Alert archive / Maryland / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 47, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 18, 2011, 3:22 PM EDT for Kent County, Queen Anne's County, Talbot County, Maryland. It was in force for 47 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
- May 18, 2011, 3:22 PM EDT (19:22 UTC)
- Expired
- May 18, 2011, 4:09 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 19:21 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 |
|---|---|---|---|
| May 18, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.4 hours before the alert went out and 48 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
- 79 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 561 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
416
WUUS51 KPHI 181922
SVRPHI
MDC029-035-041-182030-
/O.NEW.KPHI.SV.W.0047.110518T1922Z-110518T2030Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
322 PM EDT WED MAY 18 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL TALBOT COUNTY IN EASTERN MARYLAND...
WESTERN KENT COUNTY IN NORTHEAST MARYLAND...
WESTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF CENTERVILLE...
* UNTIL 430 PM EDT
* AT 317 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR WYE MILLS...OR 9 MILES
NORTHWEST OF EASTON...AND MOVING NORTH AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
WYE MILLS AROUND 330 PM EDT...
GRASONVILLE AROUND 335 PM EDT...
OVERTON AROUND 355 PM EDT...
OLD TOWN AROUND 415 PM EDT...
ROCK HALL AROUND 420 PM EDT...
LANGFORD AROUND 425 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.
&&
LAT...LON 3903 7633 3905 7629 3901 7629 3898 7621
3900 7618 3903 7625 3907 7623 3918 7628
3934 7617 3937 7612 3937 7599 3886 7607
3885 7622 3893 7621 3894 7624 3890 7624
3893 7629 3902 7633
TIME...MOT...LOC 1922Z 172DEG 15KT 3891 7615
$$
GORSE2 follow-up statements
803
WWUS51 KPHI 181943
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
343 PM EDT WED MAY 18 2011
MDC041-181953-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-110518T2030Z/
TALBOT MD-
343 PM EDT WED MAY 18 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL TALBOT COUNTY IS
CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE
AREA, THEREFORE THE WARNING HAS BEEN CANCELLED.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.
LAT...LON 3895 7606 3896 7620 3902 7633 3903 7633
3905 7629 3901 7629 3898 7621 3900 7618
3903 7625 3907 7623 3918 7628 3934 7617
3937 7612 3937 7599
TIME...MOT...LOC 1943Z 179DEG 23KT 3907 7615
$$
MDC029-035-182030-
/O.CON.KPHI.SV.W.0047.000000T0000Z-110518T2030Z/
KENT MD-QUEEN ANNE'S MD-
343 PM EDT WED MAY 18 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR WESTERN QUEEN ANNE'S AND WESTERN KENT COUNTIES...
AT 340 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING TO
60 MPH. THIS STORM WAS LOCATED NEAR OVERTON...OR NEAR
CENTERVILLE...MOVING NORTH AT 25 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
OLD TOWN AND ROCK HALL BY 355 PM EDT...
LANGFORD BY 400 PM EDT...
CHESTERTOWN AND KINGSTOWN BY 405 PM EDT...
NEWTOWN BY 420 PM EDT...
BETTERTON BY 430 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO CLOUD TO GROUND
LIGHTNING. DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK SHELTER
IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.
&&
LAT...LON 3895 7606 3896 7620 3902 7633 3903 7633
3905 7629 3901 7629 3898 7621 3900 7618
3903 7625 3907 7623 3918 7628 3934 7617
3937 7612 3937 7599
TIME...MOT...LOC 1943Z 179DEG 23KT 3907 7615
$$
GORSE347
WWUS51 KPHI 182009
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
409 PM EDT WED MAY 18 2011
MDC029-035-182018-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-110518T2030Z/
KENT MD-QUEEN ANNE'S MD-
409 PM EDT WED MAY 18 2011
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN QUEEN ANNE'S AND
WESTERN KENT COUNTIES IS CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS, THEREFORE THE WARNING HAS BEEN CANCELLED. HOWEVER, DOWNPOURS
WILL OCCUR WITH THIS STORM ALONG WITH THE POTENTIAL FOR LOCALLY
GUSTY WINDS UP TO 40 MPH.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.
LAT...LON 3895 7606 3896 7620 3902 7633 3903 7633
3905 7629 3901 7629 3898 7621 3900 7618
3903 7625 3907 7623 3918 7628 3934 7617
3937 7612 3937 7599
TIME...MOT...LOC 2008Z 179DEG 23KT 3923 7615
$$
GORSEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 2:29 PM EDT | Special Weather Statement | PHI | Talbot | 61 min |
| May 18, 2:39 PM EDT | Tornado Warning | PHI | Queen Anne's, Talbot | 51 min |
| May 18, 4:01 PM EDT | Coastal Flood Statement | PHI | Kent, Queen Anne's, Talbot | 5 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2011Every severe thunderstorm warning in 2011
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.