Alert archive / Pennsylvania / Flood Watches in 2018
Flood Watch 9, NWS State College, PA
NWS State College, PA issued this flood watch at Sep 27, 2018, 4:54 AM EDT for Adams County, Lancaster County, York County, Pennsylvania. It took effect at Sep 27, 2018, 5:00 PM EDT. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Sep 27, 2018, 4:54 AM EDT (08:54 UTC)
- In effect from
- Sep 27, 2018, 5:00 PM EDT
- Expired
- Sep 28, 2018, 4:07 AM EDT
- In force
- 11 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Adams County, PA, Lancaster County, PA, York County, PA
The radar
The Sterling radar (KLWX), 126 km from the middle of the area, began a volume at 08:56 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, 8.9 hours before the alert went out and 125 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
- 32 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
Nearby
Flood Watches in Pennsylvania, 2018Every 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.