Alert archive / Montana / Special Weather Statements in 2011
Special Weather Statement, NWS Great Falls, MT
NWS Great Falls, MT issued this special weather statement at Jul 12, 2011, 2:20 PM MDT. It was in force for 40 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 12, 2011, 2:20 PM MDT (20:20 UTC)
- Expired
- Jul 12, 2011, 3:00 PM MDT
- In force
- 40 min
- Issued by
- NWS Great Falls, MT
The radar
The Missoula radar (KMSX), 173 km from the middle of the area, began a volume at 20:21 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
Boise Airport, ID (KBOI), launched 12:00Z, 8.3 hours before the alert went out and 299 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
- 2316 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- 83 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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Jul 12, 1:53 PM MDT, 27 minutes earlier.
Area forecast discussion, Jul 12, 1:53 PM MDT, 27 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 153 PM MDT TUE JUL 12 2011 .UPDATE... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE MAJORITY OF THE FORECAST AREA UNTIL 9 PM MDT THIS EVENING. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. && .AVIATION... UPDATED 1737Z. LIGHT WINDS ACROSS THE REGION LATE THIS MORNING WITH MOSTLY CLEAR SKIES...OUTSIDE OF KCTB WHERE SOME LOWER CIGS ALREADY EXIST. BIGGEST CONCERN THROUGH THE PERIOD WILL BE FOR THE NUMEROUS THUNDERSTORMS THAT WILL DEVELOP THIS AFTERNOON AND EVENING. STRONG GUSTY WINDS WILL BE EXPECTED IN AND NEAR THESE STORMS...WITH OUTFLOWS FROM THE STORMS POSSIBLE KEEPING THE WINDS THIS EVENING GUSTY AT TIMES. LOWER VSBYS WILL BE OF CONCERN AS WELL IN THESE STORMS DUE TO BRIEF HEAVY RAIN...HAVE NOT MENTIONED IN TAFS AS YET DUE TO NOT KNOWING EXACTLY WHERE THESE STORMS WILL DEVELOP. PEAK TIME FOR THUNDERSTORMS WILL BETWEEN 23Z AND 5Z ACROSS THE REGION. CLEARING OVERNIGHT WITH CALMER WINDS AS STORMS MOVE OUT OF AREA AS WELL AS DISSIPATE. -SCHOTT && .PREV DISCUSSION... /ISSUED 105 PM MDT TUE JUL 12 2011/ TONIGHT THROUGH THURSDAY...THUNDERSTORMS SOME STRONG TO SEVERE ARE EXPECTED THIS AFTERNOON AND EVENING WITH STRONG WINDS AND LARGE HAIL THE PRIMARY THREATS. STORMS WILL GENERALLY MOVE FROM SOUTHWEST TO NORTHEAST WITH DIFFLUENT FLOW ALOFT AS A DEEPENING UPPER-LEVEL LOW SPINS OVER THE PACIFIC NORTHWEST. SHORTWAVE ENERGY ROTATING AROUND THE LOW WILL PROVIDE DECENT LIFT TO SUPPORT CONVECTION POTENTIAL. DEW POINT VALUES IN THE 50S TO NEAR 60 ARE ALSO SUPPORTING SUFFICIENT MOISTURE FOR HEAVY RAINFALL. STORMS WILL DIMINISH AFTER MIDNIGHT WITH PARTLY CLOUDY SKIES EXPECTED THROUGH WEDNESDAY MORNING. UNSTABLE SOUTHWEST FLOW ALOFT AND MOIST EASTERLY SURFACE FLOW WILL PERSIST INTO WEDNESDAY GIVING THE POTENTIAL FOR ADDITIONAL THUNDERSTORMS...SOME STRONG TO SEVERE IN THE AFTERNOON AND EVENING ON WEDNESDAY. UNSETTLED CONDITIONS WILL CONTINUE ON THURSDAY AND TEMPERATURES WILL REMAIN 5 TO 10 DEGREES ABOVE SEASONAL AVERAGES. MLS THURSDAY NIGHT THROUGH TUESDAY...EXPECT AN UNSETTLED WEATHER PATTERN TO CONTINUE TO RESIDE OVER THE REGION THROUGH FRIDAY NIGHT...THEN THE FIRST FAIRLY STRONG UPPER LEVEL RIDGE OF HIGH PRESSURE OF THE SUMMER SEASON WILL START TO BUILD OVER THE AREA FROM SATURDAY AFTERNOON THROUGH TUESDAY. SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED OVER THE REGION ON THURSDAY NIGHT...WITH THE THUNDERSTORM ACTIVITY SLOWLY DIMINISHING IN COVERAGE AREA BY SATURDAY MORNING. THEN FROM SATURDAY AFTERNOON THROUGH TUESDAY...MOST OF THE THUNDERSTORM ACTIVITY WILL BE CONFINED TO THE MOUNTAINS...BUT AN ISOLATED THUNDERSTORM IS POSSIBLE OVER THE PLAINS FROM TIME TO TIME. EXPECT TEMPERATURES TO START A SLOW