Alert archive / Pennsylvania / Flash Flood Watches in 2020

Flash Flood Watch 5, NWS State College, PA

July 8, 2020Columbia County, Lebanon County, Schuylkill County, Pennsylvania

NWS State College, PA issued this flash flood watch at Jul 8, 2020, 12:19 PM EDT for Columbia County, Lebanon County, Schuylkill County, Pennsylvania. It took effect at Jul 8, 2020, 2:00 PM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jul 8, 2020, 12:19 PM EDT (16:19 UTC)
In effect from: Jul 8, 2020, 2:00 PM EDT
Expired: Jul 8, 2020, 9:04 PM EDT
In force: 7 hr
Issued by: NWS State College, PA
Flood severity: None

Counties Columbia County, PA, Lebanon County, PA, Schuylkill County, PA

The radar

The State College radar (KCCX), 140 km from the middle of the area, began a volume at 16:21 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, 4.3 hours before the alert went out and 215 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: 394 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 926 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -15 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 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 Jul 8, 11:58 AM EDT, 21 minutes earlier.

Area forecast discussion, Jul 8, 11:58 AM EDT, 21 minutes before

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Hazardous weather outlook, Jul 8, 4:54 AM EDT, 7 hours 25 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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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
Jul 7, 8:00 PM EDT	Special Weather Statement	CTP	Elk	45 min
Jul 8, 11:14 AM EDT	Areal Flood Advisory	CTP	Schuylkill	106 min
Jul 8, 1:16 PM EDT	Areal Flood Advisory	CTP	Schuylkill	3 hr
Jul 8, 3:44 PM EDT	Special Weather Statement	CTP	Lebanon	31 min
Jul 8, 4:06 PM EDT	Special Weather Statement	CTP	Tioga	54 min
Jul 8, 4:35 PM EDT	Areal Flood Advisory	CTP	Lancaster	115 min
Jul 8, 4:43 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Jul 8, 4:58 PM EDT	Special Weather Statement	CTP	Columbia, Montour	47 min
Jul 8, 5:03 PM EDT	Areal Flood Advisory	CTP	Somerset	117 min
Jul 8, 5:18 PM EDT	Special Weather Statement	CTP	Lancaster	27 min
Jul 8, 5:23 PM EDT	Flash Flood Warning	CTP	Somerset	3 hr
Jul 8, 5:28 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Jul 8, 5:44 PM EDT	Areal Flood Advisory	CTP	Cambria	2 hr
Jul 8, 5:48 PM EDT	Areal Flood Advisory	CTP	York	3 hr
Jul 8, 5:52 PM EDT	Flash Flood Warning	CTP	York	3 hr
Jul 8, 5:52 PM EDT	Special Weather Statement	CTP	Sullivan	23 min
Jul 8, 6:01 PM EDT	Severe Thunderstorm Warning	CTP	York	44 min
Jul 8, 6:04 PM EDT	Special Weather Statement	CTP	Northumberland	41 min
Jul 8, 6:09 PM EDT	Severe Thunderstorm Warning	CTP	Northumberland, Snyder, Union	51 min
Jul 8, 6:15 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	60 min
Jul 8, 6:24 PM EDT	Special Weather Statement	CTP	Cumberland	36 min
Jul 8, 6:33 PM EDT	Areal Flood Advisory	CTP	York	3 hr
Jul 8, 6:54 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Northumberland, Perry, Snyder	36 min
Jul 8, 6:58 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Montour, Northumberland, Sullivan, Union	62 min
Jul 8, 7:14 PM EDT	Special Weather Statement	CTP	Clearfield	31 min
Jul 8, 7:22 PM EDT	Areal Flood Advisory	CTP	Cumberland	3 hr
Jul 8, 7:29 PM EDT	Special Weather Statement	CTP	Clinton	46 min
Jul 8, 7:33 PM EDT	Special Weather Statement	CTP	Snyder	42 min
Jul 8, 7:39 PM EDT	Special Weather Statement	CTP	Adams	36 min

Nearby

Flash Flood Watches in Pennsylvania, 2020 Every flash flood watch in 2020

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.