Alert archive / North Carolina / Flash Flood Watches in 2016

Flash Flood Watch 2, NWS Wakefield, VA

September 20, 20164 counties in Virginia; 9 counties in North Carolina

NWS Wakefield, VA issued this flash flood watch at Sep 20, 2016, 3:28 AM EDT for 4 counties in Virginia; 9 counties in North Carolina. It was in force for 48 hr.

The area

The counties it named.

The facts

Issued
Sep 20, 2016, 3:28 AM EDT (07:28 UTC)
Expired
Sep 22, 2016, 3:19 AM EDT
In force
48 hr
Issued by
NWS Wakefield, VA
Flood severity
None

Counties Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, City of Chesapeake, VA, City of Franklin, VA, City of Virginia Beach, VA, Southampton County, VA

The radar

The Norfolk radar (KAKQ), 73 km from the middle of the area, began a volume at 07:32 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

Newport, NC (KMHX), launched 00:00Z, 7.5 hours before the alert went out and 184 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, Newport, NC at 00:00Z on 2016-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Newport, NC at 00:00Z on 2016-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -105 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1190 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-105 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 Wakefield, VA wrote its last area forecast discussion before this flash flood watch went out at Sep 20, 2:30 AM EDT, 58 minutes earlier.

Area forecast discussion, Sep 20, 2:30 AM EDT, 58 minutes before
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Hazardous weather outlook, Sep 20, 3:01 AM EDT, 27 minutes before
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In the hours before

Local storm report, Sep 19, 11:13 PM EDT, 4 hours 15 minutes before
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Local storm report, Sep 19, 11:18 PM EDT, 4 hours 10 minutes before
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Local storm report, Sep 19, 11:25 PM EDT, 4 hours 3 minutes before
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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 3:52 AM EDTBeach Hazards StatementAKQCity of Virginia Beach39 hr
Sep 20, 3:58 AM EDTSmall Craft AdvisoryAKQ71 hr
Sep 20, 3:08 PM EDTSpecial Weather StatementAKQCity of Chesapeake52 min
Sep 20, 4:50 PM EDTSpecial Weather StatementAKQIsle of Wight, Surry, York, City of Newport News, City of Williamsburg40 min
Sep 20, 7:07 PM EDTSpecial Weather StatementAKQCity of Chesapeake, City of Norfolk, City of Portsmouth, City of Suffolk, City of Virginia Beach53 min
Sep 19, 9:11 PM EDTSpecial Weather StatementAKQCurrituck49 min
Sep 20, 1:54 PM EDTSpecial Weather StatementAKQCamden, Pasquotank, Perquimans51 min
Sep 20, 2:50 PM EDTSpecial Weather StatementAKQChowan, Pasquotank, Perquimans55 min
Sep 20, 4:02 PM EDTSpecial Weather StatementAKQBertie, Chowan, Pasquotank, Perquimans43 min
Sep 20, 4:25 PM EDTSpecial Weather StatementAKQCamden, Currituck65 min
Sep 20, 5:27 PM EDTSpecial Weather StatementAKQCamden, Currituck, Pasquotank63 min

Nearby

Flash Flood Watches in North Carolina, 2016Flash Flood Watches in Virginia, 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.