Alert archive / Idaho / Snow Advisories in 2007
Snow Advisory 21, NWS Missoula, MT
NWS Missoula, MT issued this snow advisory at Apr 17, 2007, 2:24 AM PDT for Idaho County, Idaho. It took effect at Apr 17, 2007, 5:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Apr 17, 2007, 2:24 AM PDT (09:24 UTC)
- In effect from
- Apr 17, 2007, 5:00 AM PDT
- Expired
- Apr 17, 2007, 1:48 PM PDT
- In force
- 9 hr
- Issued by
- NWS Missoula, MT
County Idaho County, ID
The radar
The Missoula radar (KMSX), 175 km from the middle of the area, began a volume at 09:28 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 00:00Z, 9.4 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1892 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 300 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 170924 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 324 AM MDT TUE APR 17 2007 ...A DEVELOPING SPRING STORM SYSTEM WILL IMPACT MUCH OF THE NORTHERN ROCKIES... .A SLOW MOVING STORM SYSTEM WILL CONTINUE TO MOVE INTO THE NORTHERN ROCKIES THIS MORNING BRINGING WIDESPREAD PRECIPITATION. THE SNOW WILL BE MAINLY CONFINED TO THE HIGHER TERRAIN WITH THE SOUTHERN CLEARWATER MOUNTAINS RECEIVING THE BULK OF THE SNOWFALL TODAY. TONIGHT...THE SNOW LEVELS WILL LOWER AS A POTENTIALLY HEAVY BAND OF SNOW IS EXPECTED TO DEVELOP ACROSS SOUTHWEST MONTANA AND PORTIONS NORTH CENTRAL IDAHO. IDZ006-171800- /O.NEW.KMSO.SN.Y.0021.070417T1200Z-070418T0000Z/ /O.NEW.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ SOUTHERN CLEARWATER MOUNTAINS- 224 AM PDT TUE APR 17 2007 ...SNOW ADVISORY IN EFFECT FROM 5 AM EARLY THIS MORNING TO 5 PM PDT THIS AFTERNOON ABOVE 4500 FEET... ...WINTER STORM WATCH IN EFFECT FROM THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SNOW ADVISORY ABOVE 4500 FEET...WHICH IS IN EFFECT FROM 5 AM EARLY THIS MORNING TO 5 PM PDT THIS AFTERNOON. 2 TO 5 INCHES OF SNOW ACCUMULATION...WITH LOCALLY UP TO 6 INCHES WILL FALL TODAY ACROSS THE SOUTHERN CLEARWATER MOUNTAINS ABOVE 4500 FEET. A WINTER STORM WATCH HAS ALSO BEEN ISSUED. THIS WINTER STORM WATCH IS IN EFFECT FROM LATE THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON. A STRONG SPRING STORM SYSTEM IS EXPECTED TO IMPACT CENTRAL IDAHO TONIGHT INTO WEDNESDAY. IF THE STORM FOLLOWS ITS CURRENTLY FORECASTED TRACK...IT HAS THE POTENTIAL TO PRODUCE HEAVY SNOWFALL ACROSS THE SOUTHERN CLEARWATER MOUNTAINS. A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$ IDZ009-010-MTZ002-006-007-043-171800- /O.NEW.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY-WEST GLACIER REGION- BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION- POTOMAC/SEELEY LAKE REGION- 324 AM MDT TUE APR 17 2007 ...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY AFTERNOON. A STRONG SPRING STORM SYSTEM IS EXPECTED TO IMPACT MUCH OF WESTERN MONTANA AND NORTH CENTRAL IDAHO TONIGHT INTO WEDNESDAY. IF THE STORM FOLLOWS ITS CURRENTLY FORECASTED TRACK...IT HAS THE POTENTIAL TO PRODUCE HEAVY SNOWFALL ACROSS MUCH OF THE NORTHERN ROCKIES. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$
2 follow-up statements
000 WWUS45 KMSO 171733 AAA WSWMSO URGENT - WINTER WEATHER MESSAGE...UPDATED NATIONAL WEATHER SERVICE MISSOULA MT 1133 AM MDT TUE APR 17 2007 ...A DEVELOPING SPRING STORM SYSTEM WILL IMPACT MUCH OF THE NORTHERN ROCKIES... IDZ006-172130- /O.CON.KMSO.SN.Y.0021.000000T0000Z-070418T0000Z/ /O.CON.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ SOUTHERN CLEARWATER MOUNTAINS- 1033 AM PDT TUE APR 17 2007 ...SNOW ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON ABOVE 4500 FEET... ...WINTER STORM WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON... A SNOW ADVISORY ABOVE 4500 FEET REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON. A WINTER STORM WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON. A WINTER STORM WATCH HAS ALSO BEEN ISSUED. THIS WINTER STORM WATCH IS IN EFFECT FROM LATE THIS AFTERNOON THROUGH WEDNESDAY AFTERNOON. A STRONG SPRING STORM SYSTEM IS EXPECTED TO IMPACT CENTRAL IDAHO TONIGHT INTO WEDNESDAY. IF THE STORM FOLLOWS ITS CURRENTLY FORECASTED TRACK...IT HAS THE POTENTIAL TO PRODUCE HEAVY SNOWFALL ACROSS THE SOUTHERN CLEARWATER MOUNTAINS. A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$ IDZ009-010-MTZ002-006-007-043-172130- /O.CON.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY-WEST GLACIER REGION- BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION- POTOMAC/SEELEY LAKE REGION- 1133 AM MDT TUE APR 17 2007 ...WINTER STORM WATCH REMAINS IN EFFECT FROM 6 PM MDT THIS EVENING THROUGH WEDNESDAY AFTERNOON... A WINTER STORM WATCH REMAINS IN EFFECT FROM 6 PM MDT THIS EVENING THROUGH WEDNESDAY AFTERNOON. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$
000 WWUS45 KMSO 172048 WSWMSO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 248 PM MDT TUE APR 17 2007 .A DEVELOPING SPRING STORM SYSTEM WILL IMPACT MUCH OF THE NORTHERN ROCKIES TONIGHT AND WEDNESDAY. A SURFACE TROUGH AND ASSOCIATED COLD FRONT WILL DEEPEN DURING THE DAY AS IT PASSES THROUGH THE REGION. GOOD UPPER LEVEL SUPPORT...COLDER AIR ALOFT AND THE LOCATION OF THIS SYSTEM IN SOUTHERN IDAHO ARE COMBINING TO CREATE A SIGNIFICANT SNOW EVENT FOR IDAHO IN THE SOUTHERN CLEARWATERS AND LEMHI COUNTY AND IN WESTERN MONTANA FROM THE SOUTHWEST PORTION OF THE STATE NORTH THROUGH GLACIER NATIONAL PARK. IDZ006-180400- /O.CAN.KMSO.SN.Y.0021.000000T0000Z-070418T0000Z/ /O.UPG.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ /O.NEW.KMSO.HS.W.0009.070418T0000Z-070419T0000Z/ SOUTHERN CLEARWATER MOUNTAINS- 148 PM PDT TUE APR 17 2007 ...HEAVY SNOW WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM PDT WEDNESDAY... ...SNOW ADVISORY IS CANCELLED... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HEAVY SNOW WARNING...WHICH IS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM PDT WEDNESDAY. THE SNOW ADVISORY HAS BEEN CANCELLED. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW ACCUMULATIONS OF 8 TO 12 INCHES WITH LOCAL AMOUNTS UP TO 18 INCHES WILL OCCUR IN THE SOUTHERN CLEARWATER MOUNTAINS. THE HIGHER VALLEYS WILL RECEIVE 3 TO 6 INCHES BY WEDNESDAY AFTERNOON. A HEAVY SNOW WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. $$ MTZ007-043-180400- /O.UPG.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ /O.NEW.KMSO.HS.W.0009.070418T0900Z-070419T0000Z/ BUTTE/BLACKFOOT REGION-POTOMAC/SEELEY LAKE REGION- 248 PM MDT TUE APR 17 2007 ...HEAVY SNOW WARNING IN EFFECT FROM 3 AM TO 6 PM MDT WEDNESDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HEAVY SNOW WARNING...WHICH IS IN EFFECT FROM 3 AM TO 6 PM MDT WEDNESDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW ACCUMULATIONS OF 8 TO 12 INCHES WITH LOCAL AMOUNTS UP TO 16 INCHES WILL OCCUR IN THE BUTTE BLACKFOOT AND POTOMAC SEELEY LAKE REGIONS. INCREASED AFTERNOON WINDS MAY CREATE AREAS OF BLOWING AND DRIFTING SNOW...ESPECIALLY OVER THE PASSES. THE HIGHER VALLEYS WILL RECEIVE 3 TO 6 INCHES BY WEDNESDAY AFTERNOON. A HEAVY SNOW WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. $$ MTZ006-180400- /O.UPG.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ /O.NEW.KMSO.HS.W.0009.070418T0000Z-070419T0000Z/ BITTERROOT/SAPPHIRE MOUNTAINS- 248 PM MDT TUE APR 17 2007 ...HEAVY SNOW WARNING IN EFFECT FROM 6 PM THIS EVENING TO 6 PM MDT WEDNESDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HEAVY SNOW WARNING...WHICH IS IN EFFECT FROM 6 PM THIS EVENING TO 6 PM MDT WEDNESDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW ACCUMULATIONS OF 8 TO 12 INCHES WITH LOCAL AMOUNTS UP TO 18 INCHES WILL OCCUR IN THE BITTERROOT AND SAPPHIRE MOUNTAINS. THE HIGHER VALLEYS WILL RECEIVE 3 TO 6 INCHES BY WEDNESDAY AFTERNOON. A HEAVY SNOW WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. $$ IDZ009-010-180400- /O.UPG.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ /O.NEW.KMSO.HS.W.0009.070418T0300Z-070418T1200Z/ WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY- 248 PM MDT TUE APR 17 2007 ...HEAVY SNOW WARNING IN EFFECT FROM 9 PM THIS EVENING TO 6 AM MDT WEDNESDAY ABOVE 6000 FEET... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HEAVY SNOW WARNING ABOVE 6000 FEET...WHICH IS IN EFFECT FROM 9 PM THIS EVENING TO 6 AM MDT WEDNESDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW ACCUMULATIONS OF 4 TO 9 INCHES WILL OCCUR IN THE MOUNTAINS OF LEMHI COUNTY ABOVE 6000 FEET. A HEAVY SNOW WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. $$ MTZ002-180400- /O.UPG.KMSO.WS.A.0009.070418T0000Z-070419T0000Z/ /O.NEW.KMSO.HS.W.0009.070418T0900Z-070419T0600Z/ WEST GLACIER REGION- 248 PM MDT TUE APR 17 2007 ...HEAVY SNOW WARNING IN EFFECT FROM 3 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HEAVY SNOW WARNING...WHICH IS IN EFFECT FROM 3 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW ACCUMULATIONS OF 8 TO 14 INCHES WITH LOCAL AMOUNTS UP TO 18 INCHES WILL OCCUR IN THE WEST GLACIER REGION. THE HIGHER VALLEYS WILL RECEIVE UP TO 6 INCHES BY WEDNESDAY EVENING. A HEAVY SNOW WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. $$ DEROSA/MEAD/WHITMORE
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 2:24 AM PDT | Winter Storm Watch | MSO | Idaho, Lemhi | 11 hr |
| Apr 17, 1:48 PM PDT | Heavy Snow Warning | MSO | Idaho, Lemhi | 31 hr |
Nearby
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.