Alert archive / Delaware / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 243, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 15, 2011, 3:18 PM EDT for Kent County, Sussex County, Delaware. It was in force for 57 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 15, 2011, 3:18 PM EDT (19:18 UTC)
- Expired
- Aug 15, 2011, 4:15 PM EDT
- In force
- 57 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE
The radar
The Dover AFB radar (KDOX), 9 km from the middle of the area, began a volume at 19:17 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.3 hours before the alert went out and 92 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
- 460 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 689 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
643
WUUS51 KPHI 151918
SVRPHI
DEC001-005-152015-
/O.NEW.KPHI.SV.W.0243.110815T1918Z-110815T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
318 PM EDT MON AUG 15 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
NORTHERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 415 PM EDT
* AT 311 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR HARRINGTON...OR 15 MILES
SOUTH OF DOVER...AND MOVING SOUTHEAST AT 25 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
MILFORD AROUND 330 PM EDT...
ELLENDALE AROUND 340 PM EDT...
7 MILES SOUTHWEST OF SLAUGHTER BEACH AROUND 345 PM EDT...
MILTON AND 8 MILES NORTHEAST OF GEORGETOWN AROUND 355 PM EDT...
LEWES AROUND 410 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO DAMAGING WINDS...HEAVY RAIN WILL OCCUR WITH THESE
STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3893 7574 3894 7573 3908 7554 3898 7529
3893 7530 3889 7525 3886 7523 3881 7518
3879 7513 3879 7511 3880 7509 3857 7534
TIME...MOT...LOC 1917Z 307DEG 22KT 3893 7556
$$
HEAVENER2 follow-up statements
857
WWUS51 KPHI 151943
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
343 PM EDT MON AUG 15 2011
DEC001-005-152015-
/O.CON.KPHI.SV.W.0243.000000T0000Z-110815T2015Z/
KENT DE-SUSSEX DE-
343 PM EDT MON AUG 15 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTH CENTRAL SUSSEX AND SOUTHEASTERN KENT COUNTIES...
AT 340 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR ELLENDALE...OR 11
MILES NORTH OF GEORGETOWN...MOVING SOUTHEAST AT 25 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
MILTON BY 355 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3873 7539 3894 7562 3900 7545 3898 7529
3893 7530 3889 7525 3886 7523 3882 7519
TIME...MOT...LOC 1943Z 307DEG 22KT 3883 7540
$$
HEAVENER745
WWUS51 KPHI 152006
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
406 PM EDT MON AUG 15 2011
DEC001-005-152016-
/O.EXP.KPHI.SV.W.0243.000000T0000Z-110815T2015Z/
KENT DE-SUSSEX DE-
406 PM EDT MON AUG 15 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SUSSEX AND
SOUTHEASTERN KENT COUNTIES WILL EXPIRE AT 415 PM EDT...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3873 7539 3894 7562 3900 7545 3898 7529
3893 7530 3889 7525 3886 7523 3882 7519
TIME...MOT...LOC 2006Z 307DEG 22KT 3874 7526
$$
HEAVENERThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:56 AM EDT | Special Weather Statement | PHI | New Castle | 64 min |
| Aug 15, 10:58 AM EDT | Special Weather Statement | PHI | Kent | 62 min |
| Aug 15, 1:05 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Aug 15, 1:38 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 4 hr |
| Aug 15, 2:47 PM EDT | Special Weather Statement | PHI | Kent | 58 min |
| Aug 15, 3:25 PM EDT | Special Weather Statement | PHI | Kent, Sussex | 3 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 2011Every severe thunderstorm warning in 2011
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.