Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 85, NWS Billings, MT

July 16, 2002Custer County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 16, 2002, 10:01 PM MDT for Custer County, Montana. It was in force for 59 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
Jul 16, 2002, 10:01 PM MDT (04:01 UTC)
Expired
Jul 16, 2002, 11:00 PM MDT
In force
59 min
Issued by
NWS Billings, MT
Area
Whole counties

County Custer County, MT

The radar

The Glasgow radar (KGGW), 231 km from the middle of the area, began a volume at 04:02 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

TimeReportWhereRemark
Jul 16, 10:30 PM MDTThunderstorm Wind 60 EKinsey, MT

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 16, 5:45 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.0 hours before the alert went out and 232 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.

Skew-T log-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 00:00Z on 2002-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 396 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 00:00Z on 2002-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
396 J/kg
Mixed-layer CIN
-137 J/kg
Mixed-layer LCL
2378 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

959 
WUUS55 KBYZ 170401
SVRBYZ
MTC017-170500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BILLINGS MT
958 PM MDT TUE JUL 16 2002

THE NATIONAL WEATHER SERVICE IN BILLINGS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CUSTER COUNTY IN SOUTHEAST MONTANA
  THIS INCLUDES THE CITY OF MILES CITY

* UNTIL 1100 PM MDT

* AT 958 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH DAMAGING WINDS 21 MILES NORTHWEST OF
  VOLBORG...OR ABOUT 24 MILES SOUTH OF MILES CITY...MOVING           
  NORTHEAST AT 25 MPH. ANOTHER SEVER THUNDERSTORM WAS LOCATED 20 MILES
  SOUTH OF MIZPAH AND WAS MOVING NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   MILES CITY BY 1050 PM MDT.
   MIZPAH BY 1045 PM MDT.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING.

$$

LAT...LON 4670 10606 4582 10613 4583 10504 4648 10505

RICHMOND

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 16, 9:28 PM MDT, 33 minutes earlier.

Area forecast discussion, Jul 16, 9:28 PM MDT, 33 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
928 PM MDT TUE JUL 16 2002

.SHORT TERM...VALID FOR WED...THU...FRI...
WILL BE MAKING SOME CHANGES TO THE ZONES THIS EVENING. WILL REMOVE
WESTERN AREAS FROM THE WATCH AND LOWER POPS ACCORDINGLY. WILL KEEP WATCH
GOING IN OTHER AREAS AS CONVECTION MOVING EAST AND REDEVELOPING OVER
EASTERN AREAS OF SOUTH CENTRAL MONTANA. ANOTHER SHORTWAVE WAS LURKING
OVER WESTERN WYOMING AND MOVING NORTH. CONVECTION OVER WEST CENTRAL
WYOMING WAS SPREADING NORTH TOWARD SOUTH CENTRAL MONTANA. WILL LOWER
POPS BUT KEEP THEM SCATTERED FOR THE WYOMING BATCH. ETA WEAKENS THIS
QUITE A BIT OVERNIGHT. TEMPERATURES LOOK GOOD AND WILL VIRTUALLY LEAVE
UNTOUCHED. HUMPHREY

.LONG TERM...VALID FOR SAT...SUN...MON...TUE...
FRIDAY...UPPER RIDGE BEGINS TO BUILD AHEAD OF LIFTING WEST COAST TROUGH
PER NEWER AVN RUNS. WILL BUMP TEMPS UP A FEW DEGREES WITH WARMING
OCCURRING UNDER BUILDING RIDGE. WITH RIDGE AXIS OVER WESTERN DAKOTAS
BEST INSTABILITY WILL BE IN PLACE OVER THE WEST...WITH SHORTWAVE
APPROACHING BY 00Z...SO WILL TRIM BACK POPS TO INCLUDE WESTERN ZONES
ONLY ATTM.

UPPER TROUGH CURRENTLY OVER WEST COAST PROGGED TO LIFT OVER THE RIDGE
FOR THE WEEKEND. THIS BRINGS SUBSTANTIAL SHORTWAVE ENERGY ACROSS THE
AREA LATE FRIDAY INTO SATURDAY. WILL BACK TEMPS OFF A FEW DEGREES FOR
SATURDAY WITH TROUGH BREAKING DOWN RIDGE AND INTRODUCE CHANCE OF
STORMS...WITH ENERGY ALOFT AND LOWER LEVEL INSTABILITY IN PLACE. THE
REST OF THE EXTENDED WILL BE MAINLY DRY AS FLOW SHIFTS FROM THE
SOUTHWEST TO MORE WEST/NORTHWEST. SOME ENERGY MOVING THROUGH FLOW MAY
SET OFF A FEW STORMS DURING THE PERIOD BUT NOT ENOUGH TO WARRANT
MENTION...WITH TEMPS AROUND OR SLIGHTLY ABOVE SEASONAL AVERAGES. JZ

    WED     THU     FRI     SAT     SUN     MON     TUE
-----------------------------------------------------------
BIL 065/089 063/089 063/091 064/087 063/090 063/087 063/087
    33/T    32/T    22/C    33/T    30/B    00/B    00/B
LVM 058/087 056/091 057/088 056/085 056/089 056/086 056/085
    33/T    33/T    33/T    33/T    30/B    00/B    00/B
HDN 063/091 061/092 063/093 065/087 064/092 064/089 064/088
    63/T    32/T    20/B    33/T    30/B    00/B    00/B
MLS 070/091 068/092 065/094 066/088 066/091 066/088 066/087
    62/T    22/T    20/B    33/T    30/B    00/B    00/B
4BQ 068/092 066/093 064/094 065/088 065/092 064/089 065/087
    43/T    33/T    30/B    33/T    30/B    00/B    00/B
BHK 066/090 064/091 064/090 064/085 065/090 063/087 063/085
    32/T    22/T    20/B    33/T    30/B    00/B    00/B
SHR 066/091 064/092 060/090 059/087 060/091 060/088 061/087
    63/T    34/T    40/B    33/T    30/B    00/B    00/B

.BYZ...
MT...NONE.
WY...NONE.

In the hours before

Special weather statement, Jul 16, 9:10 PM MDT, 51 minutes before
MTZ029-034-035-039-042-056-170415-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
910 PM MDT TUE JUL 16 2002

... THE FOLLOWING COUNTIES HAVE BEEN DROPPED FROM THE SEVERE
THUNDERSTORM WATCH...STILLWATER...CARBON...GOLDEN VALLEY...
MUSSELSHELL AND YELLOWSTONE...

THE THREAT FOR SEVERE THUNDERSTORMS IN THESE AREAS HAS DIMINISH
AND HAVE BEEN DROPPED FROM THE SEVER THUNDERSTORM WATCH.

RICHMOND

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 16, 6:17 PM MDTSevere Thunderstorm WarningBYZMusselshell, Yellowstone58 min
Jul 16, 6:47 PM MDTSevere Thunderstorm WarningBYZBig Horn58 min
Jul 16, 7:22 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure53 min
Jul 16, 10:09 PM MDTSevere Thunderstorm WarningBYZPowder River51 min
Jul 16, 11:08 PM MDTSevere Thunderstorm WarningBYZCuster52 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.