Alert archive / Montana / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 19, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Jun 21, 2003, 9:32 PM MDT for Carter 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 counties it named.
The facts
- Issued
- Jun 21, 2003, 9:32 PM MDT (03:32 UTC)
- Expired
- Jun 21, 2003, 10:30 PM MDT
- In force
- 58 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Carter County, MT
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 3.5 hours before the alert went out and 207 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
- 911 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1714 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.5
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 Jun 21, 8:58 PM MDT, 34 minutes earlier.
Area forecast discussion, Jun 21, 8:58 PM MDT, 34 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
858 PM MDT SAT JUN 21 2003
.SHORT TERM...VALID FOR SUN AND MON...
UPDATE TO ZFP. NO UPDATE TO AFP. UPPER LEVEL JET CENTERED OVER UT THIS
EVE WAS BRINGING UPPER LEVEL DIVERGENCE TO EASTERN PORTION OF FORECAST
AREA. MEANWHILE UPPER LOW SPINNING OVER SOUTHERN ALBERTA WILL CONTINUE
SENDING VORT ENERGY ACROSS THE AREA OVERNIGHT THROUGH AT LEAST SUN.
SHOWERS AND THUNDERSTORMS CONTINUED MOVING NE THROUGH THE AREA THIS
EVENING. COLD AIR ALOFT WAS CAUSING STORMS TO PRODUCE SMALL HAIL. EXPECT
INTENSITY OF PRECIPITATION TO DECREASE AFTER SUNSET. WILL UPDATE
FORECAST TO ADJUST POP COVERAGE OVERNIGHT. WILL HAVE CHANCE FOR
THUNDERSTORMS OVER ENTIRE AREA THROUGH MIDNIGHT THEN WILL TAPER OFF
CHANCES FROM W TO E. WILL HAVE JUST A CHANCE OF SHOWERS E AFTER 09Z.
SUNDAY SHOULD BE SIMILAR TO TODAY AS UPPER LOW SLIDES E AND LAPSE RATES
REMAIN STEEP. ANOTHER JET WILL MOVE E FROM THE PACIFIC COAST BRINGING
LIFT TO THE AREA LATE IN THE DAY.
TEMPS OVERNIGHT LOOKED FINE BASED ON CURRENT OBSERVATIONS. SURFACE
HIGH PRESSURE WILL BUILD E OVERNIGHT WHICH SHOULD KEEP WINDS UP A
LITTLE OVER THE REGION. COMBINATION OF SOME CLOUD COVER AND WIND SHOULD
KEEP TEMPS FROM FALLING BELOW FORECAST LOWS. ARTHUR
.LONG TERM...VALID FOR TUE...WED...THU...FRI...SAT...
GFS DEVELOPING SOUTHWEST FLOW BY MONDAY AS ENERGY SPLITS OFF MAIN LOW
OVER ALBERTA AND CLOSES OFF IN IDAHO. SEVERAL WAVES PROGGED TO SPIN
INTO EASTERN ZONES TUESDAY...WITH UPPER TROUGH MOVING THROUGH
WEDNESDAY. BEST DAYS FOR ANY THUNDERSTORM ACTIVITY LOOK TUESDAY AND
WEDNESDAY. WILL LET POPS RIDE FOR THURSDAY AS GFS MAY BE TOO FAST WITH
SYSTEM AND UNCERTAIN ABOUT THIS. FRIDAY AND SATURDAY LOOK TO BE WARMER
AND DRY WITH NORTHWEST FLOW AND RISING HEIGHTS. NO BIG CHANGES TO GOING
EXTENDED FORECAST. SCARLETT
SUN MON TUE WED THU FRI SAT
-----------------------------------------------------------
BIL 049/069 048/072 050/069 051/070 051/073 051/076 050/080
33/T 03/T 33/T 33/T 33/T 00/U 00/B
LVM 041/063 041/066 043/065 045/068 046/071 046/074 048/078
32/T 04/T 43/T 33/T 34/T 00/U 00/B
HDN 048/070 047/073 051/070 050/070 052/073 052/076 051/080
33/T 23/T 44/T 43/T 33/T 00/U 00/B
MLS 050/071 047/073 050/072 052/071 052/074 052/077 051/081
34/T 40/B 44/T 43/T 33/T 00/U 00/B
4BQ 049/073 048/073 050/073 051/070 051/073 050/077 049/081
44/T 43/T 44/T 43/T 33/T 00/U 00/B
BHK 049/071 046/070 048/071 051/069 050/072 050/075 049/079
44/T 40/B 44/T 43/T 33/T 00/U 00/B
SHR 046/071 045/072 049/071 048/068 048/069 048/075 047/079
33/T 23/T 34/T 43/T 33/T 00/U 00/BHazardous weather outlook, Jun 21, 5:10 AM MDT, 16 hours 22 minutes before
MTZ028>042-056>058-WYZ098-099-221100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BILLINGS MT 510 AM MDT SAT JUN 21 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL...SOUTHEAST MONTANA AND NORTH CENTRAL WYOMING. .DAY ONE... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. HUMPHREY
The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 2:50 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 55 min |
| Jun 22, 3:04 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 56 min |
| Jun 22, 4:01 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 44 min |
| Jun 22, 4:43 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 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.