Alert archive / Alabama / Special Marine Warnings in 2017
Special Marine Warning 252, NWS Mobile, AL
NWS Mobile, AL issued this special marine warning at Jul 20, 2017, 6:10 AM CDT. It was in force for 65 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 20, 2017, 6:10 AM CDT (11:10 UTC)
- Expired
- Jul 20, 2017, 7:15 AM CDT
- In force
- 65 min
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Mobile radar (KMOB), 74 km from the middle of the area, began a volume at 11:09 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 00:00Z, 11.2 hours before the alert went out and 147 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
- 2374 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1086 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
246
WHUS54 KMOB 201110
SMWMOB
GMZ650-201215-
/O.NEW.KMOB.MA.W.0252.170720T1110Z-170720T1215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOBILE AL
610 AM CDT THU JUL 20 2017
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
* SPECIAL MARINE WARNING FOR...
COASTAL WATERS FROM PENSACOLA FL TO PASCAGOULA MS OUT 20 NM...
* UNTIL 715 AM CDT
* AT 610 AM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR FAREWELL
BUOY...MOVING WEST AT 10 KNOTS.
HAZARD...WIND GUSTS 34 KNOTS OR GREATER.
SOURCE...RADAR INDICATED.
IMPACT...EXPECT WIND GUSTS IN EXCESS OF 34 KNOTS...SUDDENLY HIGHER
WAVES...FREQUENT LIGHTNING...AND HEAVY DOWNPOURS. MAKE
SURE ALL ON BOARD ARE WEARING LIFE JACKETS.
* LOCATIONS IMPACTED INCLUDE...
FAREWELL BUOY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE
EXPECTED.
&&
LAT...LON 3021 8810 3001 8798 2989 8823 2990 8824
2990 8825 2988 8831 3012 8836
TIME...MOT...LOC 1110Z 069DEG 12KT 3006 8816
HAIL...0.00IN
WIND...>34KTS
$$1 follow-up statement
121
FZUS74 KMOB 201206
MWSMOB
MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
706 AM CDT THU JUL 20 2017
GMZ650-201215-
/O.EXP.KMOB.MA.W.0252.000000T0000Z-170720T1215Z/
706 AM CDT THU JUL 20 2017
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 715 AM CDT...
THE AFFECTED AREAS WERE...
COASTAL WATERS FROM PENSACOLA FL TO PASCAGOULA MS OUT 20 NM...
THE THUNDERSTORM HAS WEAKENED THUS THE WARNING HAS BEEN CANCELLED.
LAT...LON 3021 8810 3001 8798 2989 8823 2990 8824
2990 8825 2988 8831 3012 8836
TIME...MOT...LOC 1205Z 069DEG 12KT 2999 8836
$$The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:23 PM CDT | Special Marine Warning | MOB | 67 min |
Nearby
Special Marine Warnings in Alabama, 2017Every special marine warning in 2017
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.