Alert archive / Maryland / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2009, 4:45 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Sussex County, Delaware. It was in force for 50 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, 4:45 PM EDT (20:45 UTC)
- Expired
- May 29, 2009, 5:35 PM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 56 km from the middle of the area, began a volume at 20:47 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, 5:25 PM EDT | HAIL 1 | Houston, DE | QUARTER SIZE HAIL NEAR MILFORD |
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, 8.8 hours before the alert went out and 70 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 292045
SVRPHI
DEC001-005-MDC011-035-041-292145-
/O.NEW.KPHI.SV.W.0037.090529T2045Z-090529T2145Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
445 PM EDT FRI MAY 29 2009
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...
CAROLINE COUNTY IN EASTERN MARYLAND...
TALBOT COUNTY IN EASTERN MARYLAND...
THIS INCLUDES THE CITY OF EASTON...
EASTERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF CENTERVILLE...
NORTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 545 PM EDT
* AT 443 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 SUDLERSVILLE TO TILGHMAN
ISLAND...OR ALONG A LINE EXTENDING FROM 15 MILES NORTHEAST OF
CENTERVILLE TO 14 MILES WEST OF EASTON...AND MOVING EAST AT 25 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
STARR...COPPERVILLE...ST. MICHAELS...SKIPTON...HARTLY...OAKLAND...
JUMPTOWN...QUEEN ANNE...CORDOVA...GOLDSBORO...RIDGELY...
HAZLETTVILLE...CHESWOLD...GREENSBORO...SANDTOWN...HAMBLETON...
GRIFFIN...DOVER SPEEDWAY...MATTHEWS...CAMDEN...WOODSIDE...DENTON...
TANYARD...RISING SUN...VIOLA...PRESTON...HARMONY...SMITHVILLE...
AGNER...ANDREWSVILLE...HARRINGTON AND BOWERS
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 3869 7624 3873 7625 3870 7627 3872 7631
3869 7635 3874 7635 3876 7640 3877 7640
3875 7635 3887 7626 3882 7621 3893 7621
3921 7584 3927 7540 3909 7540 3903 7533
3869 7578
TIME...MOT...LOC 2045Z 270DEG 21KT 3915 7580 3875 7632
$$
MPD2 follow-up statements
000
WWUS51 KPHI 292115
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
515 PM EDT FRI MAY 29 2009
MDC035-292125-
/O.CAN.KPHI.SV.W.0037.000000T0000Z-090529T2145Z/
QUEEN ANNES MD-
515 PM EDT FRI MAY 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN QUEEN ANNES COUNTY IS
CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
LAT...LON 3869 7624 3873 7625 3870 7627 3872 7631
3869 7635 3874 7635 3877 7640 3875 7635
3887 7626 3884 7625 3882 7621 3893 7602
3892 7595 3900 7593 3912 7576 3927 7540
3909 7540 3903 7533 3869 7578
TIME...MOT...LOC 2115Z 271DEG 23KT 3910 7541 3873 7613
$$
DEC001-005-MDC011-041-292145-
/O.CON.KPHI.SV.W.0037.000000T0000Z-090529T2145Z/
KENT DE-CAROLINE MD-SUSSEX DE-TALBOT MD-
515 PM EDT FRI MAY 29 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR TALBOT...NORTHWESTERN SUSSEX...CAROLINE AND KENT COUNTIES...
AT 515 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 BOWERS TO HAMBLETON...OR
ALONG A LINE EXTENDING FROM 7 MILES SOUTHEAST OF DOVER TO EASTON...
MOVING EAST AT 25 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DENTON...MATTHEWS...FELTON...RIVERVIEW...TANYARD...FREDERICA...
HARMONY...HARRINGTON...PRESTON...ANDREWSVILLE...SMITHVILLE...AGNER...
HOUSTON AND FARMINGTON
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 3869 7624 3873 7625 3870 7627 3872 7631
3869 7635 3874 7635 3877 7640 3875 7635
3887 7626 3884 7625 3882 7621 3893 7602
3892 7595 3900 7593 3912 7576 3927 7540
3909 7540 3903 7533 3869 7578
TIME...MOT...LOC 2115Z 271DEG 23KT 3910 7541 3873 7613
$$
MPD000
WWUS51 KPHI 292135
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
535 PM EDT FRI MAY 29 2009
DEC001-005-MDC011-041-292144-
/O.CAN.KPHI.SV.W.0037.000000T0000Z-090529T2145Z/
KENT DE-CAROLINE MD-SUSSEX DE-TALBOT MD-
535 PM EDT FRI MAY 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR TALBOT...NORTHWESTERN
SUSSEX...NORTHWEST AND CENTRAL CAROLINE AND KENT COUNTIES IS
CANCELLED...
STORMS HAVE MOVED TO THE EAST. A SEVERE THUNDERSTORM WATCH REMAINS
IN EFFECT UNTIL 800 PM EDT FRIDAY EVENING FOR DELAWARE AND
NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.
LAT...LON 3869 7624 3873 7625 3870 7627 3872 7631
3869 7635 3874 7635 3877 7640 3875 7635
3887 7626 3884 7625 3882 7621 3893 7602
3892 7595 3900 7593 3912 7576 3927 7540
3909 7540 3903 7533 3869 7578
TIME...MOT...LOC 2134Z 271DEG 23KT 3910 7525 3873 7597
$$
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, 5:32 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 58 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2009Severe Thunderstorm Warnings in Delaware, 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.