Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 95, NWS Cleveland, OH

August 12, 2021Crawford County, Pennsylvania

NWS Cleveland, OH issued this severe thunderstorm warning at Aug 12, 2021, 4:58 PM EDT for Crawford County, Pennsylvania. It was in force for 47 min. 2 reports 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: Aug 12, 2021, 4:58 PM EDT (20:58 UTC)
Expired: Aug 12, 2021, 5:45 PM EDT
In force: 47 min
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Crawford County, PA

The radar

The Pittsburgh radar (KPBZ), 128 km from the middle of the area, began a volume at 21:01 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
Aug 12, 5:14 PM EDT	HAIL 1.75	Hydetown, PA	DELAYED REPORT. APPROXIMATELY GOLF BALL-SIZE HAIL PER PHOTO. TIME ESTIMATED VIA RADAR.
Aug 12, 5:18 PM EDT	HAIL 1.75	2 Nne Titusville, PA	DELAYED REPORT. APPROXIMATELY GOLF BALL-SIZE HAIL PER PHOTO. TIME ESTIMATED VIA RADAR.

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
Aug 12, 3:48 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.0 hours before the alert went out and 139 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: 1075 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

876 
WUUS51 KCLE 122058
SVRCLE
PAC039-122145-
/O.NEW.KCLE.SV.W.0095.210812T2058Z-210812T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cleveland OH
458 PM EDT Thu Aug 12 2021

The National Weather Service in Cleveland has issued a

* Severe Thunderstorm Warning for...
  East central Crawford County in northwestern Pennsylvania...

* Until 545 PM EDT.

* At 458 PM EDT, a severe thunderstorm was located 7 miles east of
  Guys Mills, or 14 miles northwest of Oil City, moving northeast at
  25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Titusville, Hydetown and Townville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4162 7982 4157 7988 4157 7989 4168 7992
      4181 7962 4162 7961
TIME...MOT...LOC 2058Z 230DEG 20KT 4161 7983 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Campbell

The office that day

Everything else NWS Cleveland, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 11:01 AM EDT	Severe Thunderstorm Warning Considerable damage threat	CLE	Crawford	40 min
Aug 12, 5:06 PM EDT	Severe Thunderstorm Warning	CLE	Crawford	39 min
Aug 12, 5:36 PM EDT	Severe Thunderstorm Warning	CLE	Crawford	39 min
Aug 12, 6:31 PM EDT	Areal Flood Advisory	CLE	Crawford	2 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.