Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 133, NWS Philadelphia/Mount Holly

July 14, 2004Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2004, 4:44 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 61 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: Jul 14, 2004, 4:44 PM EDT (20:44 UTC)
Expired: Jul 14, 2004, 5:45 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 20:44 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
Jul 14, 5:20 PM EDT	TSTM WND DMG	Hatfield, PA	LARGE LIMBS DOWNED.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.7 hours before the alert went out and 124 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 142044
SVRPHI
PAC017-091-142145-

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA
  NORTHERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 545 PM EDT

* AT 443 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 
  GILBERTSVILLE...AND MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SPRING MOUNT BY 450 PM EDT...
  SOUDERTON BY 500 PM EDT...
  LANSDALE AND PERKASIE BY 505 PM EDT...
  CHALFONT BY 515 PM EDT...
  DOYLESTOWN BY 520 PM EDT...
  IVYLAND BY 525 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 4055 7518 4055 7508 4043 7507 4039 7497
      4032 7493 4014 7473 4004 7498 4011 7496
      4016 7505 4023 7560 4024 7565 4029 7565
      4041 7556 4041 7549 4052 7537 4061 7521

$$

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, 4:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks	65 min
Jul 14, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Chester	66 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.