Alert archive / Ohio / Areal Flood Warnings in 2021

Areal Flood Warning 10, NWS Pittsburgh, PA

August 18, 2021Hancock County, West Virginia; 4 counties in Ohio

NWS Pittsburgh, PA issued this areal flood warning at Aug 18, 2021, 12:59 PM EDT for Hancock County, West Virginia; 4 counties in Ohio. It was in force for 113 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 18, 2021, 12:59 PM EDT (16:59 UTC)
Expired
Aug 18, 2021, 2:52 PM EDT
In force
113 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon
Flood severity
None

Counties Carroll County, OH, Columbiana County, OH, Harrison County, OH, Jefferson County, OH, Hancock County, WV

The radar

The Pittsburgh radar (KPBZ), 54 km from the middle of the area, began a volume at 17:02 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 12:00Z, 5.0 hours before the alert went out and 65 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2021-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 109 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2021-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
109 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
684 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
165 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 9:25 AM EDTAreal Flood AdvisoryPBZAllegheny, Beaver, Washington, Westmoreland5 hr
Aug 18, 2:56 PM EDTAreal Flood AdvisoryPBZArmstrong, Indiana, Westmoreland109 min
Aug 18, 8:59 AM EDTAreal Flood AdvisoryPBZBrooke, Hancock3 hr

Nearby

Areal Flood Warnings in Ohio, 2021Areal Flood Warnings in West Virginia, 2021Every areal flood warning in 2021

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.