Alert archive / Delaware / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 56, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2009, 8:31 AM EDT for 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 9, 2009, 8:31 AM EDT (12:31 UTC)
- Expired
- Jun 9, 2009, 9:30 AM EDT
- In force
- 59 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 28 km from the middle of the area, began a volume at 12:33 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 nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.5 hours before the alert went out and 71 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
- 1362 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1059 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 091231
SVRPHI
DEC005-091330-
/O.NEW.KPHI.SV.W.0056.090609T1231Z-090609T1330Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
831 AM EDT TUE JUN 9 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 930 AM EDT
* AT 827 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 11
MILES SOUTH OF LAUREL...OR NEAR SALISBURY...AND MOVING NORTHEAST AT
25 MPH. OTHER SEVERE THUNDERSTORMS MAY FORM IN SUSSEX COUNTY
DURING THIS TIME.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
LAUREL AROUND 900 AM EDT...
8 MILES NORTHWEST OF GUMBORO AROUND 910 AM EDT...
SYCAMORE AROUND 920 AM EDT...
GEORGETOWN AND 7 MILES WEST OF MILLSBORO AROUND 930 AM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING. HEAVY RAINS WILL ALSO BE OCCURRING...DONT
DRIVE INTO FLOODED ROADS.
&&
LAT...LON 3845 7564 3847 7571 3864 7572 3883 7562
3862 7511 3860 7512 3861 7514 3858 7514
3845 7533
TIME...MOT...LOC 1229Z 219DEG 15KT 3841 7562
$$
JRPThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 8:20 AM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Jun 9, 9:09 AM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Jun 9, 1:49 PM EDT | Flash Flood Watch | PHI | New Castle | 5 hr |
| Jun 9, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 56 min |
| Jun 9, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 92 min |
| Jun 9, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 39 min |
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.