Alert archive / Montana / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 96, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 12, 2003, 8:47 PM MDT for Chouteau County, Hill County, Montana. 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
- Aug 12, 2003, 8:47 PM MDT (02:47 UTC)
- Expired
- Aug 12, 2003, 9:45 PM MDT
- In force
- 58 min
- Issued by
- NWS Great Falls, MT
- Area
- Counties, with a storm outline in the text
Counties Chouteau County, MT, Hill County, MT
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 2.8 hours before the alert went out and 90 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
- 3243 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 248 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS55 KTFX 130247
SVRTFX
MTC015-041-130345-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
846 PM MDT TUE AUG 12 2003
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA
SOUTHWESTERN HILL COUNTY IN NORTH CENTRAL MONTANA
* UNTIL 945 PM MDT
* AT 843 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER NORTH CENTRAL CHOUTEAU COUNTY...OR ABOUT
23 MILES NORTH OF FORT BENTON...MOVING NORTHEAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL MOVE OVER...
RURAL NORTHERN CHOUTEAU COUNTY AT 850 PM MDT
RURAL SOUTHWESTERN HILL COUNTY AT 900 PM MDT
RURAL SOUTHERN HILL COUNTY AT 920 PM MDT
THIS STORM HAS A HISTORY OF PRODUCING QUARTER SIZE HAIL.
IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND
VERY HEAVY RAIN.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREAT FALLS.
LAT...LON 4812 11083 4804 11076 4826 11026 4854 11054
4847 11073 4831 11067What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 12, 2:40 PM MDT, 6 hours 7 minutes earlier.
Area forecast discussion, Aug 12, 2:40 PM MDT, 6 hours 7 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST
NATIONAL WEATHER SERVICE GREAT FALLS MT
240 PM MDT TUE AUG 12 2003
.DISCUSSION...
SW FLOW ALOFT BRINGING ABUNDANT UPPER LEVEL MOISTURE ACROSS THE AREA
THIS EVENING ALONG WITH SHORT WAVE AND ASSOCIATED VORTICITY CENTER
THAT MAY DEVELOP THUNDERTORMS TONIGHT. INHIBITING FACTOR ACROSS
WESTERN CWA IS CLOUDS AND CURRENT TEMPERATURES IN THE 80S ACROSS
MUCH OF CENTRAL MONTANA. TEMPERATURES NEAR 100 EAST WILL ENHANCE
THUNDERSTORMS ACTIVITY THIS EVENING. LITTLE CHANGE IN PATTERN WED...
WITH DECREASING CHANCE OF RAIN AS RIDGE STARTS TO BUILD OVER AREA.
HIGH PRESSURE CONTINUES TO BUILD OVER REGION THURSDAY AND FRIDAY
BRINGING NEAR RECORD HIGH TEMPERATURES TO THE AREA AND ONLY SLIGHT
CHANCE OF MAINLY AFTERNOON THUNDERSTORMS. STRONGER WINDS FRIDAY
AFTERNOON...20 MPH OR MORE ALONG ROCKY MOUNTAIN FRONT...WILL
COMBINE WITH HIGH TEMPERATURES AND LOW HUMIDITIES TO CREATE
PARTICULARLY DANGEROUS FIRE CONDITIONS.
FRIDAY NIGHT THROUGH SATURDAY...GFS RUN SHOWS A WAVE MOVING OVER THE
TOP OF THE RIDGE FRIDAY EVENING. THE RESPONSE TO THIS WAVE WILL BE
FOR A SURFACE LOW TO FORM OVER CENTRAL AND EASTERN MONTANA/SOUTHERN
SASKATCHEWAN WHICH WILL CREATE DOWNSLOPE WINDS. WILL TEMPER THESE
WIND SPEEDS FOR NOW HOPING FOR SOME CONSISTENCY IN THE MODEL RUNS.
HOWEVER...IT COULD BE A BIT WINDY FRIDAY NIGHT AND SATURDAY.
CONSEQUENTLY...NO RAIN FOR OUR AREA FRIDAY NIGHT THROUGH SATURDAY
AND CONTINUED HOT.
DITTMANN
.SUNDAY THROUGH TUESDAY...UPPER LEVEL RIDGE REBUILDS RAPIDLY BY
SUNDAY. THE MODELS KEPT DELAYING THE COOLER WEATHER BY A DAY OVER
THE LAST 3 DAYS. THUS WILL GO WITH A RIDGE OVER THE AREA FOR
CONTINUED HOT AND DRY WEATHER THROUGH TUESDAY. WILLIAMSON DC
.CCF NUMBERS
GTF BB 057/096 059/100 061 01322
BBUUU 097/061 092/061 092/058 091/058 092 21-00000000
CTB BB 051/092 054/094 060 01222
BBUUU 093/057 089/057 083/055 088/055 089 22100000000
HLN BB 058/096 060/099 059 01321
BBUUU 099/060 094/060 091/060 093/060 092 11-00000000
BZN BB 054/099 053/100 057 01321
BBUUU 096/059 093/059 091/055 092/055 091 11000000000
WEY BB 048/091 049/093 055 01321
UUUUU 089/050 089/051 086/044 088/044 086 11011000000
DLN BB 054/097 057/099 057 01321
BUUUU 095/056 093/056 093/050 092/050 093 111--000000
HVR BB 060/100 062/102 062 01322
BBUUU 100/060 095/060 094/063 094/063 095 21100000000
LWT BB 058/098 060/100 062 01322
BBUUU 098/060 093/060 091/060 092/060 089 21-00000000
.TFX...RED FLAG WARNING TODAY THROUGH TONIGHT FOR FIRE ZONES 112...
113...114...115...116...117 AND 118.Hazardous weather outlook, Aug 12, 3:15 PM MDT, 5 hours 32 minutes before
MTZ008>015-044>055-131210- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 315 PM MDT TUE AUG 12 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND SOUTHWEST MONTANA .DAY ONE...TODAY A RED FLAG WARNING CONTINUES THROUGH THIS EVENING FOR ALL OF NORTH CENTRAL AND SOUTHWEST MONTANA FOR LOW RELATIVE HUMIDITIES...HIGH FIRE DANGERS AND GUSTY WINDS ASSOCIATED WITH A MIX OF WET AND DRY THUNDERSTORMS. PLEASE REFER TO GTFRFWTFX AND GTFRFWMSO FOR MORE INFORMATION. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY INCREASING TEMPERATURES AND LOW RELATIVE HUMIDITIES WILL CONTRIBUTE TO VERY HIGH FIRE DANGERS THROUGH AT LEAST FRIDAY. THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS EACH DAY. THEREFORE RED FLAG CONDITIONS WILL BE POSSIBLE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Local storm report, Aug 12, 8:30 PM MDT, 17 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
830 PM MDT TUE AUG 12 2003
TIME(MDT) .....EVENT LOCATION..... ST ...EVENT/REMARKS...........
.....COUNTY LOCATION.....
0815 PM 11 N CARTER MT 1 INCH HAIL
08/12/03 CHOUTEAU
NNNNThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:02 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 43 min |
| Aug 12, 9:03 PM MDT | Severe Thunderstorm Warning | TFX | Teton | 42 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2003Every severe thunderstorm warning in 2003
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.