WARMING TREND...WITH AFTERNOON HIGHS NEAR NORMAL ON SATURDAY...RISING TO NEARLY 10 DEGREES ABOVE NORMAL BY NEXT TUESDAY. OVERNIGHT LOWS WILL ALSO START TO WARM...AND SHOULD AVERAGE CLOSE TO 5 DEGREES ABOVE NORMAL BY TUESDAY MORNING AS WELL. BRUSDA && .PRELIMINARY POINT TEMPS/POPS... GTF 58 86 56 80 / 60 40 50 30 CTB 55 80 54 76 / 50 40 50 30 HLN 57 86 56 81 / 40 40 40 30 BZN 54 88 52 85 / 40 30 20 20 WEY 43 76 42 74 / 60 20 30 20 DLN 53 82 51 79 / 40 20 20 30 HVR 61 88 59 84 / 60 30 40 30 LWT 57 85 56 82 / 60 30 30 20 && .TFX WATCHES/WARNINGS/ADVISORIES... SEVERE THUNDERSTORM WATCH UNTIL 9 PM MDT THIS EVENING BEAVERHEAD...BLAINE...BROADWATER...CASCADE...CENTRAL AND SOUTHERN LEWIS AND CLARK...CHOUTEAU...EASTERN PONDERA...EASTERN TETON...FERGUS...GALLATIN...HILL...JEFFERSON...JUDITH BASIN... LIBERTY...MADISON...MEAGHER...NORTHERN ROCKY MOUNTAIN FRONT... SOUTHERN ROCKY MOUNTAIN FRONT...TOOLE. && WEATHER.GOV/GREATFALLS
Hazardous weather outlook, Jul 12, 1:51 PM MDT, 29 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 151 PM MDT TUE JUL 12 2011 MTZ008-011-013>015-044>055-132000- BEAVERHEAD-HILL-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK- MADISON-TOOLE-LIBERTY-EASTERN PONDERA-BLAINE- SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON-JUDITH BASIN-FERGUS- JEFFERSON-BROADWATER-MEAGHER-GALLATIN- 151 PM MDT TUE JUL 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM MDT THIS EVENING. WIDESPREAD THUNDERSTORM ACTIVITY IS EXPECTED THIS AFTERNOON AND EVENING. SOME OF THESE STORMS MAY BE SEVERE WITH LOCALLY HEAVY RAINFALL...HAIL AND GUSTY DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL REDEVELOP EACH AFTERNOON FROM WEDNESDAY THROUGH FRIDAY...SOME OF WHICH WILL PRODUCE SMALL HAIL AND STRONG WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED TUESDAY AFTERNOON AND EVENING DUE THE POSSIBILITY OF SEVERE WEATHER. SPOTTERS ARE ENCOURAGED TO MAKE TIMELY REPORTS OF LARGE HAIL...STRONG WINDS OR FLASH FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN GREAT FALLS. MTZ009-010-132000- NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER- 151 PM MDT TUE JUL 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT WIDESPREAD THUNDERSTORM ACTIVITY IS EXPECTED THIS AFTERNOON AND EVENING. SOME OF THESE STORMS MAY BE STRONG WITH LOCALLY HEAVY RAINFALL...SMALL HAIL AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL REDEVELOP EACH AFTERNOON FROM WEDNESDAY THROUGH FRIDAY...SOME OF WHICH WILL PRODUCE SMALL HAIL AND STRONG WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TUESDAY AFTERNOON AND EVENING DUE THE POSSIBILITY OF SEVERE WEATHER. SPOTTERS ARE ENCOURAGED TO MAKE TIMELY REPORTS OF LARGE HAIL...STRONG WINDS OR FLASH FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN GREAT FALLS. MTZ012-132000- CASCADE- 151 PM MDT TUE JUL 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM MDT THIS EVENING. WIDESPREAD THUNDERSTORM ACTIVITY IS EXPECTED THIS AFTERNOON AND EVENING. SOME OF THESE STORMS MAY BE SEVERE WITH LOCALLY HEAVY RAINFALL...HAIL AND GUSTY DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE MISSOURI RIVER IS FORECAST TO DROP BELOW FLOOD STAGE BY EARLY WEDNESDAY. THE FLOOD WARNING WILL REMAIN IN EFFECT UNTIL THE RIVER LEVEL IS EXPECTED TO STAY BELOW FLOOD STAGE. THUNDERSTORMS WILL REDEVELOP EACH AFTERNOON FROM WEDNESDAY THROUGH FRIDAY...SOME OF WHICH WILL PRODUCE SMALL HAIL AND STRONG WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED TUESDAY AFTERNOON AND EVENING DUE THE POSSIBILITY OF SEVERE WEATHER. SPOTTERS ARE ENCOURAGED TO MAKE TIMELY REPORTS OF LARGE HAIL...STRONG WINDS OR FLASH FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN GREAT FALLS.
