Alert archive / Florida / Mesoscale Discussions in 2011
Mesoscale Discussion 978
The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 10:39 AM CDT for 9 counties in Alabama; 12 counties in Florida; 6 counties in Georgia. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2011, 10:39 AM CDT (15:39 UTC)
- Expired
- May 26, 2011, 12:15 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 27 counties
Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Clay County, GA, Decatur County, GA, Early County, GA, Miller County, GA, Quitman County, GA, Seminole County, GA
The radar
The Eglin Afb radar (KEVX), 50 km from the middle of the area, began a volume at 15:41 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, 3.7 hours before the alert went out and 201 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
- 1079 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- -53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
814 ACUS11 KWNS 261539 SWOMCD SPC MCD 261539 FLZ000-GAZ000-ALZ000-261715- MESOSCALE DISCUSSION 0978 NWS STORM PREDICTION CENTER NORMAN OK 1039 AM CDT THU MAY 26 2011 AREAS AFFECTED...SRN AL...FL PANHANDLE...SWRN GA CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 261539Z - 261715Z LATEST WV IMAGERY SUGGESTS A WEAK UPPER VORT MAY BE EMBEDDED WITHIN THE BASE OF THE LARGER TROUGH OVER SERN MS. THIS FEATURE IS SHIFTING EAST TOWARD SRN AL/FL PANHANDLE AND APPEARS TO BE AIDING ONGOING CONVECTION THAT HAS GRADUALLY INTENSIFIED OVER THE LAST HOUR. RADAR DATA SUGGEST THIS ACTIVITY IS MOVING EAST AT ROUGHLY 35KT AND IS SLOWLY TAKING ON CHARACTERISTICS OF A LINEAR MCS. GIVEN THE PROGRESSIVE NATURE OF THE UPPER TROUGH LATEST THINKING IS ONGOING TSTMS WILL MIGRATE ACROSS SRN AL INTO THE FL PANHANDLE AND PERHAPS EVEN SWRN GA BY 21Z. DAMAGING WINDS MAY BE NOTED WITH THIS CONVECTION AND A SEVERE TSTM WATCH IS BEING CONSIDERED. ..DARROW.. 05/26/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TAE...BMX...MOB... LAT...LON 31478770 31888495 30638427 29498515 30098823 31478770
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 8:33 PM CDT | Tornado Watch | SPC | Bibb, Colbert, Cullman, Fayette, Franklin, Jefferson and 12 more | 7 hr |
| May 25, 10:27 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lawrence, Marion and 2 more | 2 hr |
| May 26, 7:56 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 22 more | 94 min |
| May 26, 9:15 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 38 more | 9 hr |
| May 26, 12:22 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 33 more | 83 min |
| May 26, 2:32 PM CDT | Mesoscale Discussion | SPC | Cherokee | 58 min |
| May 26, 2:44 PM CDT | Severe Thunderstorm Watch | SPC | Henry | 6 hr |
| May 26, 3:36 PM CDT | Mesoscale Discussion | SPC | Calhoun, Chambers, Cherokee, Clay, Cleburne, Etowah and 6 more | 84 min |
| May 26, 4:10 PM CDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 7 hr |
| May 26, 6:12 PM CDT | Mesoscale Discussion | SPC | Columbia, Lincoln, McDuffie | 93 min |
Nearby
Mesoscale Discussions in Florida, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Georgia, 2011Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.