Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 253, NWS Billings, MT

July 25, 2001Custer County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 25, 2001, 8:00 PM MDT for Custer County, Montana. It was in force for 60 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 25, 2001, 8:00 PM MDT (02:00 UTC)
Expired: Jul 25, 2001, 9:00 PM MDT
In force: 60 min
Issued by: NWS Billings, MT
Area: Whole counties

County Custer County, MT

What was reported inside it

Time	Report	Where	Remark
Jul 25, 8:10 PM MDT	Hail 1.75	Miles City, 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 25, 5:15 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.0 hours before the alert went out and 232 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: 633 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1657 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

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 25, 2:30 PM MDT, 5 hours 30 minutes earlier.

Area forecast discussion, Jul 25, 2:30 PM MDT, 5 hours 30 minutes before

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
230 PM MDT WED JUL 25 2001

.THU AND FRI...
ACTIVE SLIGHTLY CYCLONIC FLOW OVER AREA NEXT 2 DAYS.

TONIGHT...TOUGH FORECAST TO FIGURE EXACTLY WHEN AND WHERE CONVETION
WILL FIRE...WITH NO DEFINANT TRIGGER EVIDENT ON SATELLITE. 18Z MESO-ETA
PROGGING GREAT MOISTURE ADVECTION BACK INTO CENTRAL MONTANA TONIGHT.
CURRENT LAPS CAPES SHOWING SHARP GRADIENT FROM 1000 J/KG OVER MLS TO
2800 J/KG OVER BAKER. INSTABILITY NOT A PROBLEM AT THIS TIME EASTERN
ZONES...AND IF MESO-ETA VERIFIES WONT BE A PROBLEM FURTHER WEST LATER
TONIGHT. CURRENT VISIBLE IMAGERY SHOWING SEVERAL POSSIBLE BOUNDARIES
OVER SOUTHEAST MONTANA WHICH MAY HELP TO INITIATE CONVECTION. MESO-ETA
POINTING TO CONVECTION INITIATING IN CENTRAL MONTANA AND THEN MOVING
NORTHEAST. WILL LEAVE SEVERE WORDING OUT OF WESTERN ZONES AT THIS
TIME...AS NOT AS CONFIDENT THERE...BUT WILL LEAVE IN EASTERN ZONES.

THURSDAY LOOKS EVEN BETTER FOR SEVERE CONVECTION...ACROSS ENTIRE COUNTY
WARNING AREA. EASTERLY FLOW CONTINUES OVER NIGHT AND PUSHED INSTABILTY
BACK TO LVM. A BETTER TRIGGER IN THE FORM OF A 500 MB WAVE PUSHES INTO
AREA IN THE AFTERNOON TO TRIGGER ACTIVITY. WILL COVER WITH HIGH
SCATTERED POPS.

FRIDAY...SLIGHT RIDGING TRIES TO BUILD IN...BUT ATMOSPHERE REMAINS
UNSTABLE AND NOT CAPPED..FOR CONTINUED CHANCE OF CONVECTION. RASCH

.SAT...SUN...MON...TUE...WED...
SEE NO REASON TO CHANGE TO CURRENT THINKING OF THE EXTENDED. CONSENSUS
IS THAT THE MRF IS TOO PROGRESSIVE ON SENDING PACIFIC NORTHWEST TROUGH
THROUGH THE NORTHERN ROCKIES THIS WEEKEND. SINCE THE MRF IS THE ODD
MODEL OUT IN DOING THIS...WILL LEAN TOWARD THE ECMWF. THE CURRENT
EXTENDED WAS COMPOSED WITH THIS IDEA IN MIND...SO WILL NOT TINKER MUCH
WITH IT. UPPER RIDGE OVER THE SOUTHERN ROCKIES AND CENTRAL PLAINS SHOULD
KEEP IT FAIRLY WARM AND UNSETTLED. SOUTHWEST FLOW REMAINS ENTRENCHED
OVER MONTANA FOR AFTERNOON AND EVENING THUNDERSTORMS. HUMPHREY

    THU     FRI     SAT     SUN     MON     TUE     WED
-----------------------------------------------------------
BIL 059/086 060/087 062/091 059/084 062/087 060/085 058/083
    34/T    42/T    34/T    43/T    33/T    33/T    33/T
LVM 053/085 057/086 059/088 056/081 059/084 057/082 057/080
    24/T    42/T    34/T    43/T    33/T    33/T    33/T
HDN 057/088 058/089 061/093 057/086 060/089 058/087 056/085
    34/T    42/T    34/T    43/T    33/T    33/T    33/T
MLS 060/088 062/090 064/094 064/087 064/090 062/088 060/086
    44/T    43/T    34/T    43/T    33/T    33/T    33/T
4BQ 060/087 062/088 063/093 063/086 063/089 061/087 059/085
    44/T    43/T    34/T    43/T    33/T    33/T    33/T
BHK 059/086 061/087 061/091 060/084 060/087 059/085 057/083
    44/T    43/T    34/T    43/T    33/T    33/T    33/T
SHR 057/088 058/085 059/091 057/085 059/088 057/086 055/084
    44/T    42/T    34/T    43/T    33/T    33/T    33/T

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:42 PM MDT	Tornado Warning	BYZ	Fallon	63 min
Jul 25, 7:00 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	30 min
Jul 25, 7:30 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	30 min
Jul 25, 7:45 PM MDT	Tornado Warning	BYZ	Fallon	55 min
Jul 26, 11:00 AM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Wheatland	60 min
Jul 26, 12:00 PM MDT	Flash Flood Warning	BYZ	Golden Valley	3 hr
Jul 26, 12:00 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley	60 min
Jul 26, 12:42 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	63 min
Jul 26, 12:59 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley	61 min
Jul 26, 1:46 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	59 min
Jul 26, 2:26 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	64 min
Jul 26, 2:30 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure	60 min
Jul 26, 3:12 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	63 min
Jul 26, 3:27 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	93 min
Jul 26, 3:30 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure	60 min
Jul 26, 3:34 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	56 min
Jul 26, 3:37 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	53 min
Jul 26, 4:15 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	60 min
Jul 26, 5:15 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	60 min
Jul 26, 5:18 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	57 min
Jul 26, 5:52 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	58 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.