Alert archive / Pennsylvania / Areal Flood Warnings in 2017

Areal Flood Warning 7, NWS State College, PA

July 23, 2017Dauphin County, Northumberland County, Pennsylvania

NWS State College, PA issued this areal flood warning at Jul 23, 2017, 10:58 PM EDT for Dauphin County, Northumberland County, Pennsylvania. 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: Jul 23, 2017, 10:58 PM EDT (02:58 UTC)
Expired: Jul 24, 2017, 5:00 AM EDT
In force: 6 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Dauphin County, PA, Northumberland County, PA

The radar

The State College radar (KCCX), 111 km from the middle of the area, began a volume at 02:57 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, 3.0 hours before the alert went out and 195 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: 431 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1103 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this areal flood warning went out at Jul 23, 10:13 PM EDT, 45 minutes earlier.

Area forecast discussion, Jul 23, 10:13 PM EDT, 45 minutes before

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Hazardous weather outlook, Jul 23, 10:00 PM EDT, 58 minutes before

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In the hours before

Local storm report, Jul 23, 7:21 PM EDT, 3 hours 37 minutes before

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Local storm report, Jul 23, 7:25 PM EDT, 3 hours 33 minutes before

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        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, Jul 23, 7:37 PM EDT, 3 hours 21 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.
      </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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Local storm report, Jul 23, 9:18 PM EDT, 1 hour 40 minutes before

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      <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, Jul 23, 9:21 PM EDT, 1 hour 37 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>
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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>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Jul 23, 10:04 PM EDT, 54 minutes before

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<head>
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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 State College, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 8:07 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland	3 hr
Jul 23, 8:35 PM EDT	Areal Flood Advisory	CTP	Elk	3 hr
Jul 23, 9:15 PM EDT	Areal Flood Advisory	CTP	Snyder, Union	3 hr
Jul 23, 9:24 PM EDT	Areal Flood Warning	CTP	Dauphin	6 hr
Jul 23, 9:30 PM EDT	Areal Flood Advisory	CTP	Cameron, Potter, Tioga	3 hr
Jul 23, 10:09 PM EDT	Flash Flood Warning	CTP	Cameron, Potter, Tioga	4 hr
Jul 23, 10:36 PM EDT	Areal Flood Advisory	CTP	Somerset	3 hr
Jul 23, 10:49 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland	4 hr
Jul 23, 11:33 PM EDT	Areal Flood Advisory	CTP	McKean	4 hr
Jul 23, 11:38 PM EDT	Areal Flood Advisory	CTP	Clinton, Lycoming	3 hr
Jul 24, 12:50 AM EDT	Areal Flood Advisory	CTP	York	115 min
Jul 24, 2:32 AM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan, Tioga and 1 more	3 hr
Jul 24, 2:43 AM EDT	Areal Flood Advisory	CTP	Clinton	5 hr
Jul 24, 5:28 AM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan, Union	2 hr
Jul 24, 2:11 PM EDT	Special Weather Statement	CTP	Centre	34 min
Jul 24, 2:15 PM EDT	Special Weather Statement	CTP	Blair	45 min
Jul 24, 2:40 PM EDT	Areal Flood Advisory	CTP	Clinton, Lycoming	3 hr
Jul 24, 2:56 PM EDT	Special Weather Statement	CTP	Blair	49 min
Jul 24, 3:14 PM EDT	Special Weather Statement	CTP	Montour	46 min
Jul 24, 3:17 PM EDT	Special Weather Statement	CTP	Montour	58 min
Jul 24, 3:29 PM EDT	Tornado Warning	CTP	Columbia, Montour, Northumberland	46 min
Jul 24, 3:58 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Union	62 min
Jul 24, 4:15 PM EDT	Areal Flood Advisory	CTP	Columbia, Montour, Northumberland, Union	3 hr
Jul 24, 4:42 PM EDT	Flash Flood Warning	CTP	Columbia, Montour, Northumberland, Union	3 hr
Jul 24, 4:56 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Northumberland, Schuylkill	64 min
Jul 24, 5:37 PM EDT	Special Weather Statement	CTP	Schuylkill	23 min
Jul 24, 6:52 PM EDT	Special Weather Statement	CTP	York	38 min

Nearby

Areal Flood Warnings in Pennsylvania, 2017 Every areal flood warning in 2017

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.