Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 451

April 16, 20119 counties in Florida; 16 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2011, 7:57 AM EDT for 9 counties in Florida; 16 counties in Georgia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2011, 7:57 AM EDT (11:57 UTC)
Expired
Apr 16, 2011, 9:00 AM EDT
In force
63 min
Issued by
the Storm Prediction Center
All 25 counties

Baker County, FL, Columbia County, FL, Hamilton County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 12.0 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.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.19395878Sfc1 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
149 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
987 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

567 
ACUS11 KWNS 161157
SWOMCD
SPC MCD 161157 
GAZ000-FLZ000-161300-

MESOSCALE DISCUSSION 0451
NWS STORM PREDICTION CENTER NORMAN OK
0657 AM CDT SAT APR 16 2011

AREAS AFFECTED...SRN GA...NRN FL

CONCERNING...TORNADO WATCH 148...

VALID 161157Z - 161300Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 148 CONTINUES.

IF CURRENT TRENDS CONTINUE...A NEW WW MAY NOT BE NEEDED PRIOR TO THE
SCHEDULED 14Z EXPIRATION OF WW 148.

ALTHOUGH SOME RECENT INTENSIFICATION HAS OCCURRED WITH THE STORM
NEAR VALDOSTA...THE GENERAL TREND SO FAR HAS BEEN FOR CONVECTION TO
WEAKEN AS IT SPREADS EAST OF THE WW AREA TOWARD ATLANTIC COASTAL
AREAS.  LOW-LEVEL STORM RELATIVE INFLOW EMANATING FROM A RESIDUAL
POCKET OF SLIGHTLY COOLER AND DRIER BOUNDARY LAYER AIR OVER INTERIOR
NORTHERN FLORIDA INTO SOUTHERN GEORGIA MAY BE RESPONSIBLE...AND IT
IS NOT CLEAR THAT SIGNIFICANT DESTABILIZATION WILL OCCUR PRIOR TO
THE ANTICIPATED VEERING AND WEAKENING OF LOW-LEVEL FLOW FIELDS
DURING THE MID TO LATE MORNING.

..KERR.. 04/16/2011

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

ATTN...WFO...CHS...JAX...TAE...

LAT...LON   31068339 31628254 32018165 31738126 30538163 30078206
            29818337 30118397 31068339

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 15, 8:16 PM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa59 min
Apr 15, 8:48 PM EDTTornado WatchSPCEscambia, Holmes, Okaloosa, Santa Rosa, Walton6 hr
Apr 15, 11:41 PM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa94 min
Apr 16, 3:05 AM EDTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 11 more7 hr
Apr 15, 8:52 PM EDTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Bleckley, Butts, Clarke and 40 more53 min
Apr 15, 9:12 PM EDTTornado WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 69 more9 hr
Apr 16, 2:43 AM EDTMesoscale DiscussionSPCBaker, Calhoun, Clay, Decatur, Dougherty, Early and 4 more92 min
Apr 16, 5:09 AM EDTMesoscale DiscussionSPCClarke, Columbia, Elbert, Franklin, Glascock, Greene and 12 more96 min
Apr 16, 5:57 AM EDTTornado WatchSPCBaldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 56 more8 hr
Apr 16, 10:39 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 12 more2 hr

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale 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.