Alert archive / Maryland / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 79, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2017, 5:39 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 51 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
- Jul 1, 2017, 5:39 PM EDT (21:39 UTC)
- Expired
- Jul 1, 2017, 6:30 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 48 km from the middle of the area, began a volume at 21:39 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 1, 1:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.7 hours before the alert went out and 101 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
- 96 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
456
WUUS51 KPHI 012139
SVRPHI
DEC001-005-MDC011-035-041-012230-
/O.NEW.KPHI.SV.W.0079.170701T2139Z-170701T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
539 PM EDT SAT JUL 1 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
West central Sussex County in southern Delaware...
Southern Kent County in central Delaware...
Talbot County in eastern Maryland...
Southeastern Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
* Until 630 PM EDT
* At 538 PM EDT, severe thunderstorms were located along a line
extending from near Oakland to Oxford, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Easton, Denton, Harrington, Camden, Federalsburg, Greensboro,
Oakland, Ridgely, Trappe, Preston, Oxford, Bowers, Goldsboro, Queen
Anne, Woodside, Viola, Smithville, Rising Sun-Lebanon, Starr and
Jumptown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3863 7608 3864 7615 3868 7617 3869 7619
3867 7620 3871 7621 3871 7624 3913 7592
3909 7537 3864 7571 3869 7577 3868 7580
3871 7584 3870 7590 3866 7596 3860 7599
3857 7604
TIME...MOT...LOC 2138Z 303DEG 13KT 3904 7590 3867 7617
HAIL...0.75IN
WIND...60MPH
$$
SFJ2 follow-up statements
783
WWUS51 KPHI 012154
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
554 PM EDT SAT JUL 1 2017
DEC001-005-MDC011-035-041-012230-
/O.CON.KPHI.SV.W.0079.000000T0000Z-170701T2230Z/
Sussex DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-
554 PM EDT SAT JUL 1 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR WEST CENTRAL SUSSEX...SOUTHERN KENT...EASTERN TALBOT...
SOUTHEASTERN QUEEN ANNE'S AND CAROLINE COUNTIES...
At 553 PM EDT, severe thunderstorms were located along a line
extending from Greensboro to near Trappe, moving southeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Easton, Denton, Harrington, Camden, Federalsburg, Greensboro,
Oakland, Ridgely, Trappe, Preston, Bowers, Goldsboro, Queen Anne,
Woodside, Viola, Smithville, Jumptown, Agner, Choptank and Windyhill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3863 7608 3864 7615 3912 7586 3909 7537
3864 7571 3869 7577 3868 7580 3870 7580
3871 7584 3870 7590 3868 7594 3860 7599
3857 7604
TIME...MOT...LOC 2153Z 300DEG 17KT 3900 7581 3863 7608
HAIL...0.75IN
WIND...60MPH
$$
SFJ269
WWUS51 KPHI 012226
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
626 PM EDT SAT JUL 1 2017
DEC001-005-MDC011-035-041-012234-
/O.EXP.KPHI.SV.W.0079.000000T0000Z-170701T2230Z/
Sussex DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-
626 PM EDT SAT JUL 1 2017
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SUSSEX...SOUTHERN
KENT...EASTERN TALBOT...SOUTHEASTERN QUEEN ANNE'S AND CAROLINE
COUNTIES WILL EXPIRE AT 630 PM EDT...
The northern half of the line of 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 gusty winds are still possible with these
thunderstorms. Additionally, a severe thunderstorm warning remains
in effect for the southern portion of this line including portions
of Dorchester and Wicomico Counties in Maryland.
A severe thunderstorm watch remains in effect until 900 PM EDT for
central and southern Delaware...and eastern and northeastern
Maryland.
LAT...LON 3863 7608 3864 7615 3912 7586 3909 7537
3864 7571 3869 7577 3868 7580 3870 7580
3871 7584 3870 7590 3868 7594 3860 7599
3857 7604
TIME...MOT...LOC 2224Z 260DEG 27KT 3904 7553 3867 7580
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 44 min |
| Jul 1, 5:30 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Jul 1, 5:41 PM EDT | Special Weather Statement | PHI | Kent, New Castle | 34 min |
| Jul 1, 6:27 PM EDT | Special Weather Statement | PHI | Kent | 33 min |
| Jul 1, 4:12 PM EDT | Special Weather Statement | PHI | Cecil, Kent, Queen Anne's, Talbot | 33 min |
| Jul 1, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 67 min |
| Jul 1, 5:03 PM EDT | Special Weather Statement | PHI | Queen Anne's, Talbot | 27 min |
| Jul 1, 5:20 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 4 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2017Severe Thunderstorm Warnings in Delaware, 2017Every severe thunderstorm warning in 2017
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.