Alert archive / Maryland / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 110, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2015, 4:18 PM EDT for 4 counties in Maryland; Kent County, New Castle County, Delaware. It was in force for 57 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
- Aug 11, 2015, 4:18 PM EDT (20:18 UTC)
- Expired
- Aug 11, 2015, 5:15 PM EDT
- In force
- 57 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Kent 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 20:20 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.3 hours before the alert went out and 129 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
- 16 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 669 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
222
WUUS51 KPHI 112018
SVRPHI
DEC001-003-MDC011-029-035-041-112115-
/O.NEW.KPHI.SV.W.0110.150811T2018Z-150811T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
418 PM EDT TUE AUG 11 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
KENT COUNTY IN CENTRAL DELAWARE...
SOUTHWESTERN KENT COUNTY IN NORTHEASTERN MARYLAND...
QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
CAROLINE COUNTY IN EASTERN MARYLAND...
NORTHEASTERN TALBOT COUNTY IN EASTERN MARYLAND...
* UNTIL 515 PM EDT
* AT 417 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
MILLINGTON TO NEAR SUDLERSVILLE TO NEAR CENTREVILLE...AND MOVING
SOUTHEAST AT 20 MPH.
* LOCATIONS IMPACTED INCLUDE...
DOVER...CENTERVILLE...SMYRNA...DENTON...CENTREVILLE...CAMDEN...
CLAYTON...GREENSBORO...OAKLAND...RIDGELY...CHESWOLD...CHURCH
HILL...MILLINGTON...SUDLERSVILLE...GOLDSBORO...QUEEN ANNE...
WOODSIDE...VIOLA...HARTLY AND HARMONY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
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 3898 7620 3900 7617 3902 7619 3918 7598
3935 7584 3924 7540 3914 7541 3901 7552
3875 7585 3897 7623
TIME...MOT...LOC 2017Z 296DEG 16KT 3927 7582 3916 7591 3900 7611
$$2 follow-up statements
220
WWUS51 KPHI 112043
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
443 PM EDT TUE AUG 11 2015
DEC003-MDC029-112052-
/O.CAN.KPHI.SV.W.0110.000000T0000Z-150811T2115Z/
NEW CASTLE DE-KENT MD-
443 PM EDT TUE AUG 11 2015
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE AND
SOUTHWESTERN KENT COUNTIES IS CANCELLED...
THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3902 7608 3909 7599 3903 7589 3912 7579
3928 7565 3924 7540 3914 7541 3901 7552
3875 7585 3895 7618
TIME...MOT...LOC 2042Z 296DEG 16KT 3923 7570 3912 7579 3896 7599
$$
DEC001-MDC011-035-041-112115-
/O.CON.KPHI.SV.W.0110.000000T0000Z-150811T2115Z/
KENT DE-QUEEN ANNE'S MD-CAROLINE MD-TALBOT MD-
443 PM EDT TUE AUG 11 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHWESTERN KENT...SOUTHEASTERN QUEEN ANNE'S...CAROLINE AND
NORTHEASTERN TALBOT COUNTIES...
AT 442 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
HARTLY TO NEAR GOLDSBORO TO STARR...MOVING SOUTHEAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE...
DOVER...DENTON...CAMDEN...GREENSBORO...OAKLAND...RIDGELY...
CHESWOLD...GOLDSBORO...QUEEN ANNE...WOODSIDE...VIOLA...HARTLY...
STARR...HARMONY...HOPE...RISING SUN...CORDOVA...HAZLETTVILLE...DOVER
SPEEDWAY AND JUMPTOWN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
&&
LAT...LON 3902 7608 3909 7599 3903 7589 3912 7579
3928 7565 3924 7540 3914 7541 3901 7552
3875 7585 3895 7618
TIME...MOT...LOC 2042Z 296DEG 16KT 3923 7570 3912 7579 3896 7599
$$
PO039
WWUS51 KPHI 112114
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
514 PM EDT TUE AUG 11 2015
DEC001-MDC011-035-041-112123-
/O.EXP.KPHI.SV.W.0110.000000T0000Z-150811T2115Z/
KENT DE-QUEEN ANNE'S MD-CAROLINE MD-TALBOT MD-
514 PM EDT TUE AUG 11 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN KENT...
SOUTHEASTERN QUEEN ANNE'S...CAROLINE AND NORTHEASTERN TALBOT COUNTIES
WILL EXPIRE AT 515 PM EDT...
THE STORMS WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE. CLOUD TO
GROUND LIGHTNING IS STILL OCCURRING IN KENT COUNTY.
LAT...LON 3902 7608 3909 7599 3903 7589 3912 7579
3928 7565 3924 7540 3914 7541 3901 7552
3875 7585 3895 7618
TIME...MOT...LOC 2111Z 296DEG 16KT 3923 7570 3912 7579 3896 7599
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 2:54 PM EDT | Special Weather Statement | PHI | Cecil | 66 min |
| Aug 11, 3:30 PM EDT | Special Weather Statement | PHI | Caroline, Cecil, Kent, Queen Anne's | 60 min |
| Aug 11, 4:32 PM EDT | Special Weather Statement | PHI | Talbot | 88 min |
| Aug 11, 3:44 AM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Aug 11, 5:12 PM EDT | Special Weather Statement | PHI | Sussex | 93 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2015Severe Thunderstorm Warnings in Delaware, 2015Every severe thunderstorm warning in 2015
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.