Alert archive / Maryland / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 99, NWS Baltimore/Washington

August 17, 1997Anne Arundel County, Howard County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 17, 1997, 7:45 PM EDT for Anne Arundel County, Howard County, Maryland. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 17, 1997, 7:45 PM EDT (23:45 UTC)
Expired
Aug 17, 1997, 8:15 PM EDT
In force
30 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

Counties Anne Arundel County, MD, Howard County, MD

What was reported inside it

TimeReportWhereRemark
Aug 17, 8:00 PM EDTThunderstorm WindLinthicum Hgts, MD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 17, 4:30 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 17, 6:00 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.8 hours before the alert went out and 59 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 1997-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 129 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 1997-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -40 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
129 J/kg
Mixed-layer CIN
-282 J/kg
Mixed-layer LCL
1590 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-40 m²/s²
0-3 km storm-relative helicity
37 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
Aug 17, 5:17 PM EDTSevere Thunderstorm WarningLWXFrederick48 min
Aug 17, 5:29 PM EDTSevere Thunderstorm WarningLWXFairfax46 min
Aug 17, 6:06 PM EDTSevere Thunderstorm WarningLWXArlington49 min
Aug 17, 6:59 PM EDTSevere Thunderstorm WarningLWXFairfax, Prince William46 min
Aug 17, 5:25 PM EDTSevere Thunderstorm WarningLWXHoward, Montgomery35 min
Aug 17, 5:50 PM EDTSevere Thunderstorm WarningLWXWashington50 min
Aug 17, 6:43 PM EDTSevere Thunderstorm WarningLWXFrederick47 min
Aug 17, 6:53 PM EDTSevere Thunderstorm WarningLWXHoward, Montgomery47 min
Aug 17, 7:10 PM EDTSevere Thunderstorm WarningLWXCarroll50 min
Aug 17, 7:34 PM EDTSevere Thunderstorm WarningLWXBaltimore, City of Baltimore46 min
Aug 17, 4:46 PM EDTSevere Thunderstorm WarningLWXMineral34 min
Aug 17, 4:55 PM EDTSevere Thunderstorm WarningLWXHampshire45 min

Nearby

Severe Thunderstorm Warnings in Maryland, 1997Every severe thunderstorm warning in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.