Alert archive / Maryland / Flash Flood Warnings in 1990

Flash Flood Warning 29, NWS Baltimore/Washington

October 23, 1990Montgomery County, Maryland; Fairfax County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Oct 23, 1990, 9:50 AM EDT for Montgomery County, Maryland; Fairfax County, Virginia. It was in force for 70 min.

The area

The counties it named.

The facts

Issued
Oct 23, 1990, 9:50 AM EDT (13:50 UTC)
Expired
Oct 23, 1990, 11:00 AM EDT
In force
70 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

Counties Montgomery County, MD, Fairfax County, VA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 1.8 hours before the alert went out and 14 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 1990-10-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 345 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1990-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 206 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
345 J/kg
Mixed-layer CIN
-493 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
206 m²/s²
0-3 km storm-relative helicity
234 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
Oct 23, 6:45 AM EDTFlash Flood WarningLWXMontgomery3 hr
Oct 23, 6:28 AM EDTFlash Flood WarningLWXMadison, Page, Rappahannock, Warren3 hr
Oct 23, 6:28 AM EDTFlash Flood WarningLWXGreene3 hr
Oct 23, 6:28 AM EDTFlash Flood WarningLWXShenandoah3 hr
Oct 23, 6:45 AM EDTFlash Flood WarningLWXPrince William, Stafford3 hr
Oct 23, 6:45 AM EDTFlash Flood WarningLWXCity of Fairfax3 hr
Oct 23, 9:50 AM EDTFlash Flood WarningLWXPrince William70 min
Oct 23, 9:50 AM EDTFlash Flood WarningLWXCity of Fairfax70 min

Nearby

Flash Flood Warnings in Maryland, 1990Flash Flood Warnings in Virginia, 1990Every flash flood warning in 1990

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.