Alert archive / Pennsylvania / Special Weather Statements in 2020

Special Weather Statement, NWS State College, PA

August 2, 2020York County, Pennsylvania

NWS State College, PA issued this special weather statement at Aug 2, 2020, 12:58 AM EDT for York County, Pennsylvania. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 2, 2020, 12:58 AM EDT (04:58 UTC)
Expired: Aug 2, 2020, 2:00 AM EDT
In force: 62 min
Issued by: NWS State College, PA

County York County, PA

The radar

The Sterling radar (KLWX), 144 km from the middle of the area, began a volume at 05:02 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, 5.0 hours before the alert went out and 142 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: 878 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 1, 11:28 PM EDT, 1 hour 30 minutes earlier.

Area forecast discussion, Aug 1, 11:28 PM EDT, 1 hour 30 minutes before

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Hazardous weather outlook, Aug 1, 11:23 PM EDT, 1 hour 35 minutes before

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In the hours before

Special weather statement, Aug 1, 10:54 PM EDT, 2 hours 4 minutes before

Special Weather Statement
National Weather Service State College PA
1054 PM EDT Sat Aug 1 2020

PAZ036-020330-
Franklin PA-
1054 PM EDT Sat Aug 1 2020

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF FRANKLIN COUNTY UNTIL
1130 PM EDT...

At 1053 PM EDT, Doppler radar indicated a strong thunderstorm near
Mont Alto, moving northeast at 20 mph.

Wind gusts up to 55 mph and pea size hail are possible. Torrential
rainfall is also occurring with this storm, and may lead to
localized flooding.

Locations impacted include...
Waynesboro, Greencastle, Fayetteville, Mont Alto, Quincy and Penn
State Mont Alto.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3981 7776 3994 7751 3981 7746 3979 7746
      3973 7771
TIME...MOT...LOC 0253Z 231DEG 15KT 3982 7763

RXR

Special weather statement, Aug 1, 11:14 PM EDT, 1 hour 44 minutes before

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Local storm report, Aug 1, 11:36 PM EDT, 1 hour 22 minutes before

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Local storm report, Aug 1, 11:44 PM EDT, 1 hour 14 minutes before

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Local storm report, Aug 1, 11:45 PM EDT, 1 hour 13 minutes before

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Special weather statement, Aug 2, 12:58 AM EDT, 0 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
Aug 1, 10:00 PM EDT	Special Weather Statement	CTP	Franklin	15 min
Aug 1, 10:20 PM EDT	Areal Flood Advisory	CTP	Franklin	55 min
Aug 1, 10:54 PM EDT	Special Weather Statement	CTP	Franklin	36 min
Aug 1, 10:59 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	31 min
Aug 1, 11:14 PM EDT	Special Weather Statement	CTP	Adams	31 min
Aug 2, 2:52 AM EDT	Areal Flood Advisory	CTP	Dauphin, Lancaster, Lebanon, York	3 hr
Aug 2, 3:05 AM EDT	Special Weather Statement	CTP	Berks	10 min
Aug 2, 3:43 AM EDT	Special Weather Statement	CTP	Lancaster	62 min
Aug 2, 5:11 AM EDT	Special Weather Statement	CTP	Lebanon	34 min
Aug 2, 7:24 AM EDT	Special Weather Statement	CTP	Schuylkill	66 min
Aug 2, 3:59 PM EDT	Flash Flood Watch	CTP	Adams, Cumberland, Dauphin, Franklin, Fulton, Lancaster and 4 more	47 hr
Aug 2, 5:15 PM EDT	Special Weather Statement	CTP	Schuylkill	30 min

Nearby

Special Weather Statements in Pennsylvania, 2020 Every special weather statement 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.