Alert archive / Idaho / Winter Storm Warnings in 2009
Winter Storm Warning 16, NWS Missoula, MT
NWS Missoula, MT issued this winter storm warning at Apr 1, 2009, 8:58 PM PDT for Clearwater County, Idaho. It took effect at Apr 1, 2009, 11:00 PM PDT. It was in force for 22 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 1, 2009, 8:58 PM PDT (03:58 UTC)
- In effect from
- Apr 1, 2009, 11:00 PM PDT
- Expired
- Apr 2, 2009, 8:47 PM PDT
- In force
- 22 hr
- Issued by
- NWS Missoula, MT
County Clearwater County, ID
The radar
The Missoula radar (KMSX), 133 km from the middle of the area, began a volume at 03:59 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 2, 8:30 AM PDT | HEAVY SNOW 8 | 5 Nnw Orofino, ID |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 4.0 hours before the alert went out and 127 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 691 m above ground
- 0-6 km bulk shear
- 85 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS45 KMSO 020358 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 958 PM MDT WED APR 1 2009 .THE ADVANCING PACIFIC STORM SYSTEM IS COMING IN MUCH FURTHER SOUTH THAN PREVIOUSLY FORECAST. NORTH CENTRAL IDAHO IS NOW THE AREA EXPECTED TO BE THE MOST IMPACTED BY THIS SYSTEM...WITH MUCH LESSER AMOUNTS IN NORTHWEST MONTANA. WITH THE COOL LOW LEVELS FROM THE CONVECTIVE SHOWERS EARLIER TODAY...THE PRECIPITATION CURRENTLY MOVING IN IS FALLING AS SNOW. SNOW LEVELS WILL REMAIN NEARLY STEADY OR FALL SLIGHTLY AFTER MIDNIGHT WITH THE PRECIPITATION MOVING IN. THE BEST ACCUMULATING SNOW IS EXPECTED OVER THE CENTRAL AND NORTHERN CLEARWATER MOUNTAINS INCLUDING LOLO PASS AND THE HIGHER TERRAIN OF THE CAMAS PRAIRIE INCLUDING WHITEBIRD AND GREER GRADES. WITH SNOW LEVELS RISING IN THE AFTERNOON...SNOW WILL CONTINUE...BUT ACCUMULATIONS ARE EXPECTED TO DECREASE AS THERE IS SETTLING AND OR MELTING AS IT FALLS...ESPECIALLY IN THE CAMAS PRAIRIE REGION. WITH THE PASSAGE OF A SURFACE FRONT...INCREASED WINDS IN THE AFTERNOON WILL PRODUCE AREAS OF BLOWING SNOW REDUCING VISIBILITIES. LOCAL BLIZZARD CONDITIONS ARE POSSIBLE OVER WHITEBIRD AND GREER GRADES IN THE AFTERNOON. MTZ002-004-020500- /O.CAN.KMSO.WW.Y.0049.090402T0600Z-090403T0600Z/ WEST GLACIER REGION-LOWER CLARK FORK REGION- 958 PM MDT WED APR 1 2009 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WINTER WEATHER ADVISORY. HEAVIEST SNOW ACCUMULATIONS ARE EXPECTED SOUTH OF LOOKOUT AND MARIAS PASSES. THEREFORE THE WINTER WEATHER ADVISORY HAS BEEN CANCELLED. $$ IDZ005-021200- /O.NEW.KMSO.WS.W.0016.090402T0600Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 858 PM PDT WED APR 1 2009 ...WINTER STORM WARNING IN EFFECT UNTIL 11 PM PDT THURSDAY... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER STORM WARNING FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT UNTIL 11 PM PDT THURSDAY. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES...LOCALLY UP TO 10 INCHES ARE EXPECTED BY THURSDAY EVENING. INCREASED AFTERNOON WINDS WILL PRODUCE REDUCED VISIBILITIES FROM BLOWING AND DRIFTING SNOW. GREER GRADE AND STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM.. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW... BLOWING SNOW...OR FREEZING RAIN ARE EXPECTED OR OCCURRING. STRONG WINDS AND DANGEROUS WIND CHILLS ARE ALSO POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ IDZ006-007-021200- /O.NEW.KMSO.WW.Y.0050.090402T0600Z-090402T2100Z/ SOUTHERN CLEARWATER MOUNTAINS-OROFINO/GRANGEVILLE REGION- 858 PM PDT WED APR 1 2009 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 2 PM PDT THURSDAY ABOVE 2500 FEET... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW AND BLOWING SNOW ABOVE 2500 FEET... WHICH IS IN EFFECT UNTIL 2 PM PDT THURSDAY. TOTAL SNOW ACCUMULATIONS OF 3 TO 6 INCHES CAN BE EXPECTED WITH LOCALLY HIGHER AMOUNTS UP TO 8 INCHES ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION EXPECTED BELOW. INCREASE AFTERNOON WINDS WILL RESULT IN AREAS OF BLOWING AND DRIFTING SNOW AND REDUCED VISIBILITIES. WHITEBIRD AND GREER GRADES AND COTTONWOOD WILL BE IMPACTED BY THIS STORM WITH LOCAL BLIZZARD CONDITIONS POSSIBLE OVER THE GRADES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-021200- /O.NEW.KMSO.WW.Y.0050.090402T0600Z-090403T0600Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 958 PM MDT WED APR 1 2009 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT THURSDAY NIGHT ABOVE 4500 FEET FOR LOLO PASS... