Alert archive / Delaware / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 136, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 1997, 2:40 PM EDT for Sussex County, Delaware. It was in force for 65 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
- Sep 1, 1997, 2:40 PM EDT (18:40 UTC)
- Expired
- Sep 1, 1997, 3:45 PM EDT
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Sussex County, DE
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.7 hours before the alert went out and 84 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
- 1218 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 641 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 011837 RRA SVRPHL DEC005-DEZ501-NJZ501-011945- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 240 PM EDT MON SEP 1 1997 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 345 PM EDT AND A FLASH FLOOD WARNING EFFECTIVE UNTIL 345 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN DELAWARE ...SOUTHERN SUSSEX COUNTY AT 237 PM EDT...A SEVERE THUNDERSTORM WAS INDICATED BY NWS DOPPLER RADAR 5 MILES SOUTHWEST OF GEORGETOWN MOVING EAST SOUTHEAST AT 15 MPH. THIS STORM MAY AFFECT THE FOLLOWING NEARBY AREAS... MILLSBORO... DAGSBORO. THIS IS A DANGEROUS STORM. TO AVOID STRONG THUNDERSTORM WINDS... 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. BE ALSO ALERT FOR FLOODING. IF YOU ARE IN AN AREA PRONE TO FLOODING...MOVE TO HIGHER GROUND IMMEDIATELY...BEFORE YOUR ACCESS IS CUT OFF BY RISING FLOOD WATERS. DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS. THE WATER MAY BE DEEPER THAN YOU THINK. THIS STORM WILL PRODUCE OVER TWO INCHES OF RAIN WITHIN ONE HOUR. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION OUTLET. JONES/GIGI
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 1, 11:07 AM EDT, 3 hours 33 minutes before
PAZ054-055-060>062-067>071-NJZ001-007>010-012>026- DEZALL-MDZ008-012-015-019-020-020000- THUNDERSTORM AND HEAVY RAINFALL POTENTIAL STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1107 AM EDT MON SEP 1 1997 ...SCATTERED SHOWERS AND THUNDERSTORMS POSSIBLE THROUGH THIS HOLIDAY EVENING - BRINGING DOWNPOURS TO A FEW LOCATIONS... THE SHOWERS THAT MUCH OF THE AREA RECEIVED LAST NIGHT HAVE MOVED OFF THE COAST AND DISSIPATED. THERE IS STILL PLENTY OF MOISTURE LEFT BEHIND...AND COMBINED WITH WEAK WINDS THROUGHOUT THE ATMOSPHERE... WILL RESULT IN THE POTENTIAL FOR HEAVY DOWNPOURS WITH ANY SLOW-MOVING THUNDERSTORM THAT DEVELOPS THIS AFTERNOON OR EVENING. BETWEEN ONE AND TWO INCHES OF RAIN COULD FALL IN JUST ONE HOURS TIME WITH ANY THUNDERSTORM. HEAVY RAIN APPEARS TO BE THE MAIN CONCERN THIS AFTERNOON AND EVENING...WITH THE THREAT OF DAMAGING WINDS AND LARGE HAIL MINIMAL. STAY TUNED TO NOAA RADIO...THE VOICE OF THE NATIONAL WEATHER SERVICE...OR YOUR LOCAL RADIO...TELEVISION OR CABLE TELEVISION STATION FOR ANY FURTHER INFORMATION. ADDITIONAL WEATHER INFORMATION CAN ALSO BE FOUND ON OUR INTERNET HOME PAGE...AT www.nws.noaa.gov/er/phi JONES/NATIONAL WEATHER SERVICE
Special weather statement, Sep 1, 11:08 AM EDT, 3 hours 32 minutes before
PAZ054-055-060>062-067>071-NJZ001-007>010-012>026- DEZALL-MDZ008-012-015-019-020-020000- THUNDERSTORM AND HEAVY RAINFALL POTENTIAL STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1107 AM EDT MON SEP 1 1997 ...SCATTERED SHOWERS AND THUNDERSTORMS POSSIBLE THROUGH THIS HOLIDAY EVENING - BRINGING DOWNPOURS TO A FEW LOCATIONS... THE SHOWERS THAT MUCH OF THE AREA RECEIVED LAST NIGHT HAVE MOVED OFF THE COAST AND DISSIPATED. THERE IS STILL PLENTY OF MOISTURE LEFT BEHIND...AND COMBINED WITH WEAK WINDS THROUGHOUT THE ATMOSPHERE... WILL RESULT IN THE POTENTIAL FOR HEAVY DOWNPOURS WITH ANY SLOW-MOVING THUNDERSTORM THAT DEVELOPS THIS AFTERNOON OR EVENING. BETWEEN ONE AND TWO INCHES OF RAIN COULD FALL IN JUST ONE HOURS TIME WITH ANY THUNDERSTORM. HEAVY RAIN APPEARS TO BE THE MAIN CONCERN THIS AFTERNOON AND EVENING...WITH THE THREAT OF DAMAGING WINDS AND LARGE HAIL MINIMAL. STAY TUNED TO NOAA RADIO...THE VOICE OF THE NATIONAL WEATHER SERVICE...OR YOUR LOCAL RADIO...TELEVISION OR CABLE TELEVISION STATION FOR ANY FURTHER INFORMATION. ADDITIONAL WEATHER INFORMATION CAN ALSO BE FOUND ON OUR INTERNET HOME PAGE...AT www.nws.noaa.gov/er/phi JONES/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 1, 2:40 PM EDT | Flash Flood Warning | PHI | Sussex | 65 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 1997Every severe thunderstorm warning in 1997
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.