Alert archive / Pennsylvania / Tornado Warnings in 2011
Tornado Warning 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at May 23, 2011, 7:58 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 32 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
- May 23, 2011, 7:58 PM EDT (23:58 UTC)
- Expired
- May 23, 2011, 8:30 PM EDT
- In force
- 32 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 00:03 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 |
|---|---|---|---|
| May 23, 8:15 PM EDT | FUNNEL CLOUD | Lower Nazareth Twp, PA | |
| May 23, 8:20 PM EDT | TSTM WND GST 68 | Forks Twp, PA |
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, 12.0 hours before the alert went out and 153 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 530 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
096 WFUS51 KPHI 232358 TORPHI NJC019-041-PAC017-077-095-240030- /O.NEW.KPHI.TO.W.0008.110523T2358Z-110524T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 758 PM EDT MON MAY 23 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA... CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA... THIS INCLUDES THE CITY OF EASTON... EXTREME WEST CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY... SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY... NORTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 830 PM EDT * AT 754 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR NORTHAMPTON...OR 8 MILES NORTH OF ALLENTOWN...MOVING EAST AT 20 MPH. * THE TORNADO WILL BE NEAR... BATH BY 810 PM EDT... BETHLEHEM BY 815 PM EDT... NAZARETH AND 6 MILES NORTH OF HELLERTOWN BY 820 PM EDT... OLD ORCHARD AND TATAMY BY 825 PM EDT... GLENDON...WILSON...EASTON AND FORKS BY 830 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING UP TO TWO INCH SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. && LAT...LON 4074 7505 4052 7512 4063 7557 4080 7552 TIME...MOT...LOC 2357Z 283DEG 19KT 4070 7547 $$
1 follow-up statement
292
WWUS51 KPHI 240024
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
824 PM EDT MON MAY 23 2011
PAC017-077-240034-
/O.CAN.KPHI.TO.W.0008.000000T0000Z-110524T0030Z/
LEHIGH PA-BUCKS PA-
824 PM EDT MON MAY 23 2011
...THE TORNADO WARNING FOR NORTH CENTRAL BUCKS AND EAST CENTRAL
LEHIGH COUNTIES IS CANCELLED...
LAT...LON 4071 7508 4056 7515 4057 7520 4060 7519
4062 7520 4059 7526 4061 7537 4076 7530
TIME...MOT...LOC 0024Z 283DEG 19KT 4067 7529
$$
NJC019-041-PAC095-240030-
/O.CON.KPHI.TO.W.0008.000000T0000Z-110524T0030Z/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-
824 PM EDT MON MAY 23 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR SOUTH
CENTRAL NORTHAMPTON...EXTREME WEST CENTRAL HUNTERDON AND SOUTHWESTERN
WARREN COUNTIES...
AT 820 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR PALMER HEIGHTS...
OR NEAR EASTON...MOVING EAST AT 20 MPH.
THE TORNADO WILL BE NEAR...
OLD ORCHARD...GLENDON...WEST EASTON AND WILSON BY 830 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
&&
LAT...LON 4071 7508 4056 7515 4057 7520 4060 7519
4062 7520 4059 7526 4061 7537 4076 7530
TIME...MOT...LOC 0024Z 283DEG 19KT 4067 7529
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 5:35 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 55 min |
| May 23, 5:47 PM EDT | Special Weather Statement | PHI | Berks | 43 min |
| May 23, 6:21 PM EDT | Special Weather Statement | PHI | Berks, Chester, Montgomery | 54 min |
| May 23, 6:30 PM EDT | Special Weather Statement | PHI | Carbon, Northampton | 60 min |
| May 23, 7:22 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 38 min |
| May 23, 7:30 PM EDT | Tornado Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 30 min |
| May 23, 11:07 AM EDT | Special Weather Statement | PHI | Atlantic | 53 min |
Nearby
Tornado Warnings in Pennsylvania, 2011Tornado Warnings in New Jersey, 2011Every tornado warning in 2011Tornadoes in 2011
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.