Mesoscale Discussion 637

Issued

Apr 30, 2012, 6:55 PM CDT (23:55 UTC)

Expired

Apr 30, 2012, 9:00 PM CDT

In force

2 hr

Issued by

the Storm Prediction Center

The Wichita radar (KICT), 55 km from the middle of the area, began a volume at 23:57 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.

• Tornado Watch 214Apr 30, 7:30 PM CDT
• Tornado Watch 215Apr 30, 9:50 PM CDT

316 
ACUS11 KWNS 302356
SWOMCD
SPC MCD 302355
MOZ000-OKZ000-KSZ000-010200-

MESOSCALE DISCUSSION 0637
NWS STORM PREDICTION CENTER NORMAN OK
0655 PM CDT MON APR 30 2012

AREAS AFFECTED...PORTIONS NRN OK...SRN KS...SWRN MO.

CONCERNING...TORNADO WATCH 212...

VALID 302355Z - 010200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 212 CONTINUES.

RAPID DEVELOPMENT/GROWTH OF SUPERCELLS HAS OCCURRED INVOF WARM
FRONTAL ZONE OVER SWRN KS AND EXTREME NWRN OK...WITH FIVE
WELL-DEFINED SRM COUPLETS EVIDENT OVER PORTIONS OF
COMANCHE/BARBER/KIOWA/EDWARDS COUNTIES KS AS OF 2345Z.  TORNADO
POTENTIAL WILL CONTINUE WITH THIS ACTIVITY EWD ACROSS CORRIDOR FROM
PAWNEE/STAFFORD COUNTIES KS TO WOODS/ALFALFA COUNTIES OK...IN
HELICITY/VORTICITY-RICH ENVIRONMENT OF WARM-FRONTAL ZONE.

SFC MESOANALYSIS SHOWED WARM FRONT FROM EXTREME NERN OK
WNWWD...PASSING OBLIQUELY ACROSS KS/OK BORDER INVOF I-35 TO NW
P28...WHERE IT BECOMES LOST IN GROWING AREA OF SVR TSTMS.  WARM
FRONT SHOULD CONTINUE DRIFTING NWD OVER MORE OF EXTREME SRN KS.
SUPERCELL THREAT MAY EXTEND JUST E OF WW ACROSS PORTIONS S-CENTRAL
KS AND N-CENTRAL OK...WITH LARGE/DAMAGING HAIL AND A FEW TORNADOES
POSSIBLE THROUGH EARLY EVENING.  MAIN THREAT MAY TRANSITION TO
DAMAGING WIND.  DEVELOPMENT OF ORGANIZED MCS WITH SUBSTANTIAL BOWING
CHARACTERISTICS AND SVR WIND SWATH APPEARS INCREASINGLY PROBABLE AS
SUPERCELLS AGGREGATE TOGETHER OVER SRN KS.  ANY SUCH COMPLEX WOULD
MOVE EWD TO ESEWD...FOLLOWING INSTABILITY GRADIENT ACCOMPANYING
WARM-FRONTAL ZONE...AND ENHANCED BY NEARLY ORTHOGONAL COMPONENT OF
MIDLEVEL WINDS AND DEEP-SHEAR VECTORS ALOFT WITH RESPECT TO LIKELY
CONVECTIVE ALIGNMENT.  MOISTURE CHANNEL IMAGERY INDICATES MINOR BUT
POTENTIALLY INFLUENTIAL UPPER-LEVEL PERTURBATION MOVING EWD ACROSS
CAO/SPD AREA...WHICH SHOULD TRACK ENEWD ACROSS SWRN KS IN IMMEDIATE
WAKE OF SWRN KS/NWRN OK CONVECTION.  IN LOW LEVELS...FAVORABLE WAA
AND MOISTURE TRANSPORT WILL ACCOMPANY INCREASING LLJ AFTER
00Z...ENLARGING HODOGRAPHS AND ALSO BOOSTING STORM-RELATIVE INFLOW
ATOP BOUNDARY LAYER.

..EDWARDS.. 04/30/2012

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

ATTN...WFO...SGF...EAX...TSA...TOP...ICT...OUN...DDC...

LAT...LON   36349813 36609879 37339978 38029981 38419845 38179485
            37709415 36479467 36259668 36349813

Mesoscale Discussions in Kansas, 2012Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Missouri, 2012Every mesoscale discussion in 2012

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.