Storm totals released, and very impressive!

The National Weather Service has released a completed listing of this latest spring storm. Very interesting reading! I hope you enjoy it.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1235 PM MDT FRI APR 30 2010

...STORM SUMMARY 28-30 APRIL 2010...

A STRONG WINTER STORM ON THE ANNIVERSARY OF A RECORD-SETTING WINTER 
STORM IN 2009 RAGED ACROSS PORTIONS OF MONTANA ON 28-30 APRIL 2010. 
HEAVY SNOWFALL AND STRONG WINDS CAUSED ROADS TO BE CLOSED. HEAVY 
SNOW COLLECTING ON POWER LINES CAUSED WIDESPREAD POWER OUTAGES. 
PHONE OUTAGES ALSO OCCURRED. AIRPORT OPERATIONS AT GREAT FALL 
AIRPORT WERE DISRUPTED...WITH FLIGHTS DIVERTED TO MISSOULA. WINDS 
DRIFTED THE SNOW INTO LARGE DRIFTS AS DEEP AS FIVE TO NINE FEET IN 
THE SNOWIEST AREAS. THE HEAVIEST SNOW FELL NEAR THE SWEET GRASS 
HILLS...THE LITTLE BELT MOUNTAINS...AND THE SNOWY MOUNTAINS.

THE STORM BEGAN WITH RAIN AND SNOW FALLING ACROSS CENTRAL MONTANA ON 
THE MORNING OF 28 APRIL...AND CONTINUED WITH PERIODS OF HEAVY SNOW 
THROUGH THE EVENING OF 29 APRIL...BEFORE DECREASING TO LIGHT SNOW ON 
THE MORNING OF 30 APRIL.

AS THE STORM INTENSIFIED ON 29 APRIL...SNOW AND RAIN BECAME 
WIDESPREAD ACROSS CENTRAL MONTANA. HEAVY SNOW FELL IN UPSLOPE AREAS 
OF THE ISLAND RANGES OF CENTRAL MONTANA...THE BEARS PAWS...SNOWYS 
AND SWEET GRASS HILLS. WINDS WERE VERY STRONG. GUSTS OVER 60 MPH 
OCCURRED AT ELKHORN RAWS /SOUTH OF HELENA/...CUT BANK AND OTHER 
LOCATIONS SCATTERED ACROSS TETON THROUGH TOOLE COUNTIES. THE STRONG 
SURFACE LOW PRESSURE AREA ALSO ESTABLISHED NEW MONTHLY LOWEST 
PRESSURE AND SOME DAILY WIND GUST RECORDS.

SOME PORTIONS OF THE LITTLE BELT MOUNTAINS RECEIVED UP TO 48 INCHES 
OF SNOW AND 3.5 INCHES OF PRECIPITATION /MELTED SNOW/. AS 
SUCH...THIS STORM RIVALED THE RECORD EVENT OF LATE APRIL 2009. 
HOWEVER...THE AIR PRESSURE WAS LOWER AND WINDS STRONGER WITH THIS 
EVENT. AT GREAT FALLS...10.2 INCHES OF SNOW FELL...WHICH IS THE 13TH 
LARGEST 24-HOUR AMOUNT OF RECORD. WITH THE LATEST SNOWFALL...GREAT 
FALLS HAS RECEIVED 23.8 INCHES OF SNOW FOR APRIL...WHICH IS THE 
FIFTH GREATEST AMOUNT OF RECORD FOR APRIL.

TABLE OF SELECT SNOWFALL AND PRECIPITATION REPORTS...

LOCATION...     SNOWFALL /INCHES/    PRECIPITATION /INCHES/
MILLEGAN        48 INCHES            2.50
ONION PARK      43                   3.50
STRINGER CREEK  43                   3.80
NEAR WHITLASH   36                   3.00
CRYSTAL LAKE    34                   3.20
BRACKETT CREEK  24                   3.30
NEIHART         19.3                 1.51
LONE MTN        18                   1.20
PICKFOOT CREEK  16                   2.00
WALDRON         16                   1.00
ROCKY BOY       13                   3.60
GREAT FALLS     10.2                 1.03   

ALONG WITH THE STRONG WIND GUSTS...THE AVERAGE WIND SPEEDS ON 29 
APRIL WERE ALSO IMPRESSIVE. THE 60 MPH GUST AT CUT BANK ON 29 APRIL 
SET A DAILY WIND SPEED RECORD. THE AVERAGE WIND SPEED FOR THE DAY 
WAS 38.1 MPH...THE WINDIEST DAY OF RECORD IN APRIL AT CUT BANK. THE 
OLD RECORD WAS 35.9 MPH IN 1943. THIS WAS ALSO THE WINDIEST APRIL 
DAY AT CUT BANK SINCE 1989. AT HAVRE...THE DAILY WIND SPEED AVERAGE 
WAS 23.9 MPH...THE WINDIEST APRIL DAY SINCE 1978. AT GREAT 
FALLS...THE DAILY WIND SPEED AVERAGE OF 29.0 MPH WAS THE WINDIEST 
APRIL DAY SINCE 1978. THE WIND GUST OF 52 MPH AT GREAT FALLS TIED 
THE DAILY GUST ON THE 29TH. THESE STRONG WINDS CONTRIBUTED TO THE 
LOSS OF POWER AND PHONE SERVICE OVER A LARGE PORTION OF CENTRAL 
MONTANA.

ALSO OF NOTE WAS THE STRENGTH OF THE LOW PRESSURE SYSTEM. AT SEVERAL 
LOCATIONS THIS WAS THE LOWEST PRESSURE OF RECORD MEASURED DURING THE 
MONTH OF APRIL. AT THE LOCATIONS THAT SET NEW RECORDS...THIS 
EXCEEDED THE RECORD LAST SET ON 29 APRIL 1951. ON APRIL 29-MAY 1 
1951...A STRONG LOW PRESSURE AREA MOVED ALONG THE INTERNATIONAL 
BORDER AND PRODUCED VERY HEAVY RAINFALL AND SNOW ACROSS WESTERN AND 
CENTRAL MONTANA. THE FOLLOWING TABLE SUMMARIZES THE NEW PRESSURE 
RECORDS.

TABLE OF NEW APRIL LOW-PRESSURE RECORDS...

LOCATION...       PRESSURE
CUT BANK          29.10 INCHES/ 984.7 MILLIBARS
GREAT FALLS       29.14       / 986.3
HAVRE             29.06       / 984.7
LEWISTOWN         29.17       / 986.2

THIS STORM OF 2010 ALSO SET NEW APRIL LOW READINGS FOR THE 850 MB 
AND 700 MB LEVELS AT GREAT FALLS.


FOR ADDITIONAL GRAPHICS WITH THE REPORT...GO TO
http://WWW.WRH.NOAA.GOV/TFX/PDFS/HYDRO/2010APR29.PDF
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