Alert archive / Maryland / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 1, 2017, 2:09 PM EST for Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland. It was in force for 51 min. 15 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
- Mar 1, 2017, 2:09 PM EST (19:09 UTC)
- Expired
- Mar 1, 2017, 3:00 PM EST
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 51 km from the middle of the area, began a volume at 19:12 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 |
|---|---|---|---|
| Mar 1, 2:17 PM EST | MARINE TSTM WIND 48 | 5 Ese Bay Ridge, MD | |
| Mar 1, 2:24 PM EST | TSTM WND GST 55 | Tolchester Beach, MD | |
| Mar 1, 2:30 PM EST | TSTM WND DMG | Church Hill, MD | NUMEROUS TREES REPORTED DOWN WITH A SHED ROOF DAMAGED. |
| Mar 1, 2:32 PM EST | MARINE TSTM WIND 44 | 15 Ese Galesville, MD | |
| Mar 1, 2:32 PM EST | TSTM WND DMG | Royal Oak, MD | TREE AND WIRES DOWN IN ROYAL OAK |
| Mar 1, 2:35 PM EST | TSTM WND DMG | Easton, MD | TREE DOWN IN EASTON |
| Mar 1, 2:38 PM EST | TSTM WND DMG | Barclay, MD | TRACTOR TRAILER TRUCK FLIPPED OVER ON ROUTE 313. SEVERAL SPEED LIMIT SIGNS BLOWN DOWN AS WELL. |
| Mar 1, 2:42 PM EST | TSTM WND DMG | Ridgely, MD | TREE DOWN IN RIDGELY |
| Mar 1, 2:44 PM EST | TSTM WND DMG | Greensboro, MD | TREE DOWN IN GREENSBORO |
| Mar 1, 2:45 PM EST | TSTM WND DMG | Denton, MD | TREE DOWN IN DENTON |
| Mar 1, 2:48 PM EST | TSTM WND DMG | Preston, MD | TREE DOWN IN PRESTON |
| Mar 1, 2:53 PM EST | TSTM WND DMG | Dover, DE | TREES REPORTED DOWN ON SEVERAL ROADWAYS IN DOVER. |
| Mar 1, 2:55 PM EST | TSTM WND DMG | 1 W Melvins Crossroads, DE | TWO STEEL BUILDINGS AND A HOME WERE DAMAGED FROM THUNDERSTORM WIND GUSTS. SEVERAL IRRIGATION PIVOTS OVERTURNED AND NUMEROUS LARGE TREES DOWNED. TIME ESTIMATED FROM RADAR. |
| Mar 1, 2:55 PM EST | TSTM WND DMG | Felton, DE | TREES DOWN ON A ROADWAY IN FELTON. |
| Mar 1, 2:57 PM EST | TSTM WND DMG | Harrington, DE | TREES DOWN ON ROADWAYS IN HARRINGTON. |
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 |
|---|---|---|---|
| Mar 1, 1:13 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.2 hours before the alert went out and 71 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 624 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
121
WUUS51 KPHI 011909
SVRPHI
DEC001-003-005-MDC011-029-035-041-012000-
/O.NEW.KPHI.SV.W.0018.170301T1909Z-170301T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
209 PM EST WED MAR 1 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Western Sussex County in southern Delaware...
Southwestern New Castle County in northern Delaware...
Kent County in central Delaware...
Talbot County in eastern Maryland...
Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
Kent County in northeastern Maryland...
* Until 300 PM EST
* At 208 PM EST, severe thunderstorms were located along a line
extending from near Millers Island to near Annapolis to near Deale
to near Prince Frederick to Sheridan Point to near Saint Clements
Bay, moving east at 65 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Locations impacted include...
Dover, Easton, Centerville, Talbot, Smyrna, Seaford, Chestertown,
Denton, Centreville, Laurel, Harrington, Camden, Clayton,
Federalsburg, Bridgeville, Greensboro, Oakland, Ridgely, Cheswold
and Rock Hall.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay
away from windows! This severe thunderstorm may contain little or no
lightning. Do not wait until you hear thunder before taking cover.
&&
LAT...LON 3846 7569 3869 7577 3868 7593 3857 7604
3876 7622 3877 7632 3867 7634 3896 7631
3884 7637 3892 7637 3904 7631 3901 7622
3917 7628 3932 7618 3938 7552 3879 7545
3845 7558
TIME...MOT...LOC 1908Z 279DEG 55KT 3920 7639 3894 7649 3877 7659 3858
7662 3845 7664 3829 7673
HAIL...1.00IN
WIND...70MPH
$$
333 follow-up statements
381
WWUS51 KPHI 011935
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
235 PM EST WED MAR 1 2017
DEC001-003-005-MDC011-029-035-041-012000-
/O.CON.KPHI.SV.W.0018.000000T0000Z-170301T2000Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
235 PM EST WED MAR 1 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EST
FOR WESTERN SUSSEX...SOUTHWESTERN NEW CASTLE...KENT...TALBOT...QUEEN
ANNE'S...CAROLINE AND NORTHEASTERN KENT COUNTIES...
