Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 2137

September 5, 20117 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2011, 6:24 PM EDT for 7 counties in Florida. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Sep 5, 2011, 6:24 PM EDT (22:24 UTC)
Expired
Sep 5, 2011, 7:30 PM EDT
In force
66 min
Issued by
the Storm Prediction Center

Counties Alachua County, FL, Baker County, FL, Columbia County, FL, Gilchrist County, FL, Hamilton County, FL, Levy County, FL, Union County, FL

The radar

The Jacksonville radar (KJAX), 108 km from the middle of the area, began a volume at 22:24 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

Jacksonville, FL (KJAX), launched 12:00Z, 10.4 hours before the alert went out and 109 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.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2011-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1299 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2011-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1299 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

142 
ACUS11 KWNS 052225
SWOMCD
SPC MCD 052224
FLZ000-GAZ000-052330-

MESOSCALE DISCUSSION 2137
NWS STORM PREDICTION CENTER NORMAN OK
0524 PM CDT MON SEP 05 2011

AREAS AFFECTED...NRN FL

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 052224Z - 052330Z

A LIMITED TEMPORAL/AREAL THREAT OF DMGG WINDS AND/OR AN ISOLATED
TORNADO EXISTS FOR PARTS OF NRN FL. IT IS UNCLEAR WHETHER A WW WILL
BE NECESSARY GIVEN THESE LIMITATIONS.

DEEP-LAYER FLOW HAS INCREASED ACROSS THE SOUTHEAST ATTENDANT TO THE
REMNANTS OF T.D. LEE AND AN UPPER TROUGH FARTHER NORTH. 18Z TLH
SOUNDING REFLECTS DEEP SLY WIND FIELDS...WITH SUFFICIENT BOUNDARY
LAYER MIXING TO CONTRIBUTE TO A DMGG WIND THREAT AS SLY WINDS REMAIN
NEAR 30 TO 35 KT AT 1 KM PER AREA VAD WIND PROFILE DATA. SMALL
BOWING SEGMENTS AND OCCASIONAL LOW-LEVEL ROTATION WILL BE POSSIBLE
IN STRONGER STORMS THAT CAN DEVELOP. HOWEVER...DRIER LOW LEVELS
FARTHER E TOWARD THE ATLANTIC COAST AND LINGERING CONVECTIVE
INHIBITION /DESPITE TEMPERATURES IN THE MID TO UPPER 80S F/ WILL
LIKELY LIMIT THE POSSIBILITY OF NEW SURFACE-BASED CONVECTION...AND
THE ASSOCIATED THREAT OF DMGG WINDS.

..HURLBUT.. 09/05/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...TBW...JAX...TAE...

LAT...LON   30298212 29328230 28958255 29018286 29268296 29828291
            30568297 30628260 30538227 30298212

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 4, 10:42 PM EDTTornado WatchSPCEscambia, Okaloosa, Santa Rosa9 hr
Sep 5, 12:35 AM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa115 min
Sep 5, 5:26 AM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more94 min
Sep 5, 6:35 AM EDTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more10 hr
Sep 5, 12:01 PM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more29 min
Sep 5, 4:04 PM EDTSevere Thunderstorm WatchSPCBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more6 hr
Sep 5, 4:15 PM EDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 9 more30 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.