Alert archive / Pennsylvania / Flash Flood Watches in 2018
Flash Flood Watch 14, NWS State College, PA
NWS State College, PA issued this flash flood watch at Aug 11, 2018, 10:54 AM EDT for 17 counties in Pennsylvania. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2018, 10:54 AM EDT (14:54 UTC)
- Expired
- Aug 11, 2018, 7:11 PM EDT
- In force
- 8 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Adams County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, York County, PA
The radar
The State College radar (KCCX), 101 km from the middle of the area, began a volume at 14:53 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, 2.9 hours before the alert went out and 199 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
- 963 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 11, 7:36 AM EDT, 3 hours 18 minutes earlier.
Area forecast discussion, Aug 11, 7:36 AM EDT, 3 hours 18 minutes before
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</html>Hazardous weather outlook, Aug 11, 5:55 AM EDT, 4 hours 59 minutes before
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Special weather statement, Aug 11, 5:17 AM EDT, 5 hours 37 minutes before
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</html>The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 8:16 PM EDT | Areal Flood Advisory | CTP | Centre, Clinton, Northumberland, Union | 3 hr |
| Aug 11, 2:45 AM EDT | Special Weather Statement | CTP | Lebanon | 30 min |
| Aug 11, 5:17 AM EDT | Special Weather Statement | CTP | Northumberland | 28 min |
| Aug 11, 5:47 AM EDT | Areal Flood Advisory | CTP | Columbia, Montour, Northumberland | 118 min |
| Aug 11, 8:30 AM EDT | Areal Flood Advisory | CTP | Lycoming, Sullivan, Tioga | 3 hr |
| Aug 11, 11:23 AM EDT | Areal Flood Advisory | CTP | Columbia, Lycoming, Sullivan | 3 hr |
| Aug 11, 12:14 PM EDT | Areal Flood Advisory | CTP | Columbia, Lycoming, Montour, Northumberland, Snyder, Union | 3 hr |
| Aug 11, 1:52 PM EDT | Areal Flood Advisory | CTP | Centre, Clinton, Lycoming | 3 hr |
Nearby
Flash Flood Watches in Pennsylvania, 2018Every flash flood watch in 2018
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.