Alert archive / West Virginia / Flash Flood Watches in 2018

Flash Flood Watch 3, NWS Pittsburgh, PA

May 15, 20185 counties in Pennsylvania; Belmont County, Monroe County, Noble County, Ohio; 8 counties in West Virginia

NWS Pittsburgh, PA issued this flash flood watch at May 15, 2018, 2:42 AM EDT for 5 counties in Pennsylvania; Belmont County, Monroe County, Noble County, Ohio; 8 counties in West Virginia. It took effect at May 15, 2018, 1:00 PM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: May 15, 2018, 2:42 AM EDT (06:42 UTC)
In effect from: May 15, 2018, 1:00 PM EDT
Expired: May 15, 2018, 10:37 PM EDT
In force: 10 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

Counties Belmont County, OH, Monroe County, OH, Noble County, OH, Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Preston County, WV, Tucker County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 75 km from the middle of the area, began a volume at 06:42 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 00:00Z, 6.7 hours before the alert went out and 64 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: 1406 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 374 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 15, 12:08 AM EDT, 2 hours 34 minutes earlier.

Area forecast discussion, May 15, 12:08 AM EDT, 2 hours 34 minutes before

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Hazardous weather outlook, May 14, 8:20 PM EDT, 6 hours 22 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 15, 11:44 AM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	46 min
May 15, 11:56 AM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	34 min
May 15, 12:13 PM EDT	Special Weather Statement	PBZ	Jefferson	32 min
May 15, 12:23 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	52 min
May 15, 12:45 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	45 min
May 15, 1:20 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	14 min
May 15, 11:03 AM EDT	Special Weather Statement	PBZ	Columbiana	42 min
May 15, 11:09 AM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	36 min
May 15, 5:58 PM EDT	Special Weather Statement	PBZ	Monroe, Noble	47 min
May 15, 6:17 PM EDT	Severe Thunderstorm Warning	PBZ	Monroe, Noble	43 min
May 15, 6:55 PM EDT	Severe Thunderstorm Warning	PBZ	Monroe	35 min
May 15, 7:21 PM EDT	Severe Thunderstorm Warning	PBZ	Marion, Wetzel	54 min

Nearby

Flash Flood Watches in West Virginia, 2018 Flash Flood Watches in Pennsylvania, 2018 Flash Flood Watches in Ohio, 2018 Every flash flood watch in 2018

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.