Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 118, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 13, 1996, 6:15 PM EDT for Montgomery County, Pennsylvania. It was in force for 30 min. 1 report 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
- Sep 13, 1996, 6:15 PM EDT (22:15 UTC)
- Expired
- Sep 13, 1996, 6:45 PM EDT
- In force
- 30 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 22:14 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 |
|---|---|---|---|
| Sep 13, 6:30 PM EDT | Thunderstorm Wind | Lansdale, 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 224 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
- 20 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 639 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- -136 m²/s²
- 0-3 km storm-relative helicity
- -42 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 132216 SVRPHL PAC091-132245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 615 PM EDT FRI SEP 13 1996 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY NJ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN PENNSYLVANIA ...MONTGOMERY COUNTY AT 611 PM EDT...A SEVERE THUNDERSTORM WAS INDICATED BY NWS DOPPLER RADAR AND SPOTTER REPORTS 3 MILES SOUTHWEST OF OAKS MOVING NORTHEAST AT 35 MPH. THIS STORM MAY AFFECT THE FOLLOWING NEARBY AREAS... OAKS... MONT CLARE... AUDUBON... ROYERSFORD... KING OF PRUSSIA... COLLEGEVILLE... TRAPPE... BRIDGEPORT... LIMERICK... NORRISTOWN... GRATERFORD... WEST CONSHOHOCKEN... CONSHOHOCKEN... SCHWENKSVILLE... OBELISK... FREDERICK... HARLEYSVILLE... GWYNEDD VALLEY... LANSDALE... NORTH WALES... FLOURTOWN... FORT WASHINGTON... GREEN LANE... AMBLER AND HATFIELD. LARGE TREE BRANCHES WERE BROKEN BY THUNDERSTORM WINDS IN WEST CHESTER AT AROUND 550 PM. IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW. AFTER THE STORM HAS PASSED...REPORT ANY SEVERE WEATHER OR FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY AND HAVE THEM RELAY YOUR SEVERE WEATHER REPORT ON TO THE NATIONAL WEATHER SERVICE. SEVERE THUNDERSTORMS CONTAIN WINDS GREATER THAN 58 MILES AN HOUR... DIME SIZE HAIL OR LARGER...VERY HEAVY RAINS AND DEADLY LIGHTNING. STAY TUNED TO NOAA WEATHER RADIDO...THE VOICE OF THE NATIONAL WEATHER SERVICE...OR TO COMMERCIAL RADIO OR TELEVISION STATIONS FOR THE LATEST STORM INFORMATION. AMC/RWP &
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Sep 13, 3:16 PM EDT, 2 hours 59 minutes before
NJZ014-023>026-DEZ004-140400- SPECIAL WEATHER STATEMENT - HEAVY SURF NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 315 PM EDT FRI SEP 13 1996 ...HEAVY SURF IS POSSIBLE TONIGHT AND SATURDAY ALONG THE NEW JERSEY AND DELAWARE COASTS... SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR THE NEW JERSEY AND DELAWARE COASTS FOR TONIGHT AND SATURDAY. SWELLS GENERATED BY HURRICANE HORTENSE HAVE BEGUN TO AFFECT THE COASTAL WATERS TODAY AND WILL INCREASE OVERNIGHT INTO SATURDAY MORNING. THE HURRICANE...WHICH WAS SOME 450 MILES SOUTHEAST OF CAPE HATTERAS AT 11 AM...IS FORECAST MOVE NORTHWARD OVERNIGHT AND REACH A POINT ABOUT 350 MILES EAST OF ATLANTIC CITY EARLY SATURDAY MORNING. THE FORECAST TRACK IS SLIGHTLY EAST OF THAT TAKEN BY HURRICANE EDOUARD IN AUGUST SO THE EFFECTS ALONG THE COAST SHOULD BE SIMILAR OR SOMEWHAT LESS...ESPECIALLY SINCE HORTENSE IS ALSO FORECAST TO WEAKEN SOMEWHAT AS IT MOVES NORTHWARD OVER COLDER WATER. NONETHELESS...BOATERS AND SWIMMERS ALONG THE COAST ON SATURDAY SHOULD EXERCISE CAUTION AS LARGE SWELLS FROM HORTENSE WILL LIKELY CREATE ROUGH SURF AND POSSIBLY ALSO DANGEROUS RIP CURRENTS. IF YOU ARE CAUGHT IN A RIP CURRENT...DON/T SWIM TOWARD SHORE FIGHTING THE CURRENT. INSTEAD SWIM PARALLEL TO SHORE UNTIL YOU ESCAPE THE CURRENT. CONDITIONS WILL IMPROVE LATE SATURDAY INTO SUNDAY AS HURRICANE HORTENSE MOVES RAPIDLY AWAY TO THE NORTHEAST. THERE WERE NO REPORTS OF TIDAL FLOODING AROUND THE TIME OF HIGH TIDE THIS MORNING. WINDS ALONG THE SHORE HAVE SHIFTED TO THE SOUTHWEST AND WILL BECOME WESTERLY THIS EVENING. TIDES WHICH HAVE BEEN RUNNING AROUND 1 AND 1/2 FEET ABOVE NORMAL SHOULD BEGIN DECREASE AND EVEN MINOR FLOODING SEEMS UNLIKEjLY THIS EVENING. STAY TUNED TO NOAA WEATHER RADIO...THE VOICE OF THE NATIONAL WEATHER SERVICE...FOR THE LATEST WEATHER INFORMATION. AMC/NATIONAL WEATHER SERVICE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 5:37 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 48 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1996Every severe thunderstorm warning in 1996
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; radar from the NEXRAD Level II archive.