Alert archive / Alabama / Special Marine Warnings in 2021
Special Marine Warning 13, NWS Mobile, AL
NWS Mobile, AL issued this special marine warning at Jan 7, 2021, 11:08 AM CST. It was in force for 37 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
- Jan 7, 2021, 11:08 AM CST (17:08 UTC)
- Expired
- Jan 7, 2021, 11:45 AM CST
- In force
- 37 min
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.1 hours before the alert went out and 182 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1457 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 197 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
772
WHUS54 KMOB 071708
SMWMOB
GMZ636-071745-
/O.NEW.KMOB.MA.W.0013.210107T1708Z-210107T1745Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mobile AL
1108 AM CST Thu Jan 7 2021
The National Weather Service in Mobile has issued a
* Special Marine Warning for...
Eastern Choctawhatchee Bay...
* Until 1145 AM CST.
* At 1108 AM CST, a strong thunderstorm was located 7 nm southeast of
Santa Rosa Beach, moving northeast at 35 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...
East Choctawhatchee Bay and Highway 331 Bridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3043 8625 3043 8626 3042 8626 3040 8623
3042 8631 3049 8625 3049 8620 3045 8619
3047 8614 3043 8615 3045 8608 3042 8609
3040 8610
TIME...MOT...LOC 1708Z 212DEG 36KT 3027 8618
HAIL...0.00IN
WIND...>34KTS
$$1 follow-up statement
156
FZUS74 KMOB 071741
MWSMOB
Marine Weather Statement
National Weather Service Mobile AL
1141 AM CST Thu Jan 7 2021
GMZ636-071750-
/O.EXP.KMOB.MA.W.0013.000000T0000Z-210107T1745Z/
1141 AM CST Thu Jan 7 2021
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 1145 AM CST...
The affected areas were...
Eastern Choctawhatchee Bay...
The showers are moving away and no longer poses a significant threat
to boaters.
LAT...LON 3043 8625 3043 8626 3042 8626 3040 8623
3042 8631 3049 8625 3049 8620 3045 8619
3047 8614 3043 8615 3045 8608 3042 8609
3040 8610
TIME...MOT...LOC 1740Z 212DEG 36KT 3053 8600
$$The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 7, 4:44 AM CST | Special Marine Warning | MOB | 91 min | |
| Jan 7, 6:14 AM CST | Special Marine Warning | MOB | 2 hr | |
| Jan 7, 6:46 AM CST | Special Marine Warning | MOB | 29 min | |
| Jan 7, 8:05 AM CST | Special Marine Warning | MOB | 55 min |
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.