Alert archive / Maryland / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2011, 1:36 PM EST for Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Delaware. It was in force for 54 min. 1 report 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
- Feb 25, 2011, 1:36 PM EST (18:36 UTC)
- Expired
- Feb 25, 2011, 2:30 PM EST
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 61 km from the middle of the area, began a volume at 18:38 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 |
|---|---|---|---|
| Feb 25, 1:50 PM EST | TSTM WND GST 58 | Sandtown, DE |
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 |
|---|---|---|---|
| Feb 25, 12:19 PM EST | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.6 hours before the alert went out and 110 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
- 482 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 557 m²/s²
- 0-3 km storm-relative helicity
- 622 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
889
WUUS51 KPHI 251836
SVRPHI
DEC001-MDC011-035-041-251930-
/O.NEW.KPHI.SV.W.0004.110225T1836Z-110225T1930Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
136 PM EST FRI FEB 25 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
KENT COUNTY IN CENTRAL DELAWARE...
THIS INCLUDES THE CITY OF DOVER...
NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
NORTHERN TALBOT COUNTY IN EASTERN MARYLAND...
SOUTHERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF CENTERVILLE...
* UNTIL 230 PM EST
* AT 134 PM EST...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 7 MILES
SOUTHWEST OF CENTERVILLE...AND MOVING EAST AT 45 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
STARR...CARVILLE AND CENTERVILLE AROUND 140 PM EST...
JUMPTOWN...RIDGELY...QUEEN ANNE AND HOPE AROUND 145 PM EST...
OAKLAND AROUND 150 PM EST...
GOLDSBORO AND GREENSBORO AROUND 155 PM EST...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
&&
LAT...LON 3899 7620 3900 7618 3901 7619 3933 7547
3897 7535 3880 7625 3886 7627 3882 7620
3883 7620 3886 7622 3893 7621 3894 7624
3890 7623 3890 7625 3893 7629 3898 7630
TIME...MOT...LOC 1835Z 256DEG 46KT 3895 7609
$$
NIERENBERGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 25, 3:59 AM EST | Coastal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 10 hr |
| Feb 25, 12:44 PM EST | Special Weather Statement | PHI | Cecil | 61 min |
| Feb 25, 1:55 PM EST | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 65 min |
| Feb 25, 2:19 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 56 min |
| Feb 25, 7:53 AM EST | Special Weather Statement | PHI | Kent, Sussex | 82 min |
| Feb 25, 9:15 AM EST | Special Weather Statement | PHI | Kent, Sussex | 90 min |
| Feb 25, 10:28 AM EST | Special Weather Statement | PHI | Sussex | 62 min |
| Feb 25, 1:11 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 64 min |
| Feb 25, 2:57 PM EST | Special Weather Statement | PHI | Kent | 63 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2011Severe Thunderstorm Warnings in Delaware, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.