FNUS73 KFSD 041324 FWSFSD SPOT FORECAST FOR SANTEE WALLACE WMA...IOWA DNR NATIONAL WEATHER SERVICE SIOUX FALLS SD 824 AM CDT WED APR 4 2012 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... SURFACE HIGH PRESSURE WILL MOVE EASTWARD ACROSS ONTARIO TODAY AND TONIGHT...WHILE AN UPPER LEVEL LOW MOVES THROUGH THE SOUTHERN PLAINS. THERE MAY BE A VERY LIGHT SHOWER OR TWO THAT COULD MAKE IT AS FAR NORTH AS SIOUX CITY THIS AFTERNOON AND EVENING. BUT OTHERWISE THIS AREA WILL BE DRY AS A LOW LEVEL FETCH OF DRY AIR COMES IN FROM THE EAST. 60S WILL BE WIDESPREAD TODAY THROUGH THURSDAY FOR HIGHS WHICH IS STILL ABOVE NORMAL. MIXING POTENTIAL WILL BE FAIRLY STRONG BOTH TODAY AND THURSDAY. HOWEVER THE WINDS ALOFT ARE NOT REAL STRONG... THEREFORE THE GRASSLAND FIRE DANGER INDEX WILL BE BELOW THE VERY HIGH CATEGORY BOTH TODAY AND THURSDAY. ON FRIDAY...THE WINDS PICK UP FROM THE SOUTH TO SOUTHEAST. THEREFORE THE GRASSLAND FIRE DANGER INDEX MAY REACH THE VERY HIGH CATEGORY. A FRONTAL BOUNDARY AND ASSOCIATED UPPER TROUGH WILL THEN MOVE RAPIDLY ACROSS THIS AREA FRIDAY NIGHT WHICH SHOULD PRODUCE SOME DECENT CHANCES FOR RAIN AND EMBEDDED THUNDERSTORMS. BRISK WEST TO NORTHWEST WINDS WILL THEN FOLLOW ON SATURDAY WITH COOLER TEMPERATURES...PRETTY CLOSE TO NORMAL. WINDS WILL CONTINUE TO BE BREEZY ON SUNDAY AND MONDAY AS COOL AIR DRAINS DOWN FROM THE NORTH. THERE IS CONSENSUS AMONGST THE VARIOUS MODELS THAT A FROST OR FREEZE COULD OCCUR NEXT EARLY TUESDAY ALONG AND EAST OF THE JAMES RIVER VALLEY. THE WEATHER PATTERN THEN LOOKS RAINY LATER NEXT WEEK. .TODAY... MAX TEMPERATURE.....62-67. MIN HUMIDITY........24 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY COVER.......PC PC PC PC PC PC PC PC PC PC MC MC % SKY COVER.....49 48 47 46 45 44 43 45 48 50 53 56 WEATHER COV..... WEATHER TYPE.... TEMP............46 47 50 53 56 58 61 63 65 65 65 63 RH..............51 49 46 41 37 34 31 27 25 24 25 27 DEWPOINT........29 29 30 30 30 30 30 29 28 27 28 29 20 FT WIND DIR..NE NE ENE ENE ENE ENE E E E E E E 20 FT WIND SPD..9 10 10 12 13 13 14 15 15 15 14 13 20 FT WIND GUST.10 15 15 15 15 20 20 20 20 20 15 SMOKE DISPERSAL.PR PR FR FR GD GD GD EX EX EX EX EX CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10 MIX HGT (KFT)...0.3 0.6 1.0 1.4 2.2 2.9 3.6 4.1 4.6 5.1 5.0 4.8 TRANSP WIND DIR.NE ENE ENE E E E E E E E E E TRANSP WIND SPD.7 14 21 24 24 23 21 20 20 20 20 20 HAINES INDEX....4 4 4 4 4 4 4 4 5 5 5 5 WEATHER TYPE ABBREVIATIONS 1) T = THUNDERSTORMS 2) R = RAIN 3) RW = RAIN SHOWERS 4) L = DRIZZLE 5) ZR = FREEZING RAIN 6) ZL = FREEZING DRIZZLE 7) S = SNOW 8) SW = SNOW SHOWERS 9) IP = ICE PELLETS 10) F = FOG 11) ZF = FREEZING FOG 12) IC = ICE CRYSTALS 13) H = HAZE 14) BS = BLOWING SNOW 15) K = SMOKE 16) BD = BLOWING DUST 17) FR = FROST $$ FORECASTER...WEISSER REQUESTED BY...RORY MARTINSON TYPE OF REQUEST...PRESCRIBED .TAG 20120404.SANTE.01/FSD