Alert archive / Virginia / Flash Flood Warnings in 1999

Flash Flood Warning 13, NWS Wakefield, VA

September 7, 1999City of Chesapeake, City of Norfolk, City of Virginia Beach, Virginia

NWS Wakefield, VA issued this flash flood warning at Sep 7, 1999, 3:59 AM EDT for City of Chesapeake, City of Norfolk, City of Virginia Beach, Virginia. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 7, 1999, 3:59 AM EDT (07:59 UTC)
Expired
Sep 7, 1999, 7:00 AM EDT
In force
3 hr
Issued by
NWS Wakefield, VA
Area
Whole counties

Counties City of Chesapeake, VA, City of Norfolk, VA, City of Virginia Beach, VA

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 8.0 hours before the alert went out and 230 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 1999-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2271 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, Newport, NC at 00:00Z on 1999-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -68 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
2271 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
616 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-68 m²/s²
0-3 km storm-relative helicity
-38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 12:55 AM EDTFlash Flood WarningAKQCity of Suffolk3 hr
Sep 7, 12:55 AM EDTFlash Flood WarningAKQCity of Chesapeake, City of Norfolk, City of Portsmouth, City of Virginia Beach3 hr
Sep 7, 3:59 AM EDTFlash Flood WarningAKQCity of Suffolk3 hr
Sep 7, 3:59 AM EDTFlash Flood WarningAKQCity of Portsmouth3 hr
Sep 7, 3:58 PM EDTFlash Flood WarningAKQCity of Suffolk87 min
Sep 7, 4:28 PM EDTSevere Thunderstorm WarningAKQCity of Suffolk32 min
Sep 7, 5:22 PM EDTSevere Thunderstorm WarningAKQSurry33 min
Sep 7, 7:37 PM EDTSevere Thunderstorm WarningAKQLouisa63 min
Sep 7, 1:49 AM EDTFlash Flood WarningAKQBertie, Hertford3 hr
Sep 7, 3:59 AM EDTFlash Flood WarningAKQBertie3 hr
Sep 7, 5:01 AM EDTFlash Flood WarningAKQCamden, Pasquotank119 min
Sep 7, 7:06 AM EDTFlash Flood WarningAKQBertie, Gates, Hertford114 min
Sep 7, 7:06 AM EDTFlash Flood WarningAKQCamden, Pasquotank114 min

Nearby

Flash Flood Warnings in Virginia, 1999Every flash flood warning in 1999

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.