Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 64, NWS Baltimore/Washington

June 3, 2020Harford County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 3, 2020, 8:47 PM EDT for Harford County, Maryland. It was in force for 28 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 3, 2020, 8:47 PM EDT (00:47 UTC)
Expired
Jun 3, 2020, 9:15 PM EDT
In force
28 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Harford County, MD

The radar

The Dover AFB radar (KDOX), 108 km from the middle of the area, began a volume at 00:46 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 00:00Z, 0.8 hours before the alert went out and 115 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 00:00Z on 2020-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 577 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 00:00Z on 2020-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 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
577 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
2240 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

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.

NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 3, 2:33 PM EDT, 6 hours 14 minutes earlier.

Area forecast discussion, Jun 3, 2:33 PM EDT, 6 hours 14 minutes before
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Hazardous weather outlook, Jun 3, 7:46 PM EDT, 1 hour 1 minute before
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 3:27 PM EDTSmall Craft AdvisoryLWX30 hr
Jun 4, 3:50 PM EDTSevere Thunderstorm WarningLWXAugusta, Nelson, City of Waynesboro40 min
Jun 4, 4:17 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson43 min
Jun 4, 4:22 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Staunton, City of Waynesboro20 min
Jun 4, 4:41 PM EDTSevere Thunderstorm WarningLWXFrederick49 min
Jun 4, 4:56 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Greene, Rockingham16 min
Jun 4, 5:05 PM EDTSevere Thunderstorm WarningLWXFrederick40 min
Jun 4, 5:07 PM EDTSevere Thunderstorm WarningLWXPage, Rappahannock, Shenandoah, Warren38 min
Jun 4, 5:09 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Culpeper, Greene, Madison, Orange, City of Charlottesville36 min
Jun 4, 5:38 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Culpeper, Greene, Madison, Orange16 min
Jun 4, 5:43 PM EDTSevere Thunderstorm WarningLWXRockingham, Shenandoah47 min
Jun 4, 5:45 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Madison, Page, Rappahannock, Warren45 min
Jun 4, 6:41 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William, Rappahannock34 min
Jun 4, 6:52 PM EDTSpecial Marine WarningLWX42 min
Jun 4, 6:55 PM EDTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William, City of Fairfax, City of Manassas and 1 more35 min
Jun 4, 7:02 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William43 min
Jun 4, 7:07 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William26 min
Jun 4, 7:23 PM EDTSpecial Marine WarningLWX67 min
Jun 4, 7:28 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Loudoun, Prince William, City of Alexandria, City of Fairfax and 1 more47 min
Jun 4, 7:52 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax38 min
Jun 4, 5:20 PM EDTSevere Thunderstorm WarningLWXAllegany, Washington40 min
Jun 4, 5:40 PM EDTSevere Thunderstorm WarningLWXWashington35 min
Jun 4, 6:02 PM EDTSevere Thunderstorm WarningLWXAllegany28 min
Jun 4, 7:56 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Harford34 min
Jun 4, 4:12 PM EDTSevere Thunderstorm WarningLWXGrant, Hampshire, Hardy, Mineral48 min
Jun 4, 7:03 PM EDTSevere Thunderstorm WarningLWXGrant, Hampshire, Hardy, Mineral29 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2020Every 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.