Alert archive / Montana / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 91, NWS Billings, MT

August 9, 2016Powder River County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Aug 9, 2016, 4:08 PM MDT for Powder River County, Montana. It was in force for 52 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: Aug 9, 2016, 4:08 PM MDT (22:08 UTC)
Expired: Aug 9, 2016, 5:00 PM MDT
In force: 52 min
Issued by: NWS Billings, MT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Powder River County, MT

The radar

The Billings radar (KBLX), 237 km from the middle of the area, began a volume at 22:11 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 nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 10.1 hours before the alert went out and 262 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: 813 J/kg
Mixed-layer CIN: -373 J/kg
Mixed-layer LCL: 1614 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Aug 9, 3:22 PM MDT, 46 minutes earlier.

Area forecast discussion, Aug 9, 3:22 PM MDT, 46 minutes before

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Hazardous weather outlook, Aug 9, 3:40 AM MDT, 12 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
340 AM MDT TUE AUG 9 2016

MTZ030>033-036>038-057-058-092345-
TREASURE-NORTHERN ROSEBUD-CUSTER-FALLON-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-NORTHERN BIG HORN-SOUTHERN ROSEBUD-
340 AM MDT TUE AUG 9 2016

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON
AND EVENING. A FEW STORMS COULD BE STRONG TO SEVERE...WITH
DAMAGING WIND GUSTS THE MAIN THREAT. ISOLATED LARGE HAIL AND BRIEF
HEAVY RAIN ARE ALSO POSSIBLE. CONDITIONS CONDUCIVE FOR AN ISOLATED
TORNADO WILL EXIST OVER FALLON AND CARTER COUNTIES. THOSE WITH
OUTDOOR PLANS SHOULD KEEP A CLOSE EYE ON THE SKY THIS AFTERNOON
AND SEEK SHELTER QUICKLY SHOULD STORMS DEVELOP.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 9, 3:21 PM MDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
321 PM MDT TUE AUG 9 2016

MTZ036-092215-
POWDER RIVER MT-
321 PM MDT TUE AUG 9 2016

...SIGNIFICANT WEATHER ADVISORY...

AT 319 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 27
MILES SOUTH OF ASHLAND...OR 37 MILES SOUTHWEST OF BROADUS...MOVING
NORTHEAST AT 30 MPH.

NICKEL SIZE HAIL...WIND GUSTS UP TO 50 MPH AND BRIEF HEAVY RAIN ARE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SONNETTE AND OTTER.

LAT...LON 4510 10606 4519 10627 4551 10613 4557 10593
      4527 10554
TIME...MOT...LOC 2119Z 211DEG 28KT 4522 10611

HOOLEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:21 PM MDT	Special Weather Statement	BYZ	Powder River	54 min
Aug 9, 4:25 PM MDT	Special Weather Statement	BYZ	Carter	65 min
Aug 9, 4:58 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	62 min
Aug 9, 5:53 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	52 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.