Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Billings, MT

May 23, 2018Yellowstone County, Montana

NWS Billings, MT issued this severe thunderstorm warning at May 23, 2018, 4:12 PM MDT for Yellowstone County, Montana. It was in force for 48 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 23, 2018, 4:12 PM MDT (22:12 UTC)
Expired
May 23, 2018, 5:00 PM MDT
In force
48 min
Issued by
NWS Billings, MT
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Yellowstone County, MT

The radar

The Billings radar (KBLX), 31 km from the middle of the area, began a volume at 22:14 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.

What was reported inside it

TimeReportWhereRemark
May 23, 4:12 PM MDTHAIL 13 Nne Billings, MT
May 23, 4:14 PM MDTHAIL 0.58 Sw Billings, MT
May 23, 4:15 PM MDTHAIL 14 Ne Billings, MT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.2 hours before the alert went out and 252 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, Great_falls, MT at 12:00Z on 2018-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 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, Great_falls, MT at 12:00Z on 2018-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 square meters per square second.193958Sfc1 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
5 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1429 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
-12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

738 
WUUS55 KBYZ 232212
SVRBYZ
MTC111-232315-
/O.NEW.KBYZ.SV.W.0021.180523T2212Z-180523T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Billings MT
412 PM MDT WED MAY 23 2018

The National Weather Service in Billings has issued a

* Severe Thunderstorm Warning for...
  Central Yellowstone County in south central Montana...

* Until 515 PM MDT.

* At 412 PM MDT, a severe thunderstorm was located over Lockwood, or
  near Billings, moving northeast at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Billings, Lockwood, Shepherd, Huntley and Billings Heights. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4610 10829 4593 10830 4591 10788 4590 10791
      4590 10805 4584 10805 4573 10832 4571 10847
      4584 10859
TIME...MOT...LOC 2212Z 226DEG 15KT 4583 10842 

HAIL...1.00IN
WIND...60MPH
 
$$

Gilstad
2 follow-up statements
043 
WWUS55 KBYZ 232238
SVSBYZ

Severe Weather Statement
National Weather Service Billings MT
438 PM MDT WED MAY 23 2018

MTC111-232315-
/O.CON.KBYZ.SV.W.0021.000000T0000Z-180523T2315Z/
Yellowstone MT-
438 PM MDT WED MAY 23 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT
FOR CENTRAL YELLOWSTONE COUNTY...

At 437 PM MDT, a severe thunderstorm was located over Huntley, or 12
miles northeast of Billings, moving northeast at 15 mph.

HAZARD...Quarter size hail and torrential rain.

SOURCE...Trained Spotters have reported hail to the size of quarters 
         with this storm.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Shepherd and Huntley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4610 10829 4593 10830 4591 10788 4590 10791
      4590 10805 4584 10805 4579 10818 4594 10847
TIME...MOT...LOC 2237Z 226DEG 15KT 4590 10831 

HAIL...1.00IN
WIND...<50MPH
 
$$

Gilstad
912 
WWUS55 KBYZ 232300
SVSBYZ

Severe Weather Statement
National Weather Service Billings MT
500 PM MDT WED MAY 23 2018

MTC111-232310-
/O.CAN.KBYZ.SV.W.0021.000000T0000Z-180523T2315Z/
Yellowstone MT-
500 PM MDT WED MAY 23 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL YELLOWSTONE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 4610 10829 4593 10830 4591 10788 4590 10791
      4590 10805 4584 10805 4579 10818 4594 10847
TIME...MOT...LOC 2257Z 226DEG 15KT 4597 10821 

$$

Gilstad

The office that day

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

IssuedProductOfficeCountiesLasted
May 22, 6:07 PM MDTSpecial Weather StatementBYZYellowstone38 min
May 22, 6:07 PM MDTSevere Thunderstorm WarningBYZCarter38 min
May 22, 6:18 PM MDTSevere Thunderstorm WarningBYZStillwater43 min
May 22, 7:49 PM MDTSevere Thunderstorm WarningBYZStillwater41 min
May 22, 8:43 PM MDTAreal Flood AdvisoryBYZYellowstone3 hr
May 22, 8:51 PM MDTSevere Thunderstorm WarningBYZCarbon54 min
May 22, 9:13 PM MDTAreal Flood AdvisoryBYZCarbon, Stillwater3 hr
May 22, 10:31 PM MDTFlash Flood WarningBYZCarbon6 hr
May 23, 5:00 AM MDTAreal Flood AdvisoryBYZCarbon, Stillwater, Yellowstone7 hr
May 23, 7:55 AM MDTAreal Flood WarningBYZCarbon, Stillwater, Sweet Grass6 hr
May 23, 11:09 AM MDTRiver Flood WarningBYZPark5 days
May 23, 11:45 AM MDTRiver Flood WarningBYZSweet Grass5 days
May 23, 12:14 PM MDTRiver Flood WatchBYZStillwater, Yellowstone3 days
May 23, 12:44 PM MDTAreal Flood WarningBYZCarbon, Stillwater, Sweet Grass6 hr
May 23, 1:25 PM MDTSpecial Weather StatementBYZYellowstone50 min
May 23, 2:52 PM MDTSpecial Weather StatementBYZRosebud38 min
May 23, 3:31 PM MDTSpecial Weather StatementBYZYellowstone44 min
May 23, 3:35 PM MDTSpecial Weather StatementBYZRosebud40 min
May 23, 3:45 PM MDTSevere Thunderstorm WarningBYZRosebud60 min
May 23, 3:49 PM MDTSevere Thunderstorm WarningBYZYellowstone56 min
May 23, 3:58 PM MDTSpecial Weather StatementBYZYellowstone47 min
May 23, 4:03 PM MDTSevere Thunderstorm WarningBYZRosebud57 min
May 23, 4:29 PM MDTSevere Thunderstorm WarningBYZYellowstone61 min
May 23, 4:42 PM MDTSevere Thunderstorm WarningBYZBig Horn63 min
May 23, 4:52 PM MDTSpecial Weather StatementBYZCuster38 min
May 23, 5:06 PM MDTSpecial Weather StatementBYZPowder River39 min
May 23, 5:18 PM MDTSevere Thunderstorm WarningBYZCuster57 min
May 23, 5:31 PM MDTSpecial Weather StatementBYZTreasure44 min
May 23, 5:54 PM MDTSpecial Weather StatementBYZCarter51 min

Nearby

Severe Thunderstorm Warnings in Montana, 2018Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.