Alert archive / West Virginia / Flash Flood Watches in 2016

Flash Flood Watch 8, NWS Baltimore/Washington

July 3, 2016Highland County, Virginia; Allegany County, Maryland; 5 counties in West Virginia

NWS Baltimore/Washington issued this flash flood watch at Jul 3, 2016, 1:26 PM EDT for Highland County, Virginia; Allegany County, Maryland; 5 counties in West Virginia. It took effect at Jul 4, 2016, 8:00 AM EDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued
Jul 3, 2016, 1:26 PM EDT (17:26 UTC)
In effect from
Jul 4, 2016, 8:00 AM EDT
Expired
Jul 5, 2016, 3:57 AM EDT
In force
20 hr
Issued by
NWS Baltimore/Washington
Flood severity
None

Counties Allegany County, MD, Highland County, VA, Grant County, WV, Hampshire County, WV, Hardy County, WV, Mineral County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 134 km from the middle of the area, began a volume at 17:26 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

Roanoke, VA (KRNK), launched 12:00Z, 5.4 hours before the alert went out and 212 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, Roanoke, VA at 12:00Z on 2016-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 131 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, Roanoke, VA at 12:00Z on 2016-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 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
131 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
559 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 3, 2:35 PM EDTSmall Craft AdvisoryLWX44 hr

Nearby

Flash Flood Watches in West Virginia, 2016Flash Flood Watches in Virginia, 2016Flash Flood Watches in Maryland, 2016Every flash flood watch in 2016

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.