Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 2, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Mar 28, 2021, 4:23 PM EDT for Carroll County, Frederick County, Washington County, Maryland. It was in force for 52 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, 4:23 PM EDT (20:23 UTC)
- Expired
- Mar 28, 2021, 5:15 PM EDT
- In force
- 52 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Carroll County, MD, Frederick County, MD, Washington County, MD
The radar
The Sterling radar (KLWX), 68 km from the middle of the area, began a volume at 20:25 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, 4:25 PM EDT | TSTM WND DMG | 3 Ese Smithsburg, MD | TREE AND WIRES DOWN NEAR INTERSECTION OF WHITEHALL ROAD AND OSWALD LANE. |
| Mar 28, 4:31 PM EDT | TSTM WND DMG | Wolfsville, MD | WIRES AND POLE DOWN NEAR INTERSECTION OF WOLFSVILLE ROAD AND HARP HILL ROAD. |
| Mar 28, 4:36 PM EDT | TSTM WND DMG | 3 Sse Sabillasville, MD | WIRES AND POLE DOWN ON EYLERS VALLEY FLINT ROAD AS A RESULT OF A LARGE DOWNED TREE. SEVERAL OTHER TREES WERE BLOWN DOWN IN THE AREA, AND A PORTABLE GREENHOUSE WAS THROWN INTO NEARBY TREES. |
| Mar 28, 4:45 PM EDT | TSTM WND DMG | 3 Sse Sabillasville, MD | WIRES AND POLE DOWN ON EYLERS VALLEY FLINT ROAD. |
| Mar 28, 4:55 PM EDT | TSTM WND DMG | 2 Se Smithsburg, MD | TREE AND WIRES DOWN ON WOLFSVILLE ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 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
- 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.
742
WUUS51 KLWX 282023
SVRLWX
MDC013-021-043-282115-
/O.NEW.KLWX.SV.W.0002.210328T2023Z-210328T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
423 PM EDT Sun Mar 28 2021
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
Eastern Washington County in north central Maryland...
Western Carroll County in north central Maryland...
Frederick County in north central Maryland...
* Until 515 PM EDT.
* At 423 PM EDT, severe thunderstorms were located along a line
extending from near Wayne Heights to Shepherdstown, moving east at
50 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...
Frederick, Hagerstown, Westminster, Thurmont, Emmitsburg, Harry
Grove Stadium, Ballenger Creek, Mount Airy, Robinwood, Taneytown,
Walkersville, Boonsboro, Smithsburg, Braddock Heights, New Market,
Mount Aetna, Mount Lena, San Mar, Clover Hill and Discovery-Spring
Garden.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3972 7694 3938 7713 3939 7772 3953 7776
3972 7762
TIME...MOT...LOC 2023Z 264DEG 43KT 3971 7758 3944 7778
HAIL...<.75IN
WIND...60MPH
$$
DHOF4 follow-up statements
172
WWUS51 KLWX 282031
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
431 PM EDT Sun Mar 28 2021
MDC013-021-043-282115-
/O.CON.KLWX.SV.W.0002.000000T0000Z-210328T2115Z/
Washington MD-Carroll MD-Frederick MD-
431 PM EDT Sun Mar 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR EASTERN WASHINGTON...WESTERN CARROLL AND FREDERICK COUNTIES IN
NORTH CENTRAL MARYLAND...
At 431 PM EDT, severe thunderstorms with a history of producing wind
gusts to near 60 mph and wind damage were located along a line
extending from near Rouzerville to near Boonsboro, moving east at 50
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Frederick, Westminster, Thurmont, Emmitsburg, Harry Grove Stadium,
Ballenger Creek, Mount Airy, Robinwood, Taneytown, Walkersville,
Boonsboro, Smithsburg, Braddock Heights, New Market, Mount Aetna,
Mount Lena, San Mar, Clover Hill, Discovery-Spring Garden and
Wolfsville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms have a history of producing wind damage and measured
wind gusts to near 60 mph. For your protection move to an interior
room on the lowest floor of a building.
