Alert archive / Maryland / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 362, NWS Philadelphia/Mount Holly

September 13, 2023Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 13, 2023, 12:49 AM EDT for Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 26 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: Sep 13, 2023, 12:49 AM EDT (04:49 UTC)
Expired: Sep 13, 2023, 1:15 AM EDT
In force: 26 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 04:52 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
Sep 13, 1:15 AM EDT	TSTM WND GST 42	1 S Odessa, DE	DEDOT site US 1 at Appoquinimink River.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 4.8 hours before the alert went out and 148 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: 738 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

684 
WUUS51 KPHI 130449
SVRPHI
DEC001-003-MDC029-035-130515-
/O.NEW.KPHI.SV.W.0362.230913T0449Z-230913T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1249 AM EDT Wed Sep 13 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Northwestern Kent County in central Delaware...
  Northeastern Queen Anne's County in northeastern Maryland...
  Northeastern Kent County in northeastern Maryland...

* Until 115 AM EDT.

* At 1249 AM EDT, severe thunderstorms were located along a line
  extending from near Hollywood Beach to Cecilton to near Millington,
  moving northeast at 45 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...
  Newark, Middletown, Smyrna, Clayton, Delaware City, Millington,
  Sudlersville, Glasgow, Bear, Port Penn, Delaney Corner, Pike Creek,
  Crumpton, Saint Georges, Sassafras, Mount Pleasant, Green Spring,
  Massey, North Star and Hockessin.

This includes Interstate 95 in Delaware between mile markers 1 and 8.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3936 7588 3938 7582 3938 7577 3972 7579
      3978 7569 3957 7555 3928 7554 3910 7593
      3934 7595 3937 7597
TIME...MOT...LOC 0449Z 232DEG 39KT 3953 7595 3940 7587 3923 7586 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MPS

1 follow-up statement

401 
WWUS51 KPHI 130508
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
108 AM EDT Wed Sep 13 2023

DEC001-003-MDC029-035-130517-
/O.EXP.KPHI.SV.W.0362.000000T0000Z-230913T0515Z/
New Castle DE-Kent DE-Queen Anne's MD-Kent MD-
108 AM EDT Wed Sep 13 2023

...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...NORTHWESTERN
KENT...NORTHEASTERN QUEEN ANNE'S AND NORTHEASTERN KENT COUNTIES WILL
EXPIRE AT 115 AM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However, heavy 
rain is still possible with these thunderstorms.

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 3936 7588 3938 7582 3938 7577 3972 7579
      3978 7569 3957 7555 3928 7554 3910 7593
      3934 7595 3937 7597
TIME...MOT...LOC 0507Z 232DEG 39KT 3965 7575 3952 7567 3935 7566 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 13, 12:01 AM EDT	Special Weather Statement	PHI	Queen Anne's	29 min
Sep 13, 12:08 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	52 min
Sep 13, 12:25 AM EDT	Tornado Warning	PHI	Queen Anne's, Talbot	35 min
Sep 13, 1:06 AM EDT	Special Weather Statement	PHI	Caroline	24 min
Sep 13, 1:45 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	45 min
Sep 13, 1:54 AM EDT	Special Weather Statement	PHI	Caroline	36 min
Sep 13, 1:15 AM EDT	Special Weather Statement	PHI	New Castle	30 min
Sep 13, 2:12 AM EDT	Flash Flood Warning	PHI	Kent	3 hr
Sep 13, 2:21 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	25 min
Sep 13, 2:34 AM EDT	Special Weather Statement	PHI	Kent	26 min
Sep 13, 2:58 AM EDT	Special Weather Statement	PHI	Sussex	32 min
Sep 13, 3:37 AM EDT	Special Weather Statement	PHI	Sussex	23 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2023 Severe Thunderstorm Warnings in Delaware, 2023 Every severe thunderstorm warning in 2023

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.