Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 4, NWS Billings, MT

May 18, 2013Fallon County, Montana

NWS Billings, MT issued this severe thunderstorm warning at May 18, 2013, 8:23 PM MDT for Fallon County, Montana. It was in force for 22 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: May 18, 2013, 8:23 PM MDT (02:23 UTC)
Expired: May 18, 2013, 8:45 PM MDT
In force: 22 min
Issued by: NWS Billings, MT
Area: Storm-based polygon

County Fallon County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.4 hours before the alert went out and 267 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: 148 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 May 18, 7:46 PM MDT, 37 minutes earlier.

Area forecast discussion, May 18, 7:46 PM MDT, 37 minutes before

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Hazardous weather outlook, May 18, 3:44 PM MDT, 4 hours 39 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
344 PM MDT SAT MAY 18 2013

MTZ028>042-056>058-063>068-WYZ098-099-192145-
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 BIG HORN MOUNTAINS-SHERIDAN FOOTHILLS-
344 PM MDT SAT MAY 18 2013

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

.DAY ONE...TONIGHT

SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL ARE
EXPECTED THROUGH THIS EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Special weather statement, May 18, 3:50 PM MDT, 4 hours 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
350 PM MDT SAT MAY 18 2013

MTC003-075-087-182230-
POWDER RIVER MT-BIG HORN MT-ROSEBUD MT-
350 PM MDT SAT MAY 18 2013

...SPECIAL WEATHER STATEMENT...

AT 347 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 10 MILES SOUTH OF LAME DEER...OR 29 MILES SOUTH
OF COLSTRIP...MOVING NORTHEAST AT 20 MPH.

HAIL UP TO THE SIZE OF PEAS...WIND GUSTS UP TO 30 MPH AND HEAVY
RAINFALL WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ASHLAND AND BIRNEY.

LAT...LON 4535 10676 4575 10647 4559 10622 4526 10654
TIME...MOT...LOC 2147Z 225DEG 17KT 4547 10654

RICHMOND

Special weather statement, May 18, 4:44 PM MDT, 3 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
444 PM MDT SAT MAY 18 2013

MTC011-182330-
CARTER MT-
444 PM MDT SAT MAY 18 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CARTER COUNTY UNTIL
530 PM MDT...

AT 440 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 10 MILES NORTH OF ALBION...MOVING NORTH AT 15
MPH.

HEAVY RAIN...FREQUENT LIGHTNING AND HAIL UP TO THE SIZE OF DIMES ARE
EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CAPITOL.

LAT...LON 4528 10412 4527 10414 4528 10432 4529 10436
      4561 10436 4562 10404 4542 10404
TIME...MOT...LOC 2240Z 182DEG 14KT 4535 10426

LESTER

Local storm report, May 18, 7:25 PM MDT, 58 minutes before

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Local storm report, May 18, 7:26 PM MDT, 57 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 6:14 PM MDT	Flash Flood Warning	BYZ	Custer	2 hr
May 19, 3:58 AM MDT	Flash Flood Watch	BYZ	Big Horn, Carter, Musselshell, Powder River, Rosebud, Treasure	35 hr

Nearby

Severe Thunderstorm Warnings in Montana, 2013 Every severe thunderstorm warning in 2013

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.