Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS11 KWNS 240152
SWOMCD
SPC MCD 240152
MTZ000-240345-

MESOSCALE DISCUSSION 1452
NWS STORM PREDICTION CENTER NORMAN OK
0852 PM CDT WED JUL 23 2014

AREAS AFFECTED...CNTRL AND NRN MT

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 240152Z - 240345Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...A SEVERE THREAT APPEARS LIKELY TO DEVELOP ACROSS NRN AND
CNTRL MT LATER THIS EVENING. WIND DAMAGE AND HAIL WILL BE THE
PRIMARY THREATS. WW ISSUANCE MAY BE NEEDED AS STORM COVERAGE
INCREASES.

DISCUSSION...THE LATEST SFC ANALYSIS SHOWS A 1006 MB LOW IN FAR WRN
MT WITH EASTERLY FLOW IN PLACE ACROSS MUCH OF CNTRL AND ERN MT. A
CORRIDOR OF LOW-LEVEL MOISTURE IS IN PLACE ACROSS NERN MT WHERE SFC
DEWPOINTS ARE IN THE LOWER TO MID 60S F AND MODERATE INSTABILITY IS
ALREADY IN PLACE. THUNDERSTORMS ARE DEVELOPING UPSTREAM FROM THE
AXIS OF MODERATE INSTABILITY...JUST TO THE NORTHEAST OF THE
CONTINENTAL DIVIDE NEAR HELENA MT. THUNDERSTORMS ARE ALSO INITIATING
TO THE WEST OF GLASGOW MT. THE ACTIVITY NEAR THE CONTINENTAL DIVIDE
SHOULD EXPAND IN COVERAGE AND MOVE INTO THE MCD AREA OVER THE NEXT
HOUR. AS THIS CONVECTION ENCOUNTERS MODERATE INSTABILITY...SEVERE
THUNDERSTORM DEVELOPMENT MAY OCCUR. OTHER STORMS SHOULD INITIATE
NEAR THE INSTABILITY AXIS IN NE MT. THE THERMODYNAMIC ENVIRONMENT
ALONG WITH DEEP-LAYER SHEAR ON THE ORDER OF 50 TO 60 KT SHOULD BE
SUPPORTIVE OF SUPERCELLS AND ISOLATED LARGE HAIL. WIND DAMAGE WILL
ALSO BE POSSIBLE AS THE CELLS MATURE LATER ON THIS EVENING.
SHORT-TERM MODELS FORECAST INDICATE THAT A CLUSTER OF STRONG TO
SEVERE STORMS WILL ORGANIZE AND MOVE NEWD ACROSS NRN MT LATE THIS
EVENING SUGGESTING WW ISSUANCE MAY BECOME NECESSARY.

..BROYLES/EDWARDS.. 07/24/2014

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

ATTN...WFO...BYZ...GGW...TFX...

LAT...LON   48720706 48220535 47250500 46320547 45940898 46431121
            48581185 48890960 48720706



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