Alert archive / Alabama / Mesoscale Discussions in 2013
Mesoscale Discussion 1913
The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2013, 6:33 PM CDT for 7 counties in Alabama; 6 counties in Florida. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Sep 24, 2013, 6:33 PM CDT (23:33 UTC)
- Expired
- Sep 24, 2013, 8:30 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
Counties Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL
The radar
The Eglin Afb radar (KEVX), 77 km from the middle of the area, began a volume at 23:36 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, 11.6 hours before the alert went out and 232 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
- 466 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 514 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
583
ACUS11 KWNS 242333
SWOMCD
SPC MCD 242333
FLZ000-ALZ000-250130-
MESOSCALE DISCUSSION 1913
NWS STORM PREDICTION CENTER NORMAN OK
0633 PM CDT TUE SEP 24 2013
AREAS AFFECTED...FAR SRN AL...WRN FL PANHANDLE
CONCERNING...SEVERE THUNDERSTORM WATCH 535...
VALID 242333Z - 250130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 535
CONTINUES.
SUMMARY...AN ISOLATED DAMAGING WIND THREAT CONTINUES ACROSS THE
REMAINDER OF WW 535. WHILE SOME THREAT WILL LIKELY EXTEND E OF THE
WATCH...OVERALL SVR COVERAGE IS EXPECTED TO BE LOW AND A NEW WW IS
NOT PLANNED.
DISCUSSION...REGIONAL RADAR IMAGERY HAS SHOWN A CONTINUED
FORWARD-PROPAGATING TREND WITH THE LINE OF STORMS MOVING ACROSS SRN
AL AND THE WRN FL PANHANDLE. SOME WIND DAMAGE WAS REPORTED WITH THIS
LINE IN SWRN AL.
ALTHOUGH THE LINE IS EXPECTED TO CONTINUE EWD INTO SERN AL AND
W-CNTRL FL PANHANDLE...THE LOSS OF DAYTIME HEATING WILL
SIGNIFICANTLY REDUCE INSTABILITY...WITH A RESULTANT DECREASE IN THE
PROBABILITY OF ANY DAMAGING WINDS. HOWEVER...SOME ISOLATED DAMAGING
WINDS WILL REMAIN POSSIBLE AS BOTH BULK SHEAR AND LOW-LEVEL MOISTURE
REMAIN HIGH. ANTICIPATED LOW SVR COVERAGE CURRENTLY PRECLUDES THE
NEED FOR A WW AND A DOWNSTREAM WW IS NOT PLANNED AT THIS TIME.
..MOSIER/MEAD.. 09/24/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TAE...MOB...
LAT...LON 30428789 31408751 31528662 31478560 30948541 30148589
30368654 30428789SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 1:33 PM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 87 min |
| Sep 24, 2:03 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 8 more | 6 hr |
| Sep 24, 3:51 PM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Mobile, Monroe, Washington | 84 min |
| Sep 24, 12:15 PM CDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, Glades, Hendry and 5 more | 3 hr |
Nearby
Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Florida, 2013Every mesoscale discussion in 2013
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.