Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 127, NWS Philadelphia/Mount Holly

October 4, 2000Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 4, 2000, 7:57 PM EDT for Chester County, Pennsylvania. It was in force for 33 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Oct 4, 2000, 7:57 PM EDT (23:57 UTC)
Expired: Oct 4, 2000, 8:30 PM EDT
In force: 33 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Chester County, PA

What was reported inside it

Time	Report	Where	Remark
Oct 4, 8:00 PM EDT	Thunderstorm Wind 50 E	Coatesville, PA
Oct 4, 8:00 PM EDT	Hail 1	Coatesville, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 12.0 hours before the alert went out and 64 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: 1287 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

219 
WUUS51 KPHI 042357
SVRPHL
PAC029-050030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
757 PM EDT WED OCT 4 2000

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING EXTENDED FOR...
  CENTRAL AND SOUTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA.

* UNTIL 830 PM EDT.

* AT 754 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... OVER COATESVILLE...MOVING SOUTHEAST AT 85
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PAOLI...WEST CHESTER AT 805 PM.

HAIL UP TO ONE INCH IN DIAMETER AND WINDS GREATER THAN 55 MILES AN
HOUR ARE EXPECTED FROM THIS STORM. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...SEEK SHELTER
IMMEDIATELY

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

$$

LAT...LON 4002 7601 3986 7568 4004 7541 4009 7594

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 4, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks	33 min
Oct 4, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks	36 min
Oct 4, 6:34 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	41 min
Oct 4, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	35 min
Oct 4, 7:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Oct 4, 7:19 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2000 Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.