Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 73, NWS State College, PA

May 23, 2019Somerset County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 23, 2019, 11:42 PM EDT for Somerset County, Pennsylvania. It was in force for 33 min. 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 23, 2019, 11:42 PM EDT (03:42 UTC)
Expired: May 24, 2019, 12:15 AM EDT
In force: 33 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 70.0 mph

County Somerset County, PA

The radar

The Pittsburgh radar (KPBZ), 119 km from the middle of the area, began a volume at 03:44 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 23, 9:20 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 00:00Z, 3.7 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: 485 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1287 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 10.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 23, 11:24 PM EDT, 18 minutes earlier.

Area forecast discussion, May 23, 11:24 PM EDT, 18 minutes before

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Hazardous weather outlook, May 23, 11:27 PM EDT, 15 minutes before

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In the hours before

Local storm report, May 23, 10:54 PM EDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1054 PM EDT THU MAY 23 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0805 PM     TSTM WND DMG     1 ENE STRONACH          40.97N  78.58W
05/23/2019                   CLEARFIELD         PA   FIRE DEPT/RESCUE

            MULTIPLE TREES DOWN IN GRAMPIAN AND PIKE TOWNSHIPS.
            TIME ESTIMATED FROM RADAR.

&&

EVENT NUMBER CTP1901302

COLBERT

Special weather statement, May 23, 10:59 PM EDT, 43 minutes before

Special Weather Statement
National Weather Service State College PA
1059 PM EDT Thu May 23 2019

PAZ025>027-240330-
Blair PA-Huntingdon PA-Mifflin PA-
1059 PM EDT Thu May 23 2019

...STRONG THUNDERSTORMS WILL AFFECT PARTS OF HUNTINGDON...MIFFLIN...
AND BLAIR COUNTIES UNTIL 1130 PM EDT...

At 1053 PM EDT, Doppler radar indicated strong thunderstorm near
Raystown Dam and Shirleysburg, moving southeast at 45 mph.

Additional heavy showers and a few thunderstorms are occurring to
the east and west of these storms. Very heavy rain of over one inch
in just 30 minutes is expected. Half inch diameter hail and winds in
excess of 40 mph are possible.

Locations impacted include...
Mount Union, Williamsburg, Rockhill Furnace, Raystown Dam, Trough
Creek State Park, Canoe Creek State Park, Royer, McConnellstown,
Mapleton, Orbisonia, Mill Creek, Kistler, Newton Hamilton,
Marklesburg, Shirleysburg and Cassville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4042 7833 4052 7832 4051 7813 4039 7776
      4038 7775 4026 7771 4024 7774 4016 7780
      4016 7781
TIME...MOT...LOC 0253Z 295DEG 45KT 4040 7808

Lambert

Local storm report, May 23, 11:03 PM EDT, 39 minutes before

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Special weather statement, May 23, 11:14 PM EDT, 28 minutes before

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Local storm report, May 23, 11:25 PM EDT, 17 minutes before

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Local storm report, May 23, 11:33 PM EDT, 9 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 23, 8:16 PM EDT	Special Weather Statement	CTP	Centre	59 min
May 23, 8:42 PM EDT	Special Weather Statement	CTP	Cambria	18 min
May 23, 8:52 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Mifflin, Snyder	53 min
May 23, 8:58 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	32 min
May 23, 9:09 PM EDT	Tornado Warning	CTP	Cambria, Somerset	34 min
May 23, 9:15 PM EDT	Severe Thunderstorm Warning	CTP	Columbia	30 min
May 23, 9:26 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Perry	34 min
May 23, 9:30 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Cambria, Somerset	45 min
May 23, 9:42 PM EDT	Special Weather Statement	CTP	Mifflin	18 min
May 23, 10:00 PM EDT	Special Weather Statement	CTP	Lebanon	45 min
May 23, 10:05 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Juniata, Mifflin, Perry	55 min
May 23, 10:12 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon	35 min
May 23, 10:15 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Fulton	30 min
May 23, 10:23 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	55 min
May 23, 10:35 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	22 min
May 23, 10:38 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	35 min
May 23, 10:59 PM EDT	Special Weather Statement	CTP	Blair, Huntingdon	31 min
May 23, 11:02 PM EDT	Tornado Warning	CTP	Lancaster	13 min
May 23, 11:14 PM EDT	Special Weather Statement	CTP	Cumberland	61 min
May 23, 11:59 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, York	61 min
May 24, 12:18 AM EDT	Special Weather Statement	CTP	Bedford, Somerset	42 min
May 24, 12:35 AM EDT	Special Weather Statement	CTP	York	40 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.