Alert archive / Virginia / Flash Flood Warnings in 1991

Flash Flood Warning 2, NWS Baltimore/Washington

March 23, 1991Shenandoah County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Mar 23, 1991, 9:33 AM EST for Shenandoah County, Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Mar 23, 1991, 9:33 AM EST (14:33 UTC)
Expired
Mar 23, 1991, 12:30 PM EST
In force
3 hr
Issued by
NWS Baltimore/Washington
Area
Whole counties

County Shenandoah County, VA

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 2.6 hours before the alert went out and 217 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 1991-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 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 1991-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 538 square meters per square second.1939587897117136Sfc1 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
48 J/kg
Mixed-layer CIN
-182 J/kg
Mixed-layer LCL
832 m above ground
0-6 km bulk shear
96 kt
0-1 km storm-relative helicity
538 m²/s²
0-3 km storm-relative helicity
524 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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
Mar 23, 10:15 AM ESTSevere Thunderstorm WarningLWXMontgomery45 min
Mar 23, 10:34 AM ESTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Howard, City of Baltimore56 min
Mar 23, 10:34 AM ESTSevere Thunderstorm WarningLWXCecil56 min
Mar 23, 11:04 AM ESTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Howard, City of Baltimore116 min
Mar 23, 11:04 AM ESTSevere Thunderstorm WarningLWXCecil, Harford116 min
Mar 23, 5:52 PM ESTSevere Thunderstorm WarningLWXSomerset68 min
Mar 23, 6:06 PM ESTSevere Thunderstorm WarningLWXWorcester69 min
Mar 23, 10:00 AM ESTFlash Flood WarningLWXClarke, Fauquier, Frederick, Warren3 hr
Mar 23, 10:00 AM ESTFlash Flood WarningLWXMadison, Page, Rappahannock3 hr
Mar 23, 10:00 AM ESTFlash Flood WarningLWXCulpeper3 hr

Nearby

Flash Flood Warnings in Virginia, 1991Every flash flood warning in 1991

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.