Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 231, NWS Billings, MT

July 23, 2001Big Horn County, Montana; Sheridan County, Wyoming

NWS Billings, MT issued this severe thunderstorm warning at Jul 23, 2001, 5:04 PM MDT for Big Horn County, Montana; Sheridan County, Wyoming. It was in force for 56 min. 2 reports 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 23, 2001, 5:04 PM MDT (23:04 UTC)
Expired: Jul 23, 2001, 6:00 PM MDT
In force: 56 min
Issued by: NWS Billings, MT
Area: Whole counties

Counties Big Horn County, MT, Sheridan County, WY

What was reported inside it

Time	Report	Where	Remark
Jul 23, 5:15 PM MDT	Hail 1.75	Sheridan, WY	Hail drifted over a foot deep
Jul 23, 5:52 PM MDT	Hail 1	Busby, 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 23, 4:45 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

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 23, 1:59 PM MDT, 3 hours 5 minutes earlier.

Area forecast discussion, Jul 23, 1:59 PM MDT, 3 hours 5 minutes before

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
159 PM MDT MON JUL 23 2001

.TUE AND WED...
AVN SEEMS TO HAVE A BETTER HANDLE ON THE SHORT WAVE GOING INTO WESTERN
MONTANA...KICKING OFF SHOWERS AND THUNDERSTORMS...LOOKING HOW BOTH
MODELS LINED UP WITH THE 18Z WATER VAPOR IMAGERY. DIFFICULT TO TELL ON
THEIR ALIGNMENT WITH THE SURFACE FEATURES AT 18Z. BOTH MODELS BASICALLY
TELL THE SAME STORY...NAMELY THE SLOW EAST PROGRESSION OF THE UPPER
TROUGH. THEY DIFFER IN STRENGTH AND TIMING OF THE SHORT WAVES.

THE MAIN THETA E MAXIMA REMAINS SOUTH OF MONTANA IN WYOMING THROUGHOUT
THE PERIOD. AVN AND ETA DIFFER IN PUSHING UP RIDGES INTO MONTANA...BUT
BOTH SOLUTIONS POINT TO A CONTINUING CHANCE OF THUNDERSTORMS WITH THE
BETTER POSSIBILITIES BEING OVER WYOMING INTO SOUTHEAST MONTANA. CAPES
NOT THAT BAD FOR THE REST OF TODAY...BUT THEY LOOK PROMISING FOR
TUESDAY OVER ABOUT THE EAST HALF OF THE COUNTY WARNING AREA. THEY ALSO
BECOME RATHER HIGH WEDNESDAY OVER EXTREME SOUTHEAST MONTANA AND
SHERIDAN COUNTY. AS THE UPPER TROUGH ADVANCES...MOISTURE BEGINS
DROPPING. IT SEEMS REASONABLE TO LOWER POPS TO ISOLATED ON WEDNESDAY
OVER MOST AREAS...BUT TO KEEP SCATTERED POPS GOING FOR EXTREME SOUTHEAST
MONTANA INTO SHERIDAN COUNTY WYOMING. AM HAVING PROBLEMS WITH AVN ON
WEDNESDAY WITH A VERY STRONG DIVERGENCE PATTERN DEVELOPING OVER ROUGHLY
CENTRAL MONTANA. THIS WOULD AID IN THUNDERSTORM DEVELOPMENT AND THE
SITUATION WILL HAVE TO BE WATCHED. WILL SEE WHAT OTHER MODEL RUNS
INDICATE. CHB

.THU...FRI...SAT...SUN...MON...
AFTER WAVE PASSES WEDNESDAY MORE OF A WESTERLY FLOW BUILDS INTO AREA...
HOWEVER FLOW CONTINUES TO HAVE SOMEWHAT A CYCLONIC FLOW TO IT THURSDAY
AND FRIDAY. WOULD EXPECT A FEW WAVES TO MOVE ACROSS AREA THURSDAY AND
FRIDAY IN THIS FLOW. WESTERLY FLOW...SHOULD...DRY LOWER ATMOSPHERE TO
KEEP CONVECTION THAT DOES OCCUR LESS WIDE SPREAD...BUT ENOUGH TO KEEP
MENTION OF THUNDERSTORMS IN THURSDAY AND FRIDAY. SATURDAY...MODELS BEGIN
TO DIVERGE A BIT. MRF/UKMET DRIVE ENERGY SOUTH FROM GULF OF ALASKA INTO
PACIFIC NORTHWEST WITH DEEPENING SOUTHWEST FLOW OVER MONTANA...THEN
MOVE TROUGH ACROSS AREA...WITH WESTERLY FLOW BY MONDAY. ECMWF MORE
PROGRESSIVE WITH THIS ENERGY SLIDING IT ACROSS MONTANA SATURDAY WITH
RIDGING BY LATE SUNDAY. NEW AVN ON THE OTHER HAND HAS TROUGH MUCH DEEPER
ON WEST COAST THAN 00Z MRF...WHICH COULD OPEN US UP TO DEEPER MOISTURE
AGAIN SATURDAY AND SUNDAY...THUS WILL CONTINUE CHANCE OF THUNDERSTORMS
SATURDAY AND SUNDAY. RASCH

    TUE     WED     THU     FRI     SAT     SUN     MON
-----------------------------------------------------------
BIL 056/088 057/088 060/088 062/090 063/090 059/087 057/084
    33/T    32/T    33/T    33/T    33/T    33/T    11/B
LVM 049/084 048/084 055/085 057/086 058/087 055/085 053/080
    32/T    22/T    33/T    33/T    33/T    33/T    11/B
HDN 053/092 054/092 058/090 060/092 061/092 057/089 055/086
    43/T    42/T    33/T    33/T    33/T    33/T    11/B
MLS 058/088 059/092 062/087 063/088 064/090 060/088 057/085
    33/T    32/T    33/T    33/T    33/T    33/T    11/B
4BQ 059/086 058/091 060/086 061/087 062/089 058/087 055/084
    44/T    43/T    33/T    33/T    33/T    33/T    11/B
BHK 056/084 057/089 059/085 060/086 060/088 056/086 054/083
    33/T    32/T    33/T    33/T    33/T    33/T    11/B
SHR 055/087 055/090 057/088 058/090 058/090 -056/087 054/084
    44/T    43/T    33/T    33/T    33/T    33/T    11/B

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 8:38 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	67 min
Jul 23, 5:03 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Musselshell	57 min
Jul 23, 5:59 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	61 min
Jul 22, 6:00 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	90 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Severe Thunderstorm Warnings in Wyoming, 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.