Alert archive / Florida / Mesoscale Discussions in 2017
Mesoscale Discussion 95
The Storm Prediction Center issued this mesoscale discussion at Jan 21, 2017, 5:05 PM CST for 10 counties in Florida. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jan 21, 2017, 5:05 PM CST (23:05 UTC)
- Expired
- Jan 21, 2017, 6:00 PM CST
- In force
- 55 min
- Issued by
- the Storm Prediction Center
Counties Bay County, FL, Calhoun County, FL, Franklin County, FL, Gulf County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL
The radar
The Tallahassee radar (KTLH), 72 km from the middle of the area, began a volume at 23:07 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.1 hours before the alert went out and 75 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
- 352 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
The text
As transmitted.
412
ACUS11 KWNS 212305
SWOMCD
SPC MCD 212305
FLZ000-GAZ000-220000-
Mesoscale Discussion 0095
NWS Storm Prediction Center Norman OK
0505 PM CST Sat Jan 21 2017
Areas affected...Portions of the Florida Panhandle
Concerning...Tornado Watch 14...
Valid 212305Z - 220000Z
The severe weather threat for Tornado Watch 14 continues.
SUMMARY...Limited severe/tornado risk lingers across remaining
portions of Tornado Watch 14 across parts of the Florida Panhandle.
DISCUSSION...As the more vigorous portion of the broken band of
convection stretching from the South Carolina/Georgia coastal waters
westward across the Florida Panhandle continues to shift farther off
the Georgia coast, less-organized storms persist westward to the
Calhoun/Bay/Gulf county area of Florida. Storms are ongoing near
and just to the cool side of convective outflow, where sufficient
CAPE and ample shear persist. While short-term convective trends
have remained generally unchanged -- i.e. storms sub-severe,
increasing large-scale ascent is noted farther west into southeast
portions of Louisiana/Mississippi per WV and radar loops.
At this time, it appears that a relative minimum in severe risk may
persist through the scheduled 22/00Z expiration of Tornado Watch 14.
However, an anticipated increase in risk later this evening may
require additional WW issuance near or to the northwest of the
current watch.
..Goss.. 01/21/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TAE...MOB...
LAT...LON 30668350 29818438 29528517 30138598 30148666 30498651
30688574 30468417 30668350SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 3:00 AM CST | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa, Walton | 90 min |
| Jan 21, 3:56 AM CST | Tornado Watch | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton | 8 hr |
| Jan 21, 7:41 AM CST | Mesoscale Discussion | SPC | Escambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more | 94 min |
| Jan 21, 8:04 AM CST | Tornado Watch | SPC | Bay, Calhoun, Gadsden, Gulf, Jackson, Liberty and 1 more | 6 hr |
| Jan 21, 9:19 AM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Holmes, Jackson, Liberty and 3 more | 86 min |
| Jan 21, 12:06 PM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Gulf, Hamilton, Jackson and 6 more | 114 min |
| Jan 21, 1:12 PM CST | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 3 more | 5 hr |
| Jan 21, 3:03 PM CST | Mesoscale Discussion | SPC | Baker, Columbia, Franklin, Gilchrist, Gulf, Hamilton and 9 more | 57 min |
Nearby
Mesoscale Discussions in Florida, 2017Every mesoscale discussion in 2017
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.