Alert archive / Delaware / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 191, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 16, 2007, 11:31 PM EDT for Sussex County, Delaware. It was in force for 25 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 16, 2007, 11:31 PM EDT (03:31 UTC)
- Expired
- Aug 16, 2007, 11:56 PM EDT
- In force
- 25 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 03:33 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 16, 11:07 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.5 hours before the alert went out and 85 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
- 4766 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 4.7
- Supercell composite
- 26.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 170332
SVRPHI
DEC005-170415-
/O.NEW.KPHI.SV.W.0191.070817T0331Z-070817T0415Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1131 PM EDT THU AUG 16 2007
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 1215 AM EDT
* AT 1123 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
REHOBOTH BEACH...OR ABOUT 39 MILES SOUTHEAST OF DOVER...AND
MOVING EAST AT 25 MPH. OTHER STRONG WINDS WERE INDICATED JUST
SOUTHEAST OF GEORGETOWN.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HENLOPEN ACRES AND DEWEY BEACH
THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM EDT FRIDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND.
LAT...LON 3858 7516 3859 7516 3860 7516 3858 7518
3861 7544 3881 7540 3881 7517 3879 7514
3879 7511 3881 7508 3866 7505 3866 7506
3859 7504 3857 7505
TIME...MOT...LOC 0331Z 269DEG 24KT 3869 7503
$$
JRP1 follow-up statement
000
WWUS51 KPHI 170356
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1154 PM EDT THU AUG 16 2007
DEC005-170404-
/O.CAN.KPHI.SV.W.0191.000000T0000Z-070817T0415Z/
SUSSEX DE-
1154 PM EDT THU AUG 16 2007
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY IS
CANCELLED...
THUNDERSTORMS HAVE WEAKENED OVER EAST-CENTRAL SUSSEX COUNTY. ANOTHER
STRONG THUNDERSTORM WAS OVER FAR NORTHWESTERN PORTIONS OF SUSSEX
COUNTY HOWEVER...AND THIS WILL BE MONITORED. HEAVY RAIN, BRIEF GUSTY
WINDS, AND FREQUENT LIGHTNING ARE POSSIBLE WITH THIS CELL AS IT
MOVES TO THE EAST AT 20 MILES AN HOUR...REACHING GREENWOOD BETWEEN
1210 AND 1220 AM.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM EDT FRIDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND.
LAT...LON 3858 7516 3859 7516 3860 7516 3858 7518
3861 7544 3881 7540 3881 7517 3879 7514
3879 7511 3881 7508 3866 7505 3866 7506
3859 7504 3857 7505
TIME...MOT...LOC 0354Z 269DEG 24KT 3869 7483
$$
JRPThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 10:16 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 44 min |
| Aug 16, 10:20 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 55 min |
| Aug 16, 10:54 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 36 min |
| Aug 17, 12:26 AM EDT | Severe Thunderstorm Warning | PHI | Sussex | 22 min |
| Aug 17, 2:36 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 54 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2007Every severe thunderstorm warning in 2007
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.