Spot Forecast Issued by NWS La Crosse, WI
000
FNUS73 KARX 211250
FWSARX
Spot Forecast for Grannis Creek...Iowa DNR
National Weather Service La Crosse WI
750 AM CDT Thu Mar 21 2024
Forecast is based on ignition time of 0800 CDT on March 21.
If conditions become unrepresentative...contact the National Weather
Service.
Please contact our office at (608) 784-8292 if you have questions
or concerns with this forecast.
.DISCUSSION...
Today remains to be the driest day in the forecast period with
low relative humidities around 30 to 35%. Winds remain light 5 to
10 mph however there will be variable conditions due to local
terrain. Smoke disperal will be fair today and poor tonight.
Fire weather conditions improve tonight into Friday as a storm
system moves into the area and brings wetting precipitation. The
active weather pattern is expected to continue into early next
week as another storm looks to move into the region on Sunday.
.REST OF TODAY...
Sky/weather.........Mostly cloudy (80-90 percent).
CWR.................10 percent.
Temperature.........26 at ignition...Max 39.
RH..................40 percent at ignition...Min 32 percent.
Wind (20 ft)........Winds east at 4 mph at ignition...otherwise
Light winds becoming east 5 to 6 mph in the
late morning and afternoon.
Mixing height.......1400 ft AGL at ignition...otherwise 3600 ft
AGL.
Transport winds.....East 6 to 9 mph shifting to the southeast 6 to
7 mph late in the afternoon.
Smoke dispersal.....Poor /11400 knot-ft/ at ignition. Max...fair
/21800 knot-ft/.
Haines Index........4 or low potential for large plume dominated
fire growth at ignition...max 4.
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........87 82 90 90 92 89 89 88 88 87
Weather cov.....
Weather type....
Tstm cov........
CWR.............10 10 10 10 10 10 10 10 10 10
Temp............26 26 28 31 33 34 35 37 37 38
RH..............40 40 37 32 33 33 33 32 33 35
20 FT wind dir..E E E E E E E E E E
20 FT wind spd..4 5 5 5 5 5 5 6 5 6
20 FT wind gust.6 7 7 6 6 6 6 7 7 8
Mix hgt (kft)...1.4 2.3 3.0 3.3 3.6 3.6 3.4 3.3 3.3 3.3
Transp wind dir.E E E E E SE SE SE SE SE
Transp wind spd.9 8 8 6 7 7 6 7 7 7
Haines index....4 4 4 4 4 3 3 3 3 3
SDspl kt-ft/100011 16 21 16 21 22 17 20 20 20
.TONIGHT...
Sky/weather.........Cloudy (90-100 percent). Chance of snow in the
evening, then snow, slight chance of freezing
rain and light sleet overnight.
CWR.................10 percent increasing to 20 percent late in the
evening, then decreasing to 10 percent late in
the evening increasing to 30 percent late in
the evening increasing to 40 percent increasing
to 60 percent overnight decreasing to 50
percent increasing to 70 percent after 3 am
increasing to 80 percent increasing to 100
percent early in the morning.
Temperature.........Min 28.
RH..................Max 88 percent.
Wind (20 ft)........East winds 7 to 9 mph.
Mixing height.......500 ft AGL.
Transport winds.....East 8 to 17 mph.
Smoke dispersal.....Fair (20300 knot-ft) early in the evening
decreasing to poor (4200 knot-ft) late in the
night.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
Sky (%).........89 92 96 97 98 97
Weather cov..... CHANCE CHANCE DEFNTE
Weather type....NONE NONE NONE SNOW SNOW SNOW
Tstm cov........
CWR.............10 10 10 40 50 80
Temp............39 35 32 32 31 30
RH..............32 45 58 66 75 85
20 ft wind......E 7 E 8 E 9 E 9 E 9 E 9
20 ft wind gust.9 12 14 15 14 15
Mix hgt (ft)....2900 500 500 900 800 1200
Transport wind..E 8 E 10 E 13 SE 14 E 14 E 16
Haines index....3 3 3 3 2 2
SDspl kt-ft/100020 4 6 11 10 17
.FRIDAY...
Sky/weather.........Cloudy (85-95 percent). Snow and slight chance
of thunderstorms in the morning, then slight
chance of snow in the afternoon.
CWR.................100 percent decreasing to 10 percent.
Temperature.........Max 37.
RH..................Min 75 percent.
Wind (20 ft)........East winds 8 to 9 mph with gusts to around 19
mph shifting to the north 11 to 12 mph late in
the afternoon. Gusty and erratic winds expected
near thunderstorms early in the morning.
Mixing height.......2600 ft AGL.
Transport winds.....East 9 to 17 mph shifting to the north 12 to 21
mph early in the afternoon, then increasing to
21 to 22 mph late in the afternoon.
Smoke dispersal.....Poor (11000 knot-ft) early in the morning
increasing to good (50000 knot-ft) in the
afternoon.
Haines Index........2 or very low potential for large plume
dominated fire growth.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
Sky (%).........99 100 98 90 91 85
Weather cov.....DEFNTE DEFNTE LIKELY S CHC
Weather type....SNOW SNOW SNOW SNOW NONE NONE
Tstm cov........ S CHC
CWR.............100 100 60 20 10 0
Temp............30 28 31 34 35 37
RH..............92 100 100 89 85 75
20 ft wind......E 9 E 9 E 9 NE 8 N 10 N 12
20 ft wind gust.15 18 12 11 15 19
Mix hgt (ft)....1100 1100 1200 1800 2100 2600
Transport wind..E 16 E 17 E 13 N 12 N 21 N 22
Haines index....2 2 2 2 2 2
SDspl kt-ft/100015 16 13 18 39 50
$$
Forecaster...CZ
Requested by...Trent Stuchel
Type of request...PRESCRIBED
.TAG 2408070.0/ARX
.DELDT 03/21/24
.FormatterVersion 2.0.0
.EMAIL trent.stuchel@dnr.iowa.gov