Alert archive / Alabama / Special Marine Warnings in 2021
Special Marine Warning 252, NWS Mobile, AL
NWS Mobile, AL issued this special marine warning at Aug 14, 2021, 4:46 PM CDT. It was in force for 56 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
- Aug 14, 2021, 4:46 PM CDT (21:46 UTC)
- Expired
- Aug 14, 2021, 5:42 PM CDT
- In force
- 56 min
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Mobile radar (KMOB), 108 km from the middle of the area, began a volume at 21:50 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.8 hours before the alert went out and 245 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
- 747 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1022 m above ground
- 0-6 km bulk shear
- 1 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
588
WHUS54 KMOB 142146
SMWMOB
GMZ634-142315-
/O.NEW.KMOB.MA.W.0252.210814T2146Z-210814T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mobile AL
446 PM CDT Sat Aug 14 2021
The National Weather Service in Mobile has issued a
* Special Marine Warning for...
Pensacola Bay Area including Santa Rosa Sound...
* Until 615 PM CDT.
* At 446 PM CDT, a strong thunderstorm was located 7 nm north of
Blackwater Bay Bridge, or 26 nm northwest of Mary Esther, moving
south at 10 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Pensacola Bay, West Santa Rosa Sound, Escambia Bay Bridge, East
Bay, Escambia Bay, Pensacola Bay Bridge and Garcon Point Bridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
Frequent lightning is occurring with this storm. If caught on the
open water stay below deck if possible, keep away from ungrounded
metal objects.
&&
LAT...LON 3052 8711 3045 8710 3044 8710 3045 8707
3058 8699 3041 8701 3036 8720 3035 8716
3038 8701 3036 8702 3033 8731 3034 8727
3034 8728 3035 8727 3037 8727 3036 8733
3043 8717 3049 8715 3059 8721
TIME...MOT...LOC 2146Z 003DEG 12KT 3070 8703
HAIL...0.00IN
WIND...>34KTS
$$
MM2 follow-up statements
056
FZUS74 KMOB 142224
MWSMOB
Marine Weather Statement
National Weather Service Mobile AL
524 PM CDT Sat Aug 14 2021
GMZ634-142315-
/O.CON.KMOB.MA.W.0252.000000T0000Z-210814T2315Z/
524 PM CDT Sat Aug 14 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 615 PM CDT...
For the following areas...
Pensacola Bay Area including Santa Rosa Sound...
At 523 PM CDT, a strong thunderstorm was located over Blackwater Bay
Bridge, or 20 nm northeast of Pensacola Pass, moving south at 10
knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Pensacola Bay, West Santa Rosa Sound, Escambia Bay Bridge, East Bay,
Escambia Bay, Pensacola Bay Bridge and Garcon Point Bridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
Frequent lightning is occurring with this storm. If caught on the
open water stay below deck if possible, keep away from ungrounded
metal objects.
&&
LAT...LON 3052 8711 3045 8710 3044 8710 3045 8707
3058 8699 3041 8701 3036 8720 3035 8716
3038 8701 3036 8702 3033 8731 3034 8727
3034 8728 3035 8727 3037 8727 3036 8733
3043 8717 3049 8715 3059 8721
TIME...MOT...LOC 2223Z 003DEG 12KT 3057 8704
HAIL...0.00IN
WIND...>34KTS
$$
MM076
FZUS74 KMOB 142242
MWSMOB
Marine Weather Statement
National Weather Service Mobile AL
542 PM CDT Sat Aug 14 2021
GMZ634-142251-
/O.CAN.KMOB.MA.W.0252.000000T0000Z-210814T2315Z/
542 PM CDT Sat Aug 14 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Pensacola Bay Area including Santa Rosa Sound...
The thunderstorm has weakened and no longer poses a significant
threat to boaters.
LAT...LON 3052 8711 3045 8710 3044 8710 3045 8707
3058 8699 3041 8701 3036 8720 3035 8716
3038 8701 3036 8702 3033 8731 3034 8727
3034 8728 3035 8727 3037 8727 3036 8733
3043 8717 3049 8715 3059 8721
TIME...MOT...LOC 2238Z 003DEG 12KT 3051 8704
$$
MMThe office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 1:02 PM CDT | Rip Current Statement | MOB | Baldwin, Mobile | 4 days |
| Aug 14, 1:02 PM CDT | High Surf Advisory | MOB | Baldwin, Mobile | 57 hr |
| Aug 14, 2:16 PM CDT | Special Weather Statement | MOB | Baldwin | 44 min |
| Aug 14, 3:14 PM CDT | Special Weather Statement | MOB | Mobile | 46 min |
| Aug 14, 4:13 PM CDT | Tropical Storm Watch | MOB | Covington, Escambia | 30 hr |
| Aug 14, 4:41 PM CDT | Special Marine Warning | MOB | 94 min | |
| Aug 14, 5:52 PM CDT | Special Marine Warning | MOB | 83 min | |
| Aug 14, 6:28 PM CDT | Special Weather Statement | MOB | Butler | 47 min |
| Aug 14, 4:01 PM CDT | Special Weather Statement | MOB | Okaloosa, Santa Rosa | 59 min |
| Aug 14, 4:18 PM CDT | Special Weather Statement | MOB | Escambia | 57 min |
| Aug 14, 4:33 PM CDT | Severe Thunderstorm Warning | MOB | Escambia, Santa Rosa | 42 min |
| Aug 14, 4:39 PM CDT | Special Weather Statement | MOB | Okaloosa | 66 min |
| Aug 14, 4:49 PM CDT | Special Weather Statement | MOB | Escambia | 56 min |
| Aug 14, 5:10 PM CDT | Areal Flood Advisory | MOB | Santa Rosa | 3 hr |
Nearby
Special Marine Warnings in Alabama, 2021Every special marine 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.