Alert archive / Pennsylvania / Flood Watches in 2018

Flood Watch 8, NWS State College, PA

September 8, 201833 counties in Pennsylvania

NWS State College, PA issued this flood watch at Sep 8, 2018, 3:33 AM EDT for 33 counties in Pennsylvania. It took effect at Sep 8, 2018, 8:00 PM EDT. It was in force for 48 hr.

The area

The counties it named.

The facts

Issued: Sep 8, 2018, 3:33 AM EDT (07:33 UTC)
In effect from: Sep 8, 2018, 8:00 PM EDT
Expired: Sep 10, 2018, 8:00 PM EDT
In force: 48 hr
Issued by: NWS State College, PA
Flood severity: None

All 33 counties

Adams County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, McKean County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, Warren County, PA, York County, PA

The radar

The State College radar (KCCX), 43 km from the middle of the area, began a volume at 07:32 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, 7.6 hours before the alert went out and 201 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: 1088 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 47 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 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 flood watch went out at Sep 8, 12:45 AM EDT, 2 hours 48 minutes earlier.

Area forecast discussion, Sep 8, 12:45 AM EDT, 2 hours 48 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
Sep 7, 8:49 PM EDT	Areal Flood Advisory	CTP	Adams, York	56 min
Sep 8, 3:12 AM EDT	Areal Flood Advisory	CTP	Adams, Franklin, York	3 hr
Sep 8, 6:00 AM EDT	Areal Flood Advisory	CTP	Adams, Lancaster, York	3 hr

Nearby

Flood Watches in Pennsylvania, 2018 Every 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.