Alert archive / Colorado / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 153, NWS Denver/Boulder, CO

September 14, 2001Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 14, 2001, 5:27 PM MDT for Washington County, Colorado. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Sep 14, 2001, 5:27 PM MDT (23:27 UTC)
Expired: Sep 14, 2001, 6:00 PM MDT
In force: 33 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Washington County, CO

The radar

The Goodland radar (KGLD), 117 km from the middle of the area, began a volume at 23:28 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.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.5 hours before the alert went out and 26 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1754 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

431 
WUUS55 KBOU 142328
SVRDEN
COC121-150000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
527 PM MDT FRI SEP 14 2001

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO

* UNTIL 600 PM MDT

* AT 527 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR ARICKAREE SCHOOL...OR ABOUT 29 MILES SOUTH
  OF AKRON...MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...ARICKAREE
SCHOOL.

LARGE HAIL WILL ACCOMPANY THE STORM. 

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3979 10307 3959 10296 3963 10286 3983 10298

SWE

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 Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 14, 2:34 PM MDT, 2 hours 53 minutes earlier.

Area forecast discussion, Sep 14, 2:34 PM MDT, 2 hours 53 minutes before

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
234 PM MDT FRI SEP 14 2001

UPPER TROUGH OF LOW PRESSURE CURRENTLY OVER EASTERN MONTANA DOESNT
PLAN ON MOVING MUCH THROUGH THE NEXT 48 HRS ACCORDING TO THE ETA.
WITH COMPLEX PATTERN OVER MUCH OF THE USA...CANT REALLY ARGUE
AGAINST MODELS SOLUTIONS FOR THE FUTURE ATTM.  FIRST ITEM TO BE
CONCERNED WITH TODAY IS BETTER MOISTURE OVER THE EASTERN PLAINS DUE
TO LAST NIGHTS COOL SURGE AND AN ADVANCING JET MAX WHICH IS EXPECTED
TO RUN OVER COLO/WYO BORDER TONIGHT THROUGH SAT.  THIS COULD MAKE
FOR AN ACTIVE EVENING ON THE NORTHERN PLAINS AND WILL BUMP POPS UP A
CATEGORY FOR THIS.  SECOND ITEM IS THE COLD FRONT WHICH IS CURRENTLY
ADVANCING SOUTH ACROSS WYO AND IS LIKELY TO ARRIVE IN THE BOU CWA IN
THE 03Z-06Z SAT TIME FRAME.  CURRENT FCST LOOKS ON TRACK WITH
MENTION OF SEVERE ON THE FAR PLAINS TONIGHT AND SCATTERED COVERAGE
OVER MUCH OF CWA FOR SAT AND SAT NIGHT.  WILL EXPECT A MUCH COOLER
DAY ON THE PLAINS...URBAN CORRIDOR AND FOOTHILLS WITH LOW CLOUDS...
LIGHT EARLY DAY PRECIP AND AFTERNOON THUNDERSTORMS AND A 10 TO 15
DEGF COOL DOWN.  DECENT DIV-Q ASCENT BECOMES PRESENT OVER NORTHERN
COLORADO LATE TONIGHT WITH SUBSIDENCE TAKING OVER BY 18Z SAT.  WILL
NOT EXPECT TOO MUCH IN THE WAY OF POPS IN THE HIGH COUNTRY SAT AND
SAT EVE DUE TO RELATIVE SHALLOWNESS OF MOISTURE AND QUICK TRANSFER
OVER TO A SUBSIDENT ENVIRONMENT WITH THE TROUGH AXIS PASSAGE A DRYER
AIRMASS FROM THE WEST AND WESTERLY SFC FLOW. GUIDANCE TEMPS ARE ALL
OVER THE PLACE FOR SATURDAY AND ITS PROBABLE THAT HIGHS WILL NOT GET
OUT OF THE 60S AT MOST LOCATIONS EVEN WITH CLOUDS DECREASING IN THE
AFTERNOON.  FCST SOUNDINGS OVER THE AREA SHOW ENTIRE SOUNDING
TRENDING TO A WESTERLY DIRECT BY MIDDAY SUNDAY WITH DRYING AT THE
LOW LEVELS.

