Alert archive / Pennsylvania / Flood Watches in 2018

Flood Watch 7, NWS State College, PA

May 16, 201811 counties in Pennsylvania

NWS State College, PA issued this flood watch at May 16, 2018, 1:26 PM EDT for 11 counties in Pennsylvania. It took effect at May 17, 2018, 2:00 PM EDT. It was in force for 47 hr.

The area

The counties it named.

The facts

Issued: May 16, 2018, 1:26 PM EDT (17:26 UTC)
In effect from: May 17, 2018, 2:00 PM EDT
Expired: May 19, 2018, 1:12 PM EDT
In force: 47 hr
Issued by: NWS State College, PA
Flood severity: None

Counties Adams County, PA, Bedford County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Lancaster County, PA, Lebanon County, PA, Perry County, PA, Somerset County, PA, York County, PA

The radar

The State College radar (KCCX), 106 km from the middle of the area, began a volume at 17:28 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

Pittsburgh, PA (KAGC), launched 12:00Z, 5.4 hours before the alert went out and 233 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: 34 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 70 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 May 15, 7:36 PM EDT, 17 hours 50 minutes earlier.

Area forecast discussion, May 15, 7:36 PM EDT, 17 hours 50 minutes before

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Hazardous weather outlook, May 15, 6:58 PM EDT, 18 hours 28 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 16, 4:16 PM EDT	Areal Flood Advisory	CTP	Cambria, Somerset	3 hr
May 16, 6:44 PM EDT	Areal Flood Warning	CTP	Somerset	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.