Alert archive / Maryland / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 233, NWS Baltimore/Washington

October 9, 2015Baltimore County, Carroll County, Harford County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Oct 9, 2015, 4:31 PM EDT for Baltimore County, Carroll County, Harford County, Maryland. It was in force for 44 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
Oct 9, 2015, 4:31 PM EDT (20:31 UTC)
Expired
Oct 9, 2015, 5:15 PM EDT
In force
44 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

Counties Baltimore County, MD, Carroll County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 94 km from the middle of the area, began a volume at 20:34 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.5 hours before the alert went out and 90 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 2015-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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 2015-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
43 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
1203 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 9, 5:11 PM EDTSpecial Marine WarningLWX94 min
Oct 9, 6:16 PM EDTSpecial Marine WarningLWX59 min
Oct 9, 6:24 PM EDTSpecial Marine WarningLWX96 min
Oct 9, 7:08 PM EDTSpecial Marine WarningLWX67 min
Oct 9, 7:30 PM EDTSpecial Marine WarningLWX90 min
Oct 9, 7:51 PM EDTSpecial Marine WarningLWX54 min
Oct 9, 1:44 PM EDTCoastal Flood AdvisoryLWXAnne Arundel4 hr
Oct 9, 5:26 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Howard, City of Baltimore49 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2015Every severe thunderstorm warning in 2015

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; radar from the NEXRAD Level II archive.