Alert archive / Montana / Flash Flood Warnings in 2015

Flash Flood Warning 10, NWS Billings, MT

July 15, 2015Powder River County, Montana

NWS Billings, MT issued this flash flood warning at Jul 15, 2015, 4:21 PM MDT for Powder River 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
Jul 15, 2015, 4:21 PM MDT (22:21 UTC)
Expired
Jul 15, 2015, 7:15 PM MDT
In force
3 hr
Issued by
NWS Billings, MT
Area
Storm-based polygon
Flood severity
None

County Powder River County, MT

The radar

The Billings radar (KBLX), 237 km from the middle of the area, began a volume at 22:23 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, 10.4 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-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2015-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Rapid City, SD at 12:00Z on 2015-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -54 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2650 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-54 m²/s²
0-3 km storm-relative helicity
37 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 7:05 PM MDTSpecial Weather StatementBYZPowder River55 min
Jul 14, 8:29 PM MDTSpecial Weather StatementBYZPowder River61 min
Jul 14, 9:35 PM MDTSpecial Weather StatementBYZYellowstone55 min
Jul 14, 10:37 PM MDTSpecial Weather StatementBYZYellowstone53 min
Jul 14, 11:02 PM MDTSpecial Weather StatementBYZYellowstone43 min
Jul 15, 3:09 PM MDTSpecial Weather StatementBYZBig Horn81 min
Jul 15, 3:17 PM MDTSpecial Weather StatementBYZPowder River58 min
Jul 15, 4:50 PM MDTSpecial Weather StatementBYZPowder River55 min
Jul 14, 6:02 PM MDTSpecial Weather StatementBYZSheridan58 min
Jul 14, 6:43 PM MDTSpecial Weather StatementBYZSheridan62 min

Nearby

Flash Flood Warnings in Montana, 2015Every flash flood warning in 2015

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.