Alert archive / Delaware / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 39, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2009, 5:32 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 58 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
- May 29, 2009, 5:32 PM EDT (21:32 UTC)
- Expired
- May 29, 2009, 6:30 PM EDT
- In force
- 58 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 2 km from the middle of the area, began a volume at 21:33 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 |
|---|---|---|---|
| May 29, 5:40 PM EDT | HAIL 1 | Nne Milford Mill, DE | IN ADDITION TO LARGE HAIL, SMALL TREE BRANCHES BLOWN DOWN. |
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 |
|---|---|---|---|
| May 29, 1:26 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.5 hours before the alert went out and 93 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
- 4 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 292132
SVRPHI
DEC001-005-MDC011-292230-
/O.NEW.KPHI.SV.W.0039.090529T2132Z-090529T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
532 PM EDT FRI MAY 29 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN KENT COUNTY IN CENTRAL DELAWARE...
SOUTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...
SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 630 PM EDT
* AT 529 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM BOWERS TO GEORGETOWN TO 11
MILES SOUTHWEST OF FEDERALSBURG...OR ALONG A LINE EXTENDING FROM 9
MILES SOUTHEAST OF DOVER TO GEORGETOWN TO 16 MILES SOUTHEAST OF
EASTON...AND MOVING EAST AT 25 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BIG
STONE BEACH...SLAUGHTER BEACH...MILTON...LEWES...SYCAMORE...
LAUREL...REHOBOTH BEACH...GUMBORO...SELBYVILLE...MILLSBORO...
FENWICK ISLAND AND BETHANY BEACH
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
&&
LAT...LON 3846 7570 3865 7572 3869 7583 3869 7587
3876 7577 3927 7543 3926 7539 3924 7538
3909 7540 3898 7529 3893 7530 3880 7516
3880 7507 3847 7503 3844 7505
TIME...MOT...LOC 2132Z 270DEG 20KT 3906 7538 3870 7543
3858 7589
$$
MPD1 follow-up statement
000
WWUS51 KPHI 292200
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
600 PM EDT FRI MAY 29 2009
DEC001-MDC011-292210-
/O.CAN.KPHI.SV.W.0039.000000T0000Z-090529T2230Z/
KENT DE-CAROLINE MD-
600 PM EDT FRI MAY 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CAROLINE AND
EASTERN KENT COUNTIES IS CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
LAT...LON 3846 7570 3875 7570 3877 7562 3882 7554
3888 7551 3891 7547 3892 7541 3895 7539
3894 7530 3893 7530 3880 7516 3880 7507
3847 7503 3844 7505
TIME...MOT...LOC 2200Z 270DEG 20KT 3906 7518 3870 7523
3858 7569
$$
DEC005-292230-
/O.CON.KPHI.SV.W.0039.000000T0000Z-090529T2230Z/
SUSSEX DE-
600 PM EDT FRI MAY 29 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SUSSEX COUNTY...
AT 558 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 12 MILES NORTHEAST OF
SLAUGHTER BEACH TO 7 MILES SOUTHEAST OF MILTON TO BETHEL...OR ALONG A
LINE EXTENDING FROM 18 MILES NORTHWEST OF CAPE MAY TO 8 MILES EAST OF
GEORGETOWN TO 16 MILES NORTHWEST OF SALISBURY...MOVING EAST AT 25
MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LEWES...LAUREL...HENLOPEN ACRES...SYCAMORE...REHOBOTH BEACH...DEWEY
BEACH...GUMBORO...SOUTH BETHANY...SELBYVILLE...OCEAN VIEW...
MILLVILLE...MILLSBORO...LONG NECK...FRANKFORD...FENWICK ISLAND...
DAGSBORO AND BETHANY BEACH
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
&&
LAT...LON 3846 7570 3875 7570 3877 7562 3882 7554
3888 7551 3891 7547 3892 7541 3895 7539
3894 7530 3893 7530 3880 7516 3880 7507
3847 7503 3844 7505
TIME...MOT...LOC 2200Z 270DEG 20KT 3906 7518 3870 7523
3858 7569
$$
MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 3:22 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 68 min |
| May 29, 4:45 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 50 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2009Severe Thunderstorm Warnings in Maryland, 2009Every severe thunderstorm warning in 2009
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.