SWODY1
SPC AC 210537
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1237 AM CDT FRI MAR 21 2008
VALID 211200Z - 221200Z
..NO SVR TSTM AREAS FORECAST...
..MIDWEST/OH VLY...
A MID-LVL IMPULSE OVER THE NRN/CNTRL PLAINS EARLY FRI WILL QUICKLY
TRANSLATE EWD INTO THE MIDWEST/OH VLY BY FRI EVE. ASSOCD SFC LOW
ALONG THE MO/IA BORDER AT 12Z FRI WILL DEVELOP EWD INTO SRN OH BY
LATE FRI NIGHT ALONG A STRENGTHENING BAROCLINIC ZONE. A NEW COLD
FRONT WILL SWEEP SEWD ACROSS THE LWR OH VLY AND PLAINS STATES
THROUGH THE PD.
A VERY NARROW BAND OF MODIFIED GULF MSTR WILL ADVECT NEWD FROM THE
SRN PLAINS NEWD INTO THE MIDWEST THROUGH FRI AFTN BENEATH A STEEP
MID-LVL LAPSE RATE PLUME EMANATING FROM THE HIGH PLAINS. THIS WILL
LIKELY RESULT IN A CAPPED ENVIRONMENT ACROSS MOST OF THE MIDWEST/OH
VLY PRECLUDING SFC-BASED TSTM DEVELOPMENT ALONG THE APCHG COLD
FRONT. MORE LIKELY SCENARIO WILL BE FOR ELEVATED TSTMS ALONG/N OF
THE TRACK OF THE SFC LOW...NAMELY ALONG/N OF INTERSTATE-70. THOUGH
LAPSE RATES WILL BE STEEP/MID-TROPOSPHERIC TEMPERATURES COLD...
LIMITED MSTR/MUCAPE WILL MITIGATE SVR WEATHER CONCERNS.
..NRN HIGH PLAINS...
MID-LVL SPEED MAX ARRIVING ON THE PAC NW CST FRI MORNING WILL SPREAD
DOWNSTREAM INTO THE NRN HIGH PLAINS FRI AFTN. ALREADY PRESENT STEEP
LAPSE RATES IN THE LOW-MID TROPOSPHERE WILL COMBINE WITH SUFFICIENT
MOISTENING OF THE MID-LVLS AND WEAK LARGER SCALE ASCENT FOR ANOTHER
ROUND OF SPORADIC AFTN/EVE HIGH-BASED TSTMS ACROSS THE NRN HIGH
PLAINS. SOME OF THIS ACTIVITY WILL SPREAD INTO THE WRN DAKS AND
NWRN NEB DURING THE EVE. MARGINALITY OF THE MOISTURE/THERMAL
BUOYANCY WILL KEEP THE SVR THREAT VERY LOW/NIL.
.RACY/JEWELL.. 03/21/2008
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