Alert archive / Alabama / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 113
The Storm Prediction Center issued this severe thunderstorm watch at Apr 25, 2015, 1:36 PM CDT for 11 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2015, 1:36 PM CDT (18:36 UTC)
- Expired
- Apr 25, 2015, 5:15 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 2:21 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 24 min |
| Apr 25, 2:47 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Mobile | 43 min |
| Apr 25, 2:48 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Escambia, Monroe | 27 min |
| Apr 25, 3:26 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 64 min |
| Apr 25, 3:48 PM CDT | Severe Thunderstorm Warning | MOB | Butler, Conecuh, Covington, Crenshaw, Escambia | 57 min |
| Apr 25, 3:57 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa, Santa Rosa | 53 min |
| Apr 25, 4:38 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa | 26 min |
| Apr 25, 4:43 PM CDT | Severe Thunderstorm Warning | MOB | Butler, Covington, Crenshaw | 24 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 6.6 hours before the alert went out and 214 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
- 1826 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 565 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 4.6
The text
As transmitted, in the capitals the NWS used until 2016.
253 WWUS20 KWNS 251833 SEL3 SPC WW 251833 ALZ000-FLZ000-CWZ000-260200- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 113 NWS STORM PREDICTION CENTER NORMAN OK 135 PM CDT SAT APR 25 2015 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHWEST ALABAMA WESTERN FLORIDA PANHANDLE COASTAL WATERS * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 900 PM CDT. * PRIMARY THREATS INCLUDE... ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SUMMARY...SEVERE STORMS ONGOING OVER SOUTHEAST MISSISSIPPI ARE EXPECTED TO SPREAD EAST ACROSS THE WATCH AREA THIS AFTERNOON INTO EVENING. LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY HAZARDS WITH THESE STORMS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF PENSACOLA FLORIDA TO 35 MILES NORTH NORTHWEST OF EVERGREEN ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. && OTHER WATCH INFORMATION...CONTINUE...WW 110...WW 111...WW 112... AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 27035. ...MEAD
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 12:50 AM CDT | Tornado Watch | SPC | Dallas, Fayette, Greene, Hale, Lamar, Marengo and 4 more | 6 hr |
| Apr 25, 2:07 AM CDT | Mesoscale Discussion | SPC | Choctaw, Greene, Pickens, Sumter, Tuscaloosa | 83 min |
| Apr 25, 4:12 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 9 more | 63 min |
| Apr 25, 5:00 AM CDT | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bullock, Butler, Clarke and 18 more | 7 hr |
| Apr 25, 7:41 AM CDT | Mesoscale Discussion | SPC | Coffee, Covington, Dale, Geneva, Henry, Houston | 94 min |
| Apr 25, 9:35 AM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 115 min |
| Apr 25, 1:50 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more | 85 min |
| Apr 25, 2:10 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Bullock, Calhoun, Chambers, Chilton and 19 more | 95 min |
| Apr 25, 3:07 PM CDT | Severe Thunderstorm Watch | SPC | Barbour, Coffee, Dale, Geneva, Henry, Houston and 1 more | 7 hr |
| Apr 25, 4:38 PM CDT | Severe Thunderstorm Watch | SPC | Bullock, Chambers, Clay, Lee, Macon, Randolph and 2 more | 5 hr |
| Apr 25, 8:08 AM CDT | Tornado Watch | SPC | Baker, Calhoun, Columbia, Duval, Franklin, Gadsden and 11 more | 7 hr |
| Apr 25, 11:20 AM CDT | Mesoscale Discussion | SPC | Columbia, Gadsden, Hamilton, Jefferson, Lafayette, Leon and 5 more | 85 min |
| Apr 25, 2:30 PM CDT | Mesoscale Discussion | SPC | Baker, Columbia, Duval, Gadsden, Hamilton, Jefferson and 5 more | 60 min |
| Apr 25, 6:19 PM CDT | Mesoscale Discussion | SPC | Calhoun, Franklin, Gadsden, Gulf, Hamilton, Jackson and 6 more | 56 min |
Nearby
Severe Thunderstorm Watches in Alabama, 2015Severe Thunderstorm Watches in Florida, 2015Every severe thunderstorm watch in 2015
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.