Alert archive / Delaware / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 260, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2011, 1:42 PM EDT for Sussex County, Delaware. It was in force for 63 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
- Aug 19, 2011, 1:42 PM EDT (17:42 UTC)
- Expired
- Aug 19, 2011, 2:45 PM EDT
- In force
- 63 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 17:43 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 |
|---|---|---|---|
| Aug 19, 1:45 PM EDT | HAIL 0.25 | Laurel, DE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.7 hours before the alert went out and 71 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
- 766 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 1132 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
055 WUUS51 KPHI 191742 SVRPHI DEC005-191845- /O.NEW.KPHI.SV.W.0260.110819T1742Z-110819T1845Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 142 PM EDT FRI AUG 19 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE... THIS INCLUDES THE CITY OF GEORGETOWN... * UNTIL 245 PM EDT * AT 137 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 LAUREL...OR 12 MILES SOUTHWEST OF GEORGETOWN...AND MOVING EAST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... SYCAMORE AROUND 210 PM EDT... 7 MILES WEST OF MILLSBORO...8 MILES NORTH OF GUMBORO AND 8 MILES SOUTH OF GEORGETOWN AROUND 245 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...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 3846 7569 3865 7563 3878 7529 3847 7525 TIME...MOT...LOC 1742Z 261DEG 6KT 3857 7554 $$ TFG
1 follow-up statement
301 WWUS51 KPHI 191810 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 210 PM EDT FRI AUG 19 2011 DEC005-191845- /O.CON.KPHI.SV.W.0260.000000T0000Z-110819T1845Z/ SUSSEX DE- 210 PM EDT FRI AUG 19 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR WESTERN SUSSEX COUNTY... AT 208 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES SOUTH OF BETHEL...OR 9 MILES NORTH OF SALISBURY...MOVING EAST AT 5 MPH. EXTREMELY HEAVY RAIN IS ALSO FALLING WITH THIS STORM. THE SEVERE THUNDERSTORM WILL BE NEAR... BETHEL BY 225 PM EDT... LAUREL AND 8 MILES SOUTHWEST OF SYCAMORE BY 245 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. && LAT...LON 3846 7569 3865 7563 3878 7529 3847 7525 TIME...MOT...LOC 1810Z 261DEG 6KT 3849 7564 $$ 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, 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, 4:09 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 66 min |
| 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 |
Nearby
Severe 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.