Alert archive / Florida / Mesoscale Discussions in 2016

Mesoscale Discussion 332

April 2, 20164 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2016, 2:19 AM EDT for 4 counties in Florida. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2016, 2:19 AM EDT (06:19 UTC)
Expired
Apr 2, 2016, 3:15 AM EDT
In force
56 min
Issued by
the Storm Prediction Center

Counties Dixie County, FL, Gilchrist County, FL, Lafayette County, FL, Taylor County, FL

The radar

The Tallahassee radar (KTLH), 99 km from the middle of the area, began a volume at 06:21 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 00:00Z, 6.3 hours before the alert went out and 197 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 00:00Z on 2016-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1190 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 00:00Z on 2016-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.1939587897Sfc1 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
1190 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.5

Open this sounding in Storm Lab

The text

As transmitted.

708 
ACUS11 KWNS 020620
SWOMCD
SPC MCD 020619 
FLZ000-020715-

MESOSCALE DISCUSSION 0332
NWS STORM PREDICTION CENTER NORMAN OK
0119 AM CDT SAT APR 02 2016

AREAS AFFECTED...FL BIG BEND AND PARTS OF N FL

CONCERNING...TORNADO WATCH 76...

VALID 020619Z - 020715Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 76 CONTINUES.

SUMMARY...THE REMAINING STRONG TO PERHAPS LOW-SEVERE RISK IS
GREATEST IN THE IMMEDIATE FL BIG BEND VICINITY THROUGH TORNADO WATCH
76 EXPIRATION TIME OF 08Z.  WHILE IT APPEARS UNLIKELY AN ADDITIONAL
WATCH WILL BE NEEDED...CONVECTIVE TRENDS WILL BE MONITORED OVER THE
NEXT SEVERAL HOURS AND WILL LIKELY DICTATE WHETHER A NEW WATCH WILL
BE NEEDED LATER TONIGHT.

DISCUSSION...RADAR IMAGERY OVER THE PAST HOUR HAS SHOWN A
SWD-SAGGING OUTFLOW BOUNDARY OVER THE FL BIG BEND WITH A STRONGER
UPDRAFT INTERSECTING THE BOUNDARY OVER APALACHEE BAY.  WEAK ROTATION
WAS OBSERVED FROM KTLH WITH THIS STORM WHEREAS THE REMAINING PORTION
OF THE LARGER-SCALE MCS EXTENDING FROM THE FL BIG BEND NEWD INTO
SERN GA EXHIBITS A COLD-POOL DOMINATED PARALLEL-STRATIFORM
CHARACTER.  EXPECTING LITTLE FLUCTUATION IN SURFACE TEMP/DEWPOINTS
TONIGHT AS CONDITIONS WILL GENERALLY HOLD FROM THE 68-72 RANGE N OF
THE OUTFLOW BOUNDARY AND MID 70S DEG F TEMPS S OF THE BOUNDARY.  AS
A RESULT...CONDITIONS IN THE BOUNDARY LAYER WILL REMAIN MARGINAL BUT
NOT PROHIBITIVE OF STRONGER WINDS PERHAPS REACHING THE SURFACE FROM
ANY MODESTLY-ORGANIZED CONVECTIVE STRUCTURE /I.E. TRANSIENT ROTATION
OR BOWING SEGMENT/.  NONETHELESS...STRONG WIND FIELDS COUPLED WITH A
MOIST BOUNDARY LAYER WILL SUPPORT THE CONTINUATION OF A
LOW-CONDITIONAL RISK FOR STRONG TO PERHAPS DAMAGING GUSTS.

..SMITH.. 04/02/2016

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

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

LAT...LON   29898436 30168280 29568271 29438367 29898436

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 9:02 PM EDTTornado WatchSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 21 more9 hr
Apr 1, 11:39 PM EDTMesoscale DiscussionSPCBaker, Bradford, Columbia, Franklin, Hamilton, Jefferson and 7 more66 min
Apr 2, 4:18 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more117 min
Apr 2, 6:00 AM EDTSevere Thunderstorm WatchSPCAlachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 12 more7 hr
Apr 2, 8:42 AM EDTMesoscale DiscussionSPCHernando, Pasco, Pinellas93 min
Apr 2, 12:01 PM EDTMesoscale DiscussionSPCHernando, Lake, Orange, Pasco, Seminole, Sumter and 1 more59 min

Nearby

Mesoscale Discussions in Florida, 2016Every mesoscale discussion in 2016

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.