Alert archive / Maryland / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 310, NWS Baltimore/Washington

July 18, 2022Calvert County, Saint Mary's County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 18, 2022, 6:57 PM EDT for Calvert County, Saint Mary's County, Maryland. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 18, 2022, 6:57 PM EDT (22:57 UTC)
Expired: Jul 18, 2022, 7:20 PM EDT
In force: 23 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calvert County, MD, Saint Mary's County, MD

The radar

The Dover AFB radar (KDOX), 101 km from the middle of the area, began a volume at 23:01 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.0 hours before the alert went out and 99 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 324 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

662 
WUUS51 KLWX 182257
SVRLWX
MDC009-037-182345-
/O.NEW.KLWX.SV.W.0310.220718T2257Z-220718T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
657 PM EDT Mon Jul 18 2022

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  North central St. Marys County in southern Maryland...
  Southeastern Calvert County in southern Maryland...

* Until 745 PM EDT.

* At 657 PM EDT, a severe thunderstorm was located near Sheridan
  Point, moving east at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  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...
  Saint Leonard Creek, Flag Harbor, Calvert Cliffs, Saint Leonard,
  Long Beach and Calvert Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3839 7638 3839 7661 3845 7662 3850 7648
      3842 7639
TIME...MOT...LOC 2257Z 257DEG 16KT 3842 7659 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJL

2 follow-up statements

011 
WWUS51 KLWX 182311
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
711 PM EDT Mon Jul 18 2022

MDC009-037-182345-
/O.CON.KLWX.SV.W.0310.000000T0000Z-220718T2345Z/
St. Marys MD-Calvert MD-
711 PM EDT Mon Jul 18 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR NORTHEASTERN ST. MARYS AND SOUTHEASTERN CALVERT COUNTIES...

At 711 PM EDT, a severe thunderstorm was located over Saint Leonard,
or over Flag Harbor, moving east at 20 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...
Saint Leonard Creek, Flag Harbor, Calvert Cliffs, Saint Leonard, Long
Beach and Calvert Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3839 7638 3839 7659 3846 7654 3848 7645
      3842 7639
TIME...MOT...LOC 2311Z 257DEG 16KT 3843 7651 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJL

152 
WWUS51 KLWX 182320
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
720 PM EDT Mon Jul 18 2022

MDC009-037-182330-
/O.CAN.KLWX.SV.W.0310.000000T0000Z-220718T2345Z/
St. Marys MD-Calvert MD-
720 PM EDT Mon Jul 18 2022

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. MARYS AND
SOUTHEASTERN CALVERT COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 3839 7638 3839 7659 3846 7654 3848 7645
      3842 7639
TIME...MOT...LOC 2319Z 257DEG 16KT 3844 7646 

$$

CJL

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 9:31 AM EDT	Flood Watch	LWX	Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 2 more	12 hr
Jul 18, 2:30 PM EDT	Severe Thunderstorm Warning	LWX	Washington	45 min
Jul 18, 3:06 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Washington	39 min
Jul 18, 3:38 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	52 min
Jul 18, 3:44 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Montgomery	34 min
Jul 18, 3:56 PM EDT	Tornado Warning	LWX	Carroll	22 min
Jul 18, 4:12 PM EDT	Tornado Warning	LWX	Baltimore, Carroll	14 min
Jul 18, 4:22 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Harford, City of Baltimore	38 min
Jul 18, 4:25 PM EDT	Tornado Warning	LWX	Baltimore	6 min
Jul 18, 4:56 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Cecil, Harford	49 min
Jul 18, 5:38 PM EDT	Severe Thunderstorm Warning	LWX	Cecil	19 min
Jul 18, 6:03 PM EDT	Severe Thunderstorm Warning	LWX	Cecil	15 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2022 Every severe thunderstorm warning in 2022

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.