Alert archive / Maryland / Flash Flood Warnings in 1999

Flash Flood Warning 39, NWS Baltimore/Washington

September 16, 19995 counties in Maryland

NWS Baltimore/Washington issued this flash flood warning at Sep 16, 1999, 4:05 PM EDT for 5 counties in Maryland. 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 16, 1999, 4:05 PM EDT (20:05 UTC)
Expired
Sep 16, 1999, 7:00 PM EDT
In force
3 hr
Issued by
NWS Baltimore/Washington
Area
Whole counties

Counties Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 80 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 1999-09-16Temperature 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 1999-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
577 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
268 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
Sep 16, 8:04 AM EDTFlash Flood WarningLWXKing George, Stafford8 hr
Sep 16, 8:04 AM EDTFlash Flood WarningLWXSpotsylvania8 hr
Sep 16, 11:25 AM EDTFlash Flood WarningLWXArlington, Fairfax, City of Alexandria, City of Falls Church5 hr
Sep 16, 11:25 AM EDTFlash Flood WarningLWXPrince William, City of Manassas, City of Manassas Park5 hr
Sep 16, 11:25 AM EDTFlash Flood WarningLWXCity of Fairfax5 hr
Sep 16, 8:04 AM EDTFlash Flood WarningLWXAnne Arundel, Calvert, Charles, Prince George's8 hr
Sep 16, 8:04 AM EDTFlash Flood WarningLWXSaint Mary's8 hr
Sep 16, 8:04 AM EDTFlash Flood WarningLWXBaltimore, City of Baltimore8 hr
Sep 16, 8:04 AM EDTFlash Flood WarningLWXHarford8 hr
Sep 16, 11:25 AM EDTFlash Flood WarningLWXCarroll, Howard5 hr
Sep 16, 4:05 PM EDTFlash Flood WarningLWXAnne Arundel, Calvert, Prince George's3 hr

Nearby

Flash Flood Warnings in Maryland, 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.