Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 151, NWS Baltimore/Washington

June 28, 2020Baltimore County, Carroll County, Howard County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 28, 2020, 4:21 PM EDT for Baltimore County, Carroll County, Howard County, Maryland. It was in force for 17 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: Jun 28, 2020, 4:21 PM EDT (20:21 UTC)
Expired: Jun 28, 2020, 4:38 PM EDT
In force: 17 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Baltimore County, MD, Carroll County, MD, Howard County, MD

The radar

The Sterling radar (KLWX), 73 km from the middle of the area, began a volume at 20:22 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, 8.4 hours before the alert went out and 70 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 106 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1209 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

Hazardous weather outlook, Jun 27, 7:01 PM EDT, 21 hours 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 5:23 PM EDT	Special Marine Warning	LWX		67 min
Jun 28, 5:44 PM EDT	Special Marine Warning	LWX		61 min
Jun 28, 5:33 PM EDT	Severe Thunderstorm Warning	LWX	Harford	42 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2020 Every severe thunderstorm warning in 2020

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.