000
FXUS63 KUNR 240327
AFDUNR

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
927 PM MDT THU MAY 23 2013

.UPDATE...
ISSUED AT 925 PM MDT THU MAY 23 2013

UPPER LEVEL RIDGE IS CRESTING OVER FORECAST AREA...WITH AREA OF
THICKER CLOUDS MOVING EAST AND SW FLOW INCREASING ALOFT. A STRONG
PRESSURE GRADIENT REMAINS OVER NORTHEASTERN WY WITH GUSTS STILL
>60 MPH OVER CAMPBELL CO. PRESSURE GRADIENT TIGHTENS OVER THE
NORTHERN HILLS TONIGHT...WITH S-SW WINDS OVER 60 MPH INCREASING
BELOW THE INVERSION. A 73 MPH GUST ALREADY REPORTED S OF SUNDANCE.
WINDS HAVE DIMINISHED OVER NORTHWESTERN SD...SO WILL CANCEL THE
WIND ADVISORY.

ACROSS SOUTHWESTERN-SOUTH CENTRAL SOUTH DAKOTA...LOW LEVEL JET...CAPE
AND THETA-E ADVECTION WILL INCREASE TONIGHT AHEAD OF THE SFC TROF WITH
SHOWERS AND THUNDERSTORMS POSSIBLE IN THIS AREA AFTER MIDNIGHT.

&&

.AVIATION...FOR THE 00Z TAFS THROUGH 00Z FRIDAY EVENING
ISSUED AT 530 PM MDT THU MAY 23 2013

STRONG PRESSURE GRADIENT WILL PERSIST ACROSS FORECAST AREA THROUGH
FRI MORNING WITH STRONG S-SE WINDS. GUSTS TO 50KT POSSIBLE OVR
NERN WY OVERNIGHT...AND HIGH WINDS WL DVLP OVR NORTHERN BLACK
HILLS AND NORTHERN FOOTHILLS THIS EVENING. LOW LVL WIND SHEAR
WILL LIKELY DEVELOP TONIGHT AT KRAP AS SFC WINDS DECOUPLE AND
WINDS ABV THE GROUND CONT AROUND 45KTS. WINDS WL DCRS AND SWITCH
TO THE NW-N FRI AFTN AS SFC TROF CROSSES THE AREA. MVFR CIGS WL
DEVELOP OVERNIGHT ACROSS WRN SD PLAINS AS MSTR IS TRANSPORTED NWD
ALG LOW LVL JET.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...HIGH WIND WARNING UNTIL 7 AM MDT FRIDAY FOR SDZ024-025-072.

     WIND ADVISORY UNTIL 7 AM MDT FRIDAY FOR SDZ001-002-012>014-026-
     031-073.

     WIND ADVISORY UNTIL 9 PM MDT THIS EVENING FOR SDZ025-072.

WY...HIGH WIND WARNING UNTIL 7 AM MDT FRIDAY FOR WYZ057.

     HIGH WIND WARNING UNTIL 3 AM MDT FRIDAY FOR WYZ054>056-058.

&&

$$

UPDATE...55
AVIATION...55