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW ABOVE 4500 FEET FOR LOLO PASS... WHICH IS IN EFFECT UNTIL MIDNIGHT MDT THURSDAY NIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 6 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS UP TO 8 INCHES OVER LOLO PASS. THE MAIN AREA OF IMPACT WILL BE ALONG HIGHWAY 12 OVER LOLO PASS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
6 follow-up statements
000 WWUS45 KMSO 020934 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 334 AM MDT THU APR 2 2009 .A PACIFIC STORM SYSTEM WILL MOVE THROUGH THE REGION TODAY BRINGING ACCUMULATING SNOWFALL TO THE MOUNTAINS OF WESTERN MONTANA AND CENTRAL IDAHO. THE NORTHERN AND CENTRAL CLEARWATER MOUNTAINS AS WELL AS THE BITTERROOT RANGE ARE EXPECTED TO RECEIVE THE HEAVIEST SNOWFALL TOTALS. THIS INCLUDES LOLO PASS AND THE HIGHER TERRAIN OF THE CAMAS PRAIRIE INCLUDING WHITEBIRD AND GREER GRADES. ALTHOUGH SNOW IS EXPECTED TO FALL THROUGH THE DAY REGION WIDE...SNOW LEVELS ARE EXPECTED TO RISE DURING THE AFTERNOON LIMITING MOST ACCUMULATIONS TO THE HIGHER TERRAIN. THIS WILL ESPECIALLY BE TRUE ACROSS THE CAMAS PRAIRIE REGION OF EAST CENTRAL IDAHO. A ROBUST COLD FRONT WILL PASS ACROSS THE AREA DURING THE AFTERNOON HOURS. INCREASED WINDS ALONG THE FRONT MAY COMBINE WITH BURSTS OF HEAVY SNOWFALL INITIATED BY THE FRONTAL PASSAGE TO PRODUCE AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. LOCAL BLIZZARD OR WHITEOUT CONDITIONS ARE POSSIBLE OVER WHITEBIRD AND GREER GRADES IN THE AFTERNOON. IDZ005-021745- /O.CON.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 234 AM PDT THU APR 2 2009 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES...LOCALLY UP TO 10 INCHES ARE EXPECTED BY THIS EVENING. INCREASED AFTERNOON WINDS WILL PRODUCE REDUCED VISIBILITIES FROM BLOWING SNOW. GREER GRADE AND STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW... BLOWING SNOW...OR FREEZING RAIN ARE EXPECTED OR OCCURRING. STRONG WINDS AND DANGEROUS WIND CHILLS ARE ALSO POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ IDZ006-007-021745- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090402T2100Z/ SOUTHERN CLEARWATER MOUNTAINS-OROFINO/GRANGEVILLE REGION- 234 AM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON ABOVE 2500 FEET... A WINTER WEATHER ADVISORY ABOVE 2500 FEET REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON. TOTAL SNOW ACCUMULATIONS OF 3 TO 6 INCHES CAN BE EXPECTED WITH LOCALLY HIGHER AMOUNTS ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASE AFTERNOON WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. WHITEBIRD GRADE...GREER GRADE...AND COTTONWOOD WILL BE IMPACTED BY THIS STORM WITH LOCAL BLIZZARD OR WHITEOUT CONDITIONS POSSIBLE OVER THE GRADES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-021745- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 334 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT ABOVE 4500 FEET... A WINTER WEATHER ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 6 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO PASS AND IN THE HIGHER TERRAIN. THE MAIN AREA OF IMPACT WILL BE ALONG HIGHWAY 12 OVER LOLO PASS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