At 234 PM EST, severe thunderstorms were located along a line
extending from near Massey to Wye Mills to near Oxford to 7 miles
northwest of Taylors Island, moving east at 60 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar and trained spotter indicated. This line of storms
has a history of producing damaging winds in northern
Virginia and central and southern Maryland.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Dover, Easton, Centerville, Talbot, Smyrna, Seaford, Chestertown,
Denton, Centreville, Laurel, Harrington, Camden, Clayton,
Federalsburg, Bridgeville, Greensboro, Oakland, Ridgely, Delmar and
Cheswold.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3846 7569 3864 7571 3869 7577 3868 7593
3857 7604 3877 7629 3878 7629 3869 7634
3882 7631 3886 7626 3879 7620 3879 7619
3891 7625 3891 7620 3895 7622 3933 7598
3938 7553 3878 7545 3846 7557 3845 7558
TIME...MOT...LOC 1934Z 256DEG 54KT 3931 7589 3893 7608 3870 7625 3857
7637
HAIL...<.75IN
WIND...70MPH
$$
JRK214
WWUS51 KPHI 011950
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
250 PM EST WED MAR 1 2017
MDC029-035-011959-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-170301T2000Z/
Queen Anne's MD-Kent MD-
250 PM EST WED MAR 1 2017
...THE SEVERE THUNDERSTORM WARNING FOR QUEEN ANNE'S AND NORTHEASTERN
KENT COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 700 PM EST for
central, northern and southern Delaware...and eastern Maryland.
LAT...LON 3847 7569 3864 7571 3869 7577 3871 7584
3870 7590 3866 7596 3857 7604 3859 7606
3861 7607 3907 7575 3936 7567 3938 7553
3877 7545 3871 7548 3846 7565
TIME...MOT...LOC 1949Z 269DEG 61KT 3932 7561 3894 7576 3868 7596 3859
7603
$$
DEC001-003-005-MDC011-041-012000-
/O.CON.KPHI.SV.W.0018.000000T0000Z-170301T2000Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Caroline MD-
250 PM EST WED MAR 1 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EST
FOR WESTERN SUSSEX...SOUTH CENTRAL NEW CASTLE...KENT...SOUTHEASTERN
TALBOT AND CAROLINE COUNTIES...
At 249 PM EST, severe thunderstorms were located along a line
extending from Smyrna to near Greensboro to Choptank to near
Cambridge, moving east at 70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar and trained spotter indicated. This line of storms
has a history of producing damaging winds in northern
Virginia and central and southern Maryland.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Dover, Smyrna, Seaford, Denton, Laurel, Harrington, Camden, Clayton,
Federalsburg, Bridgeville, Greensboro, Cheswold, Preston, Woodside,
Viola, Hartly, Smithville, Rising Sun-Lebanon, Hazlettville and
Agner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3847 7569 3864 7571 3869 7577 3871 7584
3870 7590 3866 7596 3857 7604 3859 7606
3861 7607 3907 7575 3936 7567 3938 7553
3877 7545 3871 7548 3846 7565
TIME...MOT...LOC 1949Z 269DEG 61KT 3932 7561 3894 7576 3868 7596 3859
7603
HAIL...<.75IN
WIND...60MPH
$$
JRK035
WWUS51 KPHI 012000
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
300 PM EST WED MAR 1 2017
DEC001-003-005-MDC011-041-012009-
/O.EXP.KPHI.SV.W.0018.000000T0000Z-170301T2000Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Caroline MD-
300 PM EST WED MAR 1 2017
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUSSEX...SOUTH CENTRAL
NEW CASTLE...KENT...SOUTHEASTERN TALBOT AND CAROLINE COUNTIES WILL
EXPIRE AT 300 PM EST...
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.
A Severe Thunderstorm Warning still remains in effect for
southeastern Caroline County in Maryland and Kent and Sussex
Counties in Delaware until 345 PM.
A severe thunderstorm watch remains in effect until 700 PM EST for
central, northern and southern Delaware...and eastern Maryland.
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 3847 7569 3864 7571 3869 7577 3871 7584
3870 7590 3866 7596 3857 7604 3859 7606
3861 7607 3907 7575 3936 7567 3938 7553
3877 7545 3871 7548 3846 7565
TIME...MOT...LOC 1959Z 279DEG 55KT 3930 7545 3892 7560 3866 7580 3857
7587
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 2:00 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 45 min |
| Mar 1, 2:45 PM EST | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 60 min |
| Mar 1, 3:09 PM EST | Wind Advisory | PHI | Kent, New Castle, Sussex | 19 hr |
| Mar 1, 2:46 PM EST | Special Weather Statement | PHI | Cecil | 29 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.