Alert archive / Alabama / Special Marine Warnings in 2016

Special Marine Warning 252, NWS Mobile, AL

September 1, 2016

NWS Mobile, AL issued this special marine warning at Sep 1, 2016, 3:41 PM CDT. It was in force for 49 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
Sep 1, 2016, 3:41 PM CDT (20:41 UTC)
Expired
Sep 1, 2016, 4:30 PM CDT
In force
49 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

The radar

The Eglin Afb radar (KEVX), 40 km from the middle of the area, began a volume at 20:41 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.7 hours before the alert went out and 194 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.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2016-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 365 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2016-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
365 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

053 
WHUS54 KMOB 012041
SMWMOB
GMZ635-012130-
/O.NEW.KMOB.MA.W.0252.160901T2041Z-160901T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOBILE AL
341 PM CDT THU SEP 1 2016

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  CHOCTAWHATCHEE BAY...

* UNTIL 430 PM CDT

* AT 340 PM CDT...DOPPLER RADAR INDICATED AN OUTER RAIN BAND
  ASSOCIATED WITH HURRICANE HERMINE CAPABLE OF PRODUCING WINDS 34
  KNOTS OR GREATER. THESE SHOWERS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR HIGHWAY 331 BRIDGE TO NEAR EAST CHOCTAWHATCHEE
  BAY TO NEAR SANTA ROSA BEACH...MOVING WEST AT 20 KNOTS.

* LOCATIONS IMPACTED INCLUDE...
  SHALIMAR...HIGHWAY 331 BRIDGE...EAST CHOCTAWHATCHEE BAY...MID BAY
  BRIDGE...WEST CHOCTAWHATCHEE BAY...DESTIN AND SANTA ROSA BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS...HIGH WAVES...AND HEAVY RAINS.
BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY UNTIL THESE STORMS PASS.

&&

LAT...LON 3043 8612 3038 8617 3043 8626 3039 8625
      3039 8629 3042 8631 3038 8633 3040 8659
      3045 8665 3050 8661 3049 8653 3055 8650
      3053 8640 3045 8639 3048 8632 3047 8622
      3050 8620 3045 8619 3047 8614 3043 8616
TIME...MOT...LOC 2040Z 103DEG 21KT 3050 8614 3042 8625 3035 8628 

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 1, 11:39 AM CDTSpecial Marine WarningMOB96 min
Sep 1, 2:17 PM CDTSpecial Marine WarningMOB88 min

Nearby

Special Marine Warnings in Alabama, 2016Every special marine warning in 2016

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.