Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 306, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 23, 2021, 9:46 AM EDT for 4 counties in Maryland. It was in force for 44 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
- Sep 23, 2021, 9:46 AM EDT (13:46 UTC)
- Expired
- Sep 23, 2021, 10:30 AM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 45 km from the middle of the area, began a volume at 13:45 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 |
|---|---|---|---|
| Sep 23, 10:12 AM EDT | TSTM WND DMG | 2 Nnw Morgnec, MD | DOWNED TREE LIMBS AND WIRES NEAR WALLIS ROAD. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 1.8 hours before the alert went out and 111 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
- 579 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 743 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
The text
As transmitted.
061
WUUS51 KPHI 231346
SVRPHI
MDC011-029-035-041-231430-
/O.NEW.KPHI.SV.W.0306.210923T1346Z-210923T1430Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
946 AM EDT Thu Sep 23 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Talbot County in eastern Maryland...
Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
Kent County in northeastern Maryland...
* Until 1030 AM EDT.
* At 945 AM EDT, severe thunderstorms were located along a line
extending from near Aberdeen Proving Ground to 6 miles southwest of
Cambridge, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Easton, Centerville, Chestertown, Denton, Centreville,
Federalsburg, Greensboro, Oakland, Ridgely, Trappe, Church Hill,
Preston, Millington, Sudlersville, Betterton, Goldsboro, Queen
Anne, Smithville, Old Town and Starr.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3859 7606 3863 7608 3862 7611 3865 7615
3933 7614 3937 7611 3938 7606 3936 7589
3937 7577 3866 7571 3864 7571 3869 7577
3868 7580 3871 7584 3870 7590 3866 7596
3860 7599 3857 7603
TIME...MOT...LOC 1345Z 209DEG 36KT 3950 7611 3848 7612
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Iovino1 follow-up statement
033
WWUS51 KPHI 231412
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1012 AM EDT Thu Sep 23 2021
MDC011-029-035-041-231430-
/O.CON.KPHI.SV.W.0306.000000T0000Z-210923T1430Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
1012 AM EDT Thu Sep 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM EDT
FOR TALBOT...QUEEN ANNE'S...CAROLINE AND KENT COUNTIES...
At 1012 AM EDT, severe thunderstorms were located along a line
extending from Calvert to near Hambleton, moving north at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Easton, Centerville, Chestertown, Denton, Centreville, Federalsburg,
Greensboro, Oakland, Ridgely, Trappe, Church Hill, Preston,
Millington, Sudlersville, Betterton, Goldsboro, Queen Anne,
Smithville, Old Town and Starr.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3859 7606 3863 7608 3862 7611 3865 7615
3933 7614 3937 7611 3938 7606 3936 7589
3937 7577 3866 7571 3864 7571 3869 7577
3868 7580 3871 7584 3870 7590 3866 7596
3860 7599 3857 7603
TIME...MOT...LOC 1412Z 201DEG 34KT 3972 7601 3870 7602
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 8:08 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's, Talbot | 52 min |
| Sep 23, 9:03 AM EDT | Areal Flood Advisory | PHI | Kent, Queen Anne's, Talbot | 3 hr |
| Sep 23, 9:31 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's, Talbot | 59 min |
| Sep 23, 9:49 AM EDT | Flash Flood Warning | PHI | Kent, Queen Anne's, Talbot | 4 hr |
| Sep 23, 10:35 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 40 min |
| Sep 23, 10:55 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
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.