Severe Thunderstorm Warning 233, NWS Bismarck, ND

000 
WWUS53 KBIS 231105
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
604 AM CDT MON JUL 23 2007

NDC053-061-231130-
/O.CON.KBIS.SV.W.0233.000000T0000Z-070723T1130Z/
MOUNTRAIL ND-MCKENZIE ND-
604 AM CDT MON JUL 23 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM CDT
FOR NORTHEASTERN MCKENZIE AND CENTRAL MOUNTRAIL COUNTIES...

AT 601 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR WHITE EARTH BAY RECREATION AREA...OR ABOUT 44 MILES EAST
OF WILLISTON...MOVING NORTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BELDEN AROUND 630 AM CDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE HAIL...DAMAGING WINDS AND DEADLY LIGHTNING.
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG
BUILDING AND AWAY FROM WINDOWS.

LAT...LON 4813 10289 4783 10276 4798 10228 4823 10240

$$
JF

000 
WWUS53 KBIS 231121
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
621 AM CDT MON JUL 23 2007

NDC053-061-231131-
/O.EXP.KBIS.SV.W.0233.000000T0000Z-070723T1130Z/
MOUNTRAIL ND-MCKENZIE ND-
621 AM CDT MON JUL 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MCKENZIE AND
CENTRAL MOUNTRAIL COUNTIES EXPIRES AT 630 AM CDT...

THE SEVERE THUNDERSTORM HAS WEAKENED AND NO LONGER POSES A
SIGNIFICANT THREAT.

LAT...LON 4813 10289 4783 10276 4798 10228 4823 10240

$$
JF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
344 AM CDT MON JUL 23 2007

.SHORT TERM...TODAY THROUGH WEDNESDAY NIGHT...
FORECAST CONCERNS IN THE SHORT TERM PERIOD WILL CONTINUE TO FOCUS
ON THE VERY HOT AND HUMID CONDITIONS ACROSS THE STATE TODAY AND
TOMORROW. IN ADDITION...FIRE WEATHER WILL BE A MAJOR CONCERN
TODAY AND AGAIN TUESDAY ACROSS THE SOUTHWEST. FOCUS THEN TURNS TO
THUNDERSTORM CHANCES FOR TUESDAY NIGHT THROUGH THURSDAY MORNING.
GENERALLY FOLLOWED THE GFS FOR THE FORECAST DETAILS.

CURRENTLY AT 7:30Z SCATTERED SHOWERS AND THUNDERSTORMS ARE ONGOING
ACROSS PORTIONS OF NORTHWESTERN ND. THIS IS ALL ASSOCIATED WITH A
WEAK UPPER LEVEL IMPULSE OF ENERGY MOVING ACROSS THIS REGION.
ELSEWHERE...SKIES WERE CLEAR AND TEMPERATURES WERE IN THE LOWER TO
MIDDLE 70S WITH DEWPOINTS IN THE UPPER 60S TO LOWER 70S. WITH LIGHT
WINDS ACROSS THE REGION WOULD NOT BE SURPRISED TO SEE SOME FOG
DEVELOP...ESPECIALLY ACROSS THE SOUTH CENTRAL AND SOUTHEASTERN AREAS.

VERY HOT AND HUMID CONDITIONS CONTINUE TODAY AND TOMORROW AS A LARGE
UPPER LEVEL RIDGE REMAINS ENTRENCHED OVER THE NORTHERN PLAINS. IN
FACT...TEMPERATURES WILL MOST LIKELY BE SLIGHTLY WARMER TODAY AND
TOMORROW THEN WHAT WE SAW OVER THE WEEKEND. HEAT INDICES WILL BE
NEAR THE 105 DEGREE THRESHOLD THIS AFTERNOON. WE HAVE DECIDED TO
ISSUE A HEAT ADVISORY FOR PORTIONS OF OUR SOUTHEASTERN CWA. THIS IS
WHERE VERY HOT TEMPERATURES WILL COMBINE WITH UPPER 60S DEWPOINTS TO
PRODUCE THE WARMEST HEAT INDICES. ALSO...HAVE ISSUED A FIRE WEATHER
WATCH FOR OUR SOUTHWESTERN MOST COUNTIES. VERY HOT TEMPERATURES IN
THIS REGION WILL PRODUCE LOW RELATIVE HUMIDITIES IN THE LOWER TO
MIDDLE 20S THIS AFTERNOON. THIS COMBINED WITH BREEZY CONDITIONS WILL
HELP TO PRODUCE DANGEROUS FIRE CONDITIONS.

IN ADDITION TO THE HEAT AND FIRE WEATHER CONCERNS...A SERIES OF
UPPER LEVEL DISTURBANCES WILL BE MOVING NORTHEAST ACROSS MT TODAY
AND TONIGHT. ALTHOUGH MOST OF THE ENERGY WILL REMAIN WEST AND
NORTH OF MY CWA...WE CAN NOT RULE OUT A SPOT THUNDERSTORM LATE
THIS AFTERNOON AND OVERNIGHT ACROSS THE NORTHWEST AS THE NOSE OF A
NOCTURNAL LOW LEVEL JET RESIDES ACROSS THIS AREA. CONFIDENCE IS
VERY LOW AS 700MB TEMPS WILL BE AROUND 15C AND THE LOW LEVELS ARE
QUITE DRY. DID RAISE POPS ACROSS THIS AREA...BUT DECIDED TO LEAVE
THE MENTION OF THUNDER OUT OF THE ZONES.

