Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 7, 1999, 8:09 PM EDT for Berks County, Pennsylvania. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 7, 1999, 8:09 PM EDT (00:09 UTC)
- Expired
- Jun 7, 1999, 8:40 PM EDT
- In force
- 31 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Berks County, PA
The radar
The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 00:12 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 00:00Z, 0.2 hours before the alert went out and 206 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
- 1850 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1787 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 2 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.
817 WUUS1 KPHL 080010 RRA SVRPHL PAC011-080040- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 809 PM EDT MON JUN 7 1999 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... BERKS COUNTY IN PENNSYLVANIA. * UNTIL 840 PM EDT. * AT 808 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF BERNVILLE... MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR... BERNVILLE AT 808 PM EDT. THIS IS A DANGEROUS STORM. MOVE INSIDE A STRONG BUILDING AND DO NOT STAND NEAR WINDOWS. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION OUTLET. .END JM/JE
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, Jun 7, 4:45 PM EDT, 3 hours 24 minutes before
PAZ067>071-NJZ015-017>019-DEZ001-090300- SPECIAL WEATHER STATEMENT...EXCESSIVE HEAT WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 445 PM EDT MON JUN 7 1999 ...AN EXCESSIVE HEAT WARNING FOR HIGHLY URBANIZED AREAS OF THE DELAWARE VALLEY REMAINS IN EFFECT THROUGH TUESDAY... THIS AFTERNOON...HEAT INDICES IN THE WARNING AREA GENERALLY PEAKED NEAR 105. TONIGHT WON/T BRING ALOT OF RELIEF...AS IT WILL BE WARM AND MUGGY. FOR TOMORROW...ALTHOUGH DEWPOINTS WILL GRADUALLY BEGIN TO FALL IN THE AFTERNOON...TEMPERATURES IN THE MID TO UPPER 90S WILL ONCE AGAIN CAUSE HEAT INDICES TO REACH AROUND 100. THE HEAT INDEX IS A MEASURE OF THE COMBINED EFFECTS OF HIGH HEAT AND HUMIDITY ON THE HUMAN BODY. PEOPLE IN URBANIZED AREAS THROUGHOUT THE PHILADELPHIA METROPOLITAN REGION SHOULD SEEK AIR-CONDITIONED RELIEF WHERE POSSIBLE. OTHERWISE MAINTAIN PROPER AIR CIRCULATION BY KEEPING WINDOWS OPEN AND BY USING FANS. IF YOU HAVE OUTDOOR WORK PLANNED FOR TOMORROW WHICH CAN/T BE POSTPONED...TRY TO FINISH IT IN THE MORNING. ALSO...REGARDLESS OF WHEN TOMORROW YOU WORK OUTDOORS...WEAR LOOSE-FITTING...LIGHT COLORED CLOTHING. TAKE FREQUENT BREAKS IN THE SHADE. TRY TO DRINK PLENTY OF WATER OR OTHER NON-ALCOHOLIC BEVERAGES. DON/T WAIT UNTIL YOU FEEL THIRSTY. ALSO...KEEP AN EYE ON ELDERLY FRIENDS AND RELATIVES SINCE THEY ARE THE MOST SUSCEPTIBLE TO HEAT-INDUCED ILLNESSES. PETS ALSO SUFFER DURING THESE HOT SPELLS. MAKE SURE TO GIVE THEM AMPLE WATER AND ACCESS TO SHADE. DON/T LEAVE ANYONE...ANY PERSON OR ANY PET...IN A PARKED AUTOMOBILE FOR ANY LENGTH OF TIME. FURTHER STATEMENTS WILL BE ISSUED THROUGH TUESDAY BY THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ. FOR THE LATEST INFORMATION ON THIS HOT SPELL PLEASE STAY TUNED TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TV STATIONS...OR YOUR CABLE TV OUTLET. WEATHER INFORMATION MAY ALSO BE FOUND ON THE NWS MOUNT HOLLY INTERNET HOME PAGE AT WWW.NWS.NOAA.GOV/ER/PHI. MPD
Special weather statement, Jun 7, 4:45 PM EDT, 3 hours 24 minutes before
PAZ067>071-NJZ015-017>019-DEZ001-090300- SPECIAL WEATHER STATEMENT...EXCESSIVE HEAT WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 445 PM EDT MON JUN 7 1999 ...AN EXCESSIVE HEAT WARNING FOR HIGHLY URBANIZED AREAS OF THE DELAWARE VALLEY REMAINS IN EFFECT THROUGH TUESDAY... THIS AFTERNOON...HEAT INDICES IN THE WARNING AREA GENERALLY PEAKED NEAR 105. TONIGHT WON/T BRING ALOT OF RELIEF...AS IT WILL BE WARM AND MUGGY. FOR TOMORROW...ALTHOUGH DEWPOINTS WILL GRADUALLY BEGIN TO FALL IN THE AFTERNOON...TEMPERATURES IN THE MID TO UPPER 90S WILL ONCE AGAIN CAUSE HEAT INDICES TO REACH AROUND 100. THE HEAT INDEX IS A MEASURE OF THE COMBINED EFFECTS OF HIGH HEAT AND HUMIDITY ON THE HUMAN BODY. PEOPLE IN URBANIZED AREAS THROUGHOUT THE PHILADELPHIA METROPOLITAN REGION SHOULD SEEK AIR-CONDITIONED RELIEF WHERE POSSIBLE. OTHERWISE MAINTAIN PROPER AIR CIRCULATION BY KEEPING WINDOWS OPEN AND BY USING FANS. IF YOU HAVE OUTDOOR WORK PLANNED FOR TOMORROW WHICH CAN/T BE POSTPONED...TRY TO FINISH IT IN THE MORNING. ALSO...REGARDLESS OF WHEN TOMORROW YOU WORK OUTDOORS...WEAR LOOSE-FITTING...LIGHT COLORED CLOTHING. TAKE FREQUENT BREAKS IN THE SHADE. TRY TO DRINK PLENTY OF WATER OR OTHER NON-ALCOHOLIC BEVERAGES. DON/T WAIT UNTIL YOU FEEL THIRSTY. ALSO...KEEP AN EYE ON ELDERLY FRIENDS AND RELATIVES SINCE THEY ARE THE MOST SUSCEPTIBLE TO HEAT-INDUCED ILLNESSES. PETS ALSO SUFFER DURING THESE HOT SPELLS. MAKE SURE TO GIVE THEM AMPLE WATER AND ACCESS TO SHADE. DON/T LEAVE ANYONE...ANY PERSON OR ANY PET...IN A PARKED AUTOMOBILE FOR ANY LENGTH OF TIME. FURTHER STATEMENTS WILL BE ISSUED THROUGH TUESDAY BY THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ. FOR THE LATEST INFORMATION ON THIS HOT SPELL PLEASE STAY TUNED TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TV STATIONS...OR YOUR CABLE TV OUTLET. WEATHER INFORMATION MAY ALSO BE FOUND ON THE NWS MOUNT HOLLY INTERNET HOME PAGE AT WWW.NWS.NOAA.GOV/ER/PHI. MPD
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning in 1999
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.