Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 14, NWS Mobile, AL

March 5, 2011Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 5, 2011, 4:17 PM CST for Baldwin County, Mobile County, Alabama. It was in force for 58 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 5, 2011, 4:17 PM CST (22:17 UTC)
Expired: Mar 5, 2011, 5:15 PM CST
In force: 58 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 42 km from the middle of the area, began a volume at 22:19 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.

What was reported inside it

Time	Report	Where	Remark
Mar 5, 4:35 PM CST	TSTM WND DMG	3 Se Delchamps, AL	TREE AND POWER LINES DOWN AT HIGHWAY 188 AND DAUPHIN ISLAND PARKWAY.
Mar 5, 4:42 PM CST	MARINE TSTM WIND 47	Fort Morgan, AL	41 KNOT WIND GUST REPORTED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 5, 3:13 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.3 hours before the alert went out and 166 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 960 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 451 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

221 
WUUS54 KMOB 052217
SVRMOB
ALC003-097-052315-
/O.NEW.KMOB.SV.W.0014.110305T2217Z-110305T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
417 PM CST SAT MAR 5 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITIES OF...ORANGE BEACH...GULF SHORES...SPANISH
  FORT...ROBERTSDALE...POINT CLEAR...LOXLEY...FOLEY...FAIRHOPE...
  DAPHNE...
  EXTREME SOUTHEAST MOBILE COUNTY IN SOUTHWEST ALABAMA...THIS
  INCLUDES THE CITY OF DAUPHIN ISLAND...

* UNTIL 515 PM CST

* AT 415 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES WEST OF DAUPHIN ISLAND TO 10 MILES SOUTH OF DAUPHIN
  ISLAND...AND MOVING NORTHEAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SAND ISLAND AND DAUPHIN ISLAND AROUND 425 PM CST...
  EAST END OF DAUPHIN AROUND 435 PM CST...
  BELLEFONTAINE AND PALMETTO BEACH AROUND 455 PM CST...
  GULF SHORES AROUND 505 PM CST...
  OAK...BON SECOUR...POINT CLEAR AND MOUTH OF WEEKS BAY AROUND 510 PM
  CST...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 32 AND 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CST SATURDAY EVENING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3022 8804 3025 8831 3027 8813 3035 8828
      3038 8826 3034 8820 3039 8826 3056 8808
      3049 8795 3057 8791 3067 8797 3072 8793
      3061 8768 3044 8756 3031 8754 3029 8754
      3022 8779 3023 8798 3019 8805 3019 8806
TIME...MOT...LOC 2216Z 219DEG 24KT 3025 8826 3022 8819
          3013 8814

$$

PURDY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 5, 11:54 AM CST	Severe Thunderstorm Warning	MOB	Washington	50 min
Mar 5, 1:16 PM CST	Flash Flood Watch	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	6 hr
Mar 5, 1:39 PM CST	Areal Flood Advisory	MOB	Choctaw, Washington	2 hr
Mar 5, 3:23 PM CST	Flash Flood Warning	MOB	Choctaw, Washington	3 hr
Mar 5, 3:27 PM CST	Marine Weather Statement	MOB		3 hr
Mar 5, 3:40 PM CST	Special Marine Warning	MOB		50 min
Mar 5, 3:59 PM CST	Special Marine Warning	MOB		61 min
Mar 5, 4:17 PM CST	Areal Flood Advisory	MOB	Baldwin, Mobile	118 min
Mar 5, 4:32 PM CST	Special Marine Warning	MOB		58 min
Mar 5, 5:01 PM CST	Special Marine Warning	MOB		32 min
Mar 5, 5:44 PM CST	Special Marine Warning	MOB		91 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.