BY TUESDAY NIGHT THE RIDGE OVER THE REGION GETS FLATTENED BY A
STRONG STORM SYSTEM THAT TRACKS ACROSS CENTRAL CANADA. AS THIS
HAPPENS...THIS WILL SET THE STAGE FOR A MORE ACTIVE PATTERN
TOWARDS THE END OF THE SHORT TERM. AN UPPER LEVEL DISTURBANCE IS
EXPECTED TO DRAG A SURFACE COLD FRONT ACROSS THE STATE ON
WEDNESDAY. THIS WILL BY FAR BRING THE REGION THE BEST CHANCE OF
PRECIPITATION. THE ONLY CHANGES TO THE PREVIOUS FORECAST WAS TO
ADD A SLIGHT CHANCE OF THUNDERSTORMS LATE ON WEDNESDAY AFTERNOON.
IT APPEARS THAT CONVECTION WILL GET GOING IN THE VICINITY OF THE
SURFACE FRONT AS THE CAP BREAKS. IT ALSO APPEARS THAT SOME LOCALLY
HEAVY RAINFALL COULD OCCUR WITH THIS SYSTEM WITH K INDICES IN THE
LOWER 40S AND PRECIPITABLE WATER NEAR 2.00 INCHES.

TEMPERATURES ON WEDNESDAY SHOULD COOL BEHIND THE SURFACE FRONT...AND
WITH POSSIBLE CONVECTION IN THE REGION WE DECIDED TO LOWER MAXES A
FEW DEGREES.

.LONG TERM...THURSDAY THROUGH SATURDAY...
00Z GFS AND ECMWF FAIRLY SIMILAR FOR THURSDAY AND FRIDAY WITH UPPER
RIDGE ACROSS THE NORTHERN PLAINS. SO NO REASON TO CHANGE FORECAST
WITH HIGHS IN THE UPPER 80S TO MID 90S...AND GENERALLY DRY. LITTLE
CHANGE IN THE PATTERN EXPECTED THROUGH SATURDAY.

&&

.AVIATION...
HOT AND HUMID AIRMASS CONTINUES ACROSS THE AREA TODAY. OTHER THAN
THUNDERSTORMS EXITING NORTHWEST NORTH DAKOTA THIS MORNING...AND
MORNING FOG IN THE BISMARCK AND JAMESTOWN AREAS...CONDITIONS WILL BE
VFR TODAY. THUNDERSTORM COMPLEX IN THE WILLISTON AREA SHOULD WEAKEN
AND MOVE NORTHEAST OUT OF THE AREA THIS MORNING. NO OTHER
THUNDERSTORMS ARE EXPECTED TODAY. THE VERY HUMID AIRMASS AND LIGHT
WINDS WILL CREATE SOME AREAS OF FOG FROM BISMARCK TO JAMESTOWN THIS
MORNING. MVFR WITH SOME SPOTTY IFR VISIBILITIES ARE POSSIBLE THROUGH
MID-MORNING.

&&

.FIRE WEATHER...
FIRE WEATHER CONCERNS RETURN TO THE FOREFRONT NOW THAT TRIPLE
DIGIT TEMPERATURES THE PAST FEW DAYS AND GENERALLY DRY WEATHER
HAVE FURTHER CURED FUELS ACROSS THE STATE. THE MOST CRITICAL
AREAS RESIDE ACROSS THE WEST CENTRAL AND SOUTHWESTERN CWA.
ALREADY HAD ONE FIRE BURN SOME 600 ACRES ON SATURDAY IN BOWMAN
COUNTY. WITH MIN RH VALUES NEARING 20 PERCENT IN COMBINATION WITH
LIKELY TRIPLE DIGIT TEMPS AGAIN THIS AFTERNOON AND A BIT BREEZIER
WINDS AROUND 15-20 MPH...HAVE DECIDED TO ISSUE A FIRE WEATHER
WATCH FOR BOTH BOWMAN AND SLOPE COUNTIES THIS AFTERNOON AND EARLY
EVENING. ON TUESDAY CONTINUED VERY HOT TEMPERATURES AND LOW RH
VALUES ARE AGAIN FORECAST FOR THE WEST CENTRAL AND SOUTHWEST. THIS
TIME AROUND WINDS WILL BE STRONGER AT 15 TO 30 MPH. A FIRE WEATHER
WATCH OR RED FLAG WARNING IS THUS LIKELY ACROSS THIS
AREA...ENCOMPASSING MORE COUNTIES THAN TODAYS WATCH.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
HEAT ADVISORY FROM 2 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING
FOR NDZ036-037-045>048-050-051.

FIRE WEATHER WATCH FROM 11 AM MDT THIS MORNING THROUGH THIS
EVENING FOR NDZ040-043.

&&

KB/NH/JF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
423 AM CDT MON JUL 23 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0418 AM     TSTM WND GST     WILLISTON               48.16N 103.63W
07/23/2007  M75 MPH          WILLIAMS           ND   ASOS

&&

KBIRK