Alert archive / Montana / Red Flag Warnings in 2017

Red Flag Warning 4, NWS Billings, MT

July 20, 201710 counties in Montana

NWS Billings, MT issued this red flag warning at Jul 20, 2017, 2:58 PM MDT for 10 counties in Montana. It took effect at Jul 21, 2017, 6:00 AM MDT. It was in force for 15 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 20, 2017, 2:58 PM MDT (20:58 UTC)
In effect from: Jul 21, 2017, 6:00 AM MDT
Expired: Jul 21, 2017, 9:00 PM MDT
In force: 15 hr
Issued by: NWS Billings, MT

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 127 km from the middle of the area, began a volume at 21:01 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 9.0 hours before the alert went out and 253 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2932 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 89 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 red flag 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 red flag warning went out at Jul 20, 2:57 PM MDT, 1 minute earlier.

Area forecast discussion, Jul 20, 2:57 PM MDT, 1 minute before

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Hazardous weather outlook, Jul 20, 4:17 AM MDT, 10 hours 41 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 3:17 AM MDT	Red Flag Warning	BYZ	Golden Valley, Musselshell, Rosebud, Sweet Grass, Treasure, Wheatland	42 hr
Jul 20, 3:36 PM MDT	Special Weather Statement	BYZ	Fallon	39 min
Jul 20, 3:49 PM MDT	Special Weather Statement	BYZ	Carter	56 min
Jul 20, 4:12 PM MDT	Special Weather Statement	BYZ	Fallon	63 min
Jul 20, 4:48 PM MDT	Special Weather Statement	BYZ	Carter	57 min

Nearby

Red Flag Warnings in Montana, 2017 Every red flag warning in 2017

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.