Alert archive / Maryland / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 160, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2009, 3:10 PM EDT for Cecil County, Kent County, Maryland. It was in force for 65 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, 2009, 3:10 PM EDT (19:10 UTC)
- Expired
- Jul 31, 2009, 4:15 PM EDT
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Cecil County, MD, Kent County, MD
The radar
The Dover AFB radar (KDOX), 74 km from the middle of the area, began a volume at 19:10 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 |
|---|---|---|---|
| Jul 31, 4:00 PM EDT | TSTM WND DMG | Chestertown, MD | TREES AND WIRES REPORTED DOWN IN CHESTERTOWN AND ROCK HALL. |
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 |
|---|---|---|---|
| Jul 31, 1:18 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 127 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
- 276 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 888 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 311910
SVRPHI
MDC015-029-312015-
/O.NEW.KPHI.SV.W.0160.090731T1910Z-090731T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
310 PM EDT FRI JUL 31 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
KENT COUNTY IN NORTHEAST MARYLAND...
* UNTIL 415 PM EDT
* AT 307 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 13 MILES SOUTHWEST OF NEWTOWN...
OR 15 MILES SOUTHEAST OF BALTIMORE...AND MOVING EAST AT 30 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
NEWTOWN AROUND 335 PM EDT...
CHESTERTOWN AROUND 340 PM EDT...
7 MILES SOUTH OF BETTERTON AROUND 345 PM EDT...
MORGNEC AND KENNEDYVILLE AROUND 350 PM EDT...
MASSEY AND 8 MILES SOUTH OF CECILTON AROUND 410 PM EDT...
SASSAFRAS AROUND 415 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM SHOWS SIGNS OF ROTATION ON RADAR AND COULD PRODUCE A
SMALL TORNADO.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.
&&
LAT...LON 3934 7617 3934 7615 3938 7611 3938 7600
3940 7605 3946 7600 3953 7579 3926 7578
3925 7582 3927 7586 3925 7591 3925 7598
3921 7604 3918 7627
TIME...MOT...LOC 1909Z 258DEG 24KT 3921 7635
$$
AMC1 follow-up statement
000
WWUS51 KPHI 311935
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
335 PM EDT FRI JUL 31 2009
MDC015-029-312015-
/O.CON.KPHI.SV.W.0160.000000T0000Z-090731T2015Z/
CECIL MD-KENT MD-
335 PM EDT FRI JUL 31 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN KENT AND SOUTHEASTERN CECIL COUNTIES...
AT 331 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BETTERTON...OR 23
MILES SOUTHWEST OF MIDDLETOWN...MOVING EAST AT 30 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
KENNEDYVILLE BY 340 PM EDT...
GALENA BY 355 PM EDT...
CECILTON BY 400 PM EDT...
SASSAFRAS AND 7 MILES SOUTH OF CAYOTS BY 405 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM CONTINUES TO SHOW SIGNS OF ROTATION ON RADAR AND COULD
PRODUCE A FUNNEL CLOUD OR A SMALL TORNADO.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.
&&
LAT...LON 3927 7606 3933 7616 3938 7611 3938 7600
3940 7605 3946 7600 3953 7579 3933 7578
TIME...MOT...LOC 1934Z 249DEG 27KT 3931 7608
$$
AMCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:04 PM EDT | Flash Flood Warning | PHI | Cecil | 3 hr |
| Jul 31, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 65 min |
| Jul 31, 3:54 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 53 min |
| Jul 31, 4:08 PM EDT | Flash Flood Warning | PHI | Cecil | 3 hr |
Nearby
Severe 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.