Alert archive / Pennsylvania / Special Weather Statements in 2019
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Aug 8, 2019, 6:49 PM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2019, 6:49 PM EDT (22:49 UTC)
- Expired
- Aug 8, 2019, 7:15 PM EDT
- In force
- 26 min
- Issued by
- NWS Philadelphia/Mount Holly
Counties Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 106 km from the middle of the area, began a volume at 22:50 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.8 hours before the alert went out and 203 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
- 606 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
327
WWUS81 KPHI 082249
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
649 PM EDT Thu Aug 8 2019
DEZ001-NJZ009-PAZ061-062-070-101>106-082315-
New Castle-Hunterdon-Lower Bucks-Upper Bucks-Lehigh-Eastern
Montgomery-Western Montgomery-Delaware-Western Chester-Eastern
Chester-Northampton-
649 PM EDT Thu Aug 8 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN NEW
CASTLE...SOUTHWESTERN HUNTERDON...MONTGOMERY...SOUTHEASTERN LEHIGH...
NORTHWESTERN BUCKS...CHESTER...NORTHWESTERN DELAWARE AND SOUTH
CENTRAL NORTHAMPTON COUNTIES...
At 649 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Emmaus to near Chester Springs to
Mount Vernon. Movement was east at 40 mph.
Wind gusts up to 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
Allentown, West Chester, Bethlehem, Norristown, Pottstown,
Phoenixville, Lansdale, West Norriton, East Norriton, Coatesville,
Emmaus, Westtown, Quakertown, Perkasie, Doylestown, Downingtown,
Conshohocken, Souderton, Bedminster and Ambler.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3983 7604 3987 7599 3991 7600 4010 7575
4035 7562 4044 7553 4046 7555 4061 7547
4062 7520 4059 7518 4062 7516 4062 7496
4006 7528 3970 7577 3972 7579 3972 7587
3976 7606
TIME...MOT...LOC 2249Z 274DEG 37KT 4054 7544 4011 7569 3983 7605
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 3:56 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 104 min |
| Aug 8, 5:01 PM EDT | Special Weather Statement | PHI | Burlington | 29 min |
| Aug 8, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 23 min |
| Aug 8, 5:50 PM EDT | Special Marine Warning | PHI | 20 min | |
| Aug 8, 6:14 PM EDT | Special Weather Statement | PHI | Sussex, Warren | 31 min |
| Aug 8, 6:39 PM EDT | Special Weather Statement | PHI | Sussex, Warren | 36 min |
| Aug 8, 7:00 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 8, 7:01 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 44 min |
| Aug 8, 7:12 PM EDT | Special Weather Statement | PHI | Hunterdon | 33 min |
| Aug 8, 7:40 PM EDT | Special Weather Statement | PHI | Salem | 35 min |
| Aug 8, 7:49 PM EDT | Special Weather Statement | PHI | Morris | 26 min |
| Aug 7, 10:36 PM EDT | Areal Flood Warning | PHI | Philadelphia | 87 min |
| Aug 8, 5:31 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 44 min |
Nearby
Special Weather Statements in Pennsylvania, 2019Every special weather statement in 2019
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.