Alert archive / Maryland / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 266, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2011, 4:09 PM EDT for Kent County, Delaware; Caroline County, Queen Anne's County, Maryland. It was in force for 66 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 19, 2011, 4:09 PM EDT (20:09 UTC)
- Expired
- Aug 19, 2011, 5:15 PM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 43 km from the middle of the area, began a volume at 20:11 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.2 hours before the alert went out and 49 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
- 146 J/kg
- Mixed-layer CIN
- -154 J/kg
- Mixed-layer LCL
- 1250 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 359 m²/s²
- 0-3 km storm-relative helicity
- 370 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
935 WUUS51 KPHI 192009 SVRPHI DEC001-MDC011-035-192115- /O.NEW.KPHI.SV.W.0266.110819T2009Z-110819T2115Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 409 PM EDT FRI AUG 19 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN KENT COUNTY IN CENTRAL DELAWARE... NORTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND... NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND... * UNTIL 515 PM EDT * AT 407 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SANDTOWN...OR 15 MILES SOUTHWEST OF DOVER...AND MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 6 MILES WEST OF HAZLETTVILLE AROUND 420 PM EDT... HARTLY AROUND 435 PM EDT... SUDLERSVILLE AROUND 445 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. && LAT...LON 3920 7598 3928 7557 3899 7555 3891 7576 TIME...MOT...LOC 2010Z 167DEG 17KT 3905 7574 $$ TFG
1 follow-up statement
377 WWUS51 KPHI 192105 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 505 PM EDT FRI AUG 19 2011 MDC035-192115- /O.CAN.KPHI.SV.W.0266.000000T0000Z-110819T2115Z/ QUEEN ANNE'S MD- 505 PM EDT FRI AUG 19 2011 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNE'S COUNTY IS CANCELLED... THE STORM IS SOUTH OF THE COUNTY. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN PENNSYLVANIA. LAT...LON 3906 7586 3918 7556 3899 7555 3891 7576 TIME...MOT...LOC 2105Z 215DEG 21KT 3901 7580 $$ DEC001-MDC011-192115- /O.CON.KPHI.SV.W.0266.000000T0000Z-110819T2115Z/ KENT DE-CAROLINE MD- 505 PM EDT FRI AUG 19 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR NORTHEASTERN CAROLINE AND CENTRAL KENT COUNTIES... AT 502 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR GREENSBORO...OR 14 MILES EAST OF CENTERVILLE...MOVING NORTHEAST AT 25 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... GOLDSBORO BY 510 PM EDT... HENDERSON...SANDTOWN AND 7 MILES SOUTHWEST OF HAZLETTVILLE BY 515 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 3906 7586 3918 7556 3899 7555 3891 7576 TIME...MOT...LOC 2105Z 215DEG 21KT 3901 7580 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:26 PM EDT | Areal Flood Advisory | PHI | New Castle | 112 min |
| Aug 19, 12:50 AM EDT | Special Weather Statement | PHI | New Castle | 40 min |
| Aug 19, 1:14 AM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 19, 1:44 AM EDT | Special Weather Statement | PHI | New Castle | 61 min |
| Aug 19, 3:06 AM EDT | Areal Flood Advisory | PHI | Kent | 114 min |
| Aug 19, 4:00 AM EDT | Areal Flood Warning | PHI | New Castle | 4 hr |
| Aug 19, 1:20 PM EDT | Special Weather Statement | PHI | Kent, Sussex | 85 min |
| Aug 19, 1:42 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 63 min |
| Aug 19, 2:09 PM EDT | Areal Flood Advisory | PHI | Sussex | 92 min |
| Aug 19, 2:33 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 7 hr |
| Aug 19, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 52 min |
| Aug 19, 2:59 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 61 min |
| Aug 19, 3:13 PM EDT | Special Weather Statement | PHI | Sussex | 92 min |
| Aug 19, 3:53 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 5 hr |
| Aug 19, 4:23 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 82 min |
| Aug 19, 4:42 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Aug 19, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 63 min |
| Aug 19, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 65 min |
| Aug 19, 6:34 PM EDT | Areal Flood Advisory | PHI | Sussex | 2 hr |
| Aug 18, 8:35 PM EDT | Special Weather Statement | PHI | Queen Anne's | 55 min |
| Aug 19, 12:02 AM EDT | Special Weather Statement | PHI | Cecil | 58 min |
| Aug 19, 1:00 AM EDT | Special Weather Statement | PHI | Cecil | 45 min |
| Aug 19, 4:53 PM EDT | Areal Flood Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's | 5 hr |
| Aug 19, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 55 min |
| Aug 19, 5:39 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 19, 6:18 PM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
| Aug 19, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 69 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.