Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2023, 2:02 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 28 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
- Apr 15, 2023, 2:02 PM EDT (18:02 UTC)
- Expired
- Apr 15, 2023, 2:30 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Bucks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 18:02 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 |
|---|---|---|---|
| Apr 15, 2:20 PM EDT | HAIL 0.25 | Nazareth, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.0 hours before the alert went out and 212 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
- 26 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
338 WUUS51 KPHI 151802 SVRPHI PAC017-077-095-151830- /O.NEW.KPHI.SV.W.0031.230415T1802Z-230415T1830Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Mount Holly NJ 202 PM EDT Sat Apr 15 2023 The National Weather Service in Mount Holly NJ has issued a * Severe Thunderstorm Warning for... Southeastern Lehigh County in eastern Pennsylvania... Northwestern Bucks County in southeastern Pennsylvania... South central Northampton County in eastern Pennsylvania... * Until 230 PM EDT. * At 201 PM EDT, a severe thunderstorm was located over Hellertown, or near Allentown, moving north at 20 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Minor damage to vehicles is possible. * Locations impacted include... Allentown, Easton, Bethlehem, Wilson, Hellertown, Nazareth, Bath, Tatamy, Steuben, Pleasant Valley, Springtown, Old Orchard, Lehigh University, Catasauqua, Fountain Hill, North Catasauqua, Freemansburg, Coopersburg, Palmer Heights and Eastlawn Gardens. This includes Interstate 78 in Pennsylvania between mile markers 60 and 73. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4050 7529 4049 7548 4075 7546 4074 7523 TIME...MOT...LOC 1801Z 188DEG 15KT 4058 7536 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ MLB
2 follow-up statements
377 WWUS51 KPHI 151819 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 219 PM EDT Sat Apr 15 2023 PAC017-077-095-151830- /O.CON.KPHI.SV.W.0031.000000T0000Z-230415T1830Z/ Lehigh PA-Bucks PA-Northampton PA- 219 PM EDT Sat Apr 15 2023 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT FOR SOUTHEASTERN LEHIGH...NORTHWESTERN BUCKS AND SOUTH CENTRAL NORTHAMPTON COUNTIES... At 219 PM EDT, a severe thunderstorm was located over Bethlehem, or near Easton, moving north at 15 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Minor damage to vehicles is possible. Locations impacted include... Allentown, Easton, Bethlehem, Wilson, Hellertown, Nazareth, Bath, Tatamy, Steuben, Pleasant Valley, Springtown, Old Orchard, Lehigh University, Catasauqua, Fountain Hill, North Catasauqua, Freemansburg, Coopersburg, Palmer Heights and Eastlawn Gardens. This includes Interstate 78 in Pennsylvania between mile markers 60 and 73. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4050 7529 4049 7548 4075 7546 4074 7523 TIME...MOT...LOC 1819Z 188DEG 15KT 4066 7535 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ MLB
599
WWUS51 KPHI 151827 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
227 PM EDT Sat Apr 15 2023
PAC017-077-095-151837-
/O.EXP.KPHI.SV.W.0031.000000T0000Z-230415T1830Z/
Lehigh PA-Bucks PA-Northampton PA-
227 PM EDT Sat Apr 15 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH...
NORTHWESTERN BUCKS AND SOUTH CENTRAL NORTHAMPTON COUNTIES WILL EXPIRE
AT 230 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4050 7529 4049 7548 4075 7546 4074 7523
TIME...MOT...LOC 1827Z 188DEG 15KT 4069 7534
$$
MLBThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 12:42 PM EDT | Special Weather Statement | PHI | Northampton | 48 min |
| Apr 15, 1:03 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 27 min |
| Apr 15, 1:22 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 4 hr |
| Apr 15, 1:34 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 26 min |
| Apr 15, 1:51 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 24 min |
| Apr 15, 1:58 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 32 min |
| Apr 15, 2:17 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Apr 15, 4:05 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 25 min |
| Apr 15, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 14 min |
| Apr 15, 5:20 PM EDT | Flash Flood Warning | PHI | Lehigh | 3 hr |
| Apr 15, 6:05 PM EDT | Areal Flood Advisory | PHI | Bucks | 96 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023
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.