Alert archive / Maryland / Mesoscale Discussions in 2018

Mesoscale Discussion 397

May 12, 2018Sussex County, Delaware; Caroline County, Talbot County, Maryland

The Storm Prediction Center issued this mesoscale discussion at May 12, 2018, 9:14 PM EDT for Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 12, 2018, 9:14 PM EDT (01:14 UTC)
Expired
May 12, 2018, 10:15 PM EDT
In force
61 min
Issued by
the Storm Prediction Center

Counties Sussex County, DE, Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 5 km from the middle of the area, began a volume at 01:15 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.2 hours before the alert went out and 95 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, Wallops Is Stn, VA at 00:00Z on 2018-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1641 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, Wallops Is Stn, VA at 00:00Z on 2018-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 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
1641 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
1626 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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.

IssuedProductOfficeCountiesLasted
May 13, 1:56 PM EDTMesoscale DiscussionSPCAllegany, Garrett2 hr
May 13, 4:28 PM EDTSevere Thunderstorm WatchSPCAllegany, Garrett, Washington7 hr
May 13, 7:00 PM EDTMesoscale DiscussionSPCCharles, Garrett60 min

Nearby

Mesoscale Discussions in Maryland, 2018Mesoscale Discussions in Delaware, 2018Every mesoscale discussion in 2018

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.