Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS State College, PA

July 20, 2021Clinton County, Pennsylvania

NWS State College, PA issued this special weather statement at Jul 20, 2021, 5:13 PM EDT for Clinton County, Pennsylvania. It was in force for 17 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 20, 2021, 5:13 PM EDT (21:13 UTC)
Expired
Jul 20, 2021, 5:30 PM EDT
In force
17 min
Issued by
NWS State College, PA

County Clinton County, PA

The radar

The State College radar (KCCX), 39 km from the middle of the area, began a volume at 21:16 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, 9.2 hours before the alert went out and 225 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 2021-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 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 2021-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
66 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
852 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

652 
WWUS81 KCTP 202113
SPSCTP

Special Weather Statement
National Weather Service State College PA
513 PM EDT Tue Jul 20 2021
 
PAZ019-045-202130-
Southern Clinton PA-Southern Centre PA-
513 PM EDT Tue Jul 20 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SOUTHERN CLINTON AND
SOUTHERN CENTRE COUNTIES UNTIL 530 PM EDT...

At 512 PM EDT, Doppler radar indicated a strong thunderstorm over
Lamar, moving southeast at 10 mph.

Small hail and wind gusts up to 50 mph are possible.

Locations impacted include...
Lamar, Blanchard, Mackeyville, Bald Eagle State Park and Beech Creek.

LAT...LON 4106 7766 4110 7760 4105 7737 4096 7755
TIME...MOT...LOC 2112Z 302DEG 8KT 4105 7755 

$$

KF

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 19, 8:00 PM EDTSpecial Weather StatementCTPMifflin15 min
Jul 20, 6:20 PM EDTSpecial Weather StatementCTPWarren25 min
Jul 20, 6:49 PM EDTSpecial Weather StatementCTPWarren41 min
Jul 20, 7:17 PM EDTSpecial Weather StatementCTPWarren28 min
Jul 20, 7:46 PM EDTSpecial Weather StatementCTPMcKean59 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.