Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS State College, PA

May 12, 20184 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 12, 2018, 4:12 PM EDT for 4 counties in Pennsylvania. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 12, 2018, 4:12 PM EDT (20:12 UTC)
Expired: May 12, 2018, 5:15 PM EDT
In force: 63 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bedford County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA

The radar

The State College radar (KCCX), 81 km from the middle of the area, began a volume at 20:11 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.

What was reported inside it

Time	Report	Where	Remark
May 12, 4:29 PM EDT	TSTM WND DMG	Coaldale, PA	TREES AND WIRES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 12, 2:47 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 145 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

948 
WUUS51 KCTP 122012
SVRCTP
PAC009-055-057-061-122115-
/O.NEW.KCTP.SV.W.0021.180512T2012Z-180512T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
412 PM EDT SAT MAY 12 2018

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northeastern Bedford County in south central Pennsylvania...
  Southern Huntingdon County in central Pennsylvania...
  Central Franklin County in south central Pennsylvania...
  Northeastern Fulton County in south central Pennsylvania...

* Until 515 PM EDT

* At 411 PM EDT, a severe thunderstorm was located near New
  Enterprise, moving east at 50 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is possible. Expect wind damage 
           to trees and power lines.

* Locations impacted include...
  Chambersburg, Waterfall, Dudley, New Enterprise, Harrisonville,
  Willow Hill, Entriken, Fannettsburg, Saluvia and Roxbury.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 165 to 201.
 Interstate 81 from mile markers 14 to 15.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near an area lake, get away from the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4007 7850 4028 7837 4025 7829 4034 7823
      4035 7774 4027 7771 4027 7770 4029 7767
      4022 7765 4023 7761 4021 7760 4018 7762
      4009 7755 3990 7765
TIME...MOT...LOC 2011Z 276DEG 43KT 4020 7830 

HAIL...1.00IN
WIND...60MPH
 
$$

Lambert

1 follow-up statement

161 
WWUS51 KCTP 122045
SVSCTP

Severe Weather Statement
National Weather Service State College PA
445 PM EDT SAT MAY 12 2018

PAC009-122053-
/O.CAN.KCTP.SV.W.0021.000000T0000Z-180512T2115Z/
Bedford PA-
445 PM EDT SAT MAY 12 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BEDFORD COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved 
southeast and out of the warned area. Therefore, the warning has 
been cancelled.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
south central and central Pennsylvania.

LAT...LON 4000 7814 4006 7819 4016 7813 4021 7804
      4021 7788 4019 7777 4015 7761 4009 7755
      3990 7765
TIME...MOT...LOC 2043Z 287DEG 38KT 4006 7799 

$$

PAC055-057-061-122115-
/O.CON.KCTP.SV.W.0021.000000T0000Z-180512T2115Z/
Huntingdon PA-Franklin PA-Fulton PA-
445 PM EDT SAT MAY 12 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHEASTERN HUNTINGDON...CENTRAL FRANKLIN AND NORTHEASTERN
FULTON COUNTIES...

At 443 PM EDT, a severe thunderstorm was located over Fort Littleton,
moving east southeast at 45 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Chambersburg, Saluvia, Waterfall, Roxbury, Wells Tannery, Upper
Strasburg, Harrisonville, Willow Hill, Fort Littleton and Sideling
Hill Rest Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4000 7814 4006 7819 4016 7813 4021 7804
      4021 7788 4019 7777 4015 7761 4009 7755
      3990 7765
TIME...MOT...LOC 2043Z 287DEG 38KT 4006 7799 

HAIL...0.75IN
WIND...60MPH
 
$$

Lambert

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 12:06 AM EDT	Special Weather Statement	CTP	Cambria	54 min
May 12, 2:13 PM EDT	Areal Flood Advisory	CTP	Cameron, Clinton, Elk, Lycoming, McKean, Potter and 3 more	5 hr
May 12, 3:17 PM EDT	Special Weather Statement	CTP	Blair, Cambria	43 min
May 12, 3:23 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	67 min
May 12, 3:50 PM EDT	Special Weather Statement	CTP	Huntingdon	55 min
May 12, 4:19 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	56 min
May 12, 4:52 PM EDT	Special Weather Statement	CTP	Somerset	53 min
May 12, 4:58 PM EDT	Special Weather Statement	CTP	Blair, Mifflin, Snyder	32 min
May 12, 5:22 PM EDT	Special Weather Statement	CTP	Juniata, Perry	23 min
May 12, 5:40 PM EDT	Special Weather Statement	CTP	Juniata, Perry	35 min
May 12, 5:48 PM EDT	Areal Flood Advisory	CTP	Bedford, Blair, Cambria, Huntingdon, Somerset	3 hr
May 12, 5:52 PM EDT	Special Weather Statement	CTP	Franklin	53 min
May 12, 6:01 PM EDT	Special Weather Statement	CTP	York	44 min
May 12, 6:08 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	52 min
May 12, 6:12 PM EDT	Special Weather Statement	CTP	Blair, Cambria	48 min
May 12, 6:16 PM EDT	Special Weather Statement	CTP	Dauphin, Perry	29 min
May 12, 6:21 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Cambria, Somerset	39 min
May 12, 6:27 PM EDT	Special Weather Statement	CTP	Adams	48 min
May 12, 6:33 PM EDT	Special Weather Statement	CTP	Blair, Huntingdon	27 min
May 12, 6:39 PM EDT	Special Weather Statement	CTP	Somerset	51 min
May 12, 6:52 PM EDT	Severe Thunderstorm Warning	CTP	Adams, York	53 min
May 12, 6:53 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	37 min
May 12, 7:03 PM EDT	Special Weather Statement	CTP	Bedford, Cumberland, Franklin, Fulton	42 min
May 12, 7:18 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	57 min
May 12, 7:48 PM EDT	Special Weather Statement	CTP	York	42 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2018 Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.