Alert archive / Delaware / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 159, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2024, 4:11 PM EDT for New Castle County, Delaware; Salem County, New Jersey. It was in force for 34 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 31, 2024, 4:11 PM EDT (20:11 UTC)
- Expired
- Jul 31, 2024, 4:45 PM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 20:12 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 4:13 PM EDT | TSTM WND GST 46 | 1 S Saint Georges, DE | DEDOT gauge at the Chesapeake and Delaware Canal Bridge. |
| Jul 31, 4:15 PM EDT | TSTM WND DMG | 2 Nw Port Penn, DE | Reports of tree damage with debris blocking portions of Dutch Neck Road and Thorntown Road northwest of Port Penn. Power outages also reported in the area. Time estimated. |
| Jul 31, 4:17 PM EDT | TSTM WND GST 43 | 1 Se Mcdonough, DE | Wunderground station KDEMIDDL71 measured gust. |
| Jul 31, 4:25 PM EDT | TSTM WND GST 48 | Lower Alloways Creek, NJ | NJWxNet at Lower Alloways Creek. |
| Jul 31, 4:25 PM EDT | MARINE TSTM WIND 48 | Lower Alloways Creek, NJ | NJWxNet at Lower Alloways Creek. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.2 hours before the alert went out and 173 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
- 1093 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 704 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
993
WUUS51 KPHI 312011
SVRPHI
DEC003-NJC033-312045-
/O.NEW.KPHI.SV.W.0159.240731T2011Z-240731T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
411 PM EDT Wed Jul 31 2024
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern New Castle County in northern Delaware...
Southwestern Salem County in southern New Jersey...
* Until 445 PM EDT.
* At 411 PM EDT, a severe thunderstorm was located over Saint
Georges, or 7 miles northeast of Middletown, moving southeast at 30
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Salem, Alloway, Quinton, Delaware City, Hancocks Bridge, Saint
Georges, Port Penn, Hope Creek, Mount Pleasant, and Odessa.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3962 7563 3955 7528 3946 7539 3945 7541
3944 7541 3936 7551 3936 7553 3950 7573
TIME...MOT...LOC 2011Z 293DEG 24KT 3953 7563
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
PO2 follow-up statements
080
WWUS51 KPHI 312023
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
423 PM EDT Wed Jul 31 2024
DEC003-NJC033-312045-
/O.CON.KPHI.SV.W.0159.000000T0000Z-240731T2045Z/
New Castle DE-Salem NJ-
423 PM EDT Wed Jul 31 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTH CENTRAL NEW CASTLE AND SOUTHWESTERN SALEM COUNTIES...
At 423 PM EDT, a severe thunderstorm was located over Hope Creek, or
9 miles east of Middletown, moving southeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Salem, Alloway, Quinton, Delaware City, Hancocks Bridge, Port Penn,
Hope Creek, and Odessa.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3959 7557 3955 7528 3946 7539 3946 7541
3944 7542 3936 7551 3936 7553 3947 7569
TIME...MOT...LOC 2023Z 293DEG 23KT 3950 7554
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
PO768
WWUS51 KPHI 312042
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
442 PM EDT Wed Jul 31 2024
DEC003-NJC033-312052-
/O.EXP.KPHI.SV.W.0159.000000T0000Z-240731T2045Z/
New Castle DE-Salem NJ-
442 PM EDT Wed Jul 31 2024
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE AND
SOUTHWESTERN SALEM COUNTIES WILL EXPIRE AT 445 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 3959 7557 3955 7528 3946 7539 3946 7541
3944 7542 3936 7551 3936 7553 3947 7569
TIME...MOT...LOC 2042Z 293DEG 24KT 3945 7539
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:56 AM EDT | Heat Advisory | PHI | Kent, New Castle, Sussex | 64 hr |
| Jul 31, 4:09 PM EDT | Special Marine Warning | PHI | 36 min | |
| Jul 31, 5:25 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jul 31, 5:59 PM EDT | Special Marine Warning | PHI | 91 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2024Severe Thunderstorm Warnings in New Jersey, 2024Every severe thunderstorm warning in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.