Alert archive / Delaware / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 86, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 20, 2009, 5:46 PM EDT for Kent County, Sussex County, Delaware. It was in force for 59 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
- Jun 20, 2009, 5:46 PM EDT (21:46 UTC)
- Expired
- Jun 20, 2009, 6:45 PM EDT
- In force
- 59 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), 21 km from the middle of the area, began a volume at 21:48 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 |
|---|---|---|---|
| Jun 20, 3:05 PM EDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.8 hours before the alert went out and 120 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
- 1201 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 202146
SVRPHI
DEC001-005-202245-
/O.NEW.KPHI.SV.W.0086.090620T2146Z-090620T2245Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
546 PM EDT SAT JUN 20 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
KENT COUNTY IN CENTRAL DELAWARE...
THIS INCLUDES THE CITY OF DOVER...
NORTH CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 645 PM EDT
* AT 545 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 DOVER SPEEDWAY...OR NEAR
DOVER...AND MOVING SOUTHEAST AT 40 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
8 MILES NORTHEAST OF VIOLA AROUND 555 PM EDT...
BOWERS AROUND 600 PM EDT...
BIG STONE BEACH AND 8 MILES NORTHEAST OF MILFORD AROUND 610 PM
EDT...
SLAUGHTER BEACH AROUND 620 PM EDT...
9 MILES NORTHEAST OF MILTON AROUND 630 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
&&
LAT...LON 3866 7543 3912 7572 3929 7542 3924 7538
3920 7538 3916 7540 3907 7539 3903 7533
3898 7529 3893 7530 3889 7525 3883 7520
TIME...MOT...LOC 2146Z 320DEG 33KT 3916 7551
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 53 min |
| Jun 20, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 59 min |
| Jun 20, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 27 min |
| Jun 20, 6:55 PM EDT | Coastal Flood Advisory | PHI | Kent, New Castle, Sussex | 5 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 2009Every severe thunderstorm warning in 2009
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.