Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 280, NWS Philadelphia/Mount Holly

December 1, 2006Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Dec 1, 2006, 5:45 PM EST for Lehigh County, Northampton County, Pennsylvania. It was in force for 42 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: Dec 1, 2006, 5:45 PM EST (22:45 UTC)
Expired: Dec 1, 2006, 6:27 PM EST
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 22:45 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
Dec 1, 6:00 PM EST	TSTM WND DMG	Ne East Bangor, PA	TREES AND WIRES REPORTED DOWN IN UPPER MOUNT BETHEL TOWNSHIP.

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
Dec 1, 3:24 PM EST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 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: 966 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -103 m²/s²
0-3 km storm-relative helicity: 9 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 012245
SVRPHI
PAC077-095-012345-
/O.NEW.KPHI.SV.W.0280.061201T2245Z-061201T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
545 PM EST FRI DEC 1 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF BETHLEHEM...

* UNTIL 645 PM EST

* AT 541 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 8 MILES NORTH OF EAST BANGOR TO 6 MILES WEST OF ANCIENT
  OAKS...OR ALONG A LINE EXTENDING FROM 27 MILES NORTH OF BETHLEHEM
  TO 13 MILES SOUTHWEST OF ALLENTOWN...AND MOVING EAST AT 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NAZARETH...EMMAUS...EAST BANGOR AND BELFAST BY 550 PM EST...
  HELLERTOWN AND BETHLEHEM BY 555 PM EST...
  OLD ORCHARD AND EASTON BY 600 PM EST...

LAT...LON 4062 7577 4045 7552 4062 7518 4078 7521
      4095 7515

$$

NIERENBERG

1 follow-up statement

000 
WWUS51 KPHI 012327
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
626 PM EST FRI DEC 1 2006

PAC077-095-012336-
/O.CAN.KPHI.SV.W.0280.000000T0000Z-061201T2345Z/
LEHIGH PA-NORTHAMPTON PA-
626 PM EST FRI DEC 1 2006

...THE SEVERE THUNDERSTORM WARNING FOR NORTHAMPTON AND LEHIGH
COUNTIES IS CANCELLED...

THE LINE OF DAMAGING WIND THUNDERSTORMS HAS MOVED EAST OF THE 
REGION. GUSTY WEST TO NORTHWEST WIND THOUGH WILL CONTINUE THROUGH 
THE EVENING, BUT AT LESSER SPEEDS THAN WHAT OCCURRED WITH THE 
THUNDERSTORM LINE. 

LAT...LON 4062 7577 4045 7552 4062 7518 4078 7521
      4095 7515

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 1, 3:54 AM EST	High Wind Warning	PHI	Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more	21 hr
Dec 1, 3:54 AM EST	Wind Advisory	PHI	Delaware, Philadelphia	21 hr
Dec 1, 4:27 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	78 min
Dec 1, 4:49 PM EST	Severe Thunderstorm Warning	PHI	Monroe, Northampton	71 min
Dec 1, 5:07 PM EST	Tornado Warning	PHI	Monroe	38 min
Dec 1, 5:55 PM EST	Tornado Warning	PHI	Northampton	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2006 Every severe thunderstorm warning in 2006

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.