Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 101, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 4, 2021, 1:36 PM EDT for 4 counties in Maryland. It was in force for 39 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
- Jun 4, 2021, 1:36 PM EDT (17:36 UTC)
- Expired
- Jun 4, 2021, 2:15 PM EDT
- In force
- 39 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Calvert County, MD, Charles County, MD, Prince George's County, MD, Saint Mary's County, MD
The radar
The Sterling radar (KLWX), 77 km from the middle of the area, began a volume at 17:37 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 |
|---|---|---|---|
| Jun 4, 1:53 PM EDT | TSTM WND DMG | 1 S Bryantown, MD | TREES BLEW DOWN NEAR T.C. MARTIN ELEMENTARY SCHOOL. |
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 |
|---|---|---|---|
| Jun 4, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.6 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
- 381 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
921
WUUS51 KLWX 041736
SVRLWX
MDC009-017-033-037-041815-
/O.NEW.KLWX.SV.W.0101.210604T1736Z-210604T1815Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
136 PM EDT Fri Jun 4 2021
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
Northwestern St. Marys County in southern Maryland...
West central Calvert County in southern Maryland...
Southeastern Prince Georges County in central Maryland...
Northeastern Charles County in southern Maryland...
* Until 215 PM EDT.
* At 136 PM EDT, a severe thunderstorm was located over Waldorf,
moving east at 25 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...
Waldorf, La Plata, Prince Frederick, Hallowing Point, Sheridan
Point, Golden Beach, Saint Charles, Huntingtown, Hughesville,
Baden, Mechanicsville, Charlotte Hall, Aquasco, Bryantown,
Benedict, Eagle Harbor, Barstow and Oakville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3855 7696 3867 7681 3861 7653 3838 7664
TIME...MOT...LOC 1736Z 291DEG 23KT 3862 7687
HAIL...<.75IN
WIND...60MPH
$$
DHOF2 follow-up statements
453
WWUS51 KLWX 041803
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
203 PM EDT Fri Jun 4 2021
MDC009-017-033-037-041815-
/O.CON.KLWX.SV.W.0101.000000T0000Z-210604T1815Z/
St. Marys MD-Calvert MD-Prince Georges MD-Charles MD-
203 PM EDT Fri Jun 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR NORTHWESTERN ST. MARYS...WEST CENTRAL CALVERT...SOUTHEASTERN
PRINCE GEORGES AND EAST CENTRAL CHARLES COUNTIES...
At 203 PM EDT, a severe thunderstorm was located near Hallowing
Point, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Prince Frederick, Hallowing Point, Sheridan Point, Golden Beach,
Huntingtown, Hughesville, Baden, Mechanicsville, Charlotte Hall,
Aquasco, Bryantown, Benedict, Eagle Harbor, Barstow and Oakville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3854 7693 3857 7680 3864 7673 3861 7653
3838 7664
TIME...MOT...LOC 1803Z 291DEG 23KT 3856 7666
HAIL...<.75IN
WIND...60MPH
$$
RCM300
WWUS51 KLWX 041806
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
206 PM EDT Fri Jun 4 2021
MDC009-017-033-037-041816-
/O.EXP.KLWX.SV.W.0101.000000T0000Z-210604T1815Z/
St. Marys MD-Calvert MD-Prince Georges MD-Charles MD-
206 PM EDT Fri Jun 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ST. MARYS...WEST
CENTRAL CALVERT...SOUTHEASTERN PRINCE GEORGES AND EAST CENTRAL
CHARLES COUNTIES WILL EXPIRE AT 215 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southern Maryland.
LAT...LON 3854 7693 3857 7680 3864 7673 3861 7653
3838 7664
TIME...MOT...LOC 1806Z 291DEG 23KT 3856 7665
$$
RCMThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 9:00 PM EDT | Areal Flood Warning | LWX | Baltimore, Harford | 113 min |
| Jun 4, 12:36 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 39 min |
| Jun 4, 12:50 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 55 min |
| Jun 4, 2:17 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 43 min |
| Jun 4, 2:50 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 40 min |
| Jun 4, 3:19 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 41 min |
| Jun 4, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 51 min |
| Jun 4, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | Cecil | 22 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.