Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 128, NWS Philadelphia/Mount Holly

July 14, 2004Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2004, 4:10 PM EDT for Berks County, Pennsylvania. It was in force for 65 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 14, 2004, 4:10 PM EDT (20:10 UTC)
Expired: Jul 14, 2004, 5:15 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 20:13 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 14, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.2 hours before the alert went out and 109 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: 3 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 719 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KPHI 142010
SVRPHI
PAC011-142115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
410 PM EDT WED JUL 14 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA
  THIS INCLUDES THE CITY OF READING

* UNTIL 515 PM EDT

* AT 410 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR 
  READING...AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  AMITY GARDENS BY 420 PM EDT...
  BOYERTOWN BY 425 PM EDT...
  BECHTELSVILLE AND BALLY BY 430 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4045 7554 4043 7554 4027 7569 4026 7572
      4025 7595 4042 7599 4047 7566 4048 7565
      4048 7559

$$

IOVINO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 2:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	53 min
Jul 14, 3:05 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Philadelphia	76 days
Jul 14, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
Jul 14, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Chester	66 min
Jul 14, 4:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	61 min
Jul 14, 5:01 PM EDT	Tornado Warning	PHI	Montgomery	29 min
Jul 14, 5:17 PM EDT	Special Marine Warning	PHI		103 min
Jul 14, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	64 min
Jul 14, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min
Jul 14, 5:51 PM EDT	Flash Flood Warning	PHI	Bucks	2 hr
Jul 14, 6:01 PM EDT	Special Marine Warning	PHI		74 min
Jul 14, 6:39 PM EDT	Special Marine Warning	PHI		66 min
Jul 14, 6:39 PM EDT	Special Marine Warning	PHI		66 min
Jul 14, 6:46 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Jul 14, 7:00 PM EDT	Special Marine Warning	PHI		60 min
Jul 14, 7:38 PM EDT	Special Marine Warning	PHI		82 min
Jul 14, 7:38 PM EDT	Special Marine Warning	PHI		82 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2004 Every severe thunderstorm warning in 2004

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.