Alert archive / Montana / Flash Flood Warnings in 2013

Flash Flood Warning 15, NWS Billings, MT

June 11, 2013Custer County, Montana

NWS Billings, MT issued this flash flood warning at Jun 11, 2013, 8:13 PM MDT for Custer County, Montana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 11, 2013, 8:13 PM MDT (02:13 UTC)
Expired: Jun 11, 2013, 11:15 PM MDT
In force: 3 hr
Issued by: NWS Billings, MT
Area: Storm-based polygon
Flood severity: None

County Custer County, MT

The radar

The Glasgow radar (KGGW), 231 km from the middle of the area, began a volume at 02:15 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 (KUNR), launched 00:00Z, 2.2 hours before the alert went out and 322 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: 1471 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jun 11, 7:16 PM MDT, 57 minutes earlier.

Area forecast discussion, Jun 11, 7:16 PM MDT, 57 minutes before

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Hazardous weather outlook, Jun 11, 1:45 PM MDT, 6 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
145 PM MDT TUE JUN 11 2013

MTZ028>042-056>058-063>068-WYZ098-099-121945-
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-
145 PM MDT TUE JUN 11 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

WIDESPREAD THUNDERSTORM ACTIVITY WILL SPREAD ACROSS THE AREA
THIS AFTERNOON AND CONTINUE EAST AND NORTHEAST TONIGHT. MOST
LOCATIONS COULD SEE STRONG TO POSSIBLY SEVERE THUNDERSTORMS WITH
LARGE HAIL THE MAIN THREAT. WE CANNOT RULE OUT THE POSSIBILITY OF
A TORNADO...MAINLY IN THE SOUTHEAST MONTANA AND NORTHEAST WYOMING
AREA.

IN ADDITION...EXPECT VERY HEAVY RAINFALL FROM SOME STORMS TODAY
INTO TONIGHT. A FLASH FLOOD WATCH HAS BEEN EXTENDED THROUGH
WEDNESDAY EVENING FOR AREAS BURNED BY WILDFIRES IN 2012 WHICH ARE
HIGHLY SUSCEPTIBLE TO FLASH FLOODING AND DEBRIS FLOW.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A PATTERN FAVORABLE FOR MORE SEVERE THUNDERSTORMS WILL CONTINUE
WEDNESDAY AND THURSDAY. AREAS WEST OF A SHERIDAN TO MILES CITY
LINE ARE FAVORED FOR SEVERE STORMS WEDNESDAY. NORTHERN AND EASTERN
SECTIONS OF MONTANA COULD SEE STRONG TO SEVERE THUNDERSTORMS ON
THURSDAY. HEAVY RAINFALL WILL REMAIN A THREAT WITH STORMS EACH
DAY.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jun 11, 7:16 PM MDT, 57 minutes before

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Local storm report, Jun 11, 7:21 PM MDT, 52 minutes before

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Local storm report, Jun 11, 7:30 PM MDT, 43 minutes before

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Special weather statement, Jun 11, 7:33 PM MDT, 40 minutes before

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Local storm report, Jun 11, 7:45 PM MDT, 28 minutes before

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Local storm report, Jun 11, 8:06 PM MDT, 7 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
Jun 11, 6:52 PM MDT	Special Weather Statement	BYZ	Stillwater	53 min
Jun 11, 7:33 PM MDT	Special Weather Statement	BYZ	Carbon	42 min
Jun 11, 8:55 PM MDT	Special Weather Statement	BYZ	Big Horn	35 min
Jun 12, 3:05 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	40 min
Jun 11, 9:56 PM MDT	Special Weather Statement	BYZ	Sheridan	34 min
Jun 12, 5:50 PM MDT	Special Weather Statement	BYZ	Sheridan	40 min

Nearby

Flash Flood Warnings in Montana, 2013 Every flash flood 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; radar from the NEXRAD Level II archive.