Alert archive / Pennsylvania / Flash Flood Watches in 2011
Flash Flood Watch 10, NWS State College, PA
NWS State College, PA issued this flash flood watch at Aug 26, 2011, 5:34 AM EDT for 5 counties in Pennsylvania. It took effect at Aug 27, 2011, 6:00 PM EDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Aug 26, 2011, 5:34 AM EDT (09:34 UTC)
- In effect from
- Aug 27, 2011, 6:00 PM EDT
- Expired
- Aug 28, 2011, 12:00 PM EDT
- In force
- 18 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, Schuylkill County, PA, York County, PA
The radar
The State College radar (KCCX), 146 km from the middle of the area, began a volume at 09:35 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, 9.6 hours before the alert went out and 168 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.
- Mixed-layer CAPE
- 1032 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.5
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 Aug 26, 5:22 AM EDT, 12 minutes earlier.
Area forecast discussion, Aug 26, 5:22 AM EDT, 12 minutes before
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</html>Hazardous weather outlook, Aug 26, 4:09 AM EDT, 1 hour 25 minutes before
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Flash Flood Watches in Pennsylvania, 2011Every 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.