&&
LAT...LON 3972 7694 3938 7713 3939 7772 3954 7774
3972 7756
TIME...MOT...LOC 2031Z 264DEG 43KT 3972 7746 3945 7766
HAIL...<.75IN
WIND...60MPH
$$
DHOF832
WWUS51 KLWX 282039
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
439 PM EDT Sun Mar 28 2021
MDC043-282049-
/O.CAN.KLWX.SV.W.0002.000000T0000Z-210328T2115Z/
Washington MD-
439 PM EDT Sun Mar 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WASHINGTON COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3972 7694 3938 7713 3939 7765 3945 7764
3947 7762 3951 7762 3954 7760 3962 7757
3963 7754 3964 7753 3967 7749 3969 7751
3972 7747
TIME...MOT...LOC 2039Z 264DEG 43KT 3973 7736 3946 7756
$$
MDC013-021-282115-
/O.CON.KLWX.SV.W.0002.000000T0000Z-210328T2115Z/
Carroll MD-Frederick MD-
439 PM EDT Sun Mar 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR WESTERN CARROLL AND FREDERICK COUNTIES IN NORTH CENTRAL
MARYLAND...
At 439 PM EDT, severe thunderstorms were located along a line
extending from near Carroll Valley to near Braddock Heights, moving
east at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Frederick, Westminster, Thurmont, Emmitsburg, Harry Grove Stadium,
Ballenger Creek, Mount Airy, Taneytown, Walkersville, Braddock
Heights, New Market, Clover Hill, Discovery-Spring Garden,
Wolfsville, Linganore-Bartonsville, Myersville, New Windsor,
Woodsboro, Union Bridge and Libertytown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3972 7694 3938 7713 3939 7765 3945 7764
3947 7762 3951 7762 3954 7760 3962 7757
3963 7754 3964 7753 3967 7749 3969 7751
3972 7747
TIME...MOT...LOC 2039Z 264DEG 43KT 3973 7736 3946 7756
HAIL...<.75IN
WIND...60MPH
$$
DHOF969
WWUS51 KLWX 282105
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
505 PM EDT Sun Mar 28 2021
MDC013-021-282115-
/O.CON.KLWX.SV.W.0002.000000T0000Z-210328T2115Z/
Carroll MD-Frederick MD-
505 PM EDT Sun Mar 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR WESTERN CARROLL AND EAST CENTRAL FREDERICK COUNTIES IN NORTH
CENTRAL MARYLAND...
At 505 PM EDT, severe thunderstorms were located along a line
extending from Parkville to 8 miles north of Mount Airy, moving east
at 50 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...
Frederick, Westminster, Ballenger Creek, Mount Airy, Taneytown,
Walkersville, New Market, Linganore-Bartonsville, Discovery-Spring
Garden, New Windsor, Woodsboro, Union Bridge, Libertytown, Mount
Pleasant, Ladiesburg, Linwood, Uniontown, Wagners Mill, Marston and
Keymar.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3972 7694 3938 7713 3939 7740 3972 7717
TIME...MOT...LOC 2105Z 270DEG 43KT 3976 7697 3949 7717
HAIL...<.75IN
WIND...60MPH
$$
DHOF279
WWUS51 KLWX 282121 RRA
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
521 PM EDT Sun Mar 28 2021
MDC013-021-282131-
/O.EXP.KLWX.SV.W.0002.000000T0000Z-210328T2115Z/
Carroll MD-Frederick MD-
521 PM EDT Sun Mar 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CARROLL AND EAST
CENTRAL FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND HAS EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
north central Maryland.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sterling Virginia.
LAT...LON 3972 7694 3938 7713 3939 7740 3972 7717
TIME...MOT...LOC 2121Z 264DEG 43KT 3978 7673 3951 7693
$$
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, 4:30 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, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, Montgomery | 40 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.