Alert archive / Delaware / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly

May 3, 2025New Castle County, Delaware; Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 3, 2025, 6:16 PM EDT for New Castle County, Delaware; Chester County, Pennsylvania. It was in force for 44 min. 1 report 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: May 3, 2025, 6:16 PM EDT (22:16 UTC)
Expired: May 3, 2025, 7:00 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties New Castle County, DE, Chester County, PA

The radar

The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 22:19 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
May 3, 6:42 PM EDT	HAIL 0.7	London Britain Twp, PA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 3, 5:51 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 169 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 77 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

650 
WUUS51 KPHI 032216
SVRPHI
DEC003-PAC029-032300-
/O.NEW.KPHI.SV.W.0028.250503T2216Z-250503T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
616 PM EDT Sat May 3 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern New Castle County in northern Delaware...
  South central Chester County in southeastern Pennsylvania...

* Until 700 PM EDT.

* At 615 PM EDT, a severe thunderstorm was located over Bay View, or
  7 miles northeast of Havre De Grace, moving northeast at 25 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Wind 
           damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Newport, Greenville, Stanton, West Grove, North Star, Landenberg,
  Delaware Memorial Bridge, Kennett Square, Wilmington Manor,
  Toughkenamon, Brookside, Elsmere, Pike Creek, Avondale,
  Kemblesville, Newark, Hockessin, Ashland, Wilmington, and New
  Castle.

This includes Interstate 95 in Delaware between mile markers 0 and
15.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3996 7573 3970 7550 3969 7551 3962 7576
      3962 7579 3972 7579 3972 7606
TIME...MOT...LOC 2215Z 240DEG 22KT 3963 7601 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hoeflich

2 follow-up statements

812 
WWUS51 KPHI 032231
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
631 PM EDT Sat May 3 2025

DEC003-PAC029-032300-
/O.CON.KPHI.SV.W.0028.000000T0000Z-250503T2300Z/
New Castle DE-Chester PA-
631 PM EDT Sat May 3 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHWESTERN NEW CASTLE AND SOUTH CENTRAL CHESTER COUNTIES...

At 631 PM EDT, a severe thunderstorm was located over Blake, or 7
miles west of Newark, moving northeast at 25 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Greenville, West Grove, North Star, Landenberg, Kennett Square,
Toughkenamon, Pike Creek, Avondale, Kemblesville, Newark, Hockessin,
Ashland, Elsmere, Oxford, and Wilmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3972 7603 3973 7604 3996 7573 3976 7555
      3966 7579 3972 7579
TIME...MOT...LOC 2231Z 233DEG 23KT 3970 7590 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hoeflich

130 
WWUS51 KPHI 032258
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
658 PM EDT Sat May 3 2025

DEC003-PAC029-032308-
/O.EXP.KPHI.SV.W.0028.000000T0000Z-250503T2300Z/
New Castle DE-Chester PA-
658 PM EDT Sat May 3 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE AND
SOUTH CENTRAL CHESTER COUNTIES WILL EXPIRE AT 700 PM EDT...

The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Delaware...and southeastern Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3972 7603 3973 7604 3996 7573 3976 7555
      3966 7579 3972 7579
TIME...MOT...LOC 2258Z 240DEG 22KT 4023 7424 

$$

Hoeflich

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 7:32 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
May 3, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	52 min
May 3, 7:34 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	41 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2025 Severe Thunderstorm Warnings in Pennsylvania, 2025 Every severe thunderstorm warning in 2025

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.