Alert archive / Pennsylvania / Flash Flood Watches in 2011

Flash Flood Watch 6, NWS State College, PA

May 15, 2011McKean County, Warren County, Pennsylvania

NWS State College, PA issued this flash flood watch at May 15, 2011, 9:50 AM EDT for McKean County, Warren County, Pennsylvania. It took effect at May 15, 2011, 10:00 AM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: May 15, 2011, 9:50 AM EDT (13:50 UTC)
In effect from: May 15, 2011, 10:00 AM EDT
Expired: May 15, 2011, 10:00 PM EDT
In force: 12 hr
Issued by: NWS State College, PA
Flood severity: None

Counties McKean County, PA, Warren County, PA

The radar

The State College radar (KCCX), 125 km from the middle of the area, began a volume at 13:50 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, 1.8 hours before the alert went out and 343 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: 55 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 50 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 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 May 15, 7:48 AM EDT, 2 hours 2 minutes earlier.

Area forecast discussion, May 15, 7:48 AM EDT, 2 hours 2 minutes before

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Hazardous weather outlook, May 15, 4:04 AM EDT, 5 hours 46 minutes before

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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
May 15, 2:05 PM EDT	Special Weather Statement	CTP	Fulton	70 min
May 15, 2:23 PM EDT	Special Weather Statement	CTP	Lancaster	52 min
May 15, 2:26 PM EDT	Special Weather Statement	CTP	Lebanon	49 min
May 15, 3:42 PM EDT	Special Weather Statement	CTP	Schuylkill	48 min
May 15, 5:18 PM EDT	Areal Flood Advisory	CTP	Perry	117 min
May 15, 6:53 PM EDT	Special Weather Statement	CTP	Lancaster	52 min
May 15, 7:04 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	26 min

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.