Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 90, NWS Baltimore/Washington

June 4, 2020Loudoun County, Virginia; Frederick County, Montgomery County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 4, 2020, 10:10 PM EDT for Loudoun County, Virginia; Frederick County, Montgomery County, Maryland. It was in force for 25 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 4, 2020, 10:10 PM EDT (02:10 UTC)
Expired: Jun 4, 2020, 10:35 PM EDT
In force: 25 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Frederick County, MD, Montgomery County, MD, Loudoun County, VA

The radar

The Sterling radar (KLWX), 29 km from the middle of the area, began a volume at 02:11 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.

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 4, 10:02 PM EDT, 8 minutes earlier.

Area forecast discussion, Jun 4, 10:02 PM EDT, 8 minutes before

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Hazardous weather outlook, Jun 4, 9:57 PM EDT, 13 minutes before

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In the hours before

Local storm report, Jun 4, 9:18 PM EDT, 52 minutes before

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    <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.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Jun 4, 9:20 PM EDT, 50 minutes before

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      <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.
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      <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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Local storm report, Jun 4, 9:22 PM EDT, 48 minutes before

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<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.
      </p>
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Local storm report, Jun 4, 9:34 PM EDT, 36 minutes before

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</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.
      </p>
    </section>
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Local storm report, Jun 4, 9:36 PM EDT, 34 minutes before

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<head>
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</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.
      </p>
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  </main>
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Local storm report, Jun 4, 9:58 PM EDT, 12 minutes before

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  <title>Service Notice</title>
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<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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 8:01 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria	44 min
Jun 4, 8:24 PM EDT	Special Marine Warning	LWX		96 min
Jun 4, 8:27 PM EDT	Special Marine Warning	LWX		33 min
Jun 4, 8:38 PM EDT	Special Marine Warning	LWX		97 min
Jun 4, 10:34 PM EDT	Special Marine Warning	LWX		41 min
Jun 4, 10:44 PM EDT	Areal Flood Warning	LWX	Page, Rockingham, Shenandoah	6 hr
Jun 4, 10:51 PM EDT	Flash Flood Watch	LWX	Arlington, Culpeper, Fairfax, Fauquier, Greene, Loudoun and 11 more	4 hr
Jun 4, 11:27 PM EDT	Areal Flood Warning	LWX	Arlington, Fairfax, Prince William, City of Alexandria, City of Fairfax, City of Falls Church and 2 more	6 hr
Jun 5, 3:40 AM EDT	Flash Flood Watch	LWX	Albemarle, Amherst, Arlington, Augusta, Clarke, Culpeper and 27 more	17 hr
Jun 5, 5:34 AM EDT	Areal Flood Warning	LWX	Fairfax	2 hr
Jun 5, 2:20 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	27 min
Jun 5, 2:21 PM EDT	Special Marine Warning	LWX		33 min
Jun 5, 3:18 PM EDT	Areal Flood Warning	LWX	Clarke, Frederick, City of Winchester	116 min
Jun 5, 3:19 PM EDT	Severe Thunderstorm Warning	LWX	Madison, Page, Rockingham, Shenandoah	41 min
Jun 5, 5:59 PM EDT	Special Marine Warning	LWX		72 min
Jun 5, 6:37 PM EDT	Special Marine Warning	LWX		38 min
Jun 5, 6:53 PM EDT	Special Marine Warning	LWX		41 min
Jun 4, 8:50 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	40 min
Jun 5, 1:12 AM EDT	Areal Flood Warning	LWX	Anne Arundel, Prince George's	3 hr
Jun 5, 3:38 AM EDT	Coastal Flood Advisory	LWX	Anne Arundel	5 hr
Jun 5, 4:21 PM EDT	Areal Flood Warning	LWX	Baltimore, Harford	13 hr
Jun 5, 4:28 PM EDT	Areal Flood Warning	LWX	Carroll, Frederick, Howard, Montgomery	4 hr
Jun 5, 4:47 PM EDT	Flash Flood Warning Considerable damage threat	LWX	Baltimore, Harford	3 hr
Jun 5, 6:15 PM EDT	Areal Flood Warning	LWX	Montgomery	3 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2020 Severe Thunderstorm Warnings in Virginia, 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; radar from the NEXRAD Level II archive.