Alert archive / Montana / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 45, NWS Billings, MT

July 6, 2016Custer County, Rosebud County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 6, 2016, 12:56 PM MDT for Custer County, Rosebud County, Montana. It was in force for 64 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 6, 2016, 12:56 PM MDT (18:56 UTC)
Expired: Jul 6, 2016, 2:00 PM MDT
In force: 64 min
Issued by: NWS Billings, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Custer County, MT, Rosebud County, MT

The radar

The Billings radar (KBLX), 194 km from the middle of the area, began a volume at 18:58 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 6, 12:55 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 6.9 hours before the alert went out and 352 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 48 J/kg
Mixed-layer CIN: -380 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 429 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 6, 9:58 AM MDT, 2 hours 58 minutes earlier.

Area forecast discussion, Jul 6, 9:58 AM MDT, 2 hours 58 minutes before

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Hazardous weather outlook, Jul 6, 6:04 AM MDT, 6 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
604 AM MDT WED JUL 6 2016

MTZ028>042-056>058-063>068-WYZ098-099-070215-
SOUTHERN WHEATLAND-MUSSELSHELL-TREASURE-NORTHERN ROSEBUD-CUSTER-
FALLON-NORTHERN STILLWATER-YELLOWSTONE-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-JUDITH GAP-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-NORTHEAST BIGHORN MOUNTAINS-SHERIDAN FOOTHILLS-
604 AM MDT WED JUL 6 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE REGION THIS
AFTERNOON THROUGH TONIGHT. SOME STORMS ARE EXPECTED TO BE STRONG
TO SEVERE, ESPECIALLY IN EASTERN MONTANA.

MONITOR LOCAL FORECAST TODAY FOR UPDATES ON DEVELOPING WEATHER.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

LOOK FOR A CHANCE OF THUNDERSTORMS EACH AFTERNOON AND
EVENING FOR FRIDAY AND SATURDAY, ESPECIALLY OVER HIGHER TERRAIN.

A STRONGER WEATHER SYSTEM IS EXPECTED TO MOVE THROUGH THE REGION
BEGINNING SUNDAY, PRODUCING MORE WIDESPREAD THUNDERSTORMS, A FEW
THUNDERSTORMS MAY BE STRONG TO SEVERE.

In the hours before

Special weather statement, Jul 6, 11:41 AM MDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
1141 AM MDT WED JUL 6 2016

MTZ031-061845-
NORTHERN ROSEBUD MT-
1141 AM MDT WED JUL 6 2016

...SIGNIFICANT WEATHER ADVISORY...

AT 1139 AM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 25 MILES NORTHWEST OF ROCK
SPRINGS TO 18 MILES NORTHEAST OF MELSTONE...AND MOVING EAST AT 30
MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 30 MPH ARE POSSIBLE WITH THESE
STORMS.

LOCATIONS IMPACTED INCLUDE...
ROCK SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4684 10672 4684 10608 4683 10609 4683 10612
      4681 10612 4678 10623 4653 10690 4677 10776
      4686 10715 4686 10672
TIME...MOT...LOC 1739Z 277DEG 26KT 4692 10682 4686 10707 4678 10758

ARTHUR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 11:41 AM MDT	Special Weather Statement	BYZ		64 min
Jul 6, 1:55 PM MDT	Special Weather Statement	BYZ	Custer	65 min
Jul 6, 2:49 PM MDT	Special Weather Statement	BYZ	Carter	41 min
Jul 6, 3:02 PM MDT	Special Weather Statement	BYZ	Fallon	58 min
Jul 6, 3:44 PM MDT	Severe Thunderstorm Warning	BYZ	Fallon	35 min
Jul 6, 4:05 PM MDT	Severe Thunderstorm Warning	BYZ	Fallon	25 min
Jul 6, 4:33 PM MDT	Special Weather Statement	BYZ	Golden Valley	27 min
Jul 6, 5:40 PM MDT	Special Weather Statement	BYZ	Yellowstone	65 min

Nearby

Severe Thunderstorm Warnings in Montana, 2016 Every severe thunderstorm warning in 2016

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.