Alert archive / Florida / Mesoscale Discussions in 2011
Mesoscale Discussion 322
The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2011, 12:12 PM EDT for 28 counties in Florida. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2011, 12:12 PM EDT (16:12 UTC)
- Expired
- Mar 31, 2011, 1:15 PM EDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 28 counties
Brevard County, FL, Charlotte County, FL, Citrus County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Pasco County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Tampa radar (KTBW), 78 km from the middle of the area, began a volume at 16:16 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 4.2 hours before the alert went out and 78 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
- 728 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 787 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 543 m²/s²
- 0-3 km storm-relative helicity
- 606 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.9
The text
As transmitted, in the capitals the NWS used until 2016.
585 ACUS11 KWNS 311612 SWOMCD SPC MCD 311612 FLZ000-311715- MESOSCALE DISCUSSION 0322 NWS STORM PREDICTION CENTER NORMAN OK 1112 AM CDT THU MAR 31 2011 AREAS AFFECTED...CNTRL/SRN FL PENINSULA CONCERNING...TORNADO WATCH 80... VALID 311612Z - 311715Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 80 CONTINUES. ...TORNADO WATCH WILL BE REPLACED BY 17Z ACROSS MUCH OF THE CNTRL/SRN FL PENINSULA... FAST-MOVING BOW-TYPE ECHO IS RACING EWD AT ROUGHLY 50KT OVER POLK COUNTY. GIVEN THIS SPEED/MOVEMENT...IT APPEARS THE LEADING EDGE WILL MOVE OFF THE ATLANTIC COAST BY 18Z. ADDITIONALLY...TRAILING TSTMS WILL LIKELY INTENSIFY SWWD TOWARD THE GULF COAST THEN SPREAD ACROSS MUCH OF THE PENINSULA AS FLOW GRADUALLY VEERS. DESPITE THIS VEERING FLOW IT APPEARS SUFFICIENT SHEAR EXISTS FOR A CONTINUED TORNADO THREAT...ESPECIALLY NEAR CONVECTIVE OUTFLOW FROM EARLIER ACTIVITY. FOR THIS REASON CONDITIONS WILL WARRANT A NEW TORNADO WATCH SHORTLY. FARTHER SOUTH...SEVERE THREAT MAY BE DELAYED ACROSS EXTREME SRN FL AND MUCH OF MFL COUNTY WARNING AREA MAY NOT EXPERIENCE STRONG/SEVERE STORMS UNTIL LATER THIS AFTERNOON/EVENING. ..DARROW.. 03/31/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MFL...MLB...TBW...JAX...TAE... LAT...LON 29378322 29368074 26367969 26368211 29378322
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 4:40 AM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Citrus, Columbia, Dixie, Franklin and 19 more | 2 hr |
| Mar 31, 6:00 AM EDT | Tornado Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more | 7 hr |
| Mar 31, 9:39 AM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 21 more | 66 min |
| Mar 31, 12:46 PM EDT | Tornado Watch | SPC | Brevard, Charlotte, DeSoto, Glades, Hardee, Hendry and 15 more | 7 hr |
| Mar 31, 2:56 PM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 10 more | 64 min |
| Mar 31, 6:22 PM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 10 more | 83 min |
Nearby
Mesoscale Discussions in Florida, 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.