Alert archive / Montana / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 55, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Aug 11, 2003, 4:33 PM MDT for Sweet Grass County, Montana. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2003, 4:33 PM MDT (22:33 UTC)
- Expired
- Aug 11, 2003, 5:30 PM MDT
- In force
- 57 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Sweet Grass County, MT
The radar
The Billings radar (KBLX), 103 km from the middle of the area, began a volume at 22:34 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
Great_falls, MT (KTFX), launched 12:00Z, 10.6 hours before the alert went out and 190 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
- 4296 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What 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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 3:11 PM MDT, 1 hour 22 minutes earlier.
Area forecast discussion, Aug 11, 3:11 PM MDT, 1 hour 22 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
311 PM MDT MON AUG 11 2003
.SHORT TERM...VALID FOR TUE AND WED...
CONTINUED HOT WEATHER IN STORE THE NEXT COUPLE OF DAYS AS HIGH PRESSURE
RIDGE MOVES VERY LITTLE AND A WEAK FRONT TRIES TO MOVE THROUGH THE
REGION. TEMPERATURES WILL REMAIN STEADY OR FALL SLIGHTLY INTO THE
MID/UPPER 90S TUE AS A WEAK FRONT MOVES THROUGH BETWEEN 12Z-18Z...YET
READINGS WILL REBOUND TO THE UPPER 90S/LOWER 100S WED. WEAK UPPER LEVEL
DISTURBANCES CONTINUE TO MOVE THROUGH AN UPPER SOUTHWEST FLOW PATTERN
WHILE WINDS AT THE SURFACE WILL SHIFT TO THE NORTH ON TUE AND THEN BACK
TO THE WEST BY WED. DRY THUNDERSTORMS WILL LIKELY BE THE RESULT WITH
GUSTY WINDS IF DEVELOPMENT TRULY OCCURS AS UPPER LEVEL DISTURBANCES
PASS OVER THE REGION. OTHERWISE WILL GO WITH A STATUS QUO FORECAST.
SPRINGER
.LONG TERM...VALID FOR THU...FRI...SAT...SUN...MON...
UPPER RIDGE AXIS SHIFTS INTO THE NORTHERN PLAINS FOR THURSDAY AS A
TROUGH IS FORECAST TO MOVE INTO THE PACNW. THE TROUGH IS THEN
FORECAST TO MOVE TROUGH SOUTHERN CANADA AND PUSH A WEAK COLD FRONT
THROUGH THE CWA SATURDAY. 00Z GFS WAS A LITTLE DEEPER WITH THE TROUGH
THAN THE NEW 12Z RUN. GFS ENSEMBLES ALSO HINT THE WAVE MAY BE WEAKER
AND THE ECMWF KEEPS THE WAVE WELL TO THE NORTHWEST. SO THE FORECAST COOL
DOWN MAY BE TOO MUCH...BUT VALUES ARE CURRENTLY AT OR ABOVE MODEL
GUIDANCE. WILL LEAVE THE NUMBERS ALONE...BUT LATER SHIFTS MAY NEED TO
NUDGE THE VALUES BACK CLOSER TO PERSISTANCE. MORE ZONAL FLOW IS
FORECAST BY THE GFS/ECMWF INTO MONDAY...BUT AGAIN THE ENSEMBLES INDICATE
A WEAK RIDGE AND WARMER TEMPERATURES. FORECAST FOR SUN AND MONDAY ARE
STILL FOR ABOVE NORMAL TEMPERATURES WHICH IS REASONABLE. CHANCE OF RAIN
DOESNT LOOK THAT GREAT THU THROUGH MONDAY. BEST SHOT SEEMS TO BE FRIDAY
WITH THE FRONTAL PASSAGE...BUT MOISTURE LOOKS PRETTY SLIM. WILL KEEP
POPS OUT OF THE FORECAST...BUT COULD SEE AN ISOLATED STORM OR TWO
FRIDAY. MOORE
TUE WED THU FRI SAT SUN MON
-----------------------------------------------------------
BIL 069/099 067/099 069/098 064/090 063/088 061/089 061/090
32/T 20/G 00/G 00/G 00/B 00/B 00/G
LVM 055/095 054/095 052/091 051/087 051/084 051/085 052/086
33/T 32/T 20/G 00/B 00/U 00/B 00/B
HDN 067/101 065/101 067/100 062/092 061/089 059/091 059/092
32/T 20/G 00/G 00/G 00/B 00/G 00/G
MLS 069/101 067/101 067/101 062/092 061/089 059/089 059/091
20/G 20/G 00/G 00/G 00/B 00/B 00/G
4BQ 069/101 067/101 065/098 059/091 060/088 058/088 058/091
32/T 20/G 00/G 00/G 00/B 00/B 00/G
BHK 065/098 064/098 064/095 058/088 059/086 057/086 057/088
20/G 20/G 00/G 00/B 00/B 00/B 00/B
SHR 059/099 057/099 062/099 057/090 059/088 056/089 057/090
22/T 20/G 00/G 00/G 00/B 00/B 00/G
.BYZ...
MT...NONE.
WY...NONE.Hazardous weather outlook, Aug 11, 4:32 PM MDT, 1 minute before
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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; radar from the NEXRAD Level II archive.