COMET CASE STUDY 037 "Tropical Storm Allison" Now Freely Available

• To: casestudies@xxxxxxxxxxxxxxxx, sootalk@xxxxxxxxxxxxxx,
• Subject: COMET CASE STUDY 037 "Tropical Storm Allison" Now Freely Available
• From: Yuan Ho <yuanho@xxxxxxxx>
• Date: Tue, 12 Feb 2002 16:02:02 -0700

Hello All:

                                                      --------COMET
CASE STUDY 037--TROPICAL STORM ALLISON---------


                       (06-19 June, 2001)


Summary

Allison spent 5 days over Southeast and East Texas and dumped record
amounts of rainfall across the area. Nearly 37 inches of rain was
recorded at the Port of Houston during this time. Damage estimates in
Harris County alone (includes the Houston Metro area) surpassed $4.88
billion. Allison will likely go down as the costliest tropical storm to
ever effect the United States. On the morning of June 11, 2001, Tropical
Storm Allison was moving into the marshes/bayous of southeast Louisiana.
The maximum amounts of rainfall occurred in the Vermilion and
Atchafalaya basins of south central Louisiana that saw heavy rains each
day from the 5th through the 11th. The highest amount reported from
Louisiana was 27.55 inches at salt point in St. Mary parish. On the
11th, the low that was once Tropical Storm Allison developed over land,
which had never happened before. This was mainly due to a jet streak
riding along the subtropical jet to its north and northeast enhancing
its outflow, which in turn led to a stronger surface low. As it edged
farther inland that afternoon, it finally weakened and lost the
eye.Allison tracked out of Mississippi into southern Alabama on the
afternoon on the 11th. Severe weather broke out in Georgia, South
Carolina, and southern North Carolina on the 13th and 14th. As the
system slowed in North Carolina,flooding became a major problem. As the
remnants of Tropical Storm Allisonmoved north-northwest along the
eastern edge of the DelmarvaPeninsula, a cold front moved in from the
west. This allowed moisture from Allison to pool along the front.
Southeast Pennsylvania saw torrents of rain during the afternoon and
evening of June 16th. Ultimately, Willow Grove Naval Air Station
received 10.16 inched while Chanfont recorded 10.17 inched for the
24-hour period ending the morning of the 17th. One June 18th, the last
of the rain associated with Allison left eastern Maine during the early
morning.

Objectives

This case provides the opportunity to study the life cycle of a tropical
cyclone after landfall.



                ------ORDERING------

To order case study 037 data, please go to:

     http://www.joss.ucar.edu/cgi-bin/codiac/projs?COMET_CASE_037




     ----ADDITIONAL RESOURCES----

For a detailed description of case study 037 and other training support
documentation, see COMET Case Study 037 at:

     http://www.comet.ucar.edu/resources/cases/c37_06jun2001/index.htm

Additional case studies and other case studies handling this type of
event can be found at:

     http://www.unidata.ucar.edu/projects/casestudies/ofInterest/

To view other projects included in JOSS's CODIAC system visit:

     http://www.joss.ucar.edu/cgi-bin/codiac/projs


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-Yuan

Yuan Ho
yuanho@xxxxxxxx
Unidata Support

--------------
Jeff Weber
jweber@xxxxxxxx
Unidata Support
________
Liz Page
NWS/OCWWS Case Study Meteorologist
epage@xxxxxxxx