Alert archive / Florida / Mesoscale Discussions in 2011
Mesoscale Discussion 26
The Storm Prediction Center issued this mesoscale discussion at Jan 17, 2011, 3:23 PM EST for Broward County, Miami-Dade County, Monroe County, Florida. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jan 17, 2011, 3:23 PM EST (20:23 UTC)
- Expired
- Jan 17, 2011, 5:00 PM EST
- In force
- 97 min
- Issued by
- the Storm Prediction Center
Counties Broward County, FL, Miami-Dade County, FL, Monroe County, FL
The radar
The Miami radar (KAMX), 87 km from the middle of the area, began a volume at 20:23 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
Key West, FL (KEYW), launched 12:00Z, 8.4 hours before the alert went out and 95 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
- 672 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 502 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
793
ACUS11 KWNS 172024
SWOMCD
SPC MCD 172023
FLZ000-172200-
MESOSCALE DISCUSSION 0026
NWS STORM PREDICTION CENTER NORMAN OK
0223 PM CST MON JAN 17 2011
AREAS AFFECTED...SRN FL
CONCERNING...TORNADO WATCH 5...6...
VALID 172023Z - 172200Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 5...6...CONTINUES.
NRN ZONE OF STORMS FROM TPA TO MLB HAS WEAKENED AS THE INFLUENCE OF
THE UPPER SHORTWAVE TO THE N HAS WANED AND STORM ARE NO LONGER BEING
GENERATED UPSTREAM ALONG THE BOUNDARY. WITH CLOUDS AND RAIN
OVERSPREADING MUCH OF THE AREA...FURTHER DESTABILIZATION IS UNLIKELY
FARTHER S...WIDESPREAD RAIN AND EMBEDDED STORMS HAVE ALSO OVERSPREAD
FAR SRN FL...WITH A FEW CELLS SHOWING ROTATION OFF THE SERN COAST.
SURFACE ANALYSIS...AS WELL AS AN 18Z KEY SOUNDING...SHOWS A
MODERATELY UNSTABLE AIR MASS WITH DEWPOINTS RISING TO AROUND 70 F.
ALTHOUGH WIND ALOFT ARE VEERING...ADDITIONAL ACTIVITY IS INCREASING
IN INTENSITY W OF THE KEYS. THESE STORMS WILL LIKELY CONTAIN STRONG
AND POSSIBLY DAMAGING WIND GUSTS AS THEY AFFECT THE FL KEYS AND
EVENTUALLY THE SRN PENINSULA. THE TORNADO THREAT APPEARS TO BE
LESSENING WITH TIME AS HODOGRAPHS BECOME STRAIGHT...BUT INCREASING
WIND FIELDS ALOFT COULD COMBINE WITH ORGANIZED LINES/BOWS TO PRODUCE
WIND DAMAGE.
..JEWELL.. 01/17/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...KEY...
LAT...LON 25858179 26418000 25528012 25028034 24518121 24418193
24688184 24888140 25078124 25368125 25648138 25858179SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 17, 10:17 AM EST | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 15 more | 118 min |
| Jan 17, 11:33 AM EST | Tornado Watch | SPC | Broward, Miami-Dade, Monroe, Palm Beach | 7 hr |
| Jan 17, 11:54 AM EST | Tornado Watch | SPC | Brevard, Charlotte, DeSoto, Hardee, Highlands, Indian River and 9 more | 5 hr |
| Jan 17, 6:27 PM EST | Mesoscale Discussion | SPC | Miami-Dade | 63 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.