EXTENDED PD...MONDAY THROUGH FRIDAY...AVN SHOWS UPPER LOW FINALLY
LEAVING THE DAKOTAS AREA LATE MONDAY INTO TUESDAY.  IN DOING SO...
AVN SFC FIELDS BRING ANOTHER SURGE INTO THE NORTHEAST PLAINS FOR
TUESDAY INTO WEDNESDAY AS NORTHERLY FLOW BEHING TROUGH PUSHES COOL
AIR SOUTH.  THERE IS WEAK SHORT WAVE EMBEDDED IN THE INCREASING
NORTHWESTERLY FLOW WITH SOME MORE DIV-Q ASCENT AND WILL KEEP CHANCE
FOR PRECIP FOR TUESDAY AND WEDNESDAY.  FLOW ALOFT REMAINS
NORTHWESTERLY FOR THURSDAY AND FRIDAY BUT DRYING TAKES PLACE OVER
THE WESTERN USA WITH BUILDING RIDGE.   FREDIN

.DEN...NONE.

In the hours before

Local storm report, Sep 14, 3:00 PM MDT, 2 hours 27 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
300 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

RAY

Local storm report, Sep 14, 3:52 PM MDT, 1 hour 35 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
352 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

0312PM     10 E NEW RAYMER           CO   0.75 INCH HAIL
09/14/01   WELD

0351PM     1 NE HILLROSE             CO   1.00 INCH HAIL
09/14/01   MORGAN

RAY

Local storm report, Sep 14, 4:20 PM MDT, 1 hour 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
420 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

0312PM     10 E NEW RAYMER           CO   0.75 INCH HAIL
09/14/01   WELD

0351PM     1 NE HILLROSE             CO   1.00 INCH HAIL
09/14/01   MORGAN

0419PM     5 N AKRON                 CO   1.25 INCH HAIL
09/14/01   WASHINGTON

RAY

Local storm report, Sep 14, 5:00 PM MDT, 27 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
500 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

0312PM     10 E NEW RAYMER           CO   0.75 INCH HAIL
09/14/01   WELD

0351PM     1 NE HILLROSE             CO   1.00 INCH HAIL
09/14/01   MORGAN

0419PM     5 N AKRON                 CO   1.25 INCH HAIL
09/14/01   WASHINGTON

0425PM     2 S AKRON                 CO   0.78 INCH HAIL
09/14/01   WASHINGTON

RAY

Local storm report, Sep 14, 5:15 PM MDT, 12 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
515 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

0312PM     10 E NEW RAYMER           CO   0.75 INCH HAIL
09/14/01   WELD

0351PM     1 NE HILLROSE             CO   1.00 INCH HAIL
09/14/01   MORGAN

0419PM     5 N AKRON                 CO   1.25 INCH HAIL
09/14/01   WASHINGTON

0425PM     2 S AKRON                 CO   0.78 INCH HAIL
09/14/01   WASHINGTON

0505PM     ELBA                      CO   0.78 INCH HAIL
09/14/01   WASHINGTON

RAY

Local storm report, Sep 14, 5:15 PM MDT, 12 minutes before

LOCAL STORM REPORT...CORR
NATIONAL WEATHER SERVICE DENVER CO
515 PM MDT FRI SEP 14 2001

...PRELIMINARY STORM REPORT FOR SEPTEMBER 14 2001...

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

0258 PM    5 N NEW RAYMER            CO   0.75 INCH HAIL
09/14/01   WELD

0312PM     10 E NEW RAYMER           CO   0.75 INCH HAIL
09/14/01   WELD

0351PM     1 NE HILLROSE             CO   1.00 INCH HAIL
09/14/01   MORGAN

0419PM     5 N AKRON                 CO   1.25 INCH HAIL
09/14/01   WASHINGTON

0425PM     2 S AKRON                 CO   0.88 INCH HAIL
09/14/01   WASHINGTON

0505PM     ELBA                      CO   0.88 INCH HAIL
09/14/01   WASHINGTON

RAY

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 14, 2:51 PM MDT	Severe Thunderstorm Warning	BOU	Weld	29 min
Sep 14, 3:08 PM MDT	Tornado Warning	BOU	Logan, Morgan	32 min
Sep 14, 3:43 PM MDT	Tornado Warning	BOU	Morgan, Washington	32 min
Sep 14, 4:16 PM MDT	Severe Thunderstorm Warning	BOU	Washington	29 min
Sep 14, 4:44 PM MDT	Severe Thunderstorm Warning	BOU	Washington	31 min

Nearby

Severe Thunderstorm Warnings in Colorado, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.