Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 186, NWS State College, PA

July 28, 2021York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 28, 2021, 5:02 PM EDT for York County, Pennsylvania. It was in force for 43 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 28, 2021, 5:02 PM EDT (21:02 UTC)
Expired: Jul 28, 2021, 5:45 PM EDT
In force: 43 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County York County, PA

The radar

The Sterling radar (KLWX), 119 km from the middle of the area, began a volume at 21:04 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, 9.0 hours before the alert went out and 117 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: 110 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 1694 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

688 
WUUS51 KCTP 282102
SVRCTP
PAC133-282145-
/O.NEW.KCTP.SV.W.0186.210728T2102Z-210728T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
502 PM EDT Wed Jul 28 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  South central York County in south central Pennsylvania...

* Until 545 PM EDT.

* At 502 PM EDT, a severe thunderstorm was located over Jacobus,
  moving southeast at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Spry, Dallastown, Shrewsbury, Tyler Run-Queens Gate, Stewartstown,
  Glen Rock, Jacobus, Cross Roads, Railroad, Loganville and
  Winterstown.

This includes Interstate 83 from mile markers 0 to 15.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3992 7674 3993 7669 3972 7646 3972 7671
TIME...MOT...LOC 2102Z 332DEG 16KT 3989 7671 

HAIL...<.75IN
WIND...60MPH
 
$$

DeVoir

2 follow-up statements

090 
WWUS51 KCTP 282116
SVSCTP

Severe Weather Statement
National Weather Service State College PA
516 PM EDT Wed Jul 28 2021

PAC133-282145-
/O.CON.KCTP.SV.W.0186.000000T0000Z-210728T2145Z/
York PA-
516 PM EDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTH CENTRAL YORK COUNTY...

At 516 PM EDT, a severe thunderstorm was located near Shrewsbury,
moving southeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Shrewsbury, Stewartstown, Railroad and Winterstown. 

This includes Interstate 83 from mile markers 0 to 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3982 7668 3984 7664 3972 7646 3972 7671
TIME...MOT...LOC 2116Z 330DEG 20KT 3981 7665 

HAIL...<.75IN
WIND...60MPH
 
$$

DeVoir

763 
WWUS51 KCTP 282138
SVSCTP

Severe Weather Statement
National Weather Service State College PA
538 PM EDT Wed Jul 28 2021

PAC133-282148-
/O.EXP.KCTP.SV.W.0186.000000T0000Z-210728T2145Z/
York PA-
538 PM EDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL YORK COUNTY WILL
EXPIRE AT 545 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3982 7668 3984 7664 3972 7646 3972 7671
TIME...MOT...LOC 2138Z 332DEG 16KT 3973 7660 

$$

DeVoir

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 4:42 PM EDT	Special Weather Statement	CTP	Somerset	48 min
Jul 28, 4:43 PM EDT	Special Weather Statement	CTP	York	47 min
Jul 28, 5:35 PM EDT	Special Weather Statement	CTP	Franklin	55 min
Jul 28, 6:22 PM EDT	Special Weather Statement	CTP	Franklin	38 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning 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.