**18Z UPDATE**
18Z SOUNDINGS
DAVENPORT: http://i48.tinypic.com/53qxhg.gif
OMAHA: http://i46.tinypic.com/jsoo40.gif
RAPID CITY: http://i49.tinypic.com/1z21zl0.gif
NORTH PLATTE: http://i46.tinypic.com/iejgpt.gif
VISIBLE SATELLITE
MIDWEST: http://i48.tinypic.com/6fyx4h.jpg
N PLAINS: http://i47.tinypic.com/augoid.jpg
S PLAINS: http://i45.tinypic.com/2s84jgk.jpg
RADAR COMPOSITE
MIDWEST: http://i48.tinypic.com/2w7g8s1.gif
N PLAINS: http://i49.tinypic.com/64qhx0.gif
S PLAINS: http://i45.tinypic.com/r9ii2p.gif
UPPER MIDWEST: http://i50.tinypic.com/ra21cg.gif
SURFACE PLOTS
MIDWEST: http://i50.tinypic.com/dqobyt.jpg
N PLAINS: http://i47.tinypic.com/119xrmx.gif
S PLAINS: http://i50.tinypic.com/4r6xbm.jpg
UPPER MIDWEST: http://i49.tinypic.com/9zv8k4.gif
WIND PROFILER: http://i50.tinypic.com/dzfjpy.gif
SEVERE WEATHER UPDATE
RADAR IS SHOWING CELL INITIATION ACROSS WYOMING AS OF 18Z
WATCH BOX OVER CURRENT RADAR: http://i45.tinypic.com/27y2vci.jpg
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EXTREME SOUTH CENTRAL AND SOUTHEAST MONTANA
NORTHERN AND CENTRAL WYOMING
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL
800 PM MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
SOUTHWEST OF CODY WYOMING TO 70 MILES SOUTHEAST OF MOORCROFT
WYOMING. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW ...
DISCUSSION...SCATTERED STRONG/SEVERE STORMS CONTINUE TO DEVELOP
ACROSS PARTS OF CENTRAL AND EASTERN WY. THIS IS IN RESPONSE TO
MID/UPPER LEVEL LOW DEEPENING OVER SWRN WY WITH ASSOCIATED VORTICITY
MAX MOVING NEWD ACROSS NERN UT. 17Z RUC SOUNDINGS SHOW FAVORABLE
SHEAR PROFILE TO SUPPORT UPDRAFTS ALONG WITH STEEP LAPSE RATES ABOVE
8.5C/KM INDICATING MAIN THREAT ATTM BEING HAIL AND DOWNBURSTS.
MESOSCALE DISCUSSION
http://i47.tinypic.com/4zvrlh.gif
MESOSCALE DISCUSSION
NWS STORM PREDICTION CENTER NORMAN OK
AREAS AFFECTED...SRN/CENTRAL WI
CONCERNING...SEVERE THUNDERSTORM WATCH ...
VALID
SVR THREAT WILL CONTINUE OVER MUCH OF WW THROUGH 21Z.
AIRMASS DOWNSTREAM OF WEAKENING CONVECTIVE LINE OVER WRN WI REMAINS
MODERATELY UNSTABLE WITH MUCAPE VALUES AROUND 3000 J/KG. WEAKENING
INHIBITION IS EVIDENT BY RECENT TRENDS OF REDEVELOPMENT OF
STRONG/ISOLATED SVR STORMS ALONG GUST FRONT/OUTFLOW OVER CENTRAL WI.
WELL DEFINED CONVERGENCE ALONG THE OUTFLOW BOUNDARY SHOULD CONTINUE
TO SUPPORT MORE SVR TSTM DEVELOPMENT ALONG THIS BOUNDARY FROM SWRN
WI ENEWD INTO CENTRAL WI OVER THE NEXT FEW HOURS. GREATEST SVR HAIL
POTENTIAL WILL REMAIN OVER SWRN PORTIONS OF WW ...WHERE STEEPER
MID LEVEL LAPSE RATES AND STRONGER MID LVL FLOW/DEEP LAYER SHEAR
EXISTS. ALONG AND AHEAD OF CONVECTIVE OUTFLOW OVER CENTRAL/ERN
WI...FOCUSED LOW LEVEL CONVERGENCE/PRESSURE RISES IN THE WAKE OF
CONVECTIVE LINE AND SOMEWHAT WEAKER MID LEVEL WINDS WILL SUPPORT
DAMAGING WINDS AS THE PRIMARY THREAT.