Alert archive / Maryland / Areal Flood Advisories in 2021
Areal Flood Advisory 97, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 29, 2021, 12:12 PM EDT for Caroline County, Talbot County, Maryland. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2021, 12:12 PM EDT (16:12 UTC)
- Expired
- Jul 29, 2021, 1:36 PM EDT
- In force
- 84 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Caroline County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 56 km from the middle of the area, began a volume at 16:13 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 12:00Z, 4.2 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.
- Mixed-layer CAPE
- 581 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 863 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
445
WGUS81 KPHI 291612
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1212 PM EDT Thu Jul 29 2021
MDC011-041-291915-
/O.NEW.KPHI.FA.Y.0097.210729T1612Z-210729T1915Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Caroline MD-Talbot MD-
1212 PM EDT Thu Jul 29 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Southwestern Caroline County in eastern Maryland...
Southeastern Talbot County in eastern Maryland...
* Until 315 PM EDT.
* At 1212 PM EDT, Doppler radar indicated heavy rain due to
thunderstorms. Between 1 and 2 inches of rain have fallen for some
areas. Minor flooding is ongoing or expected to begin shortly in
the advisory area.
* Some locations that will experience flooding include...
Trappe, Preston, Oxford, Hambleton, Windyhill, and Choptank.
LAT...LON 3871 7615 3872 7607 3873 7599 3871 7590
3869 7590 3868 7593 3867 7595 3865 7596
3863 7598 3860 7599 3861 7608 3863 7609
3862 7611 3863 7612 3864 7613 3864 7615
3866 7615 3867 7617
$$
Robertson1 follow-up statement
886
WGUS81 KPHI 291736
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
136 PM EDT Thu Jul 29 2021
MDC011-041-291746-
/O.CAN.KPHI.FA.Y.0097.000000T0000Z-210729T1915Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Caroline MD-Talbot MD-
136 PM EDT Thu Jul 29 2021
...FLOOD ADVISORY IS CANCELLED FOR SOUTHWESTERN CAROLINE AND
SOUTHEASTERN TALBOT COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3871 7615 3872 7607 3873 7599 3871 7590
3869 7590 3868 7593 3867 7595 3865 7596
3863 7598 3860 7599 3861 7608 3863 7609
3862 7611 3863 7612 3864 7613 3864 7615
3866 7615 3867 7617
$$
RobertsonThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 11:35 AM EDT | Special Weather Statement | PHI | Talbot | 55 min |
| Jul 29, 11:48 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 45 min |
| Jul 29, 5:59 PM EDT | Special Weather Statement | PHI | Queen Anne's | 31 min |
Nearby
Areal Flood Advisories in Maryland, 2021Every areal flood advisory 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.