Alert archive / Maryland / Flash Flood Warnings in 2006

Flash Flood Warning 92, NWS Baltimore/Washington

June 28, 2006Montgomery County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 28, 2006, 12:19 AM EDT for Montgomery County, Maryland. It was in force for 4 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 28, 2006, 12:19 AM EDT (04:19 UTC)
Expired
Jun 28, 2006, 4:15 AM EDT
In force
4 hr
Issued by
NWS Baltimore/Washington
Area
Counties, with a storm outline in the text

County Montgomery County, MD

The radar

The Sterling radar (KLWX), 30 km from the middle of the area, began a volume at 04:22 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, 4.3 hours before the alert went out and 27 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 2006-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 408 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 2006-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 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
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, 1 hour 19 minutes earlier.

Area forecast discussion, Jun 27, 11:00 PM EDT, 1 hour 19 minutes before
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Hazardous weather outlook, Jun 27, 11:29 PM EDT, 50 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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In the hours before

Local storm report, Jun 27, 11:11 PM EDT, 1 hour 8 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>
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Local storm report, Jun 27, 11:23 PM EDT, 56 minutes before
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  <title>Service Notice</title>
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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 27, 11:26 PM EDT, 53 minutes before
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<html lang="en">
<head>
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  <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.

IssuedProductOfficeCountiesLasted
Jun 27, 8:17 PM EDTFlash Flood WarningLWXFairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park6 hr
Jun 27, 8:31 PM EDTFlash Flood WarningLWXAlbemarle, Greene, Madison, City of Charlottesville6 hr
Jun 27, 8:54 PM EDTFlash Flood WarningLWXPage, Rappahannock, Warren6 hr
Jun 27, 9:10 PM EDTFlash Flood WarningLWXClarke, Fauquier, Loudoun, Spotsylvania, Stafford, City of Fredericksburg6 hr
Jun 27, 9:25 PM EDTFlash Flood WarningLWXFrederick, Shenandoah, City of Winchester6 hr
Jun 27, 9:54 PM EDTFlash Flood WarningLWXAugusta, Nelson, Rockingham6 hr
Jun 27, 10:12 PM EDTFlash Flood WarningLWXCulpeper, Orange6 hr
Jun 27, 11:04 PM EDTDense Fog AdvisoryLWXClarke, Culpeper, Frederick, Greene, Madison, Nelson and 13 more5 hr
Jun 28, 3:32 PM EDTSevere Thunderstorm WarningLWXFrederick58 min
Jun 28, 6:15 PM EDTSpecial Marine WarningLWX90 min
Jun 27, 8:58 PM EDTFlash Flood WarningLWXAnne Arundel, Baltimore, Harford, City of Baltimore6 hr
Jun 27, 11:19 PM EDTFlash Flood WarningLWXCarroll, Frederick, Montgomery6 hr
Jun 27, 11:27 PM EDTFlash Flood WarningLWXWashington6 hr
Jun 28, 2:54 AM EDTFlash Flood WarningLWXBaltimore, Harford, City of Baltimore3 hr
Jun 28, 4:15 AM EDTFlash Flood WarningLWXMontgomery6 hr
Jun 28, 10:00 AM EDTFlash Flood WarningLWXMontgomery4 hr
Jun 28, 2:00 PM EDTFlash Flood WarningLWXMontgomery6 hr

Nearby

Flash Flood Warnings in Maryland, 2006Every 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.