In the hours before
Special weather statement, Jul 12, 12:55 PM MDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1255 PM MDT TUE JUL 12 2011
MTZ008-121945-
BEAVERHEAD MT-
1255 PM MDT TUE JUL 12 2011
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BEAVERHEAD COUNTY UNTIL
145 PM MDT...
AT 1252 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 19 MILES NORTHEAST OF LEMHI...OR 25 MILES EAST
OF SALMON...MOVING NORTHEAST AT 20 MPH.
HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.
* LOCATIONS IMPACTED INCLUDE...
RURAL WESTERN BEAVERHEAD COUNTY...
RURAL CENTRAL BEAVERHEAD COUNTY...
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 4543 11329 4527 11293 4497 11336 4502 11346
4505 11346 4506 11350 4509 11352 4511 11353
TIME...MOT...LOC 1855Z 216DEG 17KT 4509 11339
SCHOTTSpecial weather statement, Jul 12, 1:46 PM MDT, 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 146 PM MDT TUE JUL 12 2011 MTZ008-122030- BEAVERHEAD MT- 146 PM MDT TUE JUL 12 2011 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BEAVERHEAD COUNTY UNTIL 230 PM MDT... AT 143 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 16 MILES SOUTHEAST OF JACKSON...OR 27 MILES WEST OF DILLON...MOVING NORTHEAST AT 15 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. * LOCATIONS IMPACTED INCLUDE... POLARIS... 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 4554 11306 4529 11274 4509 11319 4523 11335 TIME...MOT...LOC 1947Z 232DEG 13KT 4521 11317 SCHOTT
Special weather statement, Jul 12, 2:20 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
220 PM MDT TUE JUL 12 2011
MTZ008-122100-
BEAVERHEAD MT-
220 PM MDT TUE JUL 12 2011
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BEAVERHEAD COUNTY
UNTIL 300 PM MDT...
AT 215 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES EAST OF SALMON...MOVING NORTH AT 35 MPH.
HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.
* LOCATIONS IMPACTED INCLUDE...
JACKSON...
WISDOM...
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 4581 11366 4565 11316 4516 11357 4531 11373
4533 11374
TIME...MOT...LOC 2021Z 194DEG 32KT 4528 11366
SCHOTTThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 6:57 PM MDT | Special Weather Statement | TFX | 48 min | |
| Jul 12, 12:55 PM MDT | Special Weather Statement | TFX | Beaverhead | 50 min |
| Jul 12, 1:46 PM MDT | Special Weather Statement | TFX | Beaverhead | 44 min |
| Jul 12, 2:38 PM MDT | Special Weather Statement | TFX | Broadwater | 52 min |
| Jul 12, 2:47 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 58 min |
| Jul 12, 2:55 PM MDT | Flash Flood Watch | TFX | 6 hr | |
| Jul 12, 3:16 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 44 min |
| Jul 12, 3:54 PM MDT | Special Weather Statement | TFX | Judith Basin | 51 min |
| Jul 12, 3:56 PM MDT | Special Weather Statement | TFX | Cascade | 49 min |
| Jul 12, 4:00 PM MDT | Special Weather Statement | TFX | Lewis and Clark | 45 min |
| Jul 12, 4:46 PM MDT | Special Weather Statement | TFX | Judith Basin | 44 min |
| Jul 12, 5:58 PM MDT | Special Weather Statement | TFX | Beaverhead | 77 min |
Nearby
Special Weather Statements in Montana, 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.