Alert archive / Maryland / Flash Flood Warnings in 2026

Flash Flood Warning 37, NWS Baltimore/Washington

August 10, 2026Baltimore County, Harford County, City of Baltimore, Maryland

NWS Baltimore/Washington issued this flash flood warning at Aug 10, 2026, 5:40 PM EDT for Baltimore County, Harford County, City of Baltimore, Maryland. It was in force for 88 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: Aug 10, 2026, 5:40 PM EDT (21:40 UTC)
Expired: Aug 10, 2026, 7:08 PM EDT
In force: 88 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Baltimore County, MD, City of Baltimore, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 98 km from the middle of the area, began a volume at 21:42 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 flash flood 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 flash flood warning went out at Aug 10, 3:43 PM EDT, 1 hour 57 minutes earlier.

Area forecast discussion, Aug 10, 3:43 PM EDT, 1 hour 57 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Aug 10, 5:39 PM EDT, 1 minute before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Local storm report, Aug 10, 5:22 PM EDT, 18 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:28 PM EDT, 12 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:33 PM EDT, 7 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:34 PM EDT, 6 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:36 PM EDT, 4 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 10, 5:39 PM EDT, 1 minute before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </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
Aug 10, 2:40 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Shenandoah, City of Winchester	53 min
Aug 10, 2:54 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Page, Rockingham, Shenandoah, Warren	51 min
Aug 10, 2:57 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Highland, Rockingham, City of Harrisonburg	63 min
Aug 10, 3:13 PM EDT	Special Marine Warning	LWX		62 min
Aug 10, 3:15 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	60 min
Aug 10, 3:27 PM EDT	Severe Thunderstorm Warning	LWX	Clarke	18 min
Aug 10, 3:31 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Loudoun, Madison, Page, Rappahannock and 1 more	29 min
Aug 10, 3:38 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Page, Rappahannock, Shenandoah, Warren	37 min
Aug 10, 3:42 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Rockingham, Shenandoah, City of Harrisonburg, City of Staunton, City of Waynesboro	48 min
Aug 10, 3:44 PM EDT	Special Marine Warning	LWX		107 min
Aug 10, 3:48 PM EDT	Special Marine Warning	LWX		86 min
Aug 10, 3:57 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Loudoun, City of Alexandria, City of Fairfax, City of Falls Church	48 min
Aug 10, 4:00 PM EDT	Special Marine Warning	LWX		2 hr
Aug 10, 4:03 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fairfax, Fauquier, Loudoun, Madison, Prince William and 4 more	57 min
Aug 10, 4:04 PM EDT	Special Marine Warning	LWX		116 min
Aug 10, 4:06 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Culpeper, Greene, Madison, Nelson, Orange and 5 more	69 min
Aug 10, 4:36 PM EDT	Special Marine Warning	LWX		114 min
Aug 10, 5:05 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria	25 min
Aug 10, 5:19 PM EDT	Special Marine Warning	LWX		116 min
Aug 10, 5:20 PM EDT	Special Marine Warning	LWX		115 min
Aug 10, 5:30 PM EDT	Severe Thunderstorm Warning	LWX	King George, Stafford	45 min
Aug 10, 5:53 PM EDT	Special Marine Warning	LWX		37 min
Aug 10, 5:57 PM EDT	Special Marine Warning	LWX		2 hr
Aug 10, 1:14 PM EDT	Severe Thunderstorm Warning	LWX	Garrett	61 min
Aug 10, 1:48 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	57 min
Aug 10, 1:49 PM EDT	Tornado Warning	LWX	Allegany, Garrett	26 min
Aug 10, 1:57 PM EDT	Severe Thunderstorm Warning	LWX	Allegany, Washington	48 min
Aug 10, 2:25 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Allegany, Washington	35 min
Aug 10, 2:29 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	31 min
Aug 10, 2:43 PM EDT	Severe Thunderstorm Warning	LWX	Washington	50 min
Aug 10, 2:46 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	44 min
Aug 10, 2:50 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	25 min
Aug 10, 2:56 PM EDT	Severe Thunderstorm Warning	LWX	Harford	38 min
Aug 10, 3:10 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Washington	65 min
Aug 10, 3:12 PM EDT	Flash Flood Warning	LWX	Frederick, Washington	3 hr
Aug 10, 3:12 PM EDT	Severe Thunderstorm Warning	LWX	Harford	48 min
Aug 10, 3:21 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick	39 min
Aug 10, 3:55 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Baltimore, Carroll, Frederick, Harford, Howard, Montgomery and 1 more	50 min
Aug 10, 4:10 PM EDT	Severe Thunderstorm Warning Destructive damage threat	LWX	Baltimore, Carroll, Howard	35 min
Aug 10, 4:14 PM EDT	Tornado Warning	LWX	Baltimore, Carroll, Howard, City of Baltimore	18 min
Aug 10, 4:18 PM EDT	Tornado Warning	LWX	Anne Arundel, Baltimore, Howard, City of Baltimore	13 min
Aug 10, 4:33 PM EDT	Severe Thunderstorm Warning	LWX	Cecil, Harford	42 min
Aug 10, 4:41 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Calvert, Howard, Prince George's, City of Baltimore	31 min
Aug 10, 5:21 PM EDT	Severe Thunderstorm Warning Destructive damage threat	LWX	Prince George's	24 min
Aug 10, 5:29 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Prince George's, Saint Mary's	46 min
Aug 10, 5:33 PM EDT	Severe Thunderstorm Warning	LWX	Cecil	27 min
Aug 10, 5:36 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	24 min
Aug 10, 5:56 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Saint Mary's	64 min
Aug 10, 6:51 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	24 min

Nearby

Flash Flood Warnings in Maryland, 2026 Every flash flood warning in 2026

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.