MESO: Mesoscale Discussion 1169

ACUS11 KWNS 171529
SWOMCD
SPC MCD 171529
KYZ000-TNZ000-INZ000-171630-

MESOSCALE DISCUSSION 1169
NWS STORM PREDICTION CENTER NORMAN OK
1029 AM CDT WED JUN 17 2009

AREAS AFFECTED...MIDDLE/ERN TN AND CENTRAL/ERN KY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 171529Z - 171630Z

TSTMS EXPECTED TO DEVELOP AND SLOWLY INCREASE IN COVERAGE/INTENSITY
ACROSS CENTRAL/ERN KY AND MIDDLE/ERN TN THIS MORNING INTO THE
AFTERNOON. HAIL AND STRONG WIND GUSTS WILL BE THE PRIMARY THREATS
WITH THE STRONGER STORMS...AND A WW IS POSSIBLE FOR THIS REGION.

15Z SURFACE ANALYSIS SHOWED AN AREA OF LOW PRESSURE OVER LOWER MI
WITH A WARM FRONT EXTENDING SEWD INTO ERN OH AND THEN SSWWD THROUGH
ERN KY/TN TO NWRN GA. A COUPLE OF WEAKER SURFACE BOUNDARIES...ALSO
DISCERNIBLE WITH VISIBLE SATELLITE IMAGERY...EXTENDED FROM NRN KY
WNWWD THROUGH SRN IL/CENTRAL MO...AND A SECOND BOUNDARY EXTENDED
GENERALLY WNWWD THEN SWWD ACROSS TN INTO NRN AR. THIS LATTER
BOUNDARY IS ATTENDANT TO A MID LEVEL IMPULSE TRACKING SEWD ACROSS
CENTRAL TN.

SURFACE TEMPERATURES RISING INTO THE 80S WITHIN A VERY MOIST AIR
MASS /SURFACE DEWPOINTS IN THE LOWER 70S/ ALONG AND WEST OF THE WARM
FRONT IS CONTRIBUTING TO MODERATE INSTABILITY ALREADY ACROSS THE
DISCUSSION AREA. TSTMS SHOULD DEVELOP AS INHIBITION CONTINUES TO
WEAKEN. FORCING FOR ASCENT WITH THE MID LEVEL IMPULSE TRACKING SEWD
ACROSS TN AND SRN EXTENT OF STRONGER FORCING ATTENDANT TO SRN GREAT
LAKES SHORT WAVE TROUGH WILL SUPPORT TSTM DEVELOPMENT ALONG THE
SURFACE BOUNDARIES. MODEST MID LEVEL LAPSE RATES /6.5-7 C/KM/ MAY
TEND TO INHIBIT MORE VIGOROUS UPDRAFTS...BUT EFFECTIVE BULK SHEAR
/35-40 KT/ WITHIN NWLY FLOW REGIME WILL SUPPORT STORM ORGANIZATION.
HAIL AND STRONG WIND GUSTS SHOULD BE THE PRIMARY THREAT WITH THE
STRONGEST STORMS.

..PETERS.. 06/17/2009

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

ATTN...WFO...RLX...MRX...JKL...ILN...LMK...OHX...HUN...PAH...
MEG...

LAT...LON 35048560 35028711 35128820 35948798 36878729 37878666
38518560 38738433 38388286 37908286 35598462 35198521
35048560

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