Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 191, NWS Billings, MT

July 18, 2001Carter County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 18, 2001, 8:45 PM MDT for Carter County, Montana. It was in force for 45 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 18, 2001, 8:45 PM MDT (02:45 UTC)
Expired: Jul 18, 2001, 9:30 PM MDT
In force: 45 min
Issued by: NWS Billings, MT
Area: Whole counties

County Carter County, MT

The radar

The Rapid City radar (KUDX), 205 km from the middle of the area, began a volume at 02:46 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

Time	Report	Where	Remark
Jul 18, 8:57 PM MDT	Hail 0.88	Mill Iron, MT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 4:15 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.8 hours before the alert went out and 207 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: 1170 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 2287 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 18, 8:43 PM MDT, 2 minutes earlier.

Area forecast discussion, Jul 18, 8:43 PM MDT, 2 minutes before

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In the hours before

Local storm report, Jul 18, 4:00 PM MDT, 4 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS, MT
400 PM MDT WED JUL 18 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0720 PM    10 SE ROUNDUP             MT   80 MPH TSTM WIND GUST
07/02/01   MUSSELSHELL                    LAW ENFORCEMENT REPORTED
                                          TREES DOWN IN THE BULL
                                          MOUNTAINS

0930 PM    DECKER                    MT   FLASH FLOODS
07/14/01   BIG HORN                       145 FEET OF ROAD BED
                                          WASHED OUT BENEATH THE
                                          BURLINGTON/NORTHERN
                                          RAILROAD TRACKS. 2 FEET OF
                                          WATER OVER TRACKS. REPORTED
                                          BY RAILROAD OFFICIAL.

0445 PM    BOYD                      MT   .75 INCH HAIL
07/17/01   CARBON                         REPORTED BY SPOTTERS

0430 PM    3 W PARK CITY             MT   .75 INCH HAIL
07/17/01   STILLWATER                     REPORTED BY SPOTTERS

0532 PM    10 W BILLINGS             MT   .75 INCH HAIL
07/17/01   YELLOWSTONE                    REPORTED BY NWS EMPLOYEE.

0545 PM    BILLINGS                  MT   FLASH FLOODS
07/17/01   YELLOWSTONE                    STREET FLOODING ON THE
                                          SOUTH SIDE OF BILLINGS.
                                          REPORTED BY NWS EMPLOYEE.

0700 PM    9.5 N HARDIN              MT   .75 INCH HAIL
07/17/01   BIG HORN                       REPORTED BY SPOTTERS

0200 AM    25 NW BAKER               MT   .75 INCH HAIL
07/18/01   FALLON                         REPORTED BY SPOTTERS

1235 AM    11 SE MILES CITY          MT   .75 INCH HAIL
07/18/01   CUSTER                         REPORTED BY SPOTTERS

1200 AM    1[0 NE MILES CITY          MT   .75 INCH HAIL
07/18/01   CUSTER                         REPORTED BY SPOTTERS

TJ

Special weather statement, Jul 18, 7:05 PM MDT, 1 hour 40 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
Jul 18, 6:00 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	60 min
Jul 18, 6:45 PM MDT	Severe Thunderstorm Warning	BYZ	Fallon	60 min
Jul 18, 6:59 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	61 min
Jul 18, 7:03 PM MDT	Tornado Warning	BYZ	Fallon	42 min
Jul 18, 7:12 PM MDT	Flash Flood Warning	BYZ	Powder River	2 hr
Jul 18, 7:42 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	63 min
Jul 19, 5:14 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	61 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every severe thunderstorm warning in 2001

Sources

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