Alert archive / Maryland / Flash Flood Warnings in 2006

Flash Flood Warning 90, NWS Baltimore/Washington

June 27, 2006Carroll County, Frederick County, Montgomery County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 27, 2006, 11:19 PM EDT for Carroll County, Frederick County, Montgomery County, Maryland. It was in force for 6 hr. 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 27, 2006, 11:19 PM EDT (03:19 UTC)
Expired: Jun 28, 2006, 5:15 AM EDT
In force: 6 hr
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

Counties Carroll County, MD, Frederick County, MD, Montgomery County, MD

The radar

The Sterling radar (KLWX), 52 km from the middle of the area, began a volume at 03:22 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, 3.3 hours before the alert went out and 52 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: 408 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.1

Open this sounding in Storm Lab

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 Jun 27, 11:00 PM EDT, 19 minutes earlier.

Area forecast discussion, Jun 27, 11:00 PM EDT, 19 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, Jun 27, 6:32 PM EDT, 4 hours 47 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>

In the hours before

Local storm report, Jun 27, 6:16 PM EDT, 5 hours 3 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, Jun 27, 11:11 PM EDT, 8 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 8:17 PM EDT	Flash Flood Warning	LWX	Fairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park	6 hr
Jun 27, 8:31 PM EDT	Flash Flood Warning	LWX	Albemarle, Greene, Madison, City of Charlottesville	6 hr
Jun 27, 8:54 PM EDT	Flash Flood Warning	LWX	Page, Rappahannock, Warren	6 hr
Jun 27, 9:10 PM EDT	Flash Flood Warning	LWX	Clarke, Fauquier, Loudoun, Spotsylvania, Stafford, City of Fredericksburg	6 hr
Jun 27, 9:25 PM EDT	Flash Flood Warning	LWX	Frederick, Shenandoah, City of Winchester	6 hr
Jun 27, 9:54 PM EDT	Flash Flood Warning	LWX	Augusta, Nelson, Rockingham	6 hr
Jun 27, 10:12 PM EDT	Flash Flood Warning	LWX	Culpeper, Orange	6 hr
Jun 27, 11:04 PM EDT	Dense Fog Advisory	LWX	Clarke, Culpeper, Frederick, Greene, Madison, Nelson and 13 more	5 hr
Jun 28, 3:32 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	58 min
Jun 28, 6:15 PM EDT	Special Marine Warning	LWX		90 min
Jun 27, 8:58 PM EDT	Flash Flood Warning	LWX	Anne Arundel, Baltimore, Harford, City of Baltimore	6 hr
Jun 27, 11:27 PM EDT	Flash Flood Warning	LWX	Washington	6 hr
Jun 28, 12:19 AM EDT	Flash Flood Warning	LWX	Montgomery	4 hr
Jun 28, 2:54 AM EDT	Flash Flood Warning	LWX	Baltimore, Harford, City of Baltimore	3 hr
Jun 28, 4:15 AM EDT	Flash Flood Warning	LWX	Montgomery	6 hr
Jun 28, 10:00 AM EDT	Flash Flood Warning	LWX	Montgomery	4 hr
Jun 28, 2:00 PM EDT	Flash Flood Warning	LWX	Montgomery	6 hr

Nearby

Flash Flood Warnings in Maryland, 2006 Every flash flood warning in 2006

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.