Alert archive / Idaho / Areal Flood Advisories in 2012
Areal Flood Advisory 2, NWS Missoula, MT
NWS Missoula, MT issued this areal flood advisory at Mar 16, 2012, 2:45 PM PDT for Idaho County, Idaho. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Mar 16, 2012, 2:45 PM PDT (21:45 UTC)
- Expired
- Mar 16, 2012, 8:17 PM PDT
- In force
- 6 hr
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
County Idaho County, ID
The radar
The Missoula radar (KMSX), 175 km from the middle of the area, began a volume at 21:45 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 9.8 hours before the alert went out and 218 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 37 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 486 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- -16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this areal flood advisory went out at Mar 16, 1:55 PM PDT, 50 minutes earlier.
Area forecast discussion, Mar 16, 1:55 PM PDT, 50 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
255 PM MDT FRI MAR 16 2012
.DISCUSSION...ANOTHER WAVE OF SHOWERS WILL MOVE ACROSS THE
REGION THIS AFTERNOON BEFORE AN EVENING OF MORE MILD...IF STILL
WET WEATHER TONIGHT. EXPECT RAIN SHOWERS IN THE VALLEYS WITH
INTERMITTENT SNOW SHOWERS IMPACTING TRAVEL OVER THE PASSES
TONIGHT.
A SIGNIFICANT WEATHER DISTURBANCE AND SURFACE LOW PRESSURE SYSTEM WILL
MOVE NORTHEASTWARD ACROSS WESTERN MONTANA AND NORTH CENTRAL IDAHO
SATURDAY. THIS WEATHER SYSTEM WILL PRODUCE AREAS OF MODERATE TO
HEAVY PRECIPITATION...ESPECIALLY FROM ABOUT MISSOULA SOUTH AND
EASTWARD. THE AIR MASS SHOULD MODERATE ENOUGH IN ADVANCE OF
WEATHER DISTURBANCE TO TEMPORARILY RAISE SNOW LEVELS ABOVE VALLEY
FLOORS SATURDAY. HOWEVER...COOLER AIR SHOULD SURGE ACROSS THE
REGION BEHIND THIS WAVE LATE SATURDAY AND SATURDAY NIGHT RESULTING
IN THE PRECIPITATION TRANSITIONING BACK TO SNOW MANY VALLEY
AREAS. YET ANOTHER WAVE OF ENERGY AND MOISTURE MAY SHIFT
NORTHEASTWARD ACROSS WESTERN MONTANA SUNDAY...BUT THE MAIN
DIFFERENCE IS THE AIR MASS SHOULD BE COOLER. WE HAVE ISSUED
HEADLINES FOR SOME SOUTHWEST MONTANA AND LEMHI COUNTY MOUNTAINOUS
AREAS FOR SIGNIFICANT SNOW THROUGH THE WEEKEND. VALLEYS ROAD
CONDITIONS WILL BE QUITE VARIABLE AND POSSIBLY BECOMING LOCALLY
SLICK SATURDAY NIGHT INTO SUNDAY.
MONDAY THROUGH FRIDAY...MODELS AGREE THAT THE WEATHER WILL REMAIN
UNSETTLED THROUGH NEXT WEEK. TIMING OF INDIVIDUAL WAVES MOVING
THROUGH THE ACTIVE WESTERLY FLOW WILL BE DIFFICULT HOWEVER TUESDAY
NIGHT THROUGH WEDNESDAY APPEAR TO BE THE WETTEST PERIOD OF THE
WEEK. ENSEMBLE MODEL GUIDANCE KEEPS THE STRONGEST FORCING FARTHER
NORTH AND BRINGS IN WARMER AIR WHEN COMPARED TO THE GFS AND ECMWF.
FOR THIS REASON KEPT THE EXTENDED PORTION OF THE FORECAST TRENDED
TOWARDS WARMER GUIDANCE AND MAINTAINED LOWER PRECIPITATION CHANCES.
&&
.AVIATION...RAIN AND SNOW SHOWERS WILL DECREASE BUT CONTINUE
THROUGH THE NIGHT AND START TO INCREASE AGAIN EARLY IN THE MORNING
WITH THE NEXT APPROACHING SYSTEM. PARTIAL MOUNTAIN OBSCURATIONS
WILL INCREASE OVERNIGHT. CEILINGS AND VISIBILITY WILL
VARY...OFTEN QUICKLY WITH SHOWERS...BUT OVERALL THERE SHOULD BE
FEW IMPACTS FOR THE MAJOR TERMINALS SUCH AS KMSO...KGPI...AND KBTM.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER WEATHER ADVISORY FROM 6 AM SATURDAY TO MIDNIGHT MDT
SUNDAY NIGHT BUTTE/BLACKFOOT REGION.
WINTER STORM WATCH FROM SATURDAY MORNING THROUGH SUNDAY
AFTERNOON FOR LOST TRAIL PASS.
ID...WINTER STORM WATCH FROM SATURDAY MORNING THROUGH SUNDAY
AFTERNOON FOR LOST TRAIL PASS.
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 6 PM MDT SUNDAY
ABOVE 6500 FEET FOR THE EASTERN LEMHI COUNTY.
&&
SHORT TERM...LEACH
LONG TERM....BAUCK/LOEFFELBEIN
AVIATION...LEACHThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 7:15 PM PDT | Areal Flood Advisory | MSO | Lincoln | 13 hr |
| Mar 16, 2:02 PM PDT | Winter Storm Watch | MSO | Granite, Missoula, Ravalli | 8 hr |
| Mar 16, 2:02 PM PDT | Winter Weather Advisory | MSO | Deer Lodge, Granite, Powell, Silver Bow | 46 hr |
Nearby
Areal Flood Advisories in Idaho, 2012Every areal flood advisory in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.