Alert archive / Pennsylvania / Flash Flood Watches in 2011

Flash Flood Watch 12, NWS State College, PA

September 8, 201111 counties in Pennsylvania

NWS State College, PA issued this flash flood watch at Sep 8, 2011, 7:59 PM EDT for 11 counties in Pennsylvania. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Sep 8, 2011, 7:59 PM EDT (23:59 UTC)
Expired: Sep 9, 2011, 4:20 AM EDT
In force: 8 hr
Issued by: NWS State College, PA
Flood severity: None

Counties Adams County, PA, Bedford County, PA, Blair County, PA, Cumberland County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA, York County, PA

The radar

The State College radar (KCCX), 85 km from the middle of the area, began a volume at 00:03 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 12:00Z, 12.0 hours before the alert went out and 141 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: 222 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Sep 8, 6:10 PM EDT, 1 hour 49 minutes earlier.

Area forecast discussion, Sep 8, 6:10 PM EDT, 1 hour 49 minutes before

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Hazardous weather outlook, Sep 8, 8:23 AM EDT, 11 hours 36 minutes before

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

Issued	Product	Office	Counties	Lasted
Sep 7, 10:09 PM EDT	Flash Flood Warning Emergency	CTP	Columbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 4 more	6 hr
Sep 7, 11:11 PM EDT	Flash Flood Warning	CTP	Adams, Cumberland, Perry	6 hr
Sep 8, 12:33 AM EDT	Special Weather Statement	CTP	Dauphin	27 min
Sep 8, 12:55 AM EDT	River Flood Warning	CTP	Tioga	8 hr
Sep 8, 12:59 AM EDT	Areal Flood Warning	CTP	Dauphin, Lancaster, Lebanon, York	8 hr
Sep 8, 1:05 AM EDT	Special Weather Statement	CTP	Dauphin	25 min
Sep 8, 1:30 AM EDT	Special Weather Statement	CTP	Lebanon	30 min
Sep 8, 1:33 AM EDT	Special Weather Statement	CTP	Dauphin	27 min
Sep 8, 1:52 AM EDT	Special Weather Statement	CTP	Northumberland	23 min
Sep 8, 1:58 AM EDT	Special Weather Statement	CTP	Lebanon, Schuylkill	32 min
Sep 8, 2:17 AM EDT	Special Weather Statement	CTP	Northumberland	28 min
Sep 8, 3:16 AM EDT	Special Weather Statement	CTP	Perry	59 min
Sep 8, 3:44 AM EDT	Special Weather Statement	CTP	Schuylkill	46 min
Sep 8, 4:01 AM EDT	Areal Flood Warning	CTP	Columbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 4 more	34 hr
Sep 8, 5:01 AM EDT	Areal Flood Warning	CTP	Adams, Cumberland, Perry	22 hr
Sep 8, 5:19 AM EDT	Special Weather Statement	CTP	Lancaster	26 min
Sep 8, 5:57 AM EDT	Special Weather Statement	CTP	Lancaster	63 min
Sep 8, 7:02 AM EDT	Special Weather Statement	CTP	Lancaster	58 min
Sep 8, 7:46 AM EDT	River Flood Warning	CTP	Lycoming	8 hr
Sep 8, 7:53 AM EDT	Special Weather Statement	CTP	Lancaster	52 min
Sep 8, 9:22 AM EDT	Areal Flood Warning	CTP	Dauphin, Lancaster, Lebanon, York	24 hr

Nearby

Flash Flood Watches in Pennsylvania, 2011 Every flash flood watch 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.