Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS State College, PA

August 29, 2021Somerset County, Pennsylvania

NWS State College, PA issued this special weather statement at Aug 29, 2021, 7:45 PM EDT for Somerset County, Pennsylvania. It was in force for 15 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 29, 2021, 7:45 PM EDT (23:45 UTC)
Expired
Aug 29, 2021, 8:00 PM EDT
In force
15 min
Issued by
NWS State College, PA
Hail
0.00 in
Wind
55

County Somerset County, PA

The radar

The State College radar (KCCX), 137 km from the middle of the area, began a volume at 23:48 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 (KPIT), launched 12:00Z, 11.8 hours before the alert went out and 125 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2021-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 985 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2021-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
985 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
957 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
68 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 29, 7:34 PM EDT, 11 minutes earlier.

Area forecast discussion, Aug 29, 7:34 PM EDT, 11 minutes before
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Hazardous weather outlook, Aug 29, 4:58 AM EDT, 14 hours 47 minutes before
Hazardous Weather Outlook
National Weather Service State College PA
458 AM EDT Sun Aug 29 2021

PAZ028-036-042-046-049>053-056>059-063>066-300900-
Juniata-Franklin-Sullivan-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-
Adams-York-Lancaster-
458 AM EDT Sun Aug 29 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

We are continuing to monitor the potential for heavy rain and
flooding impacts Wednesday into Thursday in association with Ida.
The greatest risk appears to be over the southern part of central
Pennsylvania.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ004>006-010>012-017>019-024>027-033>035-037-041-045-300900-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Somerset-Bedford-Fulton-Tioga-Northern Lycoming-Southern Clinton-
458 AM EDT Sun Aug 29 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Slow-moving thunderstorms with locally heavy downpours could lead to
isolated minor flooding issues this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

We are continuing to monitor the potential for heavy rain and
flooding impacts Wednesday into Thursday in association with Ida.
The greatest risk appears to be over the southern part of central
Pennsylvania.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MRS

In the hours before

Special weather statement, Aug 29, 4:45 PM EDT, 3 hours before
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Local storm report, Aug 29, 5:13 PM EDT, 2 hours 32 minutes before
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Special weather statement, Aug 29, 6:36 PM EDT, 1 hour 9 minutes before
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Special weather statement, Aug 29, 6:50 PM EDT, 55 minutes before
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Special weather statement, Aug 29, 7:26 PM EDT, 19 minutes before
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Special weather statement, Aug 29, 7:45 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.

IssuedProductOfficeCountiesLasted
Aug 29, 4:24 PM EDTSpecial Weather StatementCTPClearfield21 min
Aug 29, 4:45 PM EDTSpecial Weather StatementCTPClearfield15 min
Aug 29, 5:00 PM EDTSevere Thunderstorm WarningCTPClearfield45 min
Aug 29, 6:02 PM EDTAreal Flood AdvisoryCTPSomerset58 min
Aug 29, 6:36 PM EDTSpecial Weather StatementCTPCambria24 min
Aug 29, 6:50 PM EDTSpecial Weather StatementCTPClearfield25 min
Aug 29, 7:26 PM EDTSpecial Weather StatementCTPSomerset19 min

Nearby

Special Weather Statements in Pennsylvania, 2021Every 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.