Alert archive / Montana / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 99, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Jul 27, 2002, 1:43 PM MDT for Sweet Grass County, Montana. It was in force for 62 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
- Jul 27, 2002, 1:43 PM MDT (19:43 UTC)
- Expired
- Jul 27, 2002, 2:45 PM MDT
- In force
- 62 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Sweet Grass County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.7 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
- 9 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1136 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Jul 27, 8:56 AM MDT, 4 hours 47 minutes earlier.
Area forecast discussion, Jul 27, 8:56 AM MDT, 4 hours 47 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
856 AM MDT SAT JUL 27 2002
.SHORT TERM...VALID FOR TDY...SUN...MON...
UPDATES PLANNED TO ZONES THIS MORNING. UNSETTLED WEATHER CONTINUES TO
DEVELOP WEST OF BILLINGS COUNTY WARNING AREA AND IS MOVING EAST. AREA OF
SHOWERS/THUNDERSTORMS PROGRESSIVELY MOVING TOWARD THE BILLINGS AREA AND
WILL UPDATE POPS TO LIKELY CATEGORY. 8AM TEMPS IN THE 60S TO LOWER 70S
ACROSS SC/SE MT AND SHR CO WY. FORECAST HIGHS IN THE LOWER TO MID 80S
REASONABLE GIVEN PRESENT CLOUD COVER AND EXPECTED PRECIPITATION TODAY IN
THE EAST. WILL TWEAK TEMPS DOWN A COUPLE DEGREES FOR LOCATIONS WEST OF
BIL WHERE CLOUD COVER IS THICKER AND PRECIPITATION ALREADY OCCURRING.
WINDS PRIMARILY W/NW AS FORECAST AND WILL ONLY MAKE SLIGHT ADJUSTMENTS
TO SHR WHERE WINDS HAVE YET TO SHIFT. SPRINGER
.LONG TERM...VALID FOR TUE...WED...THU...FRI...
UPPER LEVEL LOW ACROSS BRITISH COLUMBIA DROPS SOUTH ALONG THE COAST
TUESDAY...WITH NORTHWEST FLOW TRANSITIONING TO SOUTHWEST FLOW BY
WEDNESDAY. LATEST AVIATION RUN DEVIATES FROM THIS SOLUTION...PRODUCING
STRONGER ZONAL FLOW ACROSS THE AREA. HAVE LOW CONFIDENCE IN LATEST
AVIATION SOLUTION...SINCE PREVIOUS EXTENDED AVIATION...ECMWF...AND
NOGAPS RUNS SHOWED GOOD AGREEMENT. LATEST UKMET DOES NOT DROP THE UPPER
LOW SOUTH ALONG THE COAST UNTIL WEDNESDAY...BUT EVENTUALLY DOES
TRANSITION TO SOUTHWEST FLOW ACROSS THE CWA BY EARLY THURSDAY. GOING
FORECAST LOOKS GOOD WITH SCATTERED POPS FOR THURSDAY AND FRIDAY AS UPPER
LEVEL SHORTWAVE ENERGY AND ASSOCIATED SURFACE COLD FRONT WORK ACROSS THE
CWA. FRIDAY HIGH TEMPERATURES MAY BE TOO COOL AS EXTENDED AVIATION
INDICATES SLIGHT WARMING AT 850MB AND 700MB...BUT WILL NOT MAKE CHANGES
THIS PACKAGE. CARPENTER
TDY SUN MON TUE WED THU FRI
-------------------------------------------------------
BIL 079 054/080 054/085 059/085 058/087 056/083 056/078
6/T 40/B 00/B 00/B 00/B 03/T 33/T
LVM 077 048/079 048/083 055/083 054/085 052/078 052/073
6/T 40/B 00/B 00/B 00/B 03/T 33/T
HDN 081 052/082 052/087 057/087 056/088 054/085 054/080
6/T 42/W 00/B 00/B 00/B 03/T 33/T
MLS 083 055/080 052/087 059/087 058/089 056/084 056/079
4/T 42/W 20/B 00/B 00/B 03/T 33/T
4BQ 084 055/081 053/086 058/086 058/088 056/083 056/078
4/T 42/W 00/B 00/B 00/B 03/T 33/T
BHK 082 053/079 050/085 055/085 056/087 054/080 054/075
4/T 42/W 20/B 00/B 00/B 03/T 33/T
SHR 083 053/081 051/086 055/086 055/087 053/081 053/076
4/T 42/W 00/B 00/B 00/B 03/T 33/T
.BYZ...
MT...NONE.
WY...NONE.The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 1:52 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 53 min |
| Jul 27, 3:23 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 67 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning in 2002
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.