

Flood Watches in Ohio, 2007 Flood Watches in West Virginia, 2007 Flood Watches in Pennsylvania, 2007 Every flood watch in 2007

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.