Area Forecast Discussion
Issued by NWS Twin Cities, MN

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

000
FXUS63 KMPX 210906
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
406 AM CDT MON APR 21 2014

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 333 AM CDT MON APR 21 2014

MAIN CONCERN IN THE SHORT TERM IS THE CONVECTION CURRENTLY OCCURRING
ACROSS THE AREA... AND HOW IT WILL EVOLVE THROUGH THE MORNING HOURS.
LATEST SURFACE ANALYSIS SHOWS A TIGHT DEWPOINT GRADIENT FROM WEST
CENTRAL MINNESOTA THROUGH WEST CENTRAL WISCONSIN... ACTING AS A WARM
FRONT OF SORTS... WITH THE THERMAL GRADIENT A BIT FARTHER NORTH AND
ALSO TO THE WEST ALONG THE SURFACE TROUGH. SPC MESOANALYSIS MUCAPE
SHOWS VALUES OF 250-500 J/KG COINCIDENT WITH THE AREA OF ACTIVITY
CURRENTLY OVER THE AREA... LINING UP FAIRLY WELL WITH THE RAP
ANALYZED 850MB THETA-E RIDGE AHEAD OF THE SURFACE FRONT AND
SHORTWAVE APPARENT IN WATER VAPOR IMAGERY. THINGS ARE EXPECTED TO
CONTINUE TO SHIFT EAST THIS MORNING... WITH MOST OF THE ACTIVITY
EAST OF THE FORECAST AREA AFTER 15Z. HOWEVER... UNTIL THAT TIME WE
WILL SEE SOME LOCAL DOWNPOURS AND PEA-SIZED HAIL WITH THE STORMS
THAT ARE MOVING THROUGH THE AREA. BY 18Z WE SHOULD SEE CLEARING
QUICKLY WORKING ITS WAY FROM WEST TO EAST ACROSS THE FORECAST
AREA... WITH STRONG NORTHWEST WINDS... PARTICULARLY OVER WEST
CENTRAL AND SOUTH CENTRAL MINNESOTA. THE COMBINATION OF STRONG WINDS
AND RELATIVE HUMIDITY VALUES IN THE 20S THIS AFTERNOON WILL RESULT
IN ELEVATED FIRE DANGER POTENTIAL FOR FROM WEST CENTRAL INTO SOUTH
CENTRAL MINNESOTA... SO WILL CONTINUE THE FIRE WEATHER WATCH FOR
THAT AREA. HIGH PRESSURE WILL BUILD OVER THE REGION TONIGHT... WITH
WINDS QUICKLY DYING OFF DURING THE EVENING HOURS... AND COOLER
TEMPERATURES MOVING BACK INTO THE AREA... MAKING FOR LOWS IN THE 30S
AND PERHAPS BELOW FREEZING IN OUTLYING AREA.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 333 AM CDT MON APR 21 2014

TRENDS IN THE LONG TERM CONTINUE TO INDICATE A FAIRLY ACTIVE
MIDWEEK...FOLLOWED BY A COOLING TRNED THAT WILL LAST THROUGH NEXT
WEEKEND.

HIGH PRESSURE BEGINS THE LONG TERM FOR TUESDAY. IT SHOULD BE A
RATHER PLEASNT DAY WITH LIGHT WINDS...AND MILD TEMPERATURES.

THE NEXT WESTERN CONUS TROUGH DIGS SOUTHEAST AND BEGINS TO AFFECT
THE AREA LATE TUESDAY NIGHT. RETURN FLOW AND LLJ INTENSIFIES
OVER THE EASTERN DAKOTAS LATE TUESDAY NIGHT. THIS WILL DEVELOP AT
LEAST SOME WIDELY SCATTERED CONVECTION IN THE EASTERN
DAKOTAS...SPILLING EAST INTO WEST CENTRAL MN LATE. STEEPER LAPSE
RATES MOVE INTO THE WEST DURING THE DAY WEDNESDAY...WITH THE
THREAT OF ISOLATED CONVECTION EXPECTED. THE MORNING ACTIVITY WILL
SPREAD EAST INTO WESTERN WISCONSIN WITH REDEVELOPMENT AGAIN TO THE
WEST INTO THE AFTERNOON. THE BETTER INSTABILITY WORKS EAST WITH
TROUGH WEDNESDAY NIGHT INTO THURSDAY.  AREA OF STEEP LAPSE RATES
LIFT NORTH ACROSS AT LEAST THE SOUTHERN HALF OF THE AREA AHEAD OF
THE SURFACE LOW WHICH IS PROGGED TO MOVE SOUTH OF THE CWA...ALONG/NEAR
THE MN/IA BORDER. STILL SEE SOME ELEVATED HAIL POSSIBILITIES LATER
WEDNESDAY NIGHT AND THURSDAY MORNING.

MODEL DISCREPANCIES REMAIN AS TO HOW QUICKLY THE UPPER LOW MOVES
EAST OF THE AREA. THE 00Z ECMWF IS MOST PROGRESSIVE WITH THE SYSTEM
AND DROPS SOME COLDER AIR SOUTH OVER THE AREA INTO THE WEEKEND.
THE 00Z GFS IS SLOWER AND MUCH MORE AMPLIFIED WITH THE SYSTEM. IT
EVENTUALLY DROPS 85H TEMPERATURES CLOSE TO MINUS 12C ONCE AGAIN BY
SATURDAY MORNING. THIS MAY BE OVERDONE...BUT IT DOES APPEAR WELL
BELOW NORMAL TEMPERATURES ARE ONCE AGAIN IN STORE WELL INTO THE
WEEKEND.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z MONDAY NIGHT)
ISSUED AT 1112 PM CDT SUN APR 20 2014

CONFIDENCE IS FAIRLY HIGH IN THE TIMING OF THE COLD FRONT WHICH
WILL CAUSE THE WINDS TO SHIFT OUT OF THE NORTHWEST. CONFIDENCE IS
LESS IN THE DEVELOPMENT OF PRECIP OVERNIGHT...ALONG WITH FOG.
BASED OF THE HIRES MODELS AND CURRENT CONDITIONS FEEL THAT
KRWF...KEAU...AND KMSP HAVE THE BEST CHANCE FOR PRECIP...WHILE THE
HIGHEST FOG POTENTIAL IS KEAU AND KRNH. ON MONDAY NORTHWEST WINDS
WILL GUST NEAR 25KTS.

KMSP...
A FEW LIGHT SHOWERS ARE DEVELOPING WEST OF THE AIRFIELD...SO HAVE
VCSH DURING MOST OF THE OVERNIGHT HOURS...WITH A TEMPO SHOWER
GROUP CENTERED AROUND THE HIGHEST PROBABILITY FOR MEASURABLE
PRECIP. THUNDER IS NOT OUT OF THE QUESTION...BUT THE CONFIDENCE IS
TOO LOW TO INCLUDE IN THE TAFS.

/OUTLOOK FOR KMSP/
TUE...VFR. WINDS NW AT 5-10KTS.
WED...MVFR WITH IFR/RA AND TSRA POSSIBLE. WIND SE AT 15G20KTS.
THU...MVFR WITH IFR/RA AND TSRA POSSIBLE. WIND WSW AT 20G30KTS.


&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...RED FLAG WARNING FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS
     EVENING FOR MNZ047-054>056-064-065-073>075-082-083-091-092.

WI...NONE.
&&

$$

SHORT TERM...TRH
LONG TERM...DWE
AVIATION...JRB






USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.