Alert archive / Pennsylvania / Areal Flood Warnings in 2017

Areal Flood Warning 3, NWS State College, PA

May 28, 2017Somerset County, Pennsylvania

NWS State College, PA issued this areal flood warning at May 28, 2017, 7:56 PM EDT for Somerset County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 28, 2017, 7:56 PM EDT (23:56 UTC)
Expired: May 28, 2017, 10:45 PM EDT
In force: 3 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

County Somerset County, PA

The radar

The Pittsburgh radar (KPBZ), 119 km from the middle of the area, began a volume at 23:59 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, 11.9 hours before the alert went out and 103 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 88 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 areal flood warning 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 areal flood warning went out at May 28, 7:27 PM EDT, 29 minutes earlier.

Area forecast discussion, May 28, 7:27 PM EDT, 29 minutes before

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Hazardous weather outlook, May 28, 6:27 PM EDT, 1 hour 29 minutes before

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In the hours before

Special weather statement, May 28, 3:37 PM EDT, 4 hours 19 minutes before

Special Weather Statement
National Weather Service State College PA
337 PM EDT SUN MAY 28 2017

PAZ024-033-282030-
Somerset PA-Cambria PA-
337 PM EDT SUN MAY 28 2017

...STRONG THUNDERSTORMS WILL AFFECT PARTS OF Western SOMERSET AND
western CAMBRIA COUNTIES UNTIL 430 PM EDT...

At 331 PM EDT, Doppler radar indicated strong thunderstorms along a
line extending from near Vinco to 6 miles west of New Centerville.
Movement was northeast at 15 mph.

Torrential rain of over one inch per hour is expected and isolated
instances of up to dime size hail and brief wind gusts to around 40
mph are possible. The greatest threat for the heavy rain and hail
will be to the west of route 219.

Locations impacted include...
Belmont, Johnstown, Westmont, Somerset, Ebensburg, Nanty-Glo, Acosta,
Davidsville, Vinco, East Conemaugh, New Centerville, South Fork,
Belsano, Boswell, Ehrenfeld, Tire Hill, Daisytown, Dale, Geistown and
Jerome.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Minor flooding may develop. Do not drive into water covering the
roadway.

Turn around don't drown.

&&

LAT...LON 3990 7940 4006 7928 4012 7921 4011 7919
      4012 7917 4016 7916 4036 7900 4054 7890
      4056 7864 3995 7907 3985 7941
TIME...MOT...LOC 1931Z 243DEG 13KT 4045 7894 3993 7932

Lambert

Local storm report, May 28, 6:22 PM EDT, 1 hour 34 minutes before

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Local storm report, May 28, 7:07 PM EDT, 49 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 28, 6:49 AM EDT	Dense Fog Advisory	CTP	Adams, Bedford, Blair, Cambria, Centre, Clearfield and 12 more	2 hr
May 28, 11:19 AM EDT	Flash Flood Watch	CTP	Bedford, Somerset	11 hr
May 28, 1:07 PM EDT	Special Weather Statement	CTP	Franklin	23 min
May 28, 3:37 PM EDT	Special Weather Statement	CTP	Cambria	53 min
May 28, 4:31 PM EDT	Areal Flood Advisory	CTP	Somerset	3 hr
May 28, 5:06 PM EDT	Flash Flood Warning	CTP	Somerset	3 hr
May 28, 5:12 PM EDT	Areal Flood Advisory	CTP	McKean, Warren	3 hr
May 28, 6:55 PM EDT	Areal Flood Advisory	CTP	Bedford, Fulton	110 min

Nearby

Areal Flood Warnings in Pennsylvania, 2017 Every areal flood warning in 2017

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.