Alert archive / Delaware / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 137, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 18, 2019, 9:19 PM EDT for Sussex County, Delaware. It was in force for 41 min. 2 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
- Jun 18, 2019, 9:19 PM EDT (01:19 UTC)
- Expired
- Jun 18, 2019, 10:00 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 22 km from the middle of the area, began a volume at 01:19 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 |
|---|---|---|---|
| Jun 18, 9:44 PM EDT | MARINE TSTM WIND 42 | 2 Wnw Lewes, DE | WEATHERFLOW GAUGE. |
| Jun 18, 9:45 PM EDT | MARINE TSTM WIND 42 | 1 Wnw Lewes, DE | DEOS GAUGE. |
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 00:00Z, 1.3 hours before the alert went out and 89 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
- 957 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1229 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.8
The text
As transmitted.
338
WUUS51 KPHI 190119
SVRPHI
DEC005-190200-
/O.NEW.KPHI.SV.W.0137.190619T0119Z-190619T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
919 PM EDT Tue Jun 18 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Sussex County in southern Delaware...
* Until 1000 PM EDT.
* At 917 PM EDT, a severe thunderstorm was located near Bridgeville,
or 8 miles northwest of Georgetown, moving east at 35 mph. Radar
indicated the strongest winds are near the Bridgeville area and
moving eastward.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Georgetown, Millsboro, Lewes, Milton, Ellendale, Henlopen Acres,
Cape Henlopen State Park, Long Neck, Greenwood and Dewey Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to damaging winds, frequent cloud to ground lightning is
occurring with this storm. Move indoors immediately. Remember, if
you can hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 3870 7554 3882 7563 3892 7531 3880 7518
3878 7512 3880 7510 3880 7509 3865 7506
3864 7508 3869 7508 3869 7514 3864 7513
3863 7511 3856 7533
TIME...MOT...LOC 0117Z 251DEG 33KT 3875 7553
HAIL...<.75IN
WIND...60MPH
$$
Gorse2 follow-up statements
672
WWUS51 KPHI 190135
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
935 PM EDT Tue Jun 18 2019
DEC005-190200-
/O.CON.KPHI.SV.W.0137.000000T0000Z-190619T0200Z/
Sussex DE-
935 PM EDT Tue Jun 18 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR NORTHEASTERN SUSSEX COUNTY...
At 935 PM EDT, a severe thunderstorm was located near Milton, or 11
miles northeast of Georgetown, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Lewes, Milton, Ellendale, Henlopen Acres, Cape Henlopen State Park,
Long Neck and Dewey Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 3873 7538 3886 7551 3892 7531 3880 7518
3878 7512 3880 7510 3880 7509 3865 7506
3864 7508 3869 7508 3869 7514 3864 7513
3863 7511 3861 7518
TIME...MOT...LOC 0135Z 251DEG 39KT 3882 7526
HAIL...<.75IN
WIND...60MPH
$$
Gorse118
WWUS51 KPHI 190151
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
951 PM EDT Tue Jun 18 2019
DEC005-190201-
/O.EXP.KPHI.SV.W.0137.000000T0000Z-190619T0200Z/
Sussex DE-
951 PM EDT Tue Jun 18 2019
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 1000 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and is exiting the warned area. Therefore, the warning will
be allowed to expire. However heavy rain is still possible for a
little while longer with this thunderstorm.
LAT...LON 3873 7538 3886 7551 3892 7531 3880 7518
3878 7512 3880 7510 3880 7509 3865 7506
3864 7508 3869 7508 3869 7514 3864 7513
3863 7511 3861 7518
TIME...MOT...LOC 0151Z 251DEG 33KT 3886 7510
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 8:39 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 51 min |
| Jun 18, 9:09 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 2 hr |
| Jun 19, 3:17 AM EDT | Flash Flood Watch | PHI | New Castle | 43 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 2019Every severe thunderstorm warning in 2019
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.