Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 62, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Jun 29, 2002, 5:33 PM MDT for Sheridan County, Wyoming. It was in force for 57 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 29, 2002, 5:33 PM MDT (23:33 UTC)
- Expired
- Jun 29, 2002, 6:30 PM MDT
- In force
- 57 min
- Issued by
- NWS Billings, MT
- Area
- Counties, with a storm outline in the text
County Sheridan County, WY
The radar
The Billings radar (KBLX), 180 km from the middle of the area, began a volume at 23:32 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 29, 5:48 PM MDT | Thunderstorm Wind 50 M | Sheridan Arpt, WY |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.6 hours before the alert went out and 382 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
- 80 J/kg
- Mixed-layer CIN
- -468 J/kg
- Mixed-layer LCL
- 2641 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 89 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 Jun 29, 2:35 PM MDT, 2 hours 58 minutes earlier.
Area forecast discussion, Jun 29, 2:35 PM MDT, 2 hours 58 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
235 PM MDT SAT JUN 29 2002
.SHORT TERM...VALID FOR SUN...MON...TUE...
COLD FRONT WILL MAKE FOR ACTIVE EVENING TONIGHT ACROSS CWA...WITH
THUNDERSTORMS ALREADY FIRING IN WESTERN ZONES. AFTER FRONTAL PASSAGE
THROUGH CWA TONIGHT UPPER FLOW WILL BECOME ZONAL...RESULTING IN QUIET
WEATHER THROUGH THE REST OF THE SHORT TERM.
TONIGHT...MAIN CONCERN TONIGHT WILL BE THUNDERSTORMS AND PERIOD OF
STRONG WINDS BEHIND THE FRONT. THUNDERSTORMS ALREADY BEGINNING TO FIRE
IN WEST WHERE APPROACHING SHORTWAVE TROUGH AND FRONT IS BEGINNING TO
ERODE THE CAP. FURTHER EAST VERY WARM 700MB TEMPS STILL IN PLACE. THIS
WILL LIMIT CONVECTIVE ACTIVITY IN THIS AREA...BUT LIFT JUST AHEAD OF
THE FRONT SHOULD BE ENOUGH TO FIRE STORMS AS CAP ERODES. WILL CONTINUE
WITH SEVERE WORDING THIS EVENING AS CONDITIONS MOST FAVORABLE FOR
STRONG WINDS WITH STORMS...AS LARGE DEW POINT DEPRESSIONS AND HIGH WET
BULB ZERO HEIGHTS WILL LIMIT HAIL POTENTIAL. STORMS WILL CLEAR FROM
WEST TO EAST TONIGHT AND SHOULD BE OUT OF EASTERN ZONES BY AROUND 06Z...
AND WILL WORD ACCORDINGLY. BEHIND FRONT WINDS WILL SWITCH TO THE
NORTHWEST AND REACH WINDY CRITERIA OVER CENTRAL AND EAST. WINDS WILL
DIMINISH ACROSS CENTRAL BY MIDNIGHT BUT SHOULD CONTINUE IN EAST MOST
OF THE NIGHT AS COLD AIR ADVECTION/SUBSIDENCE BEHIND FRONT PUSH STRONG
850MB WINDS TOWARD SURFACE.
SUNDAY THROUGH MONDAY...MUCH MORE QUIET PATTERN SETTING UP FOR SUNDAY
AND MONDAY AS UPPER LEVEL ZONAL FLOW SETS UP BEHIND TROUGH. SOME
SHORTWAVE ENERGY PUSHES THROUGH LATE SUNDAY AFTERNOON AND EVENING...AND
ETA DEVELOPS SURFACE LOW WITH THIS FEATURE. SOME INSTABILITY ALSO
EVIDENT IN THIS AREA WITH LOWERING LIS AND SOME CAPE. WILL MENTION
SLIGHT CHANCE OF STORMS FAR WEST AND NORTHWEST FOR THIS PERIOD...EVEN
THOUGH WE ARE NOT INCLUDED IN SPC GENERAL OUTLOOK. TEMPS SUNDAY WILL
MAINLY STAY BELOW THE 90 DEGREE MARK AS SOME COOLING TAKES PLACE...
ESPECIALLY EAST. MONDAY LOOKS TO BE COOLEST DAY OF FORECAST WITH
CONTINUED ZONAL FLOW.
FLOW REMAINS DRY AND ZONAL ON TUESDAY AS THE STRONGEST RIDGE
AMPLIFICATION STAYS OVER SOUTHERN CANADA. A WEAK WAVE DOES ENTER
SOUTHWEST MONTANA TUESDAY AFTERNOON...BUT THE ATMOSPHERE IS FORECAST TO
BE TO DRY TO WARRANT PLACING IN POPS. HIGHS ON TUESDAY SHOULD BE NEAR
THE LEVELS OF MONDAY...SO WILL RAISE GOING HIGHS. JZ/HUMPHREY
.LONG TERM...VALID FOR WED...THU...FRI...SAT...
RIDGE BUILDS UP OVER THE CENTRAL PLAINS AGAIN AND ALLOWS A DEEP UPPER
LOW TO MOVE INTO THE PACIFIC NORTHWEST COAST. THIS WILL SET UP SOUTHWEST
FLOW OVER THE FORECAST AREA. THIS PATTERN IS FAVORABLE FOR CONVECTION.
ATMOSPHERE APPEARS A LITTLE DRY AT FIRST...BUT MOISTENS UP IN TIME. THE
EXTENDED AVN PULLS THE UPPER TROUGH NORTHEAST ON SATURDAY. THIS IS QUITE
A BIT FASTER THAN THE ECMWF. WILL KEEP THE MENTION OF THUNDERSTORMS
WEDNESDAY THROUGH SATURDAY. A COLD FRONT IS PROGGED TO SLIDE THROUGH THE
AREA BY FRIDAY. THIS WILL COOL THINGS DOWN SOME FRIDAY INTO SATURDAY.
HUMPHREY
SUN MON TUE WED THU FRI SAT
-----------------------------------------------------------
BIL 056/087 059/084 057/084 057/087 059/087 056/082 054/082
40/B 00/B 00/B 03/T 33/T 33/T 33/T
LVM 053/087 057/083 054/083 054/086 056/086 053/080 051/080
22/T 20/B 00/B 03/T 33/T 33/T 33/T
HDN 055/089 057/082 055/082 055/088 057/090 054/085 052/083
40/U 00/B 00/B 03/T 33/T 33/T 33/T
MLS 062/088 062/085 059/085 059/088 061/090 059/085 056/083
60/U 00/B 00/B 03/T 33/T 33/T 33/T
4BQ 058/089 060/085 058/085 058/088 060/090 059/085 056/083
40/U 00/B 00/B 03/T 33/T 33/T 33/T
BHK 057/085 057/083 056/083 056/086 058/088 058/083 055/081
60/U 00/B 00/B 03/T 33/T 33/T 33/T
SHR 056/087 055/084 053/084 053/087 055/089 053/085 051/082
40/U 00/B 00/B 03/T 33/T 33/T 33/T
.BYZ...
MT...SEVERE THUNDERSTORM WATCH UNTIL 8PM MDT FOR ALL BUT PARK COUNTY.
WY...NONE.The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 6:53 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 52 min |
| Jun 28, 7:07 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 53 min |
| Jun 28, 10:10 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 65 min |
| Jun 29, 1:50 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 55 min |
| Jun 29, 2:36 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 54 min |
| Jun 29, 2:42 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 33 min |
| Jun 29, 3:13 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 32 min |
| Jun 29, 5:10 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Custer, Powder River, Rosebud | 65 min |
| Jun 29, 5:44 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 61 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.