Alert archive / Delaware / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 19, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 7, 2009, 1:33 PM EDT for Kent County, New Castle County, Delaware. It was in force for 66 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
- May 7, 2009, 1:33 PM EDT (17:33 UTC)
- Expired
- May 7, 2009, 2:39 PM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE
The radar
The Dover AFB radar (KDOX), 63 km from the middle of the area, began a volume at 17:35 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, 5.6 hours before the alert went out and 46 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
- 38 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 106 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 071733
SVRPHI
DEC001-003-071900-
/O.NEW.KPHI.SV.W.0019.090507T1733Z-090507T1900Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
133 PM EDT THU MAY 7 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN KENT COUNTY IN CENTRAL DELAWARE...
SOUTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
THIS INCLUDES THE CITY OF MIDDLETOWN...
* UNTIL 300 PM EDT
* AT 132 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 8 MILES
NORTHWEST OF DELANEY CORNER...OR 9 MILES SOUTHWEST OF MIDDLETOWN...
AND MOVING NORTHEAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
9 MILES NORTHWEST OF GREEN SPRING BY 145 PM EDT...
MIDDLETOWN AND MOUNT PLEASANT BY 150 PM EDT...
SAINT GEORGES BY 200 PM EDT...
PORT PENN AND DELAWARE CITY BY 205 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS 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.
&&
LAT...LON 3912 7575 3950 7578 3960 7560 3959 7559
3961 7557 3960 7555 3954 7555 3946 7558
3942 7552 3935 7548 3932 7543 3924 7538
3922 7539 3909 7574
TIME...MOT...LOC 1733Z 241DEG 31KT 3938 7586
$$
TFG2 follow-up statements
000
WWUS51 KPHI 071824
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
224 PM EDT THU MAY 7 2009
DEC001-003-071900-
/O.CON.KPHI.SV.W.0019.000000T0000Z-090507T1900Z/
KENT DE-NEW CASTLE DE-
224 PM EDT THU MAY 7 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR SOUTH CENTRAL NEW CASTLE AND NORTHERN KENT COUNTIES...
AT 222 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM LIKELY OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS
LOCATED NEAR SMYRNA...OR 12 MILES SOUTHEAST OF MIDDLETOWN...MOVING
NORTHEAST AT 30 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
WOODLAND BEACH BY 235 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 3916 7568 3934 7571 3943 7553 3942 7552
3935 7548 3932 7543 3926 7539
TIME...MOT...LOC 1824Z 245DEG 27KT 3933 7557
$$
TFG000
WWUS51 KPHI 071839
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
239 PM EDT THU MAY 7 2009
DEC001-003-071849-
/O.CAN.KPHI.SV.W.0019.000000T0000Z-090507T1900Z/
KENT DE-NEW CASTLE DE-
239 PM EDT THU MAY 7 2009
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE AND
NORTHERN KENT COUNTIES IS CANCELLED...
THE SEVERE STORM HAS CROSSED THE DELAWARE RIVER INTO NEW JERSEY.
LAT...LON 3916 7568 3934 7571 3943 7553 3942 7552
3935 7548 3932 7543 3926 7539
TIME...MOT...LOC 1839Z 245DEG 27KT 3938 7543
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 9:01 PM EDT | Flood Watch | PHI | New Castle | 19 hr |
| May 7, 1:51 AM EDT | Flash Flood Warning | PHI | New Castle | 5 hr |
| May 7, 2:00 AM EDT | River Flood Warning | PHI | New Castle | 3 hr |
| May 7, 1:22 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 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.