Alert archive / Maryland / Flash Flood Warnings in 2011

Flash Flood Warning 60, NWS Baltimore/Washington

July 3, 2011Carroll County, Frederick County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jul 3, 2011, 3:14 AM EDT for Carroll County, Frederick County, Maryland. It was in force for 3 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
Jul 3, 2011, 3:14 AM EDT (07:14 UTC)
Expired
Jul 3, 2011, 6:24 AM EDT
In force
3 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties Carroll County, MD, Frederick County, MD

The radar

The Sterling radar (KLWX), 65 km from the middle of the area, began a volume at 07:17 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, 7.2 hours before the alert went out and 65 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 2011-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2349 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
115 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 2, 8:54 PM EDT, 6 hours 20 minutes earlier.

Area forecast discussion, Jul 2, 8:54 PM EDT, 6 hours 20 minutes before
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Hazardous weather outlook, Jul 2, 10:41 PM EDT, 4 hours 33 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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In the hours before

Special weather statement, Jul 3, 2:41 AM EDT, 33 minutes before
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<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.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 1:59 AM EDTSmall Craft AdvisoryLWX6 hr
Jul 3, 5:20 AM EDTSpecial Weather StatementLWXArlington, City of Alexandria, City of Falls Church25 min
Jul 3, 3:25 PM EDTSpecial Weather StatementLWXCity of Staunton, City of Waynesboro50 min
Jul 3, 3:33 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Waynesboro42 min
Jul 3, 3:52 PM EDTSpecial Weather StatementLWXFrederick, City of Winchester38 min
Jul 3, 4:04 PM EDTSpecial Weather StatementLWXGreene41 min
Jul 3, 4:08 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Waynesboro67 min
Jul 3, 4:34 PM EDTSpecial Weather StatementLWXClarke, Frederick, City of Winchester41 min
Jul 3, 4:40 PM EDTSpecial Weather StatementLWXOrange50 min
Jul 3, 4:52 PM EDTSevere Thunderstorm WarningLWXAlbemarle24 min
Jul 3, 5:21 PM EDTSpecial Weather StatementLWXClarke, Frederick, City of Winchester39 min
Jul 3, 5:23 PM EDTSpecial Weather StatementLWXLoudoun37 min
Jul 3, 5:27 PM EDTSevere Thunderstorm WarningLWXFairfax, Loudoun48 min
Jul 3, 5:38 PM EDTSpecial Marine WarningLWX95 min
Jul 3, 5:54 PM EDTSpecial Weather StatementLWXAugusta, Greene, City of Staunton51 min
Jul 3, 5:58 PM EDTSpecial Marine WarningLWX2 hr
Jul 3, 5:58 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Loudoun, City of Alexandria, City of Fairfax, City of Falls Church62 min
Jul 3, 6:04 PM EDTSpecial Weather StatementLWXShenandoah41 min
Jul 3, 6:09 PM EDTSpecial Weather StatementLWXClarke51 min
Jul 3, 6:15 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Warren45 min
Jul 3, 6:28 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Prince William32 min
Jul 3, 6:36 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, City of Alexandria43 min
Jul 3, 6:39 PM EDTSpecial Marine WarningLWX111 min
Jul 3, 6:44 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Rappahannock, Shenandoah, Warren37 min
Jul 3, 6:51 PM EDTSpecial Weather StatementLWXWarren24 min
Jul 3, 6:55 PM EDTSpecial Weather StatementLWXFauquier, Prince William, City of Manassas, City of Manassas Park35 min
Jul 3, 7:00 PM EDTSpecial Weather StatementLWXFairfax, City of Fairfax60 min
Jul 3, 7:08 PM EDTSpecial Weather StatementLWXRappahannock52 min
Jul 3, 7:21 PM EDTSpecial Weather StatementLWXCulpeper, Fairfax, Fauquier, Prince William, Rappahannock, City of Fairfax and 2 more54 min
Jul 3, 7:38 PM EDTSpecial Marine WarningLWX112 min
Jul 3, 7:39 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Prince William40 min
Jul 3, 7:43 PM EDTSevere Thunderstorm WarningLWXPrince William, Stafford62 min
Jul 3, 2:41 AM EDTSpecial Weather StatementLWXFrederick34 min
Jul 3, 3:14 PM EDTSevere Thunderstorm WarningLWXWashington46 min
Jul 3, 3:56 PM EDTSevere Thunderstorm WarningLWXWashington49 min
Jul 3, 5:10 PM EDTSpecial Weather StatementLWXMontgomery50 min
Jul 3, 5:35 PM EDTSevere Thunderstorm WarningLWXBaltimore, Howard, Montgomery35 min
Jul 3, 6:03 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Harford, Howard, Montgomery, Prince George's and 1 more72 min
Jul 3, 7:22 PM EDTSpecial Weather StatementLWXAnne Arundel23 min
Jul 3, 3:08 PM EDTSpecial Weather StatementLWXMorgan22 min
Jul 3, 4:45 PM EDTSpecial Weather StatementLWXBerkeley, Jefferson45 min

Nearby

Flash Flood Warnings in Maryland, 2011Every flash flood warning in 2011

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.