Alert archive / Maryland / Flash Flood Warnings in 1999

Flash Flood Warning 22, NWS Baltimore/Washington

September 9, 1999Howard County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Sep 9, 1999, 6:23 PM EDT for Howard County, Maryland. It was in force for 62 min. 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 9, 1999, 6:23 PM EDT (22:23 UTC)
Expired
Sep 9, 1999, 7:25 PM EDT
In force
62 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

County Howard County, MD

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.4 hours before the alert went out and 53 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 1999-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 60 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, Washington/Dulle, VA at 12:00Z on 1999-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
60 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
900 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 9, 3:36 PM EDTFlash Flood WarningLWXAugusta, City of Waynesboro94 min
Sep 9, 3:51 PM EDTSevere Thunderstorm WarningLWXAugusta, City of Waynesboro49 min
Sep 9, 4:27 PM EDTSevere Thunderstorm WarningLWXAlbemarle, City of Charlottesville63 min
Sep 9, 5:18 PM EDTFlash Flood WarningLWXAlbemarle92 min
Sep 9, 5:36 PM EDTFlash Flood WarningLWXGreene89 min
Sep 9, 5:51 PM EDTFlash Flood WarningLWXNelson94 min
Sep 9, 6:00 PM EDTSevere Thunderstorm WarningLWXMadison50 min
Sep 9, 6:04 PM EDTSevere Thunderstorm WarningLWXFairfax51 min
Sep 9, 6:41 PM EDTFlash Flood WarningLWXCulpeper, Rappahannock94 min
Sep 9, 6:50 PM EDTSevere Thunderstorm WarningLWXFairfax, Loudoun50 min
Sep 9, 5:42 PM EDTFlash Flood WarningLWXBaltimore, City of Baltimore63 min
Sep 9, 7:37 PM EDTFlash Flood WarningLWXBaltimore, Howard93 min
Sep 9, 7:37 PM EDTFlash Flood WarningLWXCity of Baltimore93 min
Sep 9, 7:54 PM EDTFlash Flood WarningLWXMontgomery91 min

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.