000 WWUS45 KMSO 021339 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 739 AM MDT THU APR 2 2009 .A PACIFIC STORM SYSTEM WILL MOVE THROUGH THE REGION TODAY BRINGING ACCUMULATING SNOWFALL TO THE MOUNTAINS OF WESTERN MONTANA AND CENTRAL IDAHO. THE NORTHERN AND CENTRAL CLEARWATER MOUNTAINS AS WELL AS THE BITTERROOT RANGE ARE EXPECTED TO RECEIVE THE HEAVIEST SNOWFALL TOTALS. THIS INCLUDES LOLO PASS AND THE HIGHER TERRAIN OF THE CAMAS PRAIRIE INCLUDING WHITE BIRD AND GREER GRADES. A ROBUST COLD FRONT WILL PASS ACROSS THE AREA DURING THE AFTERNOON HOURS. INCREASED WINDS ALONG THE FRONT MAY COMBINE WITH BURSTS OF HEAVY SNOWFALL INITIATED BY THE FRONTAL PASSAGE TO PRODUCE AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. LOCAL BLIZZARD OR WHITEOUT CONDITIONS ARE POSSIBLE OVER WHITE BIRD AND GREER GRADES IN THE AFTERNOON. IDZ005-022130- /O.CON.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 639 AM PDT THU APR 2 2009 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 5 TO 10 INCHES ARE EXPECTED BY THIS EVENING. INCREASED AFTERNOON WINDS WILL PRODUCE REDUCED VISIBILITIES FROM BLOWING SNOW. GREER GRADE AND STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW... BLOWING SNOW...OR FREEZING RAIN ARE EXPECTED OR OCCURRING. STRONG WINDS AND DANGEROUS WIND CHILLS ARE ALSO POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ MTZ004-022130- /O.EXA.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ LOWER CLARK FORK REGION- 739 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ALONG THE INTERSTATE 90 CORRIDOR...PARTICULARLY FROM ST. REGIS TO LOOKOUT PASS. ELSEWHERE...VALLEYS WILL GENERALLY SEE 2 TO 4 INCHES OF NEW SNOW. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ IDZ006-007-022130- /O.EXT.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ SOUTHERN CLEARWATER MOUNTAINS-OROFINO/GRANGEVILLE REGION- 639 AM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2500 FEET... THE WINTER WEATHER ADVISORY ABOVE 2500 FEET IS NOW IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASE AFTERNOON WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. WHITE BIRD GRADE...GREER GRADE...AND COTTONWOOD WILL BE IMPACTED BY THIS STORM WITH LOCAL BLIZZARD OR WHITEOUT CONDITIONS POSSIBLE OVER THE GRADES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-022130- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 739 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT ABOVE 4500 FEET... A WINTER WEATHER ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO PASS AND IN THE HIGHER TERRAIN. THE MAIN AREA OF IMPACT WILL BE ALONG HIGHWAY 12 OVER LOLO PASS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...BLOWING SNOW...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
000 WWUS45 KMSO 021645 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 1045 AM MDT THU APR 2 2009 IDZ005-030045- /O.CON.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 945 AM PDT THU APR 2 2009 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 5 TO 10 INCHES ARE EXPECTED BY THIS EVENING. INCREASED AFTERNOON WINDS WILL PRODUCE REDUCED VISIBILITIES FROM BLOWING SNOW. STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ MTZ004-030045- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ LOWER CLARK FORK REGION- 1045 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ALONG THE INTERSTATE 90 CORRIDOR...PARTICULARLY FROM ST. REGIS TO LOOKOUT PASS. ELSEWHERE...VALLEYS WILL GENERALLY SEE 2 TO 4 INCHES OF NEW SNOW. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ IDZ006-007-030045- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ SOUTHERN CLEARWATER MOUNTAINS-OROFINO/GRANGEVILLE REGION- 945 AM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2500 FEET... A WINTER WEATHER ADVISORY ABOVE 2500 FEET REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASE AFTERNOON WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. WHITE BIRD GRADE...GREER GRADE...AND COTTONWOOD WILL BE IMPACTED BY THIS STORM WITH LOCAL BLIZZARD OR WHITEOUT CONDITIONS POSSIBLE OVER THE GRADES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-030045- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 1045 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT ABOVE 4500 FEET... A WINTER WEATHER ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO AND LOST TRAIL PASSES. INCREASING WINDS THIS AFTERNOON COULD CAUSE BLOWING SNOW AND REDUCED VISIBILITIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
