Alert archive / Idaho / Special Weather Statements in 2011
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Jul 16, 2011, 1:47 PM PDT for Idaho County, Idaho. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 16, 2011, 1:47 PM PDT (20:47 UTC)
- Expired
- Jul 16, 2011, 2:45 PM PDT
- In force
- 58 min
- Issued by
- NWS Missoula, MT
County Idaho County, ID
The radar
The Missoula radar (KMSX), 123 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 186 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
- 1801 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 16, 1:21 PM PDT, 26 minutes earlier.
Area forecast discussion, Jul 16, 1:21 PM PDT, 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 221 PM MDT SAT JUL 16 2011 .DISCUSSION...AN EMBEDDED SHORTWAVE TROUGH OVER EASTERN OREGON AND WASHINGTON WILL CONTINUE MOVING EASTWARD OVER THE NORTHERN ROCKIES THIS AFTERNOON. THIS WAVE WILL COMBINE WITH DAYTIME HEATING AND PLENTY OF LOW AND MID LEVEL MOISTURE TO FIRE OFF THUNDERSTORMS THIS AFTERNOON THROUGH LATE EVENING. THUNDERSTORM DEVELOPMENT WILL OCCUR FIRST ACROSS CENTRAL IDAHO...THEN FILL IN ACROSS WESTERN MONTANA THROUGHOUT THE AFTERNOON. THE MORE DAYTIME SUN WE EXPERIENCE AND THE MORE HEATING THAT IS GENERATED WILL ONLY CAUSE THE ATMOSPHERE TO DESTABILIZE FURTHER...AIDING IN THUNDERSTORM GROWTH POTENTIAL. ASIDE FROM PLENTY OF LIGHTNING...THE IMPACTS EXPECTED FROM STORMS THAT DEVELOP TODAY WILL BE GUSTY WINDS AND SMALL HAIL...ALONG WITH BRIEF BUT HEAVY BURSTS OF RAINFALL. QUICK REDUCTIONS IN VISIBILITY WILL BE COMMON UNDER THESE HEAVIER DOWNPOURS...WHICH COULD CAUSE MINOR TRAVEL DIFFICULTIES. THOSE WHO HAVE RECREATION PLANS ON OR AROUND AREA LAKES SHOULD HEED TO QUICKLY CHANGING CONDITIONS THAT OCCUR WITH THUNDERSTORMS...PARTICULARLY THE GUSTY OUTFLOW WINDS POSSIBLE WITH SOME OF THE STORMS THAT DEVELOP TODAY. THUNDERSTORM ACTIVITY IS EXPECTED TO LAST THROUGH LATE THIS EVENING AND POSSIBLY AFTER THE SUN HAS SET...WITH RAINFALL GRADUALLY TURNING TO GENTLE SHOWERS PAST MIDNIGHT. SUNDAY MORNING WILL BE MUCH IMPROVED...THOUGH A FEW LINGERING SHOWERS ARE POSSIBLE ACROSS NORTHWEST MONTANA THROUGH MID SUNDAY MORNING. TUESDAY AND TUESDAY NIGHT...A SOUTHERLY FLOW AHEAD OF AN APPROACHING UPPER LEVEL TROUGH WILL TRANSPORT BETTER MOISTURE INTO THE NORTHERN ROCKIES REGION DURING THE AFTERNOON. THIS MOISTURE AND INCREASED INSTABILITY WILL PROMOTE THE DEVELOPMENT OF LATE DAY THUNDERSTORMS...WITH CONVECTIVE ACTIVITY PERSISTING WELL AFTER DARK. WEDNESDAY THROUGH THURSDAY NIGHT...AN INITIAL WAVE OF ENERGY WILL PASS THROUGH NORTHERN IDAHO AND WESTERN MONTANA WEDNESDAY... FOLLOWED BY A STRONGER MUCH COOLER TROUGH OF LOW PRESSURE THURSDAY. A CHANCE OF SHOWERS WILL REMAIN IN THE FORECAST WITH MUCH COOLER TEMPERATURES AND BREEZY CONDITIONS ON TAP. FRIDAY THROUGH SATURDAY...MEDIUM RANGE MODELS DIVERGE IN THEIR RESPECTIVE SOLUTIONS FOR THIS PERIOD. A WEST TO SOUTHWEST FLOW ALOFT WILL LIKELY PROVIDE A WARMING TREND WITH LOW CHANCES FOR PRECIPITATION. DUE TO LOWER CONFIDENCE IN MODELS...VERY FEW CHANGES WERE MADE TO THIS FORECAST PERIOD. && .AVIATION...SHOWERS AND THUNDERSTORMS WILL INCREASE IN COVERAGE AND INTENSITY OVER THE NORTHERN ROCKIES THROUGH 17/0600Z. STORMS WILL SPREAD SOUTH TO NORTH...STARTING NEAR KSMN AND IN CENTRAL IDAHO BEFORE EXPANDING NORTHWARD THROUGH THE AFTERNOON. IMPACTS FROM STORMS WILL BE GUSTY ERRATIC WINDS AND THE POSSIBILITY OF SMALL HAIL AS WELL. BRIEF BURSTS OF RAINFALL WILL ALSO BE COMMON...CAUSING QUICK REDUCTIONS IN VISIBILITY. TERRAIN WILL BE OCCASIONALLY OBSCURED BY CUMULONIMBUS AND INTENSE RAIN SHAFTS. STORMS ARE LIKELY TO CONTINUE THIS EVENING AND INTO THE EARLY MORNING BEFORE DECREASING AROUND 17/0600Z THROUGH 17/0900Z. NON CONVECTIVE SHOWERS WILL REMAIN...MOSTLY OVER THE HIGHER TERRAIN. && NOTE: FLOOD WATCHES...WARNINGS AND ADVISORIES WILL NOT BE LISTED BELOW. .MSO WATCHES/WARNINGS/ADVISORIES... MT...NONE. ID...NONE. && SHORT TERM...ALLEGRETTO LONG TERM....MSJ AVIATION...NOLTE
In the hours before
Special weather statement, Jul 16, 1:47 PM PDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 247 PM MDT SAT JUL 16 2011 IDZ006-162145- SOUTHERN CLEARWATER MOINTAINS- 147 PM PDT SAT JUL 16 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN IDAHO COUNTY UNTIL 245 PM PDT... AT 143 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 17 MILES SOUTHEAST OF LOWELL...OR 38 MILES SOUTHEAST OF KAMIAH...MOVING NORTHEAST AT 45 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH BRIEF BUT HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE US HIGHWAY 12 AND MAINLY RURAL AREAS OF NORTHERN IDAHO COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. && LAT...LON 4654 11518 4637 11453 4588 11530 4598 11549 TIME...MOT...LOC 2046Z 203DEG 38KT 4601 11531
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 8:11 PM PDT | Special Weather Statement | MSO | Ravalli | 49 min |
| Jul 16, 2:32 PM PDT | Special Weather Statement | MSO | Ravalli | 43 min |
| Jul 16, 3:39 PM PDT | Special Weather Statement | MSO | Missoula | 51 min |
| Jul 16, 2:00 PM PDT | Areal Flood Advisory | MSO | Lemhi | 2 hr |
Nearby
Special Weather Statements in Idaho, 2011Every special weather statement in 2011
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.