Alert archive / Maryland / Mesoscale Discussions in 2019

Mesoscale Discussion 892

May 29, 20196 counties in Maryland

The Storm Prediction Center issued this mesoscale discussion at May 29, 2019, 4:58 PM EDT for 6 counties in Maryland. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 29, 2019, 4:58 PM EDT (20:58 UTC)
Expired: May 29, 2019, 7:30 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD

The radar

The Sterling radar (KLWX), 65 km from the middle of the area, began a volume at 21:02 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, 9.0 hours before the alert went out and 61 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: 292 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 28, 8:07 PM EDT	Mesoscale Discussion	SPC	Baltimore, Caroline, Carroll, Cecil, Harford, Kent and 2 more	113 min
May 29, 11:52 AM EDT	Severe Thunderstorm Watch	SPC	Garrett	6 hr
May 29, 1:10 PM EDT	Tornado Watch	SPC	Cecil	8 hr
May 29, 3:47 PM EDT	Mesoscale Discussion	SPC	Cecil, Harford	118 min

Nearby

Mesoscale Discussions in Maryland, 2019 Every mesoscale discussion in 2019

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.