000 WWUS45 KMSO 021725 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 1125 AM MDT THU APR 2 2009 IDZ005-030130- /O.CON.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 1025 AM PDT THU APR 2 2009 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 5 TO 10 INCHES ARE EXPECTED BY THIS EVENING. INCREASED AFTERNOON WINDS WILL PRODUCE REDUCED VISIBILITIES FROM BLOWING SNOW. STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ MTZ043-030130- /O.EXA.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ POTOMAC/SEELEY LAKE REGION- 1125 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 4 INCHES CAN BE EXPECTED IN THE SEELEY LAKE REGION THROUGH THURSDAY EVENING. ACCUMULATING SNOW MAY CREATE HAZARDOUS DRIVING CONDITIONS ALONG HIGHWAY 83 AND LOCAL AREA ROADS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ004-030130- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ LOWER CLARK FORK REGION- 1125 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ALONG THE INTERSTATE 90 CORRIDOR...PARTICULARLY FROM ST. REGIS TO LOOKOUT PASS. ELSEWHERE...VALLEYS WILL GENERALLY SEE 2 TO 4 INCHES OF NEW SNOW. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ IDZ006-007-030130- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ SOUTHERN CLEARWATER MOUNTAINS-OROFINO/GRANGEVILLE REGION- 1025 AM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2500 FEET... A WINTER WEATHER ADVISORY ABOVE 2500 FEET REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASE AFTERNOON WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. WHITE BIRD GRADE...GREER GRADE...AND COTTONWOOD WILL BE IMPACTED BY THIS STORM WITH LOCAL BLIZZARD OR WHITEOUT CONDITIONS POSSIBLE OVER THE GRADES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-030130- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 1125 AM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT ABOVE 4500 FEET... A WINTER WEATHER ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO AND LOST TRAIL PASSES. INCREASING WINDS THIS AFTERNOON COULD CAUSE BLOWING SNOW AND REDUCED VISIBILITIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
000 WWUS45 KMSO 022048 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 248 PM MDT THU APR 2 2009 MTZ043-022200- /O.CAN.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ POTOMAC/SEELEY LAKE REGION- 248 PM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WINTER WEATHER ADVISORY. SNOW SHOWERS CAN BE EXPECTED TO CONTINUE ACROSS THE SEELEY SWAN VALLEY WITH LIGHT ACCUMULATIONS OF UP TO TWO INCHES THROUGH THE EVENING HOURS. WHILE SNOW SHOWERS WILL REMAIN OVER THE VALLEY AREA...HEAVY ACCUMULATIONS ARE NOT EXPECTED. THEREFORE THE WINTER WEATHER ADVISORY HAS BEEN CANCELLED. $$ IDZ005-030600- /O.CON.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 148 PM PDT THU APR 2 2009 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. ADDITIONAL SNOW ACCUMULATIONS OF 3 TO 6 INCHES ARE EXPECTED THROUGH THIS EVENING. BREEZY WEST WINDS WILL PRODUCE BLOWING SNOW AND REDUCED VISIBILITIES AT TIMES. STATE HIGHWAY 11 FROM PIERCE TO HEADQUARTERS WILL BE IMPACTED BY THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW AND BLOWING SNOW ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. && $$ IDZ006-030600- /O.EXT.KMSO.WW.Y.0050.000000T0000Z-090403T1200Z/ SOUTHERN CLEARWATER MOUNTAINS- 148 PM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 AM PDT FRIDAY ABOVE 2500 FEET... THE WINTER WEATHER ADVISORY ABOVE 2500 FEET IS NOW IN EFFECT UNTIL 5 AM PDT FRIDAY. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 5 INCHES CAN BE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASED WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-030600- /O.EXT.KMSO.WW.Y.0050.000000T0000Z-090403T1200Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 248 PM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM MDT FRIDAY ABOVE 4500 FEET... THE WINTER WEATHER ADVISORY ABOVE 4500 FEET IS NOW IN EFFECT UNTIL 6 AM MDT FRIDAY. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO AND LOST TRAIL PASSES. BREEZY WEST WINDS COULD CAUSE BLOWING SNOW AND REDUCED VISIBILITIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ004-030600- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ LOWER CLARK FORK REGION- 248 PM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ALONG THE INTERSTATE 90 CORRIDOR...PARTICULARLY FROM ST. REGIS TO LOOKOUT PASS. ELSEWHERE...VALLEYS WILL GENERALLY SEE 2 TO 4 INCHES OF NEW SNOW. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ IDZ007-030600- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ OROFINO/GRANGEVILLE REGION- 148 PM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2500 FEET... A WINTER WEATHER ADVISORY ABOVE 2500 FEET REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. WIDESPREAD SNOW SHOWERS PERSIST THROUGH THE EVENING MAINLY IN THE LOWER HILLS NORTH OF HIGHWAY 12 FROM KOOSKIA TO NEAR OROFINO. AN ADDITIONAL 3 TO 6 INCHES OF SNOW ARE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. BREEZY WEST WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. THE MAIN IMPACT WILL BE ON THE GREER GRADE TO WEIPPE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
000 WWUS45 KMSO 030347 AAA WSWMSO URGENT - WINTER WEATHER MESSAGE...UPDATED NATIONAL WEATHER SERVICE MISSOULA MT 947 PM MDT THU APR 2 2009 IDZ005-030500- /O.CAN.KMSO.WS.W.0016.000000T0000Z-090403T0600Z/ NORTHERN CLEARWATER MOUNTAINS- 847 PM PDT THU APR 2 2009 ...WINTER STORM WARNING IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WINTER STORM WARNING. SNOW SHOWERS WILL CONTINUE OVERNIGHT...BUT WIDESPREAD ACCUMULATIONS ARE NOT EXPECTED. THEREFORE THE WINTER STORM WARNING HAS BEEN CANCELLED. LOCAL ACCUMULATIONS WILL GENERALLY REMAIN BETWEEN 1 TO 3 INCHES POSSIBLE BY MORNING. ACCUMULATIONS WILL BE A DIRECT RESULT OF HEAVIER ISOLATED BANDS. $$ MTZ004-030500- /O.CAN.KMSO.WW.Y.0050.000000T0000Z-090403T0600Z/ LOWER CLARK FORK REGION- 947 PM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WINTER WEATHER ADVISORY. SNOW SHOWERS WILL CONTINUE TO DECREASE THE REMAINDER OF THE EVENING ENDING WIDESPREAD ACCUMULATING SNOW. THEREFORE THE SNOW ADVISORY HAS BEEN CANCELLED. $$ IDZ007-031200- /O.EXT.KMSO.WW.Y.0050.000000T0000Z-090403T1200Z/ OROFINO/GRANGEVILLE REGION- 847 PM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 AM PDT FRIDAY ABOVE 2500 FEET... THE WINTER WEATHER ADVISORY ABOVE 2500 FEET IS NOW IN EFFECT UNTIL 5 AM PDT FRIDAY. WIDESPREAD SNOW SHOWERS WILL PERSIST THROUGH THE OVERNIGHT HOURS. AN ADDITIONAL 3 TO 6 INCHES OF SNOW ARE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. BREEZY WEST WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES. THE MAIN IMPACT WILL BE ON THE GREER GRADE TO WEIPPE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ IDZ006-031200- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T1200Z/ SOUTHERN CLEARWATER MOUNTAINS- 847 PM PDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM PDT FRIDAY ABOVE 2500 FEET... A WINTER WEATHER ADVISORY ABOVE 2500 FEET REMAINS IN EFFECT UNTIL 5 AM PDT FRIDAY. ADDITIONAL SNOW ACCUMULATIONS OF 2 TO 5 INCHES CAN BE EXPECTED ABOVE 2500 FEET. LITTLE TO NO ACCUMULATION IS EXPECTED BELOW THIS ELEVATION. INCREASED WINDS WILL RESULT IN AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MTZ006-031200- /O.CON.KMSO.WW.Y.0050.000000T0000Z-090403T1200Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 947 PM MDT THU APR 2 2009 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY ABOVE 4500 FEET... A WINTER WEATHER ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY. TOTAL SNOW ACCUMULATIONS OF 4 TO 8 INCHES CAN BE EXPECTED ABOVE 4500 FEET WITH LOCALLY HIGHER AMOUNTS OVER LOLO AND LOST TRAIL PASSES. BREEZY WEST WINDS COULD CAUSE BLOWING SNOW AND REDUCED VISIBILITIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$
What forecasters said that day
The local office's own words before this winter storm warning 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 winter storm warning went out at Apr 1, 1:55 PM PDT, 7 hours 3 minutes earlier.
Area forecast discussion, Apr 1, 1:55 PM PDT, 7 hours 3 minutes before
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE MISSOULA MT
255 PM MDT WED APR 1 2009
WINTER WEATHER HIGHLIGHTS ARE IN EFFECT FOR THE NORTHWEST
MONTANA MOUNTAIN PASSES. SEE WWW.WEATHER.GOV/MISSOULA FOR DETAILS
.DISCUSSION...ANOTHER WINTER WEATHER DISTURBANCE WILL MOVE
THROUGH THE NORTHERN ROCKIES BEGINNING LATE THIS EVENING THROUGH
THURSDAY EVENING. PLENTY OF MOISTURE AND DYNAMICS IN THE FORM OF
OROGRAPHIC LIFT ARE AVAILABLE TO PRODUCE SIGNIFICANT
PRECIPITATION. SNOW LEVELS WILL START FAIRLY LOW BUT THEN QUICKLY
RISE THURSDAY MORNING THROUGH THE AFTERNOON HOURS TO AROUND 5000
FEET IN CENTRAL IDAHO AND WEST CENTRAL MONTANA AND AROUND 4000
FEET IN NORTHWEST MONTANA. BECAUSE OF THE HIGHER SNOW LEVELS THE
ONLY IMPACT FROM ACCUMULATING SNOW WILL BE OVER THE MOUNTAIN
PASSES. THERE IS UNCERTAINTY AS TO HOW MUCH SNOW OR RAIN/SNOW MIX
LOLO PASS WILL RECEIVE THUS THEY HAVE NOT BEEN INCLUDED IN ANY
WINTER WEATHER HIGHLIGHTS NOW BUT MAY BE NEEDED LATER.
THURSDAY NIGHT AND FRIDAY...THE COLD FRONT WILL PUSH THROUGH THE REGION
LATE THURSDAY AFTERNOON AND EVENING. COLDER AND MORE UNSTABLE AIR
BEHIND THE FRONT WILL BE CONDUCIVE FOR WIDESPREAD SNOW
SHOWERS THROUGH FRIDAY AFTERNOON. ALONG WITH THE COLD FRONT WILL
BE AN AMPLIFYING TROF OVER THE ENTIRE WEST WITH THE MAJORITY OF
ENERGY FORMING IN THE GREAT BASIN. MODELS ARE INDICATING A 700 MB
LOW DEVELOPING IN THE NORTHERN BRANCH OF THIS SPLIT FLOW IN SOUTH
CENTRAL IDAHO. THIS MID LEVEL FEATURE IN ADDITION TO WRAP AROUND
MOISTURE BEHIND THE EXITING SURFACE LOW AND DEFORMATION BOUNDARY
COULD BRING A POTENTIAL FOR A BAND OF SIGNIFICANT SNOWFALL. THE
UNCERTAINTY WITH THIS SOLUTION IS MODELS DO DIFFER WITH THE
POSITIONING OF THIS BOUNDARY ANYWHERE FROM SOUTH CENTRAL OR EAST
CENTRAL IDAHO TO SOUTHWEST MONTANA. A HAZARDOUS WEATHER OUTLOOK
WILL BE POSTED FOR THESE AREAS.
A SHORTWAVE RIDGE WILL MOVE INTO THE NORTHWEST UNITED STATES ON
SATURDAY AND INTO THE NORTHERN ROCKIES SUNDAY. THIS WILL DRY OUT
AND WARM UP THE REGION THROUGH MONDAY. UNCERTAINTY STILL EXIST
BEYOND MONDAY WITH THE GFS AND ITS ENSEMBLES BRINGING A LOW
PRESSURE SYSTEM THROUGH SOUTHERN IDAHO WHICH PRODUCES THE
POTENTIAL OF SOME RAIN AND SNOW. BOTH THE ECMWF AND CANADIAN
MODELS HOWEVER KEEP THIS SYSTEM SOUTH OF IDAHO AND TAKE IT INTO
THE GREAT PLAINS. WITH THE GFS BEING THE OUTLIER KEPT A SMALL
CHANCE OF PRECIPITATION ACROSS THE SOUTHERN PORTION OF THE REGION
AND WENT WITH THE WARMER TEMPERATURES THE OTHER TWO MODELS
SUGGESTED.
&&
.AVIATION...SHOWER ACTIVITY WILL GRADUALLY INCREASE THIS EVENING AND
OVER NIGHT AHEAD OF AN APPROACHING LOW PRESSURE SYSTEM. EXPECT TO
SEE A GRADUAL LOWERING OF CEILINGS THROUGH THE NIGHT AS A WARM
FRONT MOVES THROUGH THE REGION AND SPREADS PRECIPITATION FIRST
INTO NORTH CENTRAL IDAHO...AND THEN INTO WESTERN MONTANA BY EARLY
MORNING. AS CEILINGS LOWER...EXPECT MOUNTAINS AND PASSES TO BECOME
OBSCURED. THE SNOW LEVEL WILL GRADUALLY INCREASE TO BETWEEN 4000
AND 5000 FEET BY TOMORROW AFTERNOON...BRINGING RAIN OR A RAIN SNOW
MIX TO THE VALLEYS AND SNOW OVER THE HIGHER TERRAIN. VISIBILITY
WILL BECOME RESTRICTED LATE TONIGHT AND TOMORROW MORNING...ESPECIALLY
IN LOCATIONS RECEIVING SNOW. AIRFIELDS KMSO...KGPI AND KSMN CAN
ALL EXPECT DETERIORATING CONDITIONS AROUND 12Z THURSDAY WITH KBTM
DETERIORATING AROUND 17Z THURSDAY.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO MIDNIGHT
MDT THURSDAY NIGHT FOR LOWER CLARK FORK REGION.
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO MIDNIGHT MDT
THURSDAY NIGHT FOR WEST GLACIER REGION.
ID...NONE.
&&
SHORT TERM...RPN
LONG TERM....LOEFFELBEIN
AVIATION...VIAHazardous weather outlook, Apr 1, 1:54 PM PDT, 7 hours 4 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MISSOULA MT 254 PM MDT WED APR 1 2009 IDZ006-MTZ006-021100- SOUTHERN CLEARWATER MOUNTAINS-BITTERROOT/SAPPHIRE MOUNTAINS- 254 PM MDT WED APR 1 2009 /154 PM PDT WED APR 1 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL IDAHO AND WEST CENTRAL MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT SNOW SHOWERS WILL INCREASE OVER THE AREA TONIGHT AHEAD OF AN APPROACHING WEATHER SYSTEM. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ANOTHER SPRINGTIME SNOW STORM WILL MOVE THROUGH THE NORTHERN ROCKIES THURSDAY AND THURSDAY NIGHT BRINGING SIGNIFICANT SNOWFALL ACCUMULATIONS MAINLY TO THE BITTERROOT AND CLEARWATER MOUNTAIN RANGES. THE MAIN IMPACT WILL BE TO PEOPLE TRAVELING OVER LOLO PASS WHERE MODERATE SNOW ACCUMULATIONS ARE POSSIBLE BY FRIDAY MORNING. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. IDZ010-021100- EASTERN LEMHI COUNTY- 254 PM MDT WED APR 1 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL IDAHO. .DAY ONE...THIS AFTERNOON AND TONIGHT SNOW SHOWERS WILL INCREASE OVER THE AREA TONIGHT AHEAD OF AN APPROACHING WEATHER SYSTEM. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ANOTHER SPRINGTIME SNOW STORM WILL MOVE THROUGH SOUTHERN LEMHI COUNTY DURING THE DAY FRIDAY. STRONG SURFACE WINDS COULD POTENTIALLY COMBINE WITH MODERATE SNOWFALL TO PRODUCE DIFFICULT AND DANGEROUS DRIVING CONDITIONS SOUTH OF SALMON ON HIGHWAY 28 AND US HIGHWAY 93. STAY TUNED FOR UPDATES AND THE POSSIBLE ISSUANCE OF WINTER WEATHER HIGHLIGHTS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 8:58 PM PDT | Winter Weather Advisory | MSO | Clearwater, Idaho | 32 hr |
Nearby
Winter Storm Warnings in Idaho, 2009Every winter storm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.