Alert archive / Virginia / Flash Flood Warnings in 1998

Flash Flood Warning 33, NWS Baltimore/Washington

February 4, 19986 counties in Virginia

NWS Baltimore/Washington issued this flash flood warning at Feb 4, 1998, 9:22 AM EST for 6 counties in Virginia. It was in force for 5 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
Feb 4, 1998, 9:22 AM EST (14:22 UTC)
Expired
Feb 4, 1998, 2:05 PM EST
In force
5 hr
Issued by
NWS Baltimore/Washington
Area
Whole counties

Counties City of Manassas, VA, Fairfax County, VA, Fauquier County, VA, Loudoun County, VA, Prince William County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 25 km from the middle of the area, began a volume at 14:24 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 2.4 hours before the alert went out and 24 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, Washington/Dulle, VA at 12:00Z on 1998-02-04Temperature 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, Washington/Dulle, VA at 12:00Z on 1998-02-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 370 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
370 m²/s²
0-3 km storm-relative helicity
474 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 Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 4, 7:52 AM ESTFlash Flood WarningLWXGreene, Madison, Orange4 hr
Feb 4, 7:52 AM ESTFlash Flood WarningLWXCulpeper4 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXArlington, City of Alexandria, City of Falls Church5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXCity of Fairfax5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXAlbemarle, City of Charlottesville5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXNelson5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXRappahannock5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXKing George5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXSpotsylvania, City of Fredericksburg5 hr
Feb 4, 11:51 AM ESTFlash Flood WarningLWXCulpeper, Greene, Madison, Orange6 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXFauquier, King George, Prince William, Spotsylvania, Stafford, City of Fredericksburg10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXAlbemarle, Nelson, City of Charlottesville10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXCity of Manassas10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXFairfax, City of Fairfax10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXArlington, City of Falls Church10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXRappahannock10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXLoudoun10 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXCity of Alexandria10 hr
Feb 4, 5:35 PM ESTFlash Flood WarningLWXCulpeper, Greene, Madison, Orange6 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXAnne Arundel, Howard, Montgomery, Prince George's5 hr
Feb 4, 9:22 AM ESTFlash Flood WarningLWXCalvert, Charles, Saint Mary's5 hr
Feb 4, 2:00 PM ESTFlash Flood WarningLWXAnne Arundel, Calvert, Charles, Saint Mary's10 hr

Nearby

Flash Flood Warnings in Virginia, 1998Every flash flood warning in 1998

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.