Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 4, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Mar 28, 2021, 5:05 PM EDT for 4 counties in Maryland. It was in force for 40 min. 5 reports 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
- Mar 28, 2021, 5:05 PM EDT (21:05 UTC)
- Expired
- Mar 28, 2021, 5:45 PM EDT
- In force
- 40 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Baltimore County, MD, Carroll County, MD, Howard County, MD, Montgomery County, MD
The radar
The Sterling radar (KLWX), 63 km from the middle of the area, began a volume at 21:04 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 |
|---|---|---|---|
| Mar 28, 5:30 PM EDT | TSTM WND DMG | 2 Nnw Brookeville, MD | POWERLINES DOWN NEAR INTERSECTION OF GREGG RD AND GEORGIA AVE |
| Mar 28, 5:35 PM EDT | TSTM WND DMG | 2 N Historic Ellicott C, MD | TREE DOWN ON US-40 AT TYSON RD. |
| Mar 28, 5:37 PM EDT | TSTM WND DMG | 2 Nw Randallstown, MD | TWO TREES FELL ONTO THE ROOF OF A HOUSE NEAR THE INTERSECTION OF BRIDLE BROOK DRIVE AND BIRKENHEAD COURT. |
| Mar 28, 5:37 PM EDT | TSTM WND DMG | 3 Nnw Brooklandville, MD | TREE DOWN ON MD-25 FALLS ROAD NEAR DEEP RUN COURT. |
| Mar 28, 5:38 PM EDT | TSTM WND DMG | 2 Sw Historic Ellicott, MD | POWERLINES DOWN IN THE STREET AT 4600 BLOCK OF S LEISURE RD |
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 |
|---|---|---|---|
| Mar 28, 5:05 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 59 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
- 500 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 255 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
947
WUUS51 KLWX 282105
SVRLWX
MDC005-013-027-031-282145-
/O.NEW.KLWX.SV.W.0004.210328T2105Z-210328T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
505 PM EDT Sun Mar 28 2021
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
Carroll County in north central Maryland...
Howard County in central Maryland...
Montgomery County in central Maryland...
Western Baltimore County in northern Maryland...
* Until 545 PM EDT.
* At 504 PM EDT, severe thunderstorms with a history of producing
wind damage and measured wind gusts to near 60 mph were located
along a line extending from near Littlestown to near Boyds, moving
east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches
to fall. This could injure those outdoors, as well as
damage homes and vehicles. Roadways may become blocked by
downed trees. Localized power outages are possible.
Unsecured light objects may become projectiles.
* Locations impacted include...
Columbia, Germantown, Rockville, Gaithersburg, Olney, Pikesville,
Cockeysville, Westminster, Damascus, Lowes Island, Poolesville,
Historic Ellicott City, Ellicott City, Aspen Hill, Potomac, North
Bethesda, Catonsville, Woodlawn, Randallstown and Montgomery
Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms have a history of producing wind damage and measured
wind gusts to near 60 mph. For your protection move to an interior
room on the lowest floor of a building.
&&
LAT...LON 3956 7657 3941 7666 3937 7671 3927 7671
3912 7688 3913 7689 3912 7691 3906 7694
3906 7737 3907 7746 3927 7729 3936 7717
3949 7711 3954 7706 3972 7697 3972 7657
TIME...MOT...LOC 2104Z 273DEG 39KT 3971 7702 3924 7739
HAIL...<.75IN
WIND...60MPH
$$
DHOF3 follow-up statements
673
WWUS51 KLWX 282123
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
523 PM EDT Sun Mar 28 2021
MDC005-013-027-031-282145-
/O.CON.KLWX.SV.W.0004.000000T0000Z-210328T2145Z/
Carroll MD-Howard MD-Montgomery MD-Baltimore MD-
523 PM EDT Sun Mar 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CARROLL...HOWARD...CENTRAL MONTGOMERY AND WESTERN BALTIMORE
COUNTIES...
At 522 PM EDT, severe thunderstorms with a history of producing wind
damage and measured wind gusts to near 60 mph were located along a
line extending from near Manchester to near Sykesville to
Germantown, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated and observed wind.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Columbia, Germantown, Rockville, Gaithersburg, Olney, Pikesville,
Cockeysville, Westminster, Damascus, Historic Ellicott City, Ellicott
City, Aspen Hill, Potomac, North Bethesda, Catonsville, Woodlawn,
Randallstown, Montgomery Village, Owings Mills and Eldersburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms have a history of producing wind damage and measured
wind gusts to near 60 mph, despite producing very little lightning.
For your protection move to an interior room on the lowest floor of
a building.
&&
LAT...LON 3956 7657 3941 7666 3937 7671 3927 7671
3912 7688 3913 7689 3912 7691 3906 7694
3906 7732 3913 7736 3927 7729 3936 7717
3949 7711 3954 7706 3972 7697 3972 7657
TIME...MOT...LOC 2122Z 272DEG 41KT 3970 7679 3937 7702 3917 7727
HAIL...<.75IN
WIND...60MPH
$$
DHOF210
WWUS51 KLWX 282138
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
538 PM EDT Sun Mar 28 2021
MDC005-013-027-031-282145-
/O.CON.KLWX.SV.W.0004.000000T0000Z-210328T2145Z/
Carroll MD-Howard MD-Montgomery MD-Baltimore MD-
538 PM EDT Sun Mar 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN CARROLL...HOWARD...NORTHEASTERN MONTGOMERY AND
WESTERN BALTIMORE COUNTIES...
At 538 PM EDT, severe thunderstorms were located along a line
extending from near Stewartstown to Randallstown to Olney, moving
east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Columbia, Rockville, Gaithersburg, Olney, Pikesville, Cockeysville,
Historic Ellicott City, Ellicott City, Aspen Hill, Potomac, North
Bethesda, Catonsville, Woodlawn, Randallstown, Montgomery Village,
Owings Mills, Eldersburg, Milford Mill, Reisterstown and Lochearn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3956 7657 3941 7666 3937 7671 3927 7671
3912 7688 3913 7689 3912 7691 3906 7694
3906 7732 3915 7722 3927 7712 3936 7696
3947 7688 3953 7683 3972 7670 3972 7657
TIME...MOT...LOC 2138Z 270DEG 39KT 3969 7658 3936 7681 3916 7706
HAIL...<.75IN
WIND...60MPH
$$
DHOF402
WWUS51 KLWX 282154
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
554 PM EDT Sun Mar 28 2021
MDC005-013-027-031-282203-
/O.EXP.KLWX.SV.W.0004.000000T0000Z-210328T2145Z/
Carroll MD-Howard MD-Montgomery MD-Baltimore MD-
554 PM EDT Sun Mar 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARROLL...
HOWARD...NORTHEASTERN MONTGOMERY AND WESTERN BALTIMORE COUNTIES HAS
EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern, central and north central Maryland.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sterling Virginia.
LAT...LON 3956 7657 3941 7666 3937 7671 3927 7671
3912 7688 3913 7689 3912 7691 3906 7694
3906 7732 3915 7722 3927 7712 3936 7696
3947 7688 3953 7683 3972 7670 3972 7657
TIME...MOT...LOC 2153Z 270DEG 39KT 3968 7637 3935 7660 3915 7685
$$
DHOFThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 4:16 AM EDT | Wind Advisory | LWX | Allegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 6 more | 23 hr |
| Mar 28, 3:47 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 43 min |
| Mar 28, 4:23 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 52 min |
| Mar 28, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 45 min |
| Mar 28, 4:36 PM EDT | Tornado Warning | LWX | Carroll, Frederick | 24 min |
| Mar 28, 5:37 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 38 min |
| Mar 28, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 47 min |
| Mar 28, 7:05 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 55 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2021Every severe thunderstorm warning in 2021
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.