Alert archive / Maryland / Flash Flood Warnings in 2021
Flash Flood Warning 23, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jul 8, 2021, 11:13 PM EDT for Saint Mary's County, Maryland. It was in force for 76 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 8, 2021, 11:13 PM EDT (03:13 UTC)
- Expired
- Jul 9, 2021, 12:29 AM EDT
- In force
- 76 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Saint Mary's County, MD
The radar
The Dover AFB radar (KDOX), 113 km from the middle of the area, began a volume at 03:15 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
Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.2 hours before the alert went out and 95 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
- 440 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 675 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 336 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.3
The text
As transmitted.
865
WGUS51 KLWX 090313
FFWLWX
MDC037-090615-
/O.NEW.KLWX.FF.W.0023.210709T0313Z-210709T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
1113 PM EDT Thu Jul 8 2021
The National Weather Service in Sterling Virginia has issued a
* Flash Flood Warning for...
Southeastern St. Marys County in southern Maryland...
* Until 215 AM EDT.
* At 1113 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area within 1 hour. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Lexington Park... Piney Point...
Tall Timbers... Saint Marys City...
Saint Marys River... Saint Inigoes Creek...
Saint George Island... Saint Inigoes...
Park Hall... Drayden...
Dameron...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3816 7654 3818 7651 3818 7652 3819 7651
3821 7649 3823 7647 3825 7644 3825 7643
3825 7638 3823 7638 3824 7637 3823 7636
3817 7632 3815 7634 3811 7640 3810 7644
3810 7643 3809 7644 3812 7653
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
BJL1 follow-up statement
108
WGUS71 KLWX 090429
FFSLWX
Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
1229 AM EDT Fri Jul 9 2021
MDC037-090439-
/O.CAN.KLWX.FF.W.0023.000000T0000Z-210709T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Marys MD-
1229 AM EDT Fri Jul 9 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN ST. MARYS
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3816 7654 3818 7651 3818 7652 3819 7651
3821 7649 3823 7647 3825 7644 3825 7643
3825 7638 3823 7638 3824 7637 3823 7636
3817 7632 3815 7634 3811 7640 3810 7644
3810 7643 3809 7644 3812 7653
$$
BJLThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 10:31 PM EDT | Tornado Warning | LWX | Saint Mary's | 29 min |
| Jul 8, 11:13 PM EDT | Tornado Warning | LWX | Calvert, Saint Mary's | 17 min |
| Jul 9, 12:40 AM EDT | Coastal Flood Warning | LWX | Saint Mary's | 2 hr |
| Jul 9, 12:47 AM EDT | Coastal Flood Advisory | LWX | Charles | 2 hr |
| Jul 9, 4:56 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 49 min |
| Jul 9, 5:02 PM EDT | Areal Flood Warning | LWX | Prince George's | 3 hr |
| Jul 9, 5:30 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's | 45 min |
| Jul 9, 5:54 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 51 min |
| Jul 9, 6:03 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 57 min |
| Jul 9, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 31 min |
| Jul 9, 6:19 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 41 min |
| Jul 9, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 32 min |
| Jul 9, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 50 min |
| Jul 9, 7:05 PM EDT | Areal Flood Warning | LWX | Calvert, Charles, Prince George's | 3 hr |
Nearby
Flash Flood Warnings in Maryland, 2021Every flash flood 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.