Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS State College, PA

July 21, 2021Lancaster County, Pennsylvania

NWS State College, PA issued this special weather statement at Jul 21, 2021, 6:28 PM EDT for Lancaster County, Pennsylvania. It was in force for 32 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: Jul 21, 2021, 6:28 PM EDT (22:28 UTC)
Expired: Jul 21, 2021, 7:00 PM EDT
In force: 32 min
Issued by: NWS State College, PA

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 124 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 147 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: 638 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1275 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Jul 21, 4:57 PM EDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jul 21, 4:57 PM EDT, 1 hour 31 minutes before

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Hazardous weather outlook, Jul 21, 2:25 PM EDT, 4 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service State College PA
225 PM EDT Wed Jul 21 2021

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>058-063-064-221830-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Juniata-Somerset-Bedford-Fulton-Franklin-Tioga-Northern Lycoming-
Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Cumberland-Adams-
225 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ059-065-066-221830-
Lebanon-York-Lancaster-
225 PM EDT Wed Jul 21 2021

...SEVERE THUNDERSTORM WATCH 385 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

In the hours before

Special weather statement, Jul 21, 4:00 PM EDT, 2 hours 28 minutes before

Special Weather Statement
National Weather Service State College PA
400 PM EDT Wed Jul 21 2021

PAZ065-212045-
York PA-
400 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF YORK COUNTY UNTIL 445
PM EDT...

At 400 PM EDT, Doppler radar indicated a strong thunderstorm over
Glen Rock, moving southeast at 20 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Shrewsbury, Stewartstown, Glen Rock, Jacobus, Cross Roads, Railroad,
Loganville, Winterstown, Fawn Grove and Glenville.

LAT...LON 3988 7672 3973 7635 3972 7636 3972 7693
TIME...MOT...LOC 2000Z 309DEG 18KT 3980 7671

Banghoff

Special weather statement, Jul 21, 4:02 PM EDT, 2 hours 26 minutes before

Special Weather Statement
National Weather Service State College PA
402 PM EDT Wed Jul 21 2021

PAZ050-052-057-212030-
Northumberland PA-Dauphin PA-Snyder PA-
402 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF NORTHUMBERLAND...
DAUPHIN...AND SNYDER COUNTIES UNTIL 430 PM EDT...

At 402 PM EDT, Doppler radar indicated a strong thunderstorm over
Mount Pleasant Mills, moving southeast at 25 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Millersburg, Port Trevorton, Mount Pleasant Mills, Urban,
Meiserville, Fremont, Freeburg, Dalmatia, Berrysburg, Herndon and
Pillow.

LAT...LON 4065 7669 4054 7694 4058 7697 4059 7696
      4062 7696 4064 7694 4065 7695 4064 7700
      4066 7701 4066 7703 4073 7708 4080 7702
TIME...MOT...LOC 2002Z 314DEG 22KT 4072 7700

Banghoff

Special weather statement, Jul 21, 4:27 PM EDT, 2 hours 1 minute before

Special Weather Statement
National Weather Service State College PA
427 PM EDT Wed Jul 21 2021

PAZ052-057>059-212100-
Northumberland PA-Lebanon PA-Dauphin PA-Schuylkill PA-
427 PM EDT Wed Jul 21 2021

...STRONG THUNDERSTORMS WILL AFFECT PARTS OF NORTHUMBERLAND...
LEBANON...DAUPHIN...AND SCHUYLKILL COUNTIES UNTIL 500 PM EDT...

At 426 PM EDT, Doppler radar indicated strong thunderstorms along a
line extending from Lavelle to near Elizabethville. Movement was
southeast at 30 mph.

Penny size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Pottsville, Colonial Park, Progress, Linglestown, Mount Carmel,
Schuylkill Haven, Minersville, Kulpmont, Ashland, Paxtonia, Skyline
View, Valley View, Millersburg, Pine Grove, Lykens, Tremont,
Elizabethville, Williamstown, Fredericksburg and Tower City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms 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 4053 7617 4052 7626 4052 7634 4049 7644
      4046 7638 4029 7687 4060 7696 4082 7641
      4081 7639 4077 7638 4078 7636 4057 7607
TIME...MOT...LOC 2026Z 328DEG 27KT 4077 7640 4060 7688

Banghoff

Special weather statement, Jul 21, 5:02 PM EDT, 1 hour 26 minutes before

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Special weather statement, Jul 21, 5:30 PM EDT, 58 minutes before

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Special weather statement, Jul 21, 6:28 PM 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
Jul 20, 10:08 PM EDT	Areal Flood Advisory	CTP	Tioga	2 hr
Jul 21, 12:25 AM EDT	Special Weather Statement	CTP	McKean	50 min
Jul 21, 12:58 AM EDT	Special Weather Statement	CTP	Potter	47 min
Jul 21, 8:33 AM EDT	Special Weather Statement	CTP	Snyder	27 min
Jul 21, 9:03 AM EDT	Special Weather Statement	CTP	Snyder	27 min
Jul 21, 10:22 AM EDT	Special Weather Statement	CTP	Huntingdon	38 min
Jul 21, 11:00 AM EDT	Special Weather Statement	CTP	Franklin	45 min
Jul 21, 11:40 AM EDT	Special Weather Statement	CTP	Franklin	35 min
Jul 21, 11:59 AM EDT	Special Weather Statement	CTP	Northumberland, Snyder	31 min
Jul 21, 12:06 PM EDT	Special Weather Statement	CTP	Franklin	24 min
Jul 21, 12:22 PM EDT	Special Weather Statement	CTP	Lebanon	38 min
Jul 21, 12:28 PM EDT	Special Weather Statement	CTP	Northumberland	32 min
Jul 21, 12:31 PM EDT	Special Weather Statement	CTP	Adams	29 min
Jul 21, 12:38 PM EDT	Special Weather Statement	CTP	Schuylkill	52 min
Jul 21, 12:55 PM EDT	Special Weather Statement	CTP	Dauphin	35 min
Jul 21, 1:00 PM EDT	Special Weather Statement	CTP	Adams	45 min
Jul 21, 1:13 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Jul 21, 1:16 PM EDT	Special Weather Statement	CTP	Franklin	29 min
Jul 21, 1:22 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	38 min
Jul 21, 1:29 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	31 min
Jul 21, 1:35 PM EDT	Special Weather Statement	CTP	Lancaster	25 min
Jul 21, 2:00 PM EDT	Special Weather Statement	CTP	Lancaster	45 min
Jul 21, 2:24 PM EDT	Special Weather Statement	CTP	Lancaster	36 min
Jul 21, 2:28 PM EDT	Special Weather Statement	CTP	York	32 min
Jul 21, 2:35 PM EDT	Special Weather Statement	CTP	Lancaster	40 min
Jul 21, 2:52 PM EDT	Special Weather Statement	CTP	Lancaster	38 min
Jul 21, 2:53 PM EDT	Special Weather Statement	CTP	Union	37 min
Jul 21, 3:25 PM EDT	Special Weather Statement	CTP	York	35 min
Jul 21, 4:00 PM EDT	Special Weather Statement	CTP	York	45 min
Jul 21, 4:02 PM EDT	Special Weather Statement	CTP	Snyder	28 min
Jul 21, 4:27 PM EDT	Special Weather Statement	CTP	Dauphin	33 min
Jul 21, 5:02 PM EDT	Special Weather Statement	CTP	Lebanon	28 min
Jul 21, 5:30 PM EDT	Special Weather Statement	CTP	Lebanon	30 min

Nearby

Special Weather Statements in Pennsylvania, 2021 Every special weather statement in 2021

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.