Alert archive / Maryland / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 107, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2015, 5:37 AM EDT for Kent County, New Castle County, Delaware; Cecil County, Kent County, Queen Anne's County, Maryland. It was in force for 34 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 4, 2015, 5:37 AM EDT (09:37 UTC)
- Expired
- Aug 4, 2015, 6:11 AM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 09:39 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 9.6 hours before the alert went out and 148 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
- 627 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 1863 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
810
WUUS51 KPHI 040937
SVRPHI
DEC001-003-MDC015-029-035-041030-
/O.NEW.KPHI.SV.W.0107.150804T0937Z-150804T1030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
537 AM EDT TUE AUG 4 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
NORTHERN KENT COUNTY IN CENTRAL DELAWARE...
NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
NORTHERN KENT COUNTY IN NORTHEASTERN MARYLAND...
CECIL COUNTY IN NORTHEASTERN MARYLAND...
* UNTIL 630 AM EDT
* AT 536 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED OVER MIDDLE RIVER...AND MOVING
EAST AT 50 MPH.
* LOCATIONS IMPACTED INCLUDE...
DOVER...MIDDLETOWN...SMYRNA...CHESTERTOWN...CLAYTON...DELAWARE
CITY...CHESWOLD...CECILTON...MILLINGTON...SUDLERSVILLE...
BETTERTON...HARTLY...CAYOTS...KENNEDYVILLE...BOHEMIAS MILLS...
DELANEY CORNER...PORT PENN...WARWICK...HOLLYWOOD BEACH AND MASSEY.
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.
IN ADDITION TO LARGE HAIL AND 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.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3926 7622 3929 7617 3932 7618 3942 7600
3952 7598 3954 7599 3960 7564 3959 7557
3959 7558 3951 7556 3946 7559 3935 7549
3933 7550 3934 7549 3931 7543 3925 7540
3917 7541 3917 7627
TIME...MOT...LOC 0936Z 261DEG 44KT 3928 7634
$$
HEAVENER1 follow-up statement
860
WWUS51 KPHI 041011
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
611 AM EDT TUE AUG 4 2015
DEC001-003-MDC015-029-035-041019-
/O.CAN.KPHI.SV.W.0107.000000T0000Z-150804T1030Z/
NEW CASTLE DE-KENT DE-QUEEN ANNE'S MD-KENT MD-CECIL MD-
611 AM EDT TUE AUG 4 2015
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE...
NORTHERN KENT...NORTHEASTERN QUEEN ANNE'S...NORTHERN KENT AND CECIL
COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS
WEAKENED. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3926 7622 3929 7617 3932 7618 3942 7600
3952 7598 3954 7599 3960 7564 3959 7557
3959 7558 3951 7556 3946 7559 3935 7549
3933 7550 3934 7549 3931 7543 3925 7540
3917 7541 3917 7627
TIME...MOT...LOC 1008Z 261DEG 44KT 3934 7582
$$
HEAVENERThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 4:20 AM EDT | Severe Thunderstorm Warning | PHI | New Castle | 33 min |
| Aug 4, 6:11 PM EDT | Special Weather Statement | PHI | Sussex | 64 min |
| Aug 4, 6:20 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 20 min |
| Aug 4, 5:18 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 57 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.