Alert archive / Delaware / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 215, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2011, 3:58 PM EDT for Kent County, New Castle County, Delaware; Kent County, Queen Anne's County, Maryland. It was in force for 36 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
- Jul 31, 2011, 3:58 PM EDT (19:58 UTC)
- Expired
- Jul 31, 2011, 4:34 PM EDT
- In force
- 36 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE, Kent County, MD, Queen Anne's County, MD
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 4:00 PM EDT | TSTM WND DMG | Clayton, DE | POLES DOWN IN CLAYTON... BLOCKED ROADWAY. |
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, 8.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2108 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
055 WUUS51 KPHI 311958 SVRPHI DEC001-003-MDC029-035-312100- /O.NEW.KPHI.SV.W.0215.110731T1958Z-110731T2100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 358 PM EDT SUN JUL 31 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN KENT COUNTY IN CENTRAL DELAWARE... EXTREME EAST CENTRAL KENT COUNTY IN NORTHEAST MARYLAND... NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND... EXTREME SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE... * UNTIL 500 PM EDT * AT 352 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR DELANEY CORNER...OR 12 MILES NORTHWEST OF DOVER...AND MOVING EAST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GREEN SPRING AROUND 405 PM EDT... CLAYTON AROUND 415 PM EDT... CLAYTON AROUND 420 PM EDT... SMYRNA AROUND 430 PM EDT... CHESWOLD AROUND 500 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. THE HEAVY RAIN WILL ALSO LOOSEN THE ROOTS OF WEAKER TREES AND KNOCK THEM DOWN. 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 3919 7582 3931 7584 3933 7558 3918 7553 TIME...MOT...LOC 1958Z 290DEG 6KT 3925 7570 $$ TFG
2 follow-up statements
632 WWUS51 KPHI 312015 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 415 PM EDT SUN JUL 31 2011 DEC003-MDC029-035-312024- /O.CAN.KPHI.SV.W.0215.000000T0000Z-110731T2100Z/ KENT MD-QUEEN ANNE'S MD-NEW CASTLE DE- 415 PM EDT SUN JUL 31 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHWESTERN NEW CASTLE...NORTHEASTERN QUEEN ANNE'S AND EXTREME EAST CENTRAL KENT COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM IS NOW IN KENT COUNTY DELAWARE. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 3919 7573 3928 7572 3930 7557 3918 7553 TIME...MOT...LOC 2014Z 290DEG 6KT 3924 7567 $$ DEC001-312100- /O.CON.KPHI.SV.W.0215.000000T0000Z-110731T2100Z/ KENT DE- 415 PM EDT SUN JUL 31 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR NORTHWESTERN KENT COUNTY... AT 409 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR KENTON...OR 10 MILES NORTHWEST OF DOVER...MOVING EAST AT 5 MPH. FLASH FLOODING IS LIKELY ALSO OCCURRING WITH THIS STORM. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CLAYTON...SMYRNA AND CHESWOLD 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 3919 7573 3928 7572 3930 7557 3918 7553 TIME...MOT...LOC 2014Z 290DEG 6KT 3924 7567 $$ TFG
247 WWUS51 KPHI 312034 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 434 PM EDT SUN JUL 31 2011 DEC001-312044- /O.CAN.KPHI.SV.W.0215.000000T0000Z-110731T2100Z/ KENT DE- 434 PM EDT SUN JUL 31 2011 ...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL KENT COUNTY IS CANCELLED... THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS. HEAVY RAIN THOUGH CONTINUES TO FALL AND A FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN KENT COUNTY. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 3919 7573 3928 7572 3930 7557 3918 7553 TIME...MOT...LOC 2034Z 290DEG 6KT 3923 7563 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:09 PM EDT | Special Weather Statement | PHI | Kent | 66 min |
| Jul 31, 2:35 PM EDT | Areal Flood Advisory | PHI | Kent | 115 min |
| Jul 31, 2:45 PM EDT | Special Weather Statement | PHI | Kent | 90 min |
| Jul 31, 3:33 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 2 hr |
| Jul 31, 4:36 PM EDT | Special Weather Statement | PHI | Kent | 84 min |
| Jul 31, 4:56 PM EDT | Special Weather Statement | PHI | Sussex | 64 min |
| Jul 31, 12:30 PM EDT | Special Weather Statement | PHI | Caroline | 60 min |
| Jul 31, 1:23 PM EDT | Special Weather Statement | PHI | Caroline | 82 min |
| Jul 31, 2:39 PM EDT | Special Weather Statement | PHI | Talbot | 96 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2011Severe Thunderstorm Warnings in